Diagram sections — 21 (130 total)
ANTI-LOCK BRAKES COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER WINDOWS RADIO STARTING/CHARGING TRANSMISSION WARNING SYSTEMS WIPER/WASHER
ANTI-LOCK BRAKES All-Wheel ABS Wiring Diagram, with DRL for Chevrolet Cab & Chassis C1994 2500 List of elements for All-Wheel ABS Wiring Diagram, with DRL for Chevrolet Cab & Chassis C1994 2500: 42 (on master brake Abs ind Anti- lock ind Anti-lock module (4wal) (left front of cowl on brake master cylinder) Batt Brake fuse 15a Brake ind Brake pressure Brake sw Brake warn ind Bround C10 Cruise control system Cylinder) Data link connector (under left side of i/p) Daytime running lights module (under left side of i/p) Diode (behind left side of i/p) Dlc Ecm-ign fuse 10a Fuse block G117 (right rear of engine) Gages fuse 20a Ground Hot at all times Hot in run Hot in start or run Ign feed Ignition switch Instrument cluster Left fnt sens hi Left fnt sens lo Left front wheel sensor Park brake switch (on park brake assembly) Red Right front wheel sensor Rt fnt sens hi Rt fnt sens lo Tan Tcc brake switch (on brake pedal support arm) Vehicle speed sensor buffer (behind instrument panel on right side of steering column) Vss buffer input Warning lamp warning All-Wheel ABS Wiring Diagram, without DRL for Chevrolet Cab & Chassis C1994 2500 List of elements for All-Wheel ABS Wiring Diagram, without DRL for Chevrolet Cab & Chassis C1994 2500: 41 (on master brake Abs ind Anti- lock ind Anti-lock module (4wal) (left front of cowl on brake master cylinder) Batt Brake fuse 15a Brake ind Brake pressure Brake sw Brake warn ind Bround C10 Cruise control system Cylinder) Data link connector (under left side of i/p) Diode (left side cowl) Dlc Ecm-ign fuse 10a Fuse block G117 (right rear of engine) Gages fuse 20a Ground Hot at all times Hot in run Hot in start or run Ign feed Instrument cluster Left fnt sens hi Left fnt sens lo Left front wheel sensor Park brake switch (on park brake assembly) Red Right front wheel sensor Rt fnt sens hi Rt fnt sens lo Tan Tcc brake switch (on brake pedal support arm) Trunk, tailgate system (liftgate window release relay) Vehicle speed sensor buffer (behind instrument panel on right side of steering column) Vss buffer input Warning lamp warning Rear ABS Wiring Diagram, with DRL for Chevrolet Cab & Chassis C1994 2500 List of elements for Rear ABS Wiring Diagram, with DRL for Chevrolet Cab & Chassis C1994 2500: 39 12v batt 12v ign Anti-lock brake valve (left side of engine compartment) Brake fuse 15a Brake ind Brake pressure warning switch (below master cylinder) Brake sw C10 Data link connector (under left side of i/p) Daytime running lamps module (under left side of i/p) Diode Diode module (under left side of i/p) Dump sol E13 Ecm-ign fuse 10a Fuse block G106 (rear of right cylinder head) Gages fuse 20a Gnd Hot at all times Hot in run Hot in run, bulb test or start Hot in start or run Ignition switch Instrument cluster Instrument cluster (4wd ind) Iso sol Isolation sol Park brake warning switch (under left side of i/p) Powertrain control module (pcm) (under right end of instrument panel) Rear wheel anti-lock (rwal) module (left rear of engine (compartment) Reset Sol return Spd sig input Stop fuse 15a Tcc/stop lamp switch (top of brake pedal) Vehicle speed sensor buffer (behind i/p on right side of steering column) Vlv reset Warning lp Rear ABS Wiring Diagram, without DRL for Chevrolet Cab & Chassis C1994 2500 List of elements for Rear ABS Wiring Diagram, without DRL for Chevrolet Cab & Chassis C1994 2500: 39 (left side of engine compartment) 12v batt 12v ign Anti-lock brake valve Brake fuse 15a Brake ind Brake pressure warning switch (below master cylinder) Brake sw C10 Data link connector (under left side of i/p) Diode (in diode module) Diode module (under left side of i/p) Dump sol E13 Ecm-ign fuse 10a Fuse block G106 (rear of right cylinder head) Gages fuse 20a Gnd Hot at all times Hot in run Hot in run, bulb test or start Hot in start or run Instrument cluster Instrument cluster system (4wd ind) Iso sol Isolation sol Park brake warning switch (mounted on park brake) Powertrain control module (pcm) (under right ind of instrument panel) Rear wheel anti-lock (rwal) module (left rear of engine (compartment) Reset Sol return Spd sig input Stop fuse 15a Tcc/stop lamp switch (top of brake pedal) Trunk, tailgate system (endgate window release relay) Vehicle speed sensor buffer (behind i/p on right side of steering column) Vlv reset Warning lp
COMPUTER DATA LINES
4.3L 4.3L (VIN Z), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A14 diagnostic test c218 C159 C272 Data link connector F9 serial data c215 Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request
5.0L 5.0L (VIN H), Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A14 diagnostic test c218 C159 C272 Data link connector F9 serial data c215 Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request 5.0L (VIN H), Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A8 serial data A9 diagnostic test c216 C159 C272 Data link connector Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request
5.7L 5.7L (VIN K) HD, Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K) HD, Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A14 diagnostic test c218 C159 C272 Data link connector F9 serial data c215 Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request 5.7L (VIN K) HD, Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K) HD, Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A8 serial data A9 diagnostic test c216 C159 C272 Data link connector Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request 5.7L (VIN K), Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Data Link Connector Wiring Diagram, A/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A14 diagnostic test c218 C159 C272 Data link connector F9 serial data c215 Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request 5.7L (VIN K), Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Data Link Connector Wiring Diagram, M/T for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A8 serial data A9 diagnostic test c216 C159 C272 Data link connector Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request
6.5L 6.5L (VIN F), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 23 (below left side of i/p) (top right rear of engine) (under right 4-wheel abs A12 diagnostic test c217a C14 serial data c216 C159 C272 Data link connector End of i/p) Four-wheel anti-lock brake module (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G117 Powertrain control module (under right end of i/p) Rear wheel abs Red Rwal module vehicle (left rear engine compt) Speed input Speed output Vehicle Vehicle speed sensor buffer 6.5L (VIN P), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 23 (below left side of i/p) (top right rear of engine) (under right 4-wheel abs A12 diagnostic test c217a C14 serial data c216 C159 C272 Data link connector End of i/p) Four-wheel anti-lock brake module (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G117 Powertrain control module (under right end of i/p) Rear wheel abs Red Rwal module vehicle (left rear engine compt) Speed input Speed output Vehicle Vehicle speed sensor buffer 6.5L (VIN S), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 23 (below left side of i/p) (top right rear of engine) (under right 4-wheel abs A12 diagnostic test c217a C14 serial data c216 C159 C272 Data link connector End of i/p) Four-wheel anti-lock brake module (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G117 Powertrain control module (under right end of i/p) Rear wheel abs Red Rwal module vehicle (left rear engine compt) Speed input Speed output Vehicle Vehicle speed sensor buffer
7.4L 7.4L (VIN N), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Data Link Connector Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 15 (below left side of i/p) (left front top of engine) A14 diagnostic test c218 C159 C272 Data link connector F9 serial data c215 Four-wheel anti-lock brake module diagnostic (near master cylinder) Fuel pump Fuel pump prime Fuel pump relay (right rear of engine compt, near battery junction) G110 Powertrain control module (under right end of i/p) Red Request
CRUISE CONTROL
4.3L 4.3L (VIN Z), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 62 (4.3l vin z & 5.7l & 5.7l hd v8 vin k) (at top of (at top of brake (at top of clutch (behind right side of instrument panel) (under left side (under left side of 12vdc ign B10 Brake fuse 15a Brake pedal) C12 C227a C229 C286 C289 C290 Clutch switch Compartment) Convenience center Cruise control brake switch Cruise control module (left rear side of engine Cruise control switch Cruise input Cruise on input Cruise release Ecm-ign fuse 10a Fuse block G110 (top left front of engine) G125 (top front center of engine) Gauges fuse 20a Ground Hot at all times Hot in run Hot in run, bulb test or start Instrument panel) N/0 N/c Nca Of instrument Off Panel) Pcm signal Pedal) Power distri- bution Powertrain control module (pcm) R/a R/a signal S/c S/c signal Servo posit input Solid state Speed sensor input Stop fuse 15a Stop lp sw input System Tan Tcc/ stoplamp switch Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (behind upper right side of instrument panel) With manual transaxle Without manual transaxle
5.0L 5.0L (VIN H), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 62 (4.3l vin z & 5.7l & 5.7l hd v8 vin k) (at top of (at top of brake (at top of clutch (behind right side of instrument panel) (under left side (under left side of 12vdc ign B10 Brake fuse 15a Brake pedal) C12 C227a C229 C286 C289 C290 Clutch switch Compartment) Convenience center Cruise control brake switch Cruise control module (left rear side of engine Cruise control switch Cruise input Cruise on input Cruise release Ecm-ign fuse 10a Fuse block G110 (top left front of engine) G125 (top front center of engine) Gauges fuse 20a Ground Hot at all times Hot in run Hot in run, bulb test or start Instrument panel) N/0 N/c Nca Of instrument Off Panel) Pcm signal Pedal) Power distri- bution Powertrain control module (pcm) R/a R/a signal S/c S/c signal Servo posit input Solid state Speed sensor input Stop fuse 15a Stop lp sw input System Tan Tcc/ stoplamp switch Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (behind upper right side of instrument panel) With manual transaxle Without manual transaxle
5.7L 5.7L (VIN K), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 62 (4.3l vin z & 5.7l & 5.7l hd v8 vin k) (at top of (at top of brake (at top of clutch (behind right side of instrument panel) (under left side (under left side of 12vdc ign B10 Brake fuse 15a Brake pedal) C12 C227a C229 C286 C289 C290 Clutch switch Compartment) Convenience center Cruise control brake switch Cruise control module (left rear side of engine Cruise control switch Cruise input Cruise on input Cruise release Ecm-ign fuse 10a Fuse block G110 (top left front of engine) G125 (top front center of engine) Gauges fuse 20a Ground Hot at all times Hot in run Hot in run, bulb test or start Instrument panel) N/0 N/c Nca Of instrument Off Panel) Pcm signal Pedal) Power distri- bution Powertrain control module (pcm) R/a R/a signal S/c S/c signal Servo posit input Solid state Speed sensor input Stop fuse 15a Stop lp sw input System Tan Tcc/ stoplamp switch Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (behind upper right side of instrument panel) With manual transaxle Without manual transaxle
6.5L 6.5L (VIN F), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 44 (behind right side of instrument panel) (on brake pedal support bracket) (rear of right cylinder head) 15a 3 mode cruise A/t Anti-lock brake system Brake fuse C13 C215 C216 c15 C217a C226a C227a C271 C289 Clutch or (brake sw) input Clutch pedal position switch (on clutch pedal support bracket) Cruise cont sw-engage Cruise cont sw-retard Cruise control activator switch D11 D15 Ecm -ign fuse 10a Engage Fuse block G117 Gauges fuse 20a Ground Hot in run Hot in run, bulb Hot in start or run Ignition M/t Off Pickup Powertrain control module (pcm) (behind right side of instrument panel) Retard Tcc/brake switch Test or start Vehicle speed input Vehicle speed sensor buffer Vss output Yukon& suburban 6.5L (VIN P), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 44 (behind right side of instrument panel) (on brake pedal support bracket) (rear of right cylinder head) 15a 3 mode cruise A/t Anti-lock brake system Brake fuse C13 C215 C216 c15 C217a C226a C227a C271 C289 Clutch or (brake sw) input Clutch pedal position switch (on clutch pedal support bracket) Cruise cont sw-engage Cruise cont sw-retard Cruise control activator switch D11 D15 Ecm -ign fuse 10a Engage Fuse block G117 Gauges fuse 20a Ground Hot in run Hot in run, bulb Hot in start or run Ignition M/t Off Pickup Powertrain control module (pcm) (behind right side of instrument panel) Retard Tcc/brake switch Test or start Vehicle speed input Vehicle speed sensor buffer Vss output Yukon& suburban 6.5L (VIN S), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 44 (behind right side of instrument panel) (on brake pedal support bracket) (rear of right cylinder head) 15a 3 mode cruise A/t Anti-lock brake system Brake fuse C13 C215 C216 c15 C217a C226a C227a C271 C289 Clutch or (brake sw) input Clutch pedal position switch (on clutch pedal support bracket) Cruise cont sw-engage Cruise cont sw-retard Cruise control activator switch D11 D15 Ecm -ign fuse 10a Engage Fuse block G117 Gauges fuse 20a Ground Hot in run Hot in run, bulb Hot in start or run Ignition M/t Off Pickup Powertrain control module (pcm) (behind right side of instrument panel) Retard Tcc/brake switch Test or start Vehicle speed input Vehicle speed sensor buffer Vss output Yukon& suburban
7.4L 7.4L (VIN N), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Cruise Control Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 62 (4.3l vin z & 5.7l & 5.7l hd v8 vin k) (at top of (at top of brake (at top of clutch (behind right side of instrument panel) (under left side (under left side of 12vdc ign B10 Brake fuse 15a Brake pedal) C12 C227a C229 C286 C289 C290 Clutch switch Compartment) Convenience center Cruise control brake switch Cruise control module (left rear side of engine Cruise control switch Cruise input Cruise on input Cruise release Ecm-ign fuse 10a Fuse block G110 (top left front of engine) G125 (top front center of engine) Gauges fuse 20a Ground Hot at all times Hot in run Hot in run, bulb test or start Instrument panel) N/0 N/c Nca Of instrument Off Panel) Pcm signal Pedal) Power distri- bution Powertrain control module (pcm) R/a R/a signal S/c S/c signal Servo posit input Solid state Speed sensor input Stop fuse 15a Stop lp sw input System Tan Tcc/ stoplamp switch Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (behind upper right side of instrument panel) With manual transaxle Without manual transaxle
DEFOGGERS Defogger Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Defogger Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 23 (at dlc (at right b-pillar) (at right c-pillar) (ext and crew cab) (reg cab) Acc/bat circuit breaker 30a Connector) Convenience center (under left side of i/p) Fuse block G206 G305 G905 Gauges fuse 20a Hot at all times Hot in run, bulb test or start Hot with headlight switch in park or head Nca Off On indicator Panel lamps Pnl lps fuse 5a Rear defogger grid Rear defogger switch
ENGINE PERFORMANCE
4.3L 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 28 (4.3l only) (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (4.3l only) (rear of engine) Knock sensor (right side of engine, below exhaust manifold) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Red Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 45 (4l60e (4l60e) t (4l80e) s 3-2 shift solenoid (4l60e only) 4.3l all or w/ nrq 4wd fuse 25a All C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Electronic 4-speed automatic overdrive transmission Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) G117 (rear of right cylinder head) Heated oxygen sensor (in exhaust y-pipe) Hot at all times Hot in run Hot in run or start Instrument Oil press in Only) Other Pnk Pressure control solenoid Range mode selector Red Shift sole- noid 1-2 Shift solenoid 2-3 Tach in Tan Torque converter clutch solenoid Trans fuse 10a Trans- mission temp sensor Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in W/ 4l60e W/ 4l80e 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500: 88 (4.3l only) (7.4l only) (left top front 12v battery 12v ignition 5v return a 5v return b 5v sensor ref A/c on signal in A10 A11 A12 A13 A14 A15 A16 Air conditioning system B10 B11 B12 B13 B14 B15 B16 Brake sw to pcm C215 C218 Coolant temp sensor Cruise control system Cruise ind reg grd Distributor ref hi Distributor ref lo Dlc Dlc serial data E10 E11 E12 E13 E14 E15 E16 Ecm-ign fuse 10a Egr valve solenoid Egr valve solenoid (4.3l only) (left rear top of engine) Elec fuel pump in Engine control module (under right side of i/p) Evap canister purge ctrl Evaporative canister purge solenoid (on engine) F10 F11 F12 F13 F14 F15 F16 Fuel pump relay ctrl Fuse block G110 Hot in run Hot in run, bulb Idle air control unit (right rear of tbi unit) Ignition bypass Ignition control (ic) Inj fuse 10a Knock sensor in Linear egr position in Lo side inj a Lo side inj b Map sensor in Mil indicator ctrl Of engine) Or start Oxygen sensor hi Oxygen sensor lo Red Stepper coil a hi Stepper coil a lo Stepper coil b hi Stepper coil b lo System ground Tan Test, or start Throttle actuator ctrl Throttle body fuel injector #1 (top of throttle body unit) Throttle body fuel injector #2 (top of throttle body unit) Throttle position sensor in Upshift ind ctrl Vss buffer signal 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 29 (4.3l only) (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (4.3l only) (rear of engine) Knock sensor (right side of engine, below exhaust manifold) Linear egr regulator solenoid valve (7.4l only) (right top of engine) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) Up- shift indic- ator 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 30 (4.3l only) (4.3l) (7.4l) 4wd fuse 25a C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) G117 (rear of right cylinder head) Heated oxygen sensor (4.3l) (in exhaust y-pipe) Hot at all times Hot in run Instrument Oil press in Oxygen sensor (7.4l) (left exhaust manifold) Red Tach in Tan Throttle actuator solenoid (7.4l only) (on throttle body unit) Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in
5.0L 5.0L (VIN H), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 28 (4.3l only) (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (4.3l only) (rear of engine) Knock sensor (right side of engine, below exhaust manifold) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Red Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) 5.0L (VIN H), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 45 (4l60e (4l60e) t (4l80e) s 3-2 shift solenoid (4l60e only) 4.3l all or w/ nrq 4wd fuse 25a All C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Electronic 4-speed automatic overdrive transmission Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) G117 (rear of right cylinder head) Heated oxygen sensor (in exhaust y-pipe) Hot at all times Hot in run Hot in run or start Instrument Oil press in Only) Other Pnk Pressure control solenoid Range mode selector Red Shift sole- noid 1-2 Shift solenoid 2-3 Tach in Tan Torque converter clutch solenoid Trans fuse 10a Trans- mission temp sensor Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in W/ 4l60e W/ 4l80e 5.0L (VIN H), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500: 79 (5.7l hd only) (a/c compressor clutch) 12v battery 12v ignition 5v sensor ref A/c on signal in A10 A11 A12 Air conditioning system Air switch solenoid Air switch solenoid (5.0l & 5.7l- pickup only) (right front of engine) Anti-lock brake system B10 B11 B12 C10 C11 C12 C13 C14 C15 C16 C216 Coolant temp sens sig Crank fuse 5a Crank signal D10 D11 D12 D13 D14 D15 D16 Data link connector (under left side of i/p) Distributor ref hi Distributor ref lo Dlc diagnostic test Dlc serial data Ecm-ign fuse 10a Egr solenoid Engine control module (under right side of i/p) Exhaust gas recirculation solenoid (5.0l & 5.7l ld only) (left rear top of engine) Fuel pump relay ctrl Fuel pump signal input Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Hot in start Iac coil a hi Iac coil a lo Iac coil b hi Iac coil b lo Ic bypass Idle air control unit (right rear of tbi unit) Ignition control (ic) Inj fuse 10a Injector 1 driver Injector 2 driver Instrument cluster Map 5v sensor ground Map sensor signal Mil indicator ctrl Oxygen sensor (left side exhaust manifold) Oxygen sensor ground Oxygen sensor signal Red Sensor return ground Service engine soon indicator Spark retard signal System ground Tan Throttle body fuel injector #1 (top of throttle body unit) Throttle body fuel injector #2 (top of throttle body unit) Tp sensor signal Up- shift lamp Upshift lamp ctrl Vss buffer signal 5.0L (VIN H), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 38 (center rear Accy Bulb test C12 C14 C15 Distributor Egr elec- tronic vacuum regulator solenoid (5.7l hd only) (right top of engine) Engine coolant temperature sensor (right top front of engine) Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) G110 (left top front of engine) G125 (top front center of engine) Hot at all times Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (right side of engine, below exhaust manifold) Knock sensor module (above right side rocker cover) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Oil press in Pnk Red Run Start Tach in Tachometer test lead Tan Throttle position sensor (right side of throttle body) Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right side end of i/p) Vss in
5.7L 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 28 (4.3l only) (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (4.3l only) (rear of engine) Knock sensor (right side of engine, below exhaust manifold) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Red Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 45 (4l60e (4l60e) t (4l80e) s 3-2 shift solenoid (4l60e only) 4.3l all or w/ nrq 4wd fuse 25a All C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Electronic 4-speed automatic overdrive transmission Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) G117 (rear of right cylinder head) Heated oxygen sensor (in exhaust y-pipe) Hot at all times Hot in run Hot in run or start Instrument Oil press in Only) Other Pnk Pressure control solenoid Range mode selector Red Shift sole- noid 1-2 Shift solenoid 2-3 Tach in Tan Torque converter clutch solenoid Trans fuse 10a Trans- mission temp sensor Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in W/ 4l60e W/ 4l80e 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500: 79 (5.7l hd only) (a/c compressor clutch) 12v battery 12v ignition 5v sensor ref A/c on signal in A10 A11 A12 Air conditioning system Air switch solenoid Air switch solenoid (5.0l & 5.7l- pickup only) (right front of engine) Anti-lock brake system B10 B11 B12 C10 C11 C12 C13 C14 C15 C16 C216 Coolant temp sens sig Crank fuse 5a Crank signal D10 D11 D12 D13 D14 D15 D16 Data link connector (under left side of i/p) Distributor ref hi Distributor ref lo Dlc diagnostic test Dlc serial data Ecm-ign fuse 10a Egr solenoid Engine control module (under right side of i/p) Exhaust gas recirculation solenoid (5.0l & 5.7l ld only) (left rear top of engine) Fuel pump relay ctrl Fuel pump signal input Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Hot in start Iac coil a hi Iac coil a lo Iac coil b hi Iac coil b lo Ic bypass Idle air control unit (right rear of tbi unit) Ignition control (ic) Inj fuse 10a Injector 1 driver Injector 2 driver Instrument cluster Map 5v sensor ground Map sensor signal Mil indicator ctrl Oxygen sensor (left side exhaust manifold) Oxygen sensor ground Oxygen sensor signal Red Sensor return ground Service engine soon indicator Spark retard signal System ground Tan Throttle body fuel injector #1 (top of throttle body unit) Throttle body fuel injector #2 (top of throttle body unit) Tp sensor signal Up- shift lamp Upshift lamp ctrl Vss buffer signal 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 38 (center rear Accy Bulb test C12 C14 C15 Distributor Egr elec- tronic vacuum regulator solenoid (5.7l hd only) (right top of engine) Engine coolant temperature sensor (right top front of engine) Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) G110 (left top front of engine) G125 (top front center of engine) Hot at all times Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (right side of engine, below exhaust manifold) Knock sensor module (above right side rocker cover) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Oil press in Pnk Red Run Start Tach in Tachometer test lead Tan Throttle position sensor (right side of throttle body) Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right side end of i/p) Vss in
6.5L 6.5L (VIN F), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 74 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 2-3 shift sol ctrl 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN F), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 73 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN P), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 74 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 2-3 shift sol ctrl 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN P), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 73 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN P), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500: 97 4 wheel drive low switch 4wd fuse 25a 4wd low sw 5v ref Accelerator pedal position (app) module (top of accelerator bracket) Anti-lock brakes system App 1 sens 5v ref App 1 sens gnd App 1 sensor App 2 sens gnd App 2 sensor App 3 sens 5v ref App 3 sens gnd App 3 sensor App sens 1 sig App sens 2 sig Battery feed Boost sig C10 C11 C12 C13 C14 C15 C16 Ckp sig Closure gnd Clutch pedal position switch Conven- ience center Crk fuse 5a Cruise control system Cruise on/off sig D10 D11 D12 D13 D14 D15 D16 Data link connector (under left side of i/p) E10 E11 E12 E13 E14 E15 E16 Ect sig Egr ctrl/baro sig Egr sol ctrl Eng shut-off ctrl Engine coolant temperature (ect) sensor (right side of engine) Engine shut- off solenoid (top front of engine) F/sol fuse 20a F10 F11 F12 F13 F14 F15 F16 Fuel inj ctrl Fuel inj sig Fuel solenoid (top front of engine) Fuel solenoid driver (top front of engine) Fuse block G117 (top right rear of engine) Glow plug rly ctrl Hi resolution sig Hot at all times Hot in crank Hot in run Hot in start Mil Optical sens 5v ref Optical sens cam sig Optical sens gnd Optical sensor and fuel temper- ature sensor (top front of engine) Or run Pnk Powertrain control module (pcm) (under right end of i/p) Red Resume/accel sig Sensor gnd Serial data Set/coast sig Speed sensor (left rear side of transmission) System gnd Tan Tcc brake sw Trans fluid temp sig Trans output Trans output spd sig Vehicle speed sensor buffer (under right end of i/p) Vss Vss input Vss output 6.5L (VIN P), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 70 "service throttle" lamp 'service engine soon' lamp 'service throttle' lamp 'wait' lamp (upper rear of engine) 20a A/c sig A10 A11 A12 Air cond- itioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f only) (upper left C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p only) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) (left rear top of engine) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right side of safety wall) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 (rear of right cylinder head) G117 (top right rear of engine) G206 (under left side of i/p, near dlc) Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (vin f & s) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Side of cowl) Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Wastegate sol ctrl Wastegate solenoid (vin f only) (left rear top of engine) 6.5L (VIN S), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams, 4L60E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 74 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 2-3 shift sol ctrl 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN S), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams, 4L80E A/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 73 "service engine soon" lamp "service throttle" lamp (left rear top of engine) (rear of right cylinder head) (turbo only) (under left side of i/p, near dlc) (upper rear of engine) 20a A/c sig A10 A11 A12 Air conditioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f) (upper left side of cowl) C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right upper cowl) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 G117 (top right rear of engine) G206 Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (turbo only) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Vin p only Wait lamp Wastegate sol ctrl Wastegate solenoid (turbo only) (left rear top of engine) 6.5L (VIN S), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams, M/T (1 of 2) for Chevrolet Cab & Chassis C1994 2500: 97 4 wheel drive low switch 4wd fuse 25a 4wd low sw 5v ref Accelerator pedal position (app) module (top of accelerator bracket) Anti-lock brakes system App 1 sens 5v ref App 1 sens gnd App 1 sensor App 2 sens gnd App 2 sensor App 3 sens 5v ref App 3 sens gnd App 3 sensor App sens 1 sig App sens 2 sig Battery feed Boost sig C10 C11 C12 C13 C14 C15 C16 Ckp sig Closure gnd Clutch pedal position switch Conven- ience center Crk fuse 5a Cruise control system Cruise on/off sig D10 D11 D12 D13 D14 D15 D16 Data link connector (under left side of i/p) E10 E11 E12 E13 E14 E15 E16 Ect sig Egr ctrl/baro sig Egr sol ctrl Eng shut-off ctrl Engine coolant temperature (ect) sensor (right side of engine) Engine shut- off solenoid (top front of engine) F/sol fuse 20a F10 F11 F12 F13 F14 F15 F16 Fuel inj ctrl Fuel inj sig Fuel solenoid (top front of engine) Fuel solenoid driver (top front of engine) Fuse block G117 (top right rear of engine) Glow plug rly ctrl Hi resolution sig Hot at all times Hot in crank Hot in run Hot in start Mil Optical sens 5v ref Optical sens cam sig Optical sens gnd Optical sensor and fuel temper- ature sensor (top front of engine) Or run Pnk Powertrain control module (pcm) (under right end of i/p) Red Resume/accel sig Sensor gnd Serial data Set/coast sig Speed sensor (left rear side of transmission) System gnd Tan Tcc brake sw Trans fluid temp sig Trans output Trans output spd sig Vehicle speed sensor buffer (under right end of i/p) Vss Vss input Vss output 6.5L (VIN S), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Engine Performance Wiring Diagrams, M/T (2 of 2) for Chevrolet Cab & Chassis C1994 2500: 70 "service throttle" lamp 'service engine soon' lamp 'service throttle' lamp 'wait' lamp (upper rear of engine) 20a A/c sig A10 A11 A12 Air cond- itioning system App 2 sens 5v ref App 3 sens sig B/h B10 B11 B12 Baro sensor (vin f only) (upper left C red C203 Crankshaft position sensor (top front of engine, inside Cruise ctrl brake sig Diagnostic request Ecm-ign fuse 10a Egr control pressure/ baro sensor (vin p & s) (upper left side of cowl) Egr solenoid (vin p only) (left rear top of engine) Egr vent sol ctrl Egr vent solenoid (vin p & s) (left rear top of engine) Fuel heater (top rear of engine) Fuel pump in-line fuse Fuel pump oil pressure switch Fuel pump relay (right side of safety wall) Fuel pump/sender (in fuel tank) Fuel temp sig Fuse block Fusible link (12ga- Fusible links G117 (rear of right cylinder head) G117 (top right rear of engine) G206 (under left side of i/p, near dlc) Gauges fuse 20a Glo plug fuse 5a Glow plug control relay (right rear top of engine) Glow plug sig Hot at all times Hot in run, bulb test or start Hot in start or run Iat sig Ignition feed Injection pump) Injection timing stepper (its) motor (top front of engine) Instrument cluster Instrument clusters system Intake air temperature (iat) sensor (at front of engine) Its coil 1 hi Its coil 1 lo Its coil 2 hi Its coil 2 lo Left bank glow plugs Manifold absolute pressure sensor (vin f & s) (left rear engine compt, at cowl) Powertrain control module (pcm) (under right end of i/p) Red Right bank glow plugs Side of cowl) Sol fuse 5a Stop fuse 15a Tan Tcc/ brake switch (on brake pedal support bracket) Wastegate sol ctrl Wastegate solenoid (vin f only) (left rear top of engine)
7.4L 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500: 99 (left top front 12v battery 12v ignition 5v return a 5v return b 5v sensor ref A/c on signal in A10 A11 A12 A13 A14 A15 A16 Air condition- ing system B10 B11 B12 B13 B14 B15 B16 Brake sw to pcm C215 C218 Coolant temp sensor Cruise control system Cruise ind reg grd Distributor ref hi Distributor ref lo Dlc Dlc serial data E10 E11 E12 E13 E14 E15 E16 Ecm-ign fuse 10a Egr valve solenoid Elec fuel pump in Engine control module (under right side of i/p) Evap canister purge ctrl Evaporative canister purge solenoid (on engine) F10 F11 F12 F13 F14 F15 F16 Fuel pump relay ctrl Fuse block G110 G110 (left top front of engine) Hot in run Hot in run, bulb Idle air control unit (right rear of tbi unit) Ignition bypass Ignition control (ic) Inj fuse 10a Knock sensor in Linear egr position in Linear egr regulator solenoid valve (right top of engine) Lo side inj a Lo side inj b Map sensor in Mil indicator ctrl Of engine) Or start Oxygen sensor hi Oxygen sensor lo Pcm to trans temp sensor Pcm trans force mtr hi Pcm trans force mtr lo Pcm trans range a Pcm trans range b Pcm trans range c Pcm trans shift sol a Pcm trans shift sol b Pnk Red Stepper coil a hi Stepper coil a lo Stepper coil b hi Stepper coil b lo System ground Tan Tcc clutch ctrl Test, or start Throttle actuator sol ctrl Throttle body fuel injector #1 (top of throttle body unit) Throttle body fuel injector #2 (top of throttle body unit) Throttle position sensor in Trans input speed in hi Trans input speed in lo Transmission input shaft speed sensor (left side of trans- mission) Vss buffer signal 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 26 (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (right side of engine, below exhaust manifold) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Red Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 33 C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) Heavy duty electronic 4-speed automatic overdrive transmission Hot at all times Hot in run or start Instrument Oil press in Oxygen sensor (left exhaust manifold) Pnk Pressure control solenoid Range mode selector Red Shift solenoid 1-2 Shift solenoid 2-3 Tach in Tan Throttle actuator solenoid (on throttle body unit) Torque converter clutch solenoid Trans fuse 10a Trans- mission temp sensor Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (1 of 3) for Chevrolet Cab & Chassis C1994 2500: 88 (4.3l only) (7.4l only) (left top front 12v battery 12v ignition 5v return a 5v return b 5v sensor ref A/c on signal in A10 A11 A12 A13 A14 A15 A16 Air conditioning system B10 B11 B12 B13 B14 B15 B16 Brake sw to pcm C215 C218 Coolant temp sensor Cruise control system Cruise ind reg grd Distributor ref hi Distributor ref lo Dlc Dlc serial data E10 E11 E12 E13 E14 E15 E16 Ecm-ign fuse 10a Egr valve solenoid Egr valve solenoid (4.3l only) (left rear top of engine) Elec fuel pump in Engine control module (under right side of i/p) Evap canister purge ctrl Evaporative canister purge solenoid (on engine) F10 F11 F12 F13 F14 F15 F16 Fuel pump relay ctrl Fuse block G110 Hot in run Hot in run, bulb Idle air control unit (right rear of tbi unit) Ignition bypass Ignition control (ic) Inj fuse 10a Knock sensor in Linear egr position in Lo side inj a Lo side inj b Map sensor in Mil indicator ctrl Of engine) Or start Oxygen sensor hi Oxygen sensor lo Red Stepper coil a hi Stepper coil a lo Stepper coil b hi Stepper coil b lo System ground Tan Test, or start Throttle actuator ctrl Throttle body fuel injector #1 (top of throttle body unit) Throttle body fuel injector #2 (top of throttle body unit) Throttle position sensor in Upshift ind ctrl Vss buffer signal 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 29 (4.3l only) (center rear Accy Bulb test Distributor Engine coolant temperature sensor (right top front of engine) Fuse block Gauges fuse 20a Hot at all times Hot in run, bulb test, or start Ignition coil (center rear of engine) Ignition switch Instrument cluster Knock sensor (4.3l only) (rear of engine) Knock sensor (right side of engine, below exhaust manifold) Linear egr regulator solenoid valve (7.4l only) (right top of engine) Lock Manifold absolute pressure sensor (right rear top of engine) Nca Of engine) Off Pnk Run Service engine soon indicator Start Tachometer test lead Tcc/brake switch (top of brake pedal bracket) Throttle position sensor (right side of throttle body) Up- shift indic- ator 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, M/T (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 30 (4.3l only) (4.3l) (7.4l) 4wd fuse 25a C12 C13 C14 C15 Cluster Data link connector (under left side of i/p) Fuel pump and sender Fuel pump in-line fuse 20a Fuel pump oil pressure switch (left rear of engine, near exhaust manifold) Fuel pump relay (right rear of engine compartment, near battery junction block) Fuse block G110 (left top front of engine) G117 (rear of right cylinder head) Heated oxygen sensor (4.3l) (in exhaust y-pipe) Hot at all times Hot in run Instrument Oil press in Oxygen sensor (7.4l) (left exhaust manifold) Red Tach in Tan Throttle actuator solenoid (7.4l only) (on throttle body unit) Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vss in
EXTERIOR LIGHTS Exterior Lamps Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Exterior Lamps Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 84 (chassis cab) (in license lamp harness, behind left side of rear bumper) s403 (left side of engine compartment near headlamp) s105 (left side) (near center high mount stoplamp relay, at left side of eng compartment) (pickup) (right side) (taped to body near fuse block) 30a Auxiliary lead Backup a lamps Backup lamps switch (on top of steering column, a/t) (left top of transmission, m/t) Battery junction block (in engine compartment, right upper cowl) C203 C271 Center high mount stoplamp Center high mount stoplamp relay Chassis cab Convenience center (under left side of i/p) Crossmember) s426 Cruise control system Fuse block: i/p G101 (right inner fender, near battery) G106 (on sheet metal, above left headlamp) G110 (left top of engine) G117 (rear of right) cylinder head) G206 (under i/p) G409 (left rear frame rail) G409 (left side of platform hitch) (rear of left frame rail) Hazard Hazard flasher (under left side of i/p) Head Headlight switch assembly Heavy duty Hot at all times Hot in run, bulb test or start Inline fuse (near battery junction block) Instrument cluster Left backup lamp Left front marker lamp Left front park/turn lamps Left tail/stop/ turn lamp Left turn indicator License lamps Normal Off Park Park lps fuse 20a Pickup Pickup only Rear clearance lamps circuit (pickup w/ dual rear wheels) Red Right backup lamp Right front marker lamp Right front park/turn lamps Right tail/stop/ turn lamp Right turn indicator Roof marker lamps S103 S104 S118 S190 S207 S208 S210 (under left side of dash) S251 S275a (near center high mount stoplamp relay, at left side of eng compartment) S404 S406 (in trailer harness, at rear crossmember) S407 (in trailer harness, at rear crossmember) S420 (in trailer harness, at rear crossmember) S425 S425 (in rear lamp harness, at left side of rear crossmember) S427 (in rear lamp harness, at left side of rear crossmember) Stop fuse 15a Stoplamp switch (top of brake pedal) Terminates for auxiliary usage Trailer tow Turn left Turn right Turn signal flasher Turn-b/u fuse 15a Turn/hazard switch (upper left side of steering switch) W/ chassis cab only Rear Clearance Lamps Wiring Diagram, with Dual Rear Wheels for Chevrolet Cab & Chassis C1994 2500 List of elements for Rear Clearance Lamps Wiring Diagram, with Dual Rear Wheels for Chevrolet Cab & Chassis C1994 2500: 24 (in rear lamp harness, at left side of rear crossmember) s427 (in trailer wiring harness, at rear crossmember) s405 Endgate marker lamps Front marker & park/turn lamps Fuse block: i/p G409 (bottom center of endgate) G409 (left side of hitch, w/ platform hitch) (left frame rail, w/o platform hitch) Head Headlight switch assembly Hot at all times Left front clearance lamp Left rear clearance lamp Left rear fender Off Park Park lps fuse 20a Right front clearance lamp Right rear clearance lamp Right rear fender S208 S210 (behind left end of dash) S425 Tail/stop/turn & license lamps) Trailer tow
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for Ground Distribution Wiring Diagram (1 of 3) for Chevrolet Cab & Chassis C1994 2500: 59 (4.3l, 5.0l, 5.7l engines) (7.4l engine) (diesel engines) A/c high pressure switch Auxiliary cooling fan motor Auxilliary battery (gas engines) Battery (right) Body ground Crew cab, suburban & utility vehicles w/ auxilliary lighting Crew cab, suburban & utility vehicles w/ overhead console Daytime running lamps Engine ground Front dome & reading lamps Front left park and turn lamp Front right park and turn lamp G# n/a (near rear dome lamps) G# n/a (near front dome lamps) G# n/a (no location available) G101 (right inner fender, near battery) G101 (right inner fender, near battery) G106 (gasoline engines) (on sheet metal above left headlamp) G106 (on sheet metal, above left headlamp) G110 (diesel engines) (left top front of engine) G119 (front of right cylinder head) G119 (right front of engine) G119 (right front top of engine) G305 (pickup) (right "b" pillar) G905 (extended & crew cab) (at right "c" pillar) G909 (near front dome lamp) Headlights system Left battery (diesel engines) Left fog lamp Left high beam headlamp Left high/ low beam headlamp Left horn Left low beam headlamp Left snow- plow lamp, turn signal relay Nca Overhead roof console lamps Rear defogger grid (pickup) Rear dome & reading lamps Relay Right fog lamp Right high beam headlamp Right high/ low beam headlamp Right horn Right low beam headlamp Right park and turn lamp Right snow- plow lamp, turn signal relay To g206 Uncoated W/ daytime running lights W/ l19 gasoline engine and a/c W/ snowplow preparation package W/ v22 appearance package W/o daytime running lights W/o v22 appearance package Washer pump motor With v22 appearance package Ground Distribution Wiring Diagram (2 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for Ground Distribution Wiring Diagram (2 of 3) for Chevrolet Cab & Chassis C1994 2500: 81 (l05 only) w/ hd automatic transmission 4wal module 4wal pump motor A/c comp- ressor clutch A/c controller A/c high pressure cutout switch # 2 A12 All Ash tray lamps Audio alarm module Auxiliary battery relay Blower motor C103a C159 C208 C212 C228a C230a C244 C257 C287a C290 C86 Center Center high mount stoplamp (chmsl) Center high mount stoplamp relay Cigarette lighter assembly Convenience Convenience center Coolant level sensor Cruise control module Data link connector Daytime running lamps module Daytime running lamps relay Diode Egr electronic vacuum regulator solenoid valve Engine only Except drl Four- wheel drive indicator From left high (or high/low) beam headlamp Fuel heater Fuel pump and sender Fuel pump relay G110 (lb4, l19 engines) (left top front of engine) G110 (left top front of engine) G117 (rear of right cylinder head) G125 (l03, l05 engines) top front center of engine) G206 (at data link connector) Glow plug control module Gra Ground bus Heated oxygen sensor I/p comp- artment box lamp Instrument cluster Lb4, l03, l05, l19 gasoline engines w/ automatic transmission lb4, l19 gasoline engines w/ manual transmission Left door jamb switch Low coolant warning lamp module Nca Panel dimmer switch (assembly) Park/ neutral position switch Pickup only Power locks power windows Power seat Powertrain control module (pcm) Radio Rear auxilliary heater control Rear defogger switch Rear washer pump motor Rear wiper/ washer switch Right door jamb switch Roof marker lamps Rwal module Safety belt retractor switch Suburban & utility only Tan Turn flasher Vehicle speed sensor buffer W/ diesel engines only W/ lb4, l03 & l05 engines Water- in- fuel sensor Wiper motor and module (front) Ground Distribution Wiring Diagram (3 of 3) for Chevrolet Cab & Chassis C1994 2500 List of elements for Ground Distribution Wiring Diagram (3 of 3) for Chevrolet Cab & Chassis C1994 2500: 78 (at left rear of frame rail) (at left side of hitch) (at rear of left frame rail) (bottom center of endgate) (l05 engine w/hd automatic transmission) (top front center of engine) (vin k) (w/ manual transmission) (w/ platform hitch) (w/o platform hitch) (w/o platform hitch) (at left rear of frame rail) A12 Auxilliary air condi- tioning (or heater and air conditioning) control (front) Auxilliary air condi- tioning (or heater and air conditioning) control (rear) Auxilliary heater and air conditioning logic module Blower motor (rear) Center high mount stoplamp Chassis cab Convenience center Data link connector Endgate Endgate clearance lamps Evrv electronic vacuum regulator valve solenoid Fuel pump Fuel pump relay G110 (left top front of engine) G117 (top right rear of engine) G125 G409 G409 (at left rear of frame rail) G409 (at left side of hitch) G409 (w/ platform hitch) G409 (w/o platform hitch) G998 (at right "d" pillar) Heavy duty trailer wiring u89 Hot fuel handling module Knock sensor module L03, l05 gasoline engines w/ manual transmission L49, l56 & l65 diesel engines w/ manual transmission Left cargo door defogger grid Left door contact switch Left front clearance lamp Left license lamp Left rear clearance lamp Left rear fender Left rear tail, stop, license, turn and backup lamps Left rear tail, stop, turn and backup lamps Left tail/ stop, turn and backup lamp Liftgate window release solenoid Mode door motor Orn Park/ neutral position switch Pickup (w/o dual rear wheels), suburban and utility Pickup with dual rear wheels Powertrain control module (pcm) Rear door jamb switch Rear endgate window defogger grid Rear wiper motor module Right cargo door defogger grid Right door contact switch Right front clearance lamp Right gas strut cylinder Right license lamp Right rear clearance lamp Right rear fender Right rear tail, stop, license, turn and backup lamps Right rear tail, stop, turn and backup lamps Right tail/ stop, turn and backup lamp Suburban & utility Suburban & utility non-base vehicle Suburban & utility w/ automatic transmissions Tan Temper- ature door motor Temper- ature mode door relay Trailer Vehicle speed sensor buffer W/ auxilliary heater & air conditioning W/ rear auxilliary heater only With endgate
HEADLIGHTS Headlamps Wiring Diagram, DRL with Composite Lamps for Chevrolet Cab & Chassis C1994 2500 List of elements for Headlamps Wiring Diagram, DRL with Composite Lamps for Chevrolet Cab & Chassis C1994 2500: 35 (at park brake, under left side of i/p) Bulb check Daytime running lamp indicator Daytime running lamps module (behind left side of i/p) Daytime running lamps relay (engine compartment front plenum panel) Drl fuse 15a Fuse block G101 (right inner fender, near battery) G106 (on sheet metal, above left headlamp) G206 (at dlc connector) Gauges fuse 20a Ground Head Headlamp dimmer switch Headlight switch assembly Hi beam feed Hi beam indicator Hot at all times Hot in run Hot in run, bulb test or start Htr-a/c fuse 25a Ignition Instrument cluster Lamp feed Left high beam headlamp Left low beam headlamp Off Output to relay Park Park brake warning switch Pickup only Right high beam headlamp Right low beam headlamp Suburban/ utility only Tan Headlamps Wiring Diagram, DRL with Sealed Beam Lamps for Chevrolet Cab & Chassis C1994 2500 List of elements for Headlamps Wiring Diagram, DRL with Sealed Beam Lamps for Chevrolet Cab & Chassis C1994 2500: 33 (at park brake, under left side of i/p) Bulb check Daytime running lamp indicator Daytime running lamps module (behind left side of i/p) Daytime running lamps relay (engine compartment front plenum panel) Drl fuse 15a Fuse block G106 (on sheet metal above left headlamp) G107 (on radiator support, behind right headlamp) G206 (at dlc connector) Gauges fuse 20a Ground Head Headlamp dimmer switch Headlight switch assembly Hi beam feed Hi beam indicator Hot at all times Hot in run Hot in run, bulb test or start Htr-a/c fuse 25a Ignition Instrument cluster Lamp feed Left headlamp assembly Off Output to relay Park Park brake warning switch Pickup only Right headlamp assembly Suburban/ utility only Tan Headlamps Wiring Diagram, with Sealed Beam Lamps for Chevrolet Cab & Chassis C1994 2500 List of elements for Headlamps Wiring Diagram, with Sealed Beam Lamps for Chevrolet Cab & Chassis C1994 2500: 13 G117 (right inner fender near battery) G206 (at dcl connector) Head Headlamp dimmer switch Headlight switch assembly Hi beam indicator Hot at all times Instrument cluster Left headlamp assembly Off Park Right headlamp assembly Tan Headlamps/Fog Lamps Wiring Diagram, with Composite Lamps for Chevrolet Cab & Chassis C1994 2500 List of elements for Headlamps/Fog Lamps Wiring Diagram, with Composite Lamps for Chevrolet Cab & Chassis C1994 2500: 35 (on sheet metal (right inner Above left headlamp) Acc-batt circuit breaker 30a Battery) Convenience center (under left side of i/p) Fender, near Fog lamp on indicator Fog lamp relay (behind left side of i/p) Fog lamp switch Fuse block G101 G101 (right inner fender, near battery) G106 G106 (on sheet metal above left headlamp) G206 (at dcl connector) Head Headlamp dimmer switch Headlight switch assembly Hi beam indicator Hot at all times Illum lamp Instrument cluster Left fog lamp Left high beam head- lamp Left low beam head- lamp Off Park Pnl lps fuse 5a Right fog lamp Right high beam head- lamp Right low beam head- lamp Solid state switch Tan Variable voltage w/ headlight switch in park or head & rheostat adjusted
HORN Horn Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Horn Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 14 (on sheet metal, (right inner Convenience center (under left side of i/p) Fuse block G100 above left headlamp) G101 fender, near battery) Horn relay Horn switch Hot at all times Left horn (at front of vehicle) Park lps fuse 20a Right horn (at front of vehicle) Steering wheel W/v22 only
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram, Gasoline for Chevrolet Cab & Chassis C1994 2500 List of elements for Instrument Cluster Wiring Diagram, Gasoline for Chevrolet Cab & Chassis C1994 2500: 113 5.7l(a/t) & 7.4l a5-5.0l(m/t) & 5.7l(m/t) (behind left (behind left side of i/p) (center rear (front axle (inside fuel tank) (left rear side (left top front of engine) (turn-hazard (under left side of i/p) (under left side of i/p, (under left side of i/p, taped to i/p harness) (under right side of i/p) (w/o drl-dimmer switch; w/ drl-daytime running **e2-4.3l & 7.4l a7-5.0l & 5.7l *e6-4.3l, 5.0l(a/t), 4- wheel abs 4-wheel 4-wheel anti-lock brake module (near master cylinder) 4wd ind. Abs only Anti-lock Anti-lock brakes ind. Audio alarm Brake ind. Brake module (near master Brake pressure warning switch (below master cylinder, at combination valve) Center) Charge ind. Check gauges ind. Check gauges lamp driver Control module Convenience Coolant temp. Coolant temp. gauge Cylinder) Daytime Daytime running Daytime running lamps relay Diode Diode (behind left side of i/p) Drl ind. Engine coolant temperature sender Engine speed Engine) Exhaust manifold) Exterior lights Fuel gauge Fuel level Fuel pump & sender Fuse block: i/p G110 G202 Gauges fuse 20a Generator (left top front of Gnd Harness) Headlights system High beam ind. Hot in run, bulb test or start Ign Ignition coil Ignition switch Illum. Illum. lamps Instrument cluster J i Lamps module Lamps module) Left turn ind. M/t only Malfunction ind. Module Of engine) Of transmission) Oil press. Oil press. gauge Oil pressure switch & sender (left rear of engine, under Only Over 15,000 Panel lps fuse 5a Park brake warning switch (under left side of i/p) Pounds gvw Powertrain Rear anti-lock brake module (left rear of engine compt) Rear wheel abs Release relay) Right turn ind. Running lamps module Safety belt ind. Side of i/p, in Solenoid switch) Speed sensor Speedo- meter Switch) System Tach test connector Tacho- meter Tailgate release system (endgate window Tan Taped to i/p Transmissions Twisted pair Upshift ind. Variable voltage w/ head/park lamps on & dimmer sw adjusted Vehicle speed Vehicle speed sensor buffer (behind right side of i/p) Volt- meter W/ 4-wheel W/ drl W/ drl only W/o drl
INTERIOR LIGHTS Courtesy Lamp Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Courtesy Lamp Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 20 (at dlc ) (at underhood lamp) Battery junction block (right rear engine compartment, at cowl) C239a Cargo lamp Cargo lamp switch Convenience center Courtesy switch Ctsy fuse 20a Front dome lamp Fuse block G127 G206 Hot at all times In-line fuse 5a (on cowl, near battery junction block) Left front door jamb switch Panel dimmer switch Red Right front door jamb switch Underhood reel lamp Courtesy Lamp Wiring Diagram, Crew Cab with Auxiliary Lighting for Chevrolet Cab & Chassis C1994 2500 List of elements for Courtesy Lamp Wiring Diagram, Crew Cab with Auxiliary Lighting for Chevrolet Cab & Chassis C1994 2500: 34 (at dlc) (at underhood lamp) (near front dome lamp) (near rear dome lamp) Battery junction block (right rear engine compartment, at cowl) C227 C239a C269 Cargo lamp Cargo lamp switch Convenience center Courtesy switch Crew cab only Ctsy fuse 20a Front dome and reading lamps Fuse block G127 G206 G908 G909 Hot at all times I/p compartment box lamp a In-line fuse 5a (on cowl, near battery junction block) Lamp Left front door jamb switch Left rear door jamb switch Nca Panel dimmer switch Rear dome and reading lamps Red Right front door jamb switch Right i/p courtesy lamp Right rear door jamb switch Underhood reel lamp Courtesy Lamp Wiring Diagram, Crew Cab with Overhead Roof Console for Chevrolet Cab & Chassis C1994 2500 List of elements for Courtesy Lamp Wiring Diagram, Crew Cab with Overhead Roof Console for Chevrolet Cab & Chassis C1994 2500: 28 (at dlc ) (at underhood lamp) (near front dome lamp) Battery junction block (right rear engine compartment, at cowl) C227 C239a Cargo lamp Cargo lamp switch Convenience center Courtesy switch Crew cab only Crew cab, suburban, utility w/overhead roof console Ctsy fuse 20a Front dome lamp Fuse block G127 G206 G908 Hot at all times In-line fuse 5a (on cowl, near battery junction block) Left front door jamb switch Overhead roof console lamps Panel dimmer switch Rear dome lamp Red Right front door jamb switch Suburban/yukon base Underhood reel lamp Instrument Illumination Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Instrument Illumination Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 33 (5) bulbs (at dlc) (at right "d" pillar) Ashtray lamp Auxiliary a/c-heater front control lamp C203 C206 C215 C224 C258 Convenience center Dim Four-wheel drive illumination lamp Fuse block G206 G206 (at dlc) G998 Head Headlight switch assembly Heater a/c control lamps Heater control lamps High Hot at all times Instrument cluster Light switch Off Panel dimmer switch assembly Park Park lp fuse 20a Pnl lps fuse 5a Radio Rear defogger lamp Solid state
POWER DISTRIBUTION Power Distribution Wiring Diagram, Diesel (1 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Diesel (1 of 4) for Chevrolet Cab & Chassis C1994 2500: 71 (pcm) 4wal module Accy Audio alarm module convenience center Auxillary cooling fan relay Brake switch Bulb test C10 C100 C103a C231 C255 C256 Cigarette lighter Clutch pedal switch Conven- ience center Convenience center Crank fuse 5a Ctsy fuse 20a Daytime running lamps relay Dome lamp Drl fuse 15a Ecm-ign, turn b/u & gauges fuses Exc. suburban & utility Fuel pump relay Fuel pump relay Fuel pump/oil pressure Fuse block Fusible Fusible link G206 (at data link connector) Generator Glow plug controller Glow plugs Hazard flasher Headlight switch assembly High blower relay Horn relay convenience center Htr-a/c, rr hvac, 4wd & brake fuses Ignition switch Left battery Link Lock Low blower relay Medium blower relay Off Park lps fuse 20a Pnk Powertrain control module Pwr acc circuit breaker Radio Rear wheel antilock brake module Rear window release relay Rear window release switch Red Right battery Rr wpr, frt wpr, rdo fuses and and pwr wdo circuit breaker Rst 12ga Rst 18ga Run Start Starter motor solenoid Stop fuse 15a Suburban & utility Suburban & utility only Switch T/g rel fuse 25a Trans Trans fuse W/ auto W/ automatic transmission Power Distribution Wiring Diagram, Diesel (2 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Diesel (2 of 4) for Chevrolet Cab & Chassis C1994 2500: 34 (suburban & crew cab only) C241 C247 C259 C276a Convenience center Frt wpr fuse 25a Fuse block Fusible link Ignition switch In-line fuse 3a Left front power window switch Left power door lock switch Left power seat Left rear power window switch O r g Pnk Power acc circuit breaker 30a Power door lock relay Power outside mirror switch Pwr wdo circuit breaker 30a Radio Rdo fuse 10a Rear window defogger switch Rear wiper/ washer switch Red Right front power window switch Right power door lock switch Right rear power window switch Rr wpr fuse 25a Suburban & utilty only W h t Wiper motor module Wiper washer switch Power Distribution Wiring Diagram, Diesel (3 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Diesel (3 of 4) for Chevrolet Cab & Chassis C1994 2500: 44 (four wheel antilock) (rear wheel antlock) 4wd fuse 25a A/c clutch relay A/c control module Antilock brake module Auxilliary heater-a/c front control Auxilliary heater-a/c logic module Auxilliary heater-a/c rear control B r n Brake fuse 15a C1 C10 C2 C5 Convenience center Electronic transmission 4-speed automatic w/overdrive Fuse block Fusible Glow plug control module Glow plug fuse 5a Heater blower switch Heavy duty electronic transmission 4-speed automatic w/overdrive High blower relay Htr-a/c fuse 25a Ignition switch Instrument cluster printed ciurcuit Interior lights system Left glow plugs Low blower relay Med blower relay Mode door motor Panel dimmer switch assembly (interior lights system) Pnk Pnl lps fuse 5a Powertrain control module R e d Right glow plugs Rr hvac fuse 25a Temp door motor Trans fuse 10a Transfer case switch Vehicle speed sensor buffer module W/ air conditioning Power Distribution Wiring Diagram, Diesel (4 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Diesel (4 of 4) for Chevrolet Cab & Chassis C1994 2500: 34 (l49 & l56 engines only) (l56 & l65 only) Audio alarm module convenience center Auxiliary cooling fan relay B l u Backup lamp switch C278 C290 Convenience center Cruise control activator switch Cruise control module Daytime running lamps module (pickup only) Daytime running lamps relay Ecm-ign fuse 10a Egr vent solenoid Egr width modulated solenoid F/sol fuse 20a Fuel heater Fuel injection pump Fuse block Gauges fuse 20a Glow plug control module Ignition switch Instrument cluster printed circuit O r g Pnk Powertrain control module Pulse width modulated boost solenoid Rear defogger switch Sol fuse 5a Tcc/ stoplamp switch Turn signal flasher Turn b/u fuse 15a Water-in-fuel sensor Power Distribution Wiring Diagram, Gasoline (1 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Gasoline (1 of 4) for Chevrolet Cab & Chassis C1994 2500: 70 (pcm) 4wal module Accy Audio alarm module convenience center Auxillary cooling fan relay Battery Brake switch Bulb test C10 C103a C231 C255 C256 Cigarette lighter Clutch pedal switch Conven- ience center Convenience center Crank fuse 5a Ctsy fuse 20a Daytime running lamps relay Dome lamp Drl fuse 15a Ecm-ign, turn b/u & gauges fuses Exc. suburban & utility Fuel pump relay Fuel pump/oil pressure Fuse block Fusible Fusible link G206 (at data link connector) Generator Hazard flasher Headlight switch assembly High blower relay Horn relay convenience center Htr-a/c, rr hvac, 4wd & brake fuses Ignition coil Ignition switch L03 & l05 engines w/ manual transmissions only Link Lock Low blower relay Medium blower relay Off Park lps fuse 20a Pnk Powertrain control module Powertrain control module (pcm) Pwr acc circuit breaker Radio Rear wheel antilock brake module Rear window release relay Rear window release switch Red Rr wpr, frt wpr, rdo fuses and and pwr wdo circuit breaker Rst 12ga Rst 18ga Run Start Starter motor solenoid Stop fuse 15a Suburban & utility Suburban & utility only Switch T/g rel fuse 25a Trans Trans & inj fuses Vin h&k manual trans only W/ auto W/ automatic transmission Power Distribution Wiring Diagram, Gasoline (2 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Gasoline (2 of 4) for Chevrolet Cab & Chassis C1994 2500: 34 (suburban & crew cab only) C241 C247 C259 C276a Convenience center Frt wpr fuse 25a Fuse block Fusible link Ignition switch In-line fuse 3a Left front power window switch Left power door lock switch Left power seat Left rear power window switch O r g Pnk Power acc circuit breaker 30a Power door lock relay Power outside mirror switch Pwr wdo circuit breaker 30a Radio Rdo fuse 10a Rear window defogger switch Rear wiper/ washer switch Red Right front power window switch Right power door lock switch Right rear power window switch Rr wpr fuse 25a Suburban & utilty only W h t Wiper motor module Wiper washer switch Power Distribution Wiring Diagram, Gasoline (3 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Gasoline (3 of 4) for Chevrolet Cab & Chassis C1994 2500: 45 (four wheel antilock) (rear wheel antlock) 4wd fuse 25a A/c clutch relay A/c control module Antilock brake module Auxilliary battery relay Auxilliary heater-a/c front control Auxilliary heater-a/c logic module Auxilliary heater-a/c rear control B r n Brake fuse 15a C1 C10 C2 C5 Convenience center Electronic transmission 4-speed automatic w/overdrive Except vin z Fuse block Heated oxygen sensor Heater blower switch Heavy duty electronic transmission 4-speed automatic w/overdrive High blower relay Htr-a/c fuse 25a Ignition switch Inj fuse 10a Interior lights system Low blower relay Med blower relay Mode door motor Panel dimmer switch assembly (interior lights system) Pnk Pnl lps fuse 5a R e d Red Rr hvac fuse 25a Temp door motor Throttle body fuel injector a Throttle body fuel injector b Trans fuse 10a Transfer case switch Vehicle speed sensor buffer module Vin z only W/ air conditioning Power Distribution Wiring Diagram, Gasoline (4 of 4) for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Distribution Wiring Diagram, Gasoline (4 of 4) for Chevrolet Cab & Chassis C1994 2500: 42 (lo3 & lo5 engines, light duty & yukon w/ lo5 engine) (suburban & utility only) (vin h &k light duty only) Air divert solenoid Air switching valve solenoid (vin n only) Audio alarm module convenience center Auxilliary cooling fan relay B l u Backup lamp switch C278 C290 Convenience center Cruise control activator switch Cruise control module Daytime running lamps module (pickup only) Daytime running lamps relay E15 Ecm-ign fuse 10a Esc module Evaporative emission canister purge solenoid (w/ nrq) Exhaust gas recirculation solenoid valve F15 Fuse block Gauges fuse 20a Heated oxygen sensor (vins h & k) Hot fuel handling module Ignition switch Instrument cluster printed circuit Linear egr regulator valve solenoid (w/ nrq) O r g Overspeed alarm module Pnk Powertrain control module Rear defogger switch Tcc/ stoplamp switch Trottle actuator solenoid (vin n only) Turn signal flasher convenience center Turn b/u fuse 15a Vin n only Vins h & k only Vins h & k w/ automatic transmissions & vins n & z Vins h & k w/ manual transmissions
POWER DOOR LOCKS Door Lock Wiring Diagram, 2 Door for Chevrolet Cab & Chassis C1994 2500 List of elements for Door Lock Wiring Diagram, 2 Door for Chevrolet Cab & Chassis C1994 2500: 14 (under left side of i/p) Acc-batt circuit breaker 30a Convenience center Fuse block G206 (at dlc connector) H tan Hot at all times Left front door lock motor Left front door lock switch Lock Right front door lock motor Right front door lock switch Tan Unlock Door Lock Wiring Diagram, Crew Cab for Chevrolet Cab & Chassis C1994 2500 List of elements for Door Lock Wiring Diagram, Crew Cab for Chevrolet Cab & Chassis C1994 2500: 18 (suburban only) Acc-batt circuit breaker 30a Contactor right rear cargo door (suburban only) Convenience center (under left side of i/p) Door lock relay (behind i/p, right side of brake pedal bracket) Fuse block G206 (at dlc connector) Hot at all times Left front door lock motor Left front door lock switch Left rear door lock motor Lock Power mirror system (in-line fuse) Rear cargo door lock motor Right front door lock motor Right front door lock switch Tan Unlock
POWER MIRRORS Power Mirror Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Mirror Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 18 left outside power mirror Acc-batt circuit breaker 30a Convenience center (under left side of i/p) Convenience center (under left side of i/p) Down Fuse block G206 (at dlc connector) Hot at all times In-line fuse Left Left/ right motor Power outside rearview mirror switch Right Right outside power mirror Up/ down motor
POWER SEATS Power Seat Wiring Diagrams for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Seat Wiring Diagrams for Chevrolet Cab & Chassis C1994 2500: 17 30a Acc-batt circuit breaker Back Convenience center (under left side of i/p) Down Entire seat For- ward Forward/ rearward motor Front height Front tilt motor Fuse block G206 (at dlc connector) Hot at all times Power seat switch (left side of driver's seat) Rear height Rear tilt motor Tan
POWER WINDOWS Power Window Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Window Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 18 (under left side of dash) Acc-ign circuit breaker (exc 1994) 30a C247 C503 C507 Convenience center Fuse block G206 (at dlc connector) Hot in acc or run Left front power window motor Left front switch Left power window master switch Pnk Pwr-wdo circuit breaker (1994) 30a Right front power window motor Right front switch Right front window switch Tan Power Window Wiring Diagram, Crew Cab for Chevrolet Cab & Chassis C1994 2500 List of elements for Power Window Wiring Diagram, Crew Cab for Chevrolet Cab & Chassis C1994 2500: 27 (at dlc connector) (under left side of dash) Acc-ign circuit breaker (exc 1994) 30a C506 C507 Convenience center Fuse block G206 Gauges fuse 20a Hot in acc or run Hot in run or start Left front power window motor Left front window Left rear power window motor Left rear window Left rear window switch Master window switch Pnk Pwr-wdo circuit breaker (1994) 30a Right front power window motor Right front window Right front window switch Right rear power window motor Right rear window Right rear window switch Switch illumination lamp Tan
RADIO 2-Speaker System Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 2-Speaker System Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 23 (ex 1994) (1994) (ex. 1991) Antenna Antenna input Coaxial cable Ctsy fuse 20a Dimmer Fuse block (under left side of dash) G206 (center of dash) Ground Hot at all times Hot in accy or run Ign Interior lights system Left front speaker Lt frt spkr Memory(bat) Park lamp Radio Radio fuse 10a 15a Right front speaker Rt frt spkr Tan AM/FM Stereo for Chevrolet Cab & Chassis C1994 2500 List of elements for AM/FM Stereo for Chevrolet Cab & Chassis C1994 2500: 50 (ex 1994) (1994) Antenna Antenna out Battery C243 C244 C247 C248 C251 Cassette deck Ctsy fuse 20a Data Dimmer Fuse block (under left side of dash) G206 (center of dash) Graphic equalizer Ground Hi ground Hot at all times Hot in accy or run Ignition Interior lights system Left audio Left front speaker Left rear speaker Lf (+) Lf (-) Lo ground Lr (+) Lr (-) Mem (data) Memory Mute Park lamp Pnk Power antenna system Radio control head Radio fuse 10a 15a Radio receiver Red Rf (+) Rf (-) Right audio Right front speaker Right rear speaker Rr (+) Rr (-) Tan Tape on Volt AM/FM Stereo, with Cassette & Amplifier for Chevrolet Cab & Chassis C1994 2500 List of elements for AM/FM Stereo, with Cassette & Amplifier for Chevrolet Cab & Chassis C1994 2500: 66 (ex 1994) (1994) Amplifier relay Antenna Antenna out Battery C10 C11 C12 C13 C14 C15 C243 C244 C247 C248 C251 Cassette deck Convenience center (under left side of dash) Ctsy fuse 20a Data Dimmer Fuse block (under left side of dash) G206 (center of dash) Graphic equalizer Ground Hi ground Hot at all times Hot in accy or run Ignition Interior lights system Left audio Left front speaker Left rear side door speaker Left rear speaker Lf (+) Lf (-) Lo ground Lr (+) Lr (-) Lt rr door spkr Lt rr spkr Mem (data) Memory Mute Not used Park lamp Pnk Power amplifier relay (under dash, left of pedal bracket) Radio control head Radio fuse 10a 15a Radio power amplifier (under driver's seat) Radio receiver Red Rf (+) Rf (-) Right audio Right front speaker Right rear side door speaker Right rear speaker Rr (+) Rr (-) Rt rr door spkr Rt rr spkr Tan Tape on Volt
STARTING/CHARGING
4.3L 4.3L (VIN Z), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 4.3L (VIN Z), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans
5.0L 5.0L (VIN H), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 5.0L (VIN H), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans
5.7L 5.7L (VIN K), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 5.7L (VIN K), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans
6.5L 6.5L (VIN F), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 6.5L (VIN F), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans 6.5L (VIN P), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 6.5L (VIN P), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans 6.5L (VIN S), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 6.5L (VIN S), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans
7.4L 7.4L (VIN N), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Charging Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 35 (12 ga. rust) (closes with low or high voltage; gen fault) (not (not used) (right front of engine) (right inner fender, near battery) (top left front of engine) Bat Battery junction block (right rear of engine compartment, at cowl) C109 C203 Charge indicator (red) Field (rotor) Fuse block Fusible link G101 G110 G119 Gauges fuse 20a Generator (top left front of of engine) Hot in run, bulb test or start Indicators Instrument cluster Left battery Rectifier bridge Regulator solid-state Right battery Starter solenoid (lower right rear of engine, on starter motor) Stator Sw bat Turn on input Used) Volt sense input W/diesel engine W/gasoline engine 7.4L (VIN N), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Starting Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 40 (behind left side of instrument panel) (lower right side of engine) (lower right side of engine, on starter motor) (right front of engine) (right inner fender,near battery) (top left front of engine) (with diesel engine) Accy Battery junction block (right rear of Bulb test C255 C256 Clutch pedal is depressed) (at top of Clutch pedal) Clutch start switch (normally,open closes when Crank fuse Engine compartment, at cowl) Fuse block Fuse block (lower left side of instrument panel) Fusible link (12 ga. rust) G101 G110 G119 Hold-in winding Ignition switch Left battery Lock Off Pull-in winding Pwr acc circuit breaker 30a Red Right battery Run Solenoid contacts Start Starter motor Starter solenoid Stop- hz fuse 15a W/auto trans W/man trans
TRANSMISSION
4.3L 4.3L (VIN Z), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500: 64 (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 3-2 shift sol 3-2 shift sol ctrl A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Data link connector (below left side of i/p) Diagnostic test E10 E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc Tcc sol Tcc/brake switch (top of brake pedal) Test or start Throttle position sensor (right side of tbi) Tp reference Tp signal Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig 4.3L (VIN Z), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 4.3L (VIN Z), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 64 (below left side of i/p) data link connector (left side of transmission) transmission input speed sensor (under right end of i/p) 1-2 shift sol 2-3 shift sol A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Dlc E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Input speed hi Input speed lo Pcm trans shift sol a Pcm trans shift sol b Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc sol Tcc sol ctrl Tcc/brake switch (top of brake pedal) Test or start Throttle position sens Throttle position sensor (right side of tbi) Tp reference Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500: 28 module (under right end of i/p) 4 wheel drive input (not used) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control Convenience center (under left side of i/p) Ehcu module (near master cylinder) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Rwal diode module (under left side of i/p) Suburban, yukon Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case switch (left top of transfer case) W h t Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500: 27 (under right end of i/p) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control module Convenience center (under left side of i/p) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Red Rwal diode module (under left side of i/p) Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case relay (right rear of eng compt, near battery junction block) Transfer case switch (left top of transfer case) Transfer case syncronizer W h t
5.0L 5.0L (VIN H), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.0L (VIN H), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500: 64 (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 3-2 shift sol 3-2 shift sol ctrl A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Data link connector (below left side of i/p) Diagnostic test E10 E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc Tcc sol Tcc/brake switch (top of brake pedal) Test or start Throttle position sensor (right side of tbi) Tp reference Tp signal Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500: 28 module (under right end of i/p) 4 wheel drive input (not used) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control Convenience center (under left side of i/p) Ehcu module (near master cylinder) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Rwal diode module (under left side of i/p) Suburban, yukon Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case switch (left top of transfer case) W h t Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500: 27 (under right end of i/p) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control module Convenience center (under left side of i/p) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Red Rwal diode module (under left side of i/p) Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case relay (right rear of eng compt, near battery junction block) Transfer case switch (left top of transfer case) Transfer case syncronizer W h t
5.7L 5.7L (VIN K), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500: 64 (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 3-2 shift sol 3-2 shift sol ctrl A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Data link connector (below left side of i/p) Diagnostic test E10 E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc Tcc sol Tcc/brake switch (top of brake pedal) Test or start Throttle position sensor (right side of tbi) Tp reference Tp signal Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig 5.7L (VIN K), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 5.7L (VIN K), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 64 (below left side of i/p) data link connector (left side of transmission) transmission input speed sensor (under right end of i/p) 1-2 shift sol 2-3 shift sol A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Dlc E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Input speed hi Input speed lo Pcm trans shift sol a Pcm trans shift sol b Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc sol Tcc sol ctrl Tcc/brake switch (top of brake pedal) Test or start Throttle position sens Throttle position sensor (right side of tbi) Tp reference Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500: 28 module (under right end of i/p) 4 wheel drive input (not used) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control Convenience center (under left side of i/p) Ehcu module (near master cylinder) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Rwal diode module (under left side of i/p) Suburban, yukon Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case switch (left top of transfer case) W h t Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500: 27 (under right end of i/p) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control module Convenience center (under left side of i/p) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Red Rwal diode module (under left side of i/p) Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case relay (right rear of eng compt, near battery junction block) Transfer case switch (left top of transfer case) Transfer case syncronizer W h t
6.5L 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 76 (tft) (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 4 wheel drive low sig A12 Accelerator pedal position (app) module (top of acce- lerator bracket) App #1 App #1 sensor 5v ref App #1 sensor ground App #1 sensor sig App #2 App #2 sensor 5v ref App #2 sensor ground App #2 sensor sig App #3 App #3 sensor 5v ref App #3 sensor ground App #3 sensor sig B10 Battery feed Bracket) C11 C12 C13 C14 C15 D11 D12 Data link connector (below left side of i/p) Diagnostic request E10 E13 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (right side of engine) Fuse block G117 (right rear of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module Pressure control solenoid Pressure ctrl sol hi Pressure ctrl sol lo Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tan Tcc Tcc sol Tcc/ brake switch (on brake pedal support Tcc/brake sw Test or start Trans fluid temp Trans fluid temp sig Trans fuse 10a Trans input spd sig hi Trans input spd sig lo Trans output spd sig Transfer case switch Transmission input speed sensor (left side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vehicle speed sig 6.5L (VIN P), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Transmission Wiring Diagram, 4L60-E for Chevrolet Cab & Chassis C1994 2500: 74 (tft) (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 3-2 control sol 3-2 shift sol 4 wheel drive low sig A12 Accelerator pedal position (app) module (top of acce- lerator bracket) App #1 App #1 sensor 5v ref App #1 sensor ground App #1 sensor sig App #2 App #2 sensor 5v ref App #2 sensor ground App #2 sensor sig App #3 App #3 sensor 5v ref App #3 sensor ground App #3 sensor sig B10 Battery feed Bracket) C11 C12 C13 C14 C15 D11 Data link connector (below left side of i/p) Diagnostic request E10 E13 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (right side of engine) Fuse block G117 (right rear of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module Pressure control solenoid Pressure ctrl sol hi Pressure ctrl sol lo Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tan Tcc sol Tcc sol ctrl Tcc/ brake switch (on brake pedal support Tcc/brake sw Test or start Trans fluid temp Trans fluid temp sig Trans fuse 10a Trans output spd sig Transfer case switch Vehicle speed sensor buffer (under right end of i/p) Vehicle speed sig 6.5L (VIN P), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN P), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 76 (tft) (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 4 wheel drive low sig A12 Accelerator pedal position (app) module (top of acce- lerator bracket) App #1 App #1 sensor 5v ref App #1 sensor ground App #1 sensor sig App #2 App #2 sensor 5v ref App #2 sensor ground App #2 sensor sig App #3 App #3 sensor 5v ref App #3 sensor ground App #3 sensor sig B10 Battery feed Bracket) C11 C12 C13 C14 C15 D11 D12 Data link connector (below left side of i/p) Diagnostic request E10 E13 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (right side of engine) Fuse block G117 (right rear of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module Pressure control solenoid Pressure ctrl sol hi Pressure ctrl sol lo Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tan Tcc Tcc sol Tcc/ brake switch (on brake pedal support Tcc/brake sw Test or start Trans fluid temp Trans fluid temp sig Trans fuse 10a Trans input spd sig hi Trans input spd sig lo Trans output spd sig Transfer case switch Transmission input speed sensor (left side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vehicle speed sig 6.5L (VIN S), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 6.5L (VIN S), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 76 (tft) (under right end of i/p) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 4 wheel drive low sig A12 Accelerator pedal position (app) module (top of acce- lerator bracket) App #1 App #1 sensor 5v ref App #1 sensor ground App #1 sensor sig App #2 App #2 sensor 5v ref App #2 sensor ground App #2 sensor sig App #3 App #3 sensor 5v ref App #3 sensor ground App #3 sensor sig B10 Battery feed Bracket) C11 C12 C13 C14 C15 D11 D12 Data link connector (below left side of i/p) Diagnostic request E10 E13 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (right side of engine) Fuse block G117 (right rear of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Pnk Powertrain control module Pressure control solenoid Pressure ctrl sol hi Pressure ctrl sol lo Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tan Tcc Tcc sol Tcc/ brake switch (on brake pedal support Tcc/brake sw Test or start Trans fluid temp Trans fluid temp sig Trans fuse 10a Trans input spd sig hi Trans input spd sig lo Trans output spd sig Transfer case switch Transmission input speed sensor (left side of transmission) Vehicle speed sensor buffer (under right end of i/p) Vehicle speed sig Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500: 28 module (under right end of i/p) 4 wheel drive input (not used) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control Convenience center (under left side of i/p) Ehcu module (near master cylinder) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Rwal diode module (under left side of i/p) Suburban, yukon Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case switch (left top of transfer case) W h t Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500: 27 (under right end of i/p) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control module Convenience center (under left side of i/p) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Red Rwal diode module (under left side of i/p) Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case relay (right rear of eng compt, near battery junction block) Transfer case switch (left top of transfer case) Transfer case syncronizer W h t
7.4L 7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500 List of elements for 7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for Chevrolet Cab & Chassis C1994 2500: 64 (below left side of i/p) data link connector (left side of transmission) transmission input speed sensor (under right end of i/p) 1-2 shift sol 2-3 shift sol A14 A15 Battery feed Brake sig C10 C13 C14 C215 C218 Dlc E13 E15 E16 Ecm-ign fuse 10a Ect sig Electronic 4-speed automatic overdrive transmission Engine coolant temperature (ect) sensor (top front of engine) F10 F12 F13 F14 F15 f15 Fuse block G110 (left top front of engine) Hot at all times Hot in run, bulb Hot in start or run Ignition feed Input speed hi Input speed lo Pcm trans shift sol a Pcm trans shift sol b Pnk Powertrain control module (pcm) Pressure control hi Pressure control lo Pressure control solenoid Range mode selector Range signal "a" Range signal "b" Range signal "c" Red Sensor ground Serial data Speed sensor (left rear side of transmission) System ground Tcc sol Tcc sol ctrl Tcc/brake switch (top of brake pedal) Test or start Throttle position sens Throttle position sensor (right side of tbi) Tp reference Trans fluid temp (tft) sensor Trans fluid temp sig Trans fuse 10a Trans output speed Vehicle speed sensor buffer (under right end of i/p) Vss sig Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, Except K300 for Chevrolet Cab & Chassis C1994 2500: 28 module (under right end of i/p) 4 wheel drive input (not used) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control Convenience center (under left side of i/p) Ehcu module (near master cylinder) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Rwal diode module (under left side of i/p) Suburban, yukon Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case switch (left top of transfer case) W h t Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500 List of elements for Transfer Case Wiring Diagram, K300 Only for Chevrolet Cab & Chassis C1994 2500: 27 (under right end of i/p) 4 wheel drive low signal 4wd fuse 25a 4wd indicator lamp Automatic transmission only C215 C215a C216a Control module Convenience center (under left side of i/p) Front axle actuator solenoid (right side of front drive axle) Front axle solenoid switch (right rear side of front drive axle) G206 (center of i/p, at dlc) Hot in run I/p fuse block Instrument cluster Panel dimmer switch assembly Panel lps fuse 5a Pickup Powertrain Red Rwal diode module (under left side of i/p) Transfer case mode selector illumination lamp (at transfer case selector lever) Transfer case relay (right rear of eng compt, near battery junction block) Transfer case switch (left top of transfer case) Transfer case syncronizer W h t
WARNING SYSTEMS Warning System Wiring Diagrams for Chevrolet Cab & Chassis C1994 2500 List of elements for Warning System Wiring Diagrams for Chevrolet Cab & Chassis C1994 2500: 22 Audio alarm module (on convenience center) Fasten belts indicator Fasten belts output Fuse block G206 (at dlc connector) Gauges fuse 20a Ground Hot at all times Hot in run, bulb test or start Hot with headlight switch in park or head Ignition on input Instrument cluster Key-in warning Key-in warning buzzer switch Left door jamb switch Lights on input Panel lps fuse 5a Power input Safety belt input Safety belt retractor switch (at driver's safety belt buckle) Stop fuse 15a Tan
WIPER/WASHER Front Washer/Wiper Wiring Diagram for Chevrolet Cab & Chassis C1994 2500 List of elements for Front Washer/Wiper Wiring Diagram for Chevrolet Cab & Chassis C1994 2500: 19 Control area Delay/ speed/ wash control Fuse block Fusible link G106 (above left headlamp) G114 (left rear of engine) Hot in accy or run Ign Low Mist Off Park switch Pnk Pulse Wash pulse switch Windshield washer pump (left front of engine compt, at washer resovoir) Windshield wiper motor module (center rear of engine compt) Windshield wiper/ washer switch Wiper fuse 25a
