Diagram sections — 29 (58 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY COMPUTER COMPUTER DATA LINES CRUISE CONTROL DEFOGGERS ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS MEMORY SYSTEMS POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCKS STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Automatic A/C Wiring Diagram for Chevrolet Blazer 1999 List of elements for Automatic A/C Wiring Diagram for Chevrolet Blazer 1999: 104 (at a/c accumulator) a/c compressor pressure cycling switch (body harness, below i/p fuse block) sp201 (dash harness, between breakout to ground splice & breakout to right courtesy lamp) (dome harness between breakouts to inside air temperature sensor & left sunshade mirror lamp, 5 cm from breakout to sensor) (engine harness, between breakouts to rear heated oxygen sensors connector & body harness connector, 7 cm from breakout to heated oxygen sensor connector) (engine harness, on cathode side of a/c compressor clutch diode, in breakout to a/c compressor & cutoff switch) s104 (right rear of cylinder head) g117 5 volt ref 5v ref A nca A/c A/c comp rly ctrl A/c compres- sor clutch A/c compres- sor clutch diode A/c compressor clutch relay A/c compressor high pressure switch (on rear of a/c compressor) A/c cycling sw sig A/c fuse 10a A/c request A/c request sig A10 Air inlet Air temperature valve sensor & motor (on top right side of heater) B nca B10 Battery Blower motor (on right rear of engine compartment) Body relay block (behind left side of dash, near i/p fuse block) C10 C11 C12 C13 C14 C15 C16 C2 underhood fuse block (on top of left front fender) Class 2 Class 2 data D10 D11 D12 D13 D14 D15 D16 Data link connector (dlc) (partial) (under left side of dash) Defogger system Defrost Elec actuator drive Elec actuator fbck Electric sensor rtn Electronic climate control (ecc) module G104 (left rear of engine compartment) G117 (right rear of cylinder head) G201 (right side of dash) G202 (left side of dash) Gnd Ground Heater Heater/ defrost Hot at all times Hot in run Hot in run & start Hvac 1 fuse 21 10a Hvac fuse 30a Hvac solenoid (behind right side of dash, on hvac assembly) I/p fuse block (on left end of dash) Ign e fuse 10a Ignition Illumination Inside air temperature sensor (in roof over driver's door) Inside temp sens sig Interior lights system Lower disc temp sens Lower discharge air temperature sensor (on left side of floor air outlet) Mode 1 drv Mode 2 drv Mode 3 drv Mode 4 drv Mode 5 drv Nca Outside air temperature sensor (on right radiator support bracket) Outside temp sens sig Power mirrors system (automatic day-night mirrors) Pwm signal output Rdo batt fuse 19 15a Red Rr defog S106 S118 (body harness, between breakouts to blower motor & blower motor relay) S240 (dash harness, 4 cm from breakout to bcm module connector & breakout to instrument cluster) S288 S302 Sensor gnd Solid state Sp200 (on body harness, center front of dash) Sp203 (dash harness, in front of ashtray) Sun load temp sens Sunload sensor (top center of dash) Tan Underhood fuse block (on top of left front fender) Upper disc temp sens Upper discharge air temperature sensor (on top front center of dash, behind radio in duct) Vehicle control module (vcm) (on right front of engine compartment) Compressor Wiring Diagram, Auto A/C for Chevrolet Blazer 1999 List of elements for Compressor Wiring Diagram, Auto A/C for Chevrolet Blazer 1999: 25 (at a/c acumulator) a/c compressor pressure cycling switch (engine harness between breakouts to rear heated oxygen sensors connector & body harness connector, 7 cm from breakout to heated oxygen sensor connector) s106 (engine harness, on cathode side of a/c compressor clutch diode, in breakout to a/c compressor & cutoff switch) s104 (right rear of cylinder head) g117 A/c comp rly ctrl A/c compresor clutch A/c compressor clutch diode A/c compressor clutch relay A/c compressor high pressure switch (on rear of a/c compressor) A/c cycling sw sig A/c fuse 10a A/c request A/c request sig C11 Class 2 D12 Electronic climate control module Hot at all times Hot in run & start Ign e fuse 10a Nca S103 (engine harness, on anode side of a/c compressor clutch diode, in breakout to a/c compressor & cutoff switch) Sp201 (body harness, below i/p fuse block) Underhood fuse block (on top of left front fender) Vehicle control module (vcm) (on right front of engine compartment) Compressor Wiring Diagram, Manual A/C for Chevrolet Blazer 1999 List of elements for Compressor Wiring Diagram, Manual A/C for Chevrolet Blazer 1999: 32 (engine harness, between breakouts to rear heated oxygen sensors connector & body harness connector, 7 cm from breakout to heated oxygen sensor connector) s106 (right rear of cylinder head) g117 A/c A/c comp rly ctrl A/c compresor clutch A/c compressor clutch diode (in a/c compressor clutch wire harness, behind compressor) A/c compressor clutch relay A/c compressor high pressure switch (on rear of a/c compressor) A/c compressor pressure cycling switch (at a/c accumulator) A/c cycling sw sig A/c fuse 10a A/c request sig Bi-level a/c Blend D12 Defrost Diode, in breakout to a/c compressor & cutoff switch) s104 Heat Heater & a/c controller Hot at all times Hot in run Hot in run & start Hvac fuse 9 20a I/p fuse block (on left end of dash) Ign e fuse 10a Max a/c Nca Off S103 (engine harness, on anode side of a/c compressor clutch diode, in breakout to a/c compressor & cutoff switch) Underhood fuse block (on top of left front fender) Vehicle control module (vcm) (on right front of engine compartment) Vent Manual A/C Wiring Diagram for Chevrolet Blazer 1999 List of elements for Manual A/C Wiring Diagram for Chevrolet Blazer 1999: 69 (dash harness, between breakouts for radio & bcm connector c3, 8 cm from breakout to radio) s205 (engine harness, between breakouts to rear heated oxygen sensors connector & body harness connector, 7 cm from breakout to heated oxygen sensor connector) s106 (left rear of engine compartment) g104 (left side of dash) g202 (right rear of cylinder head) g117 (right side of dash) g201 0.26 ohms 0.71 ohms 2.10 ohms 87a A/c A/c comp rly ctrl A/c compressor clutch A/c compressor clutch diode A/c compressor clutch relay A/c compressor high pressure switch (on rear of a/c compressor) A/c compressor pressure cycling switch (at a/c accumulator) A/c cycling sw signal A/c fuse 10a A/c request signal Air temperature valve electric actuator (on top right side of heater) Bi-level Bi-level a/c Blend Blower motor (on right rear of engine compartment) Blower motor relay (on center rear of engine compartment) Blower motor resistor (on right rear of engine compartment, on blower module) Blower switch D (not used) D12 Def Heat Heater & a/c controller High Hot at all times Hot in park & head Hot in run Hot in run & start Hvac 1 fuse 21 10a Hvac fuse 30a Hvac fuse 9 20a I/p fuse block (on left end of dash) If equipped Ign e fuse 10a Illum (x4) Illum fuse 12 10a Low Max a/c Med Mode door switch Nca Norm Off Pickup Power mirrors system (automatic day/night mirror) S103 (engine harness, on anode side of a/c compressor clutch diode, in breakout to a/c compressor & cutoff switch) S118 (body harness, between breakouts to blower motor & blower motor relay) S215 (dash harness, in breakout to heater controller connectors, 10 cm into breakout) S217 (dash harness, in breakout to heater controller connectors, 6 cm into breakout) Servo amplifier Sp202 (strapped to body harness, at left center of dash) Sp203 (dash harness, in front of ashtray) Switch) s104 Tan Temp control Underhood fuse block (on top of left front fender) Utility Vehicle control module (vcm) (on right front of engine compartment) Vent
ANTI-LOCK BRAKES Anti-lock Brake Wiring Diagrams for Chevrolet Blazer 1999 List of elements for Anti-lock Brake Wiring Diagrams for Chevrolet Blazer 1999: 61 2.2l 4.3l 4wd fuse 15 10a A10 A12 Abs fuse 22 10a Abs maxi fuse 60a Anti-lock indicator B10 Body control module (bcm) (under dash on heater case) Brake lamp control Brake pressure warning switch (right end of ebcm) Brake sw Brake sw input Brake warning indicator Data link connector (under left side of dash) E14 Ebcm ground Electronic brake control module (left front inner fender) Front axle switch (on front axle) G108 (left radiator support) G114 (4.3l) (left rear of engine) G117 (right rear of engine block) G120 (2.2l) (right side of engine) Ground Hot at all times Hot in run I/c logic I/p fuse block Ign Instrument cluster Left front wheel speed sensor Lft frt sensor (+) Lft frt sensor (-) Nca Parking brake warning lamp Powertrain control module (right front of engine compt) Pump motor Pump motor high Pump motor low Pump motor power Rdo batt fuse 19 10a Red Right front wheel speed sensor Rt frt sensor (+) Rt frt sensor (-) S121 (body harn, between breakouts to vcm and blower motor relay) S138 (body harn, between blower motor res and wiper motor breakouts) S240 Serial data line Splice pack (sp200) (body harn, center front of dash) Splice pack (sp201) (left side of dash, below fuse block) Stop lamp switch (on brake pedal support bracket) Tan To transfer case control Transfer case control module Underhood fuse block Vehicle control module (right front of engine compt) Voltage reg Vss Vss input
ANTI-THEFT Forced Entry Wiring Diagram for Chevrolet Blazer 1999 List of elements for Forced Entry Wiring Diagram for Chevrolet Blazer 1999: 56 (2 door, liftgate) (4 door endgate, pickup) (envoy) (utility) 2 door utility pickup w/ au3 4 door utility A12 B10 B11 Battery Body control module (under dash, on heater case) Data Data link connector (under left side of dash) Drv dr switch Fr handle sw G201 (right side of dash) G202 (left side of dash) G404 (left rear body corner) Grd Horn relay Horns system Hot at all times Ignition key alarm switch Instrument cluster Key in ign Left door handle switch Left door jamb switch Left door lock cylinder switch Left rear door jamb switch Liftgate sw Pickup Rear window wiper cutout switch & liftglass ajar jamb switch Right door handle switch Right door jamb switch Right door lock cylinder switch Right rear door jamb switch Rr dr sw S305 (body harn, on breakout to right rear door, on pillar) S427 S501 S601 S900 (right liftgate harness, 5cm before breakout to rear window washer pump motor) Security indicator Sp202 (left center of dash) Splice pack sp201 (below i/p fuse block) Splice pack sp202 (left center of dash) Splice pack sp203 (near ashtray) Splice pack sp204 (center of dash) Tan Tbc fuse 10a Theft Underhood fuse block Utility W/au3 W/o au3 Wiper/ washer system Pass-Key Wiring Diagram for Chevrolet Blazer 1999 List of elements for Pass-Key Wiring Diagram for Chevrolet Blazer 1999: 21 2.2l 4.3l A12 Battery Body control module (under dash, on heater case) Data Data link connector (under left side of dash) Engine controls system (fuel pump relay) G202 (left side of dash) Grd Hot at all times Passlock sensor (at ignition switch) Powertrain control module (on right front of engine compt) Sensor data Sensor pwr Sensor ret Sp202 (left center of dash) Splice pack sp201 (below i/p fuse block) Tbc fuse 10a Underhood fuse block Vehicle control module (on right front of engine compt)
BODY COMPUTER Body Computer Wiring Diagrams for Chevrolet Blazer 1999 List of elements for Body Computer Wiring Diagrams for Chevrolet Blazer 1999: 87 (103 or 352) (524 or 1969) 4.3l A10 A11 A12 All door lock relay ctrl Ambient light sensor (on top left side of dash) Ambient light sensor input Anti-theft system B10 B11 B12 Body control module (under dash, on heater case) Btsi trans signal Class 2 serial data signal Computer data lines system Courtesy lamp relay ctrl Cruise fuse 3 10a Dimming ctrl input Dimming signal Dome lamp ctrl Dome over ride switch Door locks system Driver door jamb switch Driver door unlock relay ctrl Drl relay ctrl Engine controls system Exterior lights system Flash-to-pass Front fog lamp relay ctrl Front fog lamp switch input G202 (left side of dash) Gauges fuse 4 10a Ground Headlamp power relay ctrl Headlamp request Headlights system Headlights system (envoy) Hi beam relay Hi beam relay hi High beam input Horn relay ctrl Horns system Hot at all times Hot in run or start I/p fuse block (left side of dash) Ignition (run/start) Inadvertent power relay ctrl Instrument cluster Interior lamps request Interior lights system Key in ignition switch Key in ignition switch (part of ignition switch) Left turn signal input Lift glass relay ctrl Lift glass release switch Light sensor 5v reference Park brake switch input Park brake warning switch (at base of park brake assembly) Park lamp relay ctrl Park lamps on input Pass door jamb switch Pass door unlock relay input Passlock data Passlock sensor power Passlock sensor return Pnk Power (b+) Power distribution Rear doors/lift glass switch Rear lift gate ajar switch Remote function input Retained accy pwr relay ctrl Right turn signal input Seat belt switch input Sp202 (left center of dash) Splice pack sp200 Tan Tbc fuse 10a Theft deterrent Transmission system Trunk, tailgate system Trunk, tailgate sytem Underhood fuse block Vehicle speed sensor input Warning sytems
COMPUTER DATA LINES Computer Data Lines for Chevrolet Blazer 1999 List of elements for Computer Data Lines for Chevrolet Blazer 1999: 32 (behind right front kick panel) transfer case shift control module (w/ 4wd) 2.2l 4.3l A12 Body control module (under dash, on heater case) Body relay block (behind left side of dash, near i/p fuse block) C11 C474 Cigar ltr fuse 2 15a Class 2 Data link connector (dlc) (under left side of dash) Driver information display module (if equipped) Electronic brake control module (ebcm) (on left front inner fender, on brake pressure modulator valve) Electronic climate control module (w/ auto a/c) G117 (right rear of engine) G202 (left side of dash) Hot at all times I/p fuse block (on left end of dash) Instrument cluster Left seat memory module (under left front seat) (envoy only) Nca Powertrain control module (pcm) (2.2l only) (on right front of engine compartment) S152 S250 (envoy only) (body harn sir insert harn, between steering column and sdm breakout) Sp202 (left center of dash) Splice pack sp201 (left side of dash, below i/p fuse block) Tan Transfer case shift control module (w/ 4wd) (behind right front kick panel) Uart Underhood fuse block (on top of left front fender) Vehicle control module (vcm) (4.3l only) (on right front of engine compartment) Vehicle interface unit (viu) (envoy) (rear quarter of vehicle)
CRUISE CONTROL Cruise Control Wiring Diagram for Chevrolet Blazer 1999 List of elements for Cruise Control Wiring Diagram for Chevrolet Blazer 1999: 55 (on left side of firewall) 1999 only 2.2l 4.3l 4.3l only 4wd only A/t A12 A13 A14 A15 Abs fuse 22 10a Anti-lock brakes system Bare Body computer system Body relay block (behind left side of dash) Brake cutout 1 Brake/clutch signal C116 (near top right rear of transmission) Clutch pedal position & cruise control Cruise control module Cruise fuse 3 10a Cruise on/off input Cruise status Cut-out switch (clutch pedal support bracket) Engine control system Exterior lights system G104 (left rear of engine compt) G114 (left rear of engine) G117 (right rear of engine) Ground Hot in run I/p fuse block (left end of dash) Ignition Instrument cluster system M/t Multifunction switch Off Powertrain control module (right front of engine compt) R/a Resume/accel input S134 S140 S152 Set sw Set/coast input Sp200 (body harn, center front of dash) Stoplamp switch (brake pedal support bracket) Underhood fuse block (on top of left front fender) Vehicle control module (right front of engine compt) Vehicle speed input Vehicle speed sensor (vss) (on rear of transmission) Vss Vss high Vss low
DEFOGGERS Defogger Wiring Diagram, Auto A/C for Chevrolet Blazer 1999 List of elements for Defogger Wiring Diagram, Auto A/C for Chevrolet Blazer 1999: 29 C10 D14 Electronic climate control module (center of dash, below radio) G201 (right side of dash) G202 (left side of dash) G405 (right rear body corner) Ground Hot at all times Hot in run Hot in run and start Htd mir fuse 10a Hvac 1 fuse 21 10a I/p fuse block (on left end of dash) Ign 3 Ign e fuse 27 10a Left outside rear view mirror On input Rear defogger relay Rear pushbutton Rear window defogger grid Right outside rear view mirror Rr defog Rr defog fuse 30a S501 S601 Solid state Splice pack sp203 (center of dash) Splice pack sp204 (center of dash) Underhood fuse block (on top of left front fender) Defogger Wiring Diagram, Manual A/C for Chevrolet Blazer 1999 List of elements for Defogger Wiring Diagram, Manual A/C for Chevrolet Blazer 1999: 29 C501 G201 (right side of dash) G202 (left side of dash) G405 (right rear body corner) Heater & a/c controller (under center of dash) Hot at all times Hot in run Hot in run and start Htd mir fuse 10a Hvac 1 fuse 21 10a I/p fuse block (on left end of dash) Ign e fuse 27 10a Ill. Interior lights system Left outside rear view mirror Nca On led Rear defogger relay Rear pushbutton Rear window defogger grid Right outside rear view mirror Rr defog fuse 30a S217 S501 S601 Splice pack sp203 (center of dash) Splice pack sp204 (center of dash) Timer circuit Underhood fuse block (on top of left front fender)
ENGINE PERFORMANCE
4.3L 4.3L VIN W, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Blazer 1999 List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Blazer 1999: 61 (on throttle body assembly) idle air control valve (top rear of automatic transmission) c116 (m-m) (top right rear of engine) evaporative emissions canister purge solenoid valve 1-2 shift sol. ctrl 2-3 shift sol. ctrl 2wd 3-2 ctrl sol. ctrl 4wd Air pmp rly ctrl Anti-lock brakes system Cam posit sens rtn Cam posit sens sig Camshaft position sensor (in distributor) Crank posit sens grd Crank posit sens sig Crankshaft position sensor (front of engine near crankshaft pulley) Ect sens input Egr posit input Evap can vent valve G114 (left rear of engine) G117 (right rear of engine) Hall effect sensor Heated oxygen sensor (bank 1 sensor 1) (in left exhaust pipe, front of converter) Heated oxygen sensor (bank 2 sensor 1) (in right exhaust pipe, front of converter) Iat temp sens sig Idle air ctrl (iac) a hi Idle air ctrl (iac) b lo Inj no.1 ctrl Inj no.2 ctrl Inj no.3 ctrl Inj no.4 ctrl Inj no.5 ctrl Inj no.6 ctrl Knock sens sig Knock sensor (top rear of engine) Left sens hi Left sens lo Map sens input Mass air flow sens Nca Pnk Pnk c Post-catalyst sens hi Post-catalyst sens lo Rear whl speed out Right sens hi Right sens lo S140 S151 Tach out Tan Tcc on/off sol. ctrl Tcc pwm sol ctrl Throttle posit sens Trans temp sens sig Twisted wire pair Vapor press Vehicle control module (vcm) (right front of engine compt) Vehicle speed sensor (rear of transmission) Vss rtn Vss signal 4.3L VIN W, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Blazer 1999 List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Blazer 1999: 40 (in exhaust, behind catalytic converter) 1-2 shift sol. 2-3 shift sol. 3-2 control sol. Automatic transmission Automatic transmission fluid pressure manual valve position switch B10 C10 Central sequential fuel injection D10 D2 sw D3 sw D4 sw E10 Ecm i fuse 15a Eng i fuse 10a Evaporative emission canister vent valve (rear of fuel tank) Exhaust gas recirculation valve (top front of engine) F10 Fuel inj. no1 Fuel inj. no2 Fuel inj. no3 Fuel inj. no4 Fuel inj. no5 Fuel inj. no6 Heated oxygen sensor (post-converter) Hot in run or start Lo sw Oxygen fuse 20a Pnk Pnk pnk pnk Pressure control solenoid valve Red Rev sw S150 Tan Tcc on/off sol. Tcc pwm sol. Transmission fluid temperature sensor Under- hood fuse block 4.3L VIN W, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Blazer 1999 List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Blazer 1999: 60 (eng harn, 6cm from linear egr valve sol breakout) (eng harn, 8 cm from (in air jumper harn, 5 cm from breakout to engine harn) (not used) 12v in 5v ref A10 A11 Air fuse 30a Air fuse block (next to battery) Air injection reactor pump (lower right front of engine compt) Air relay Air sol fuse 10a Battery fuse 175a Body relay block (behind left side of dash) Cruise control system D (p/u) Ecm b fuse 20a Engine coolant temperature sensor (left cylinder head, between 2 rear spark plugs) Engine oil pressure gauge sensor (near distributor) Fuel level sensor (w/ fuel pump) (fuel tank) Fuel pump prime connector Fuel pump relay Fuel tank vapor pressure sensor (fuel tank) Fuse holder (right of radiator) G101 (right front of engine compt) G114 (left rear of engine) G416 (left rear crossmember) G416 (left rear frame rail) Generator breakout) s102 Gnd Hot at all times Hot in run and start Ign e fuse 10a Input oil pres Input speedo Instrument cluster Intake air temperature sensor (in fresh air intake duct) M (utility) Maf sig Manifold absolute pressure sensor (top center of engine) Mass air flow sensor (maf) (on air intake assy) Mil input Pick-up Pnk Pnk pnk pnk Red Rtn S100 (eng harn, 30cm from vcm breakout) S101 S105 S152 Splice pack 422/423 (left side of dash) Tach input Tan a Throttle position sensor (on throttle body assembly) Under- hood fuse block Underhood fuse block Utility Vapor 4.3L VIN W, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Blazer 1999 List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Blazer 1999: 80 (center of dash) splice pack sp200 (not used) (under left side of dash) data link connector 2wd 4wd 4wd f whl lock in 4wd fuse 15 10a 4wd low ind sig 5v ref. voltage 5v return A/c comp relay ctrl A/c request (hi) A/c request (lo) A/c system A12 Abs fuse 22 10a Anti-lock brakes system Body control module (under dash, on heater case) Brake switch input Check eng lp out Clstr fuse 11 10a Cpp sw sig in Cruise control system Cruise engaged sig Distributor (top rear of engine) Egr valve hi Egr valve lo Est output sig Evap cann sol ctrl Fuel level sig in Fuel pump rly ctrl Fused ign Fused ign (run) Fused ign (run/start) G114 (left rear of engine) Gen ctrl Ground High voltage coil wire Hot in off, run or start Hot in run I/p fuse block Ign timing sig. Ignition coil (right side of engine) Ignition control module (top right side of engine) Ignition feed Instrument cluster system Nca P/n Park neutral position switch (left side of transmission) Pnk Pnk a Power b(+) Press ctrl sol lo Press ctrl sol. hi Prndl a sig in Prndl b sig in Prndl c sig in Prndl p sig in Red S106 S113 S138 (body harn, near wiper breakout) S152 Sensor grd Serial data class ii Serial data sig Sound system Spark plugs Splice pack 201 (left side of dash) Splice pack sp200 (center of dash) Starting/ charging system Stoplamp switch (on brake pedal support bracket) Tach. sig. Trans press sig-bit 1 Trans press sig-bit 2 Trans press sig-bit 3 Transmissions system Vcm grd Vehicle control module (vcm) (right front of engine compt) Vss sig
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Chevrolet Blazer 1999 List of elements for Back-up Lamps Wiring Diagram for Chevrolet Blazer 1999: 27 (a/t) (body harn, near breakout to rear doors) s309 (m/t) b (not used) B/u lp fuse 25a B11 c2 Back-up lamp switch (m/t) (2.2l - right side of transmission) (4.3l - left side of transmission) C1 (m/t) C1 f C3 a4 C3 b3 C8 c2 F3 c1 G404 (left rear body corner) Hot in run or start Left backup lamp Mirrors system (automatic day/ night mirror) Pnk c b Right backup lamp S419 S420 S427 Trailer wiring provision Transmission range switch (left side of transmission) Trl b/u fuse 10a Underhood fuse block (on top of left front fender) Veh b/u fuse 15a Exterior Lamps Wiring Diagram for Chevrolet Blazer 1999 List of elements for Exterior Lamps Wiring Diagram for Chevrolet Blazer 1999: 88 (510 ohms) (behind right side of dash) turn signal lamp flasher (body harn, near breakout to chmsl lamp) s408 (center of dash) sp204 (on rear crossmember) sp423 A5 c3 A6 c3 B1 haz pwr a1 turn pwr c1 flshr out B12 c1 B2 gnd Body bussed electrical center (behind left side of dash) Body control module (under dash, on heater case) C1 a4 C1 a8 C1 c1 C1 d11 C1 e2 C1 f11 C10 c1 C2 c1 C3 e4 D1 c3 D10 c1 E10 c1 E9 c1 F10 c1 F12 c1 Fr prk fuse 10a G108 (left radiator support) G109 (right radiator support) G201 (right side of dash) G404 (left rear body corner) G416 (left rear frame rail) Haz lp fuse 20a Hazard Head Headlamp switch High mount stop lamp High mount stop lamp resistor Hot at all times Hot in run or start I/p fuse block (left side of dash) Instrument cluster Interior lights system Left Left front park/ turn lamp Left front side marker lamp Left rear license plate lamp Left turn in Left turn ind Lr prk fuse 10a Lt trn fuse 10a Lt turn fuse 10a Nca Normal Off Park Park lamp relay Park lp fuse 20a Park rly ctrl Park/ turn/ stop lamps Pnk Prk lp fuse 10a Right Right front park/ turn lamp Right front side marker lamp Right rear lamp assembly Right rear license plate lamp Right turn in Right turn ind Rr prk fuse 10a Rt trn fuse 10a S404 S427 Sp100 (at left radiator support) Sp101 (at right radiator support) Sp423 (on rear crossmember) Stop lp fuse 20a Stoplamp switch (on brake pedal support bracket) Tr chmsl fuse 10a Trailer wiring provisions Trl prk fuse 10a Trl trn 10a Trr trn 10a Turn fuse 20a Turn signal switch (part of multi- function switch) Underhood fuse block (top of left front fender) Veh chmsl fuse 10a
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 3) for Chevrolet Blazer 1999 List of elements for Ground Distribution Wiring Diagram (1 of 3) for Chevrolet Blazer 1999: 85 (2.2l) (4.3l) (4.3l) g119 (right front of eng block) (4.3l)g119 (right front of eng block) (engine harn, 7-15 cm from g117 breakout) (engine harn, in breakout to a/c comp and cutoff switch) (envoy) (ex envoy) (not used) (not used) e (pcm) (vcm) (w/o trip) (w/ trip) 2.2l 2.2l: eng harn, 25 cm from pcm breakout) 4.3l A/c compressor clutch A/c compressor clutch diode A/c compressor pressure cycling switch A/t Air injection reactor (air) pump Ambient temperature sensor (w/ overhead console) Bare Battery Body relay block Brake pressure warning switch Cruise control module D12 Data link connector (dlc) Daytime running lamps (drl) relay Driver information display module (utility) E16 Electronic brake control module (ebcm) Envoy Envoy/ bravada Ex envoy/ bravada Fuel pump relay G101 (right front corner of engine compt) G108 (left radiator support) G109 (right radiator support) G115 (rear of engine) G117 (right rear of engine) G118 (right front frame rail) G120 (2.2l) (right side of engine block, under generator) G120 (right side of engine block, under generator) Headlamp power relay (ex envoy) Heated oxygen sensor (ho2s) (bank 1 sensor 1) Heated oxygen sensor (ho2s) (bank 1 sensor 2) Heated oxygen sensor (ho2s) (bank 1 sensor 3) Heated oxygen sensor (ho2s) (bank 2 sensor 1) High mount stop lamp relay (pickup) Ignition control module Instrument cluster Left fog lamp Left front park/ turn lamp Left headlamp high intensity discharge ballast Left high beam headlamp Left horn Low beam relay (envoy) Mass airflow (maf) sensor Nca Park/ neutral position (pnp) switch Powertrain control module (pcm) Rear window washer pump motor Remote control door lock receiver Right fog lamp Right front park/ turn lamp Right headlamp high intensity discharge ballast Right horn S106 (4.3l: eng harn, 7 cm from ho2s breakout S140 (engine harn, near end of vss connector) S151 (heated oxygen sensor harn, 10 cm from right front heated oxygen sensor) S152 Sp100 (left radiator support) Sp101 (right radiator support) Starter relay Transfer case shift control module Underhood fuse block Vehicle control module (vcm)/ powertrain control module (pcm) Vehicle speed sensor (vss) shield Vehicle speed sensor shield Vss connector) W/ air injection reactor system only W/ rke Windshield washer pump motor
HEADLIGHTS Headlight Wiring Diagram for Chevrolet Blazer 1999 List of elements for Headlight Wiring Diagram for Chevrolet Blazer 1999: 74 (2.2l) (4.3l) (left radiator support) g108 (right radiator support) g109 (right side of dash) g201 175a 5v ref 87a A11 Ambient light sensor (top left side of dash) Audo B10 B12 Battery fuse Body control module (under dash, on heater case) Body relay block (left side of dash) C1 b12 C11 Daytime running lamps relay Drl relay ctrl E10 E11 E12 E13 Exterior lights system Fog lamp relay Fog lamp switch Fog lp fuse 15a Fog lp ind Fog rly ctrl Fog sw in Ftp Ftp in G119 (right front of engine block) G120 (right side of engine block under generator) G202 (left side of dash) Hdlp Hdlp sw fuse 7 10a Headlamp ctrl Headlamp ground relay Headlamp power relay Headlamp switch High High beam in High beam/ flash-to- pass switch Hot at all times I/p fuse block Illum Interior lights system Left fog lamp Left high beam headlamp Left low beam headlamp Light sensor Low Lt hdlp fuse 15a Nca Park brake sw Park brake warning switch (base of park brake assembly) Park lamp relay Park lp fuse 20a Park rly ctrl Pklp Red Right fog lamp Right high beam headlamp Right low beam headlamp Rt hdlp fuse 15a Sp100 (left radiator support) Sp101 (right radiator support) Sp202 (left center of dash) Sp203 (near ashtray) Tbc fuse 10a Underhood fuse block Underhood fuse block (top of left front fender)
HORN Horn Wiring Diagram for Chevrolet Blazer 1999 List of elements for Horn Wiring Diagram for Chevrolet Blazer 1999: 17 Battery fuse 175a Body control module (under dash, on heater case) Fuse holder (engine compt, right of radiator) G108 (engine compt, left of radiator support) G109 (engine compt, right inside of radiator support) Horn fuse 15a Horn relay Horn switch Hot at all times Left horn (left fender wall) Red Right horn (right fender wall) Splice pack sp100 (forward lamp harn, left rear of radiator support) Splice pack sp101 (forward lamp harn, right inside of radiator support) Steering column Underhood fuse block (top of left front fender) With anti-theft
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Blazer 1999 List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Chevrolet Blazer 1999: 92 (inside endgate) rear window wiper cutout & liftglass ajar jamb switch (left side of dash) (w/ trip computer) (w/o trip computer) A10 A11 A12 Air bag Air temp Ambient air temperature sensor (front center of vehicle, near hood latch) Anti-lock ind B10 B11 B12 Battery fuel Block) Body control module (under dash, on heater case) Body relay block (behind left side od dash, near i/p fuse Body relay block (behind left side of dash, near i/p fuse block) Brake ind Check gauges ind Clr Clstr fuse 11 10a Compass remote sensor (in headliner above left front seat) Cruise fuse 3 10a Ctsy lamp fuse 8 10a Electronic brake control module (on left front inner fender, on brake pressure module valve) Engine coolant temperature gauge Exterior lights system Fuel gauge Fuel pump switch & engine oil pressure gauge sensor (2.2l: right side of engine) (4.3l: top rear of engine, near distributor) Fused batt Fused ign G117 (right rear of engine) G201 (right side of dash) G202 G404 (left rear body corner) Gauges fuse 4 10a Ground High beam ind Hot at all times Hot in accy, run or rap Hot in off, run or start Hot in run Hot in run or start Hot w/ int dimming on I/p fuse block (left end of dash) Ic logic Ign 1 Illum fuse 12 10a Illumination Instrument cluster Int lite dim Interior lights system Left turn Low fuel Mil (service engine soon ind) Oil pressure gauge Over speed alarm ind Overhead console (utility only) Park position switch (part of automatic transmission controller) Parklamps Pnk Prndl Rdo batt fuse 19 15a Rdo fuse 24 10a Red Right turn S152 S205 S240 S310 S427 S900 Seat belt ind Security ind Serial data Service 4wd ind Service body system ind Spare Speedometer Splice pack sp201 (left side of dash) Splice pack sp203 (near ashtray) Tachometer Tail gate alarm ind Transfer case shift control module (behind right front kick panel) Trip/ odo Underhood fuse block (on top of left front fender) Upshift ind Volt reg Volt- meter Vss in Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Blazer 1999 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Chevrolet Blazer 1999: 51 (eng harn, 8 cm from generator breakout) (not used) (pickup) a (utility) j 2.2l 2wd 4.3l 4wd Body control module C118 (m-m) (near top rear of transmission) Ect sens grd Ect sens sig in Ect sensor in Ect sensr grd Engine coolant temperature sensor (front of engine, in coolant piping) Engine coolant temperature sensor (left cylinder head, between two rear spark plugs) b Fuel level sens grd Fuel level sensor w/ fuel pump (top of fuel tank) Fuel level sig in Fuel lvl in G115 (rear of engine) G117 (right rear of engine) Mil ind Mil ind ctrl Park/neutral position switch (left side of transmission) Powertrain control module (2.2l only) (right front of engine compt) Prndl a Prndl a sig Prndl b Prndl b sig Prndl c Prndl c sig Prndl p Prndl p sig Radio S100 (engine harn, 30 cm from vcm breakout) S102 S152 Serial data Splice pack sp200 (center of dash) Splice pack sp422 (near transmission Splice pack sp422/423 (left side of dash) Tach out Transmission range switch (left side of transmission) Vehicle control module (4.3l only) (right front of engine compt) Vehicle speed sensor (rear of transmission) Vehicle speed sensor (rear transmission) Vss high Vss low Vss out Vss sig out
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram (1 of 2) for Chevrolet Blazer 1999 List of elements for Courtesy Lamps Wiring Diagram (1 of 2) for Chevrolet Blazer 1999: 52 (w/ ec mirror) (w/o ec mirror) (w/o ec mirror) (w/ ec mirror) All others Anti-theft system B11 B12 Base Body bussed electrical center (bbec) Body control module (behind dash, mounted to heater) Cargo lamp Courtesy lamp relay Ctsy lamp fuse 8 10a Dome lamp Endgate/ lftgate jamb switch Envoy Except envoy From outside rearview mirror lamp (diagram 2 of 2) From overhead console (diagram 2 of 2) G201 (right side of dash) G202 (left side of dash) G404 (right rear body corner) Hot at all times I/p compartment lamp I/p fuse block Inadvertent power lamp relay Inside rearview mirror lamp Jamb sw input Jamb sw input c3 Left console courtesy lamp Left front door jamb switch Left rear door jamb switch (4 door) Nca Relay control Relay input c2 Right console courtesy lamp Right front door jamb switch Right rear door jamb switch (4 door) S286 S300 (dome lamp harn, 6 cm into dome and chmsl breakout) S302 S305 (body harn, in breakout to right rear door) S427 Sp202 Sp203 Tan To overhead console (diagram 2 of 2) To splice s332 (diagram 2 of 2) Underhood lamp W/ inside rearview mirror only W/ overhead console only W/ sunshade and inside rearview mirror W/o overhead console only Courtesy Lamps Wiring Diagram (2 of 2) for Chevrolet Blazer 1999 List of elements for Courtesy Lamps Wiring Diagram (2 of 2) for Chevrolet Blazer 1999: 23 (dome lamp harn, 5 cm from sunshade mirror lamp left) s310 (w/ ec mirror) (w/o ec mirror) (w/o ec mirror) (w/ ec mirror) Dome lamp Dome light Driver information display module From body relay block (diagram 1 0f 2) G202 (left side of dash) Inside rearview mirror or driver information display module Inside rearview mirror or drver information display Left sunshade mirror lamp Overhead console w/ sunroof Overhead console w/o sunroof Right sunshade mirror lamp S300 (dome lamp harn, 6 cm into dome and chmsl breakout) S302 S310 S332 (dome lamp harn, 23 cm from sunshade mirror lamp breakout) S332 (dome lamp harn, 4 cm from dome lamp breakout) S332 (dome lamp harn, 6 cm from sunroof breakout) To body relay block (diagram 1 0f 2) To splice s300 (diagram 1 of 2) W/ full trip Instrument Illumination Wiring Diagram for Chevrolet Blazer 1999 List of elements for Instrument Illumination Wiring Diagram for Chevrolet Blazer 1999: 66 (4) bulbs (6) bulbs (comp/time) (left front door harn, 8 cm from radio speaker breakout) s502 (right side of dash) g201 (trip) A b Ash tray lamp Automatic transmission indicator lamp Automatic transmission preference switch B a Body bussed electrical center (bbec) (park lamp relay) Body control module (under dash, on heater case) Body relay block (behind left side of dash) C10 Defog switch Dim Dim pot Driver information display module Envoy Except envoy Exterior lamps system Fog lamp switch G201 (right side of dash) G202 (left side of dash) Head Headlamp switch Heater controller or heater & a/c controller or electronic climate control Hot at all times I/p fuse block Illum fuse 12 10a Instrument cluster Left door lock & side window switch Light switch Off Outside rearview mirror switch Park Pickup Prk lp fuse 10a Prk lp fuse 20a Prk lps c2 Radio Rear seat audio control Rear wiper/ washer & endgate/ liftglass window release switch Remote audio player Right door lock & side window switch S205 (dash harn, 8 cm from am/fm radio breakout) S283 (dash harn, 13 cm from tbc module breakout) S335 S336 S350 S501 S601 Sp202 (left center of dash) Sp203 (near ashtray) Sp204 (center of dash) Steering wheel controls Str whl ill fuse 5 2a Transfer case select switch Underhood fuse block Utility W/ auto a/c W/ electronic climate control W/o auto a/c W/o electronic climate control a b Window lockout switch (4 door)
MEMORY SYSTEMS Memory Seat Wiring Diagram for Chevrolet Blazer 1999 List of elements for Memory Seat Wiring Diagram for Chevrolet Blazer 1999: 43 (pwr seat harn, near breakout to memory module) s315 Battery Body relay box (behind left side of dash) Data link connector (under left side of dash) Drive rec Front Frt vert G404 (left rear body corner) Ground Hall sensor Horiz back Horiz fwd Horiz pos Hot at all times Lateral Left power seat adjuster switch Left seat front height motor Left seat front height transducer Left seat lateral motor Left seat lateral transducer Left seat rear height motor Left seat rear height transducer Left seat recliner motor Mem 1 Mem 2 Mem set Pwr seats circuit breaker 25a Rear Rear vert Recline Recline back Recline bk Recline fwd Red Ref voltage S304 S313 S316 (pwr seat harn, near breakout to memory module) Seat memory module (under driver's seat) Sens gnd Serial data Splice pack sp201 (left side of dash below i/p fuse block) Tan
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 5) for Chevrolet Blazer 1999 List of elements for Power Distribution Wiring Diagram (1 of 5) for Chevrolet Blazer 1999: 62 (2.2l) (4.3l) (air jumper harn, near right front corner of engine compartment) Acc Air fuse 30a Air injection reactor fuse block Air injection reactor pump Air relay Air sol fuse 10a B10 B11 Battery Battery fuse 175a Body control module C10 California only Camshaft position (cmp) sensor (4.3l) Central sequential fuel injection (4.3l) Crankshaft position (ckp) sensor (4.3l) D10 E10 Ecm 1 fuse 15a Eng 1 fuse 10a Evaporative emissions (evap) canister purge solenoid valve Evaporative emissions (evap) canister vent solenoid valve F10 From ecm 1 a fuse diagram 1 of 5) Fuel injectors Fusible link (10 ga-red) Gauges fuse 4 10a Generator Hazard switch Heated oxygen sensor (ho2s) (bank 1 sensor 1) Heated oxygen sensor (ho2s) (bank 1 sensor 3) (4.3l) Heated oxygen sensor (ho2s) (bank 2 sensor 1) (4.3l) I/p fuse block Ign a fuse 40a Ignition coil (4.3l) Ignition control module (icm) Ignition switch Instrument cluster Lock Mass airflow (maf) sensor (4.3l) Off Oxygen fuse 20a Pickup Pnk Powertrain control module (pcm) (2.2l) Red Run S105 S150 (heated oxygen sensor harn, pnk near heated oxygen sensor breakout) Sir fuse 16 15a Start Starter Starter relay To b/u lp fuse (diagram 2 of 5) To eng 1 fuse (diagram 1 of 5) To ign c fuse (diagram 2 of 5) Turn fuse 10 20a Underhood fuse block Vehicle control module (vcm) (4.3l) Power Distribution Wiring Diagram (2 of 5) for Chevrolet Blazer 1999 List of elements for Power Distribution Wiring Diagram (2 of 5) for Chevrolet Blazer 1999: 74 (body harn, near rear doors breakout) s309 (load leveling harn, in rear quarter) (not used) (w/ automatic day/night mirror) 2 door 4 door A/c compressor clutch relay A/t Abs fuse 60a Acc Air injection reactor fuse block (calif) Air relay B/u lp fuse 25a B11 B12 Back-up lamp switch Blower motor Blower motor relay Body relay block Brake transmission shift interlock (btsi) solenoid (w/ floor shift a/t) Btsi fuse 10a C12 D12 Daytime running lamps (drl) relay (envoy) Electronic brake control module (ebcm) From b/u lp fuse diagram 2 of 5) From ign a fuse diagram 1 of 5) From oxygen b fuse diagram 1 of 5) Haz lp fuse 20a Hazard switch Headlamp grounding relay (ex envoy) Headlamp switch Hvac fuse 30a (utility) Ign b fuse 50a Ign c fuse 20a Ign e fuse 10a Ignition switch Inside rear view mirror (utility) Left backup lamp (pickup) Left backup lamp (utility) Load leveling height sensor (envoy) Load leveling pump (envoy) Lock M/t Off Park lamp relay Park lp fuse 20a Park/ neutral position (pnp) switch Pnk Rear defogger relay (utility) Red Right backup lamp (pickup) Right backup lamp (utility) Run S473 pnk Sp204 (center front of dash) Sp400 (center of rear crossmember) (pickup) Start Stud 2 fuse 30a Tcc/ stop lamp switch To clstr fuse (diagram 4 of 5) To crank fuse (diagram 4 of 5) To ign e fuse (diagram 2 of 5) To rap maxi fuse (diagram 3 of 5) To rap relay (diagram 5 of 5) To s204 (diagram 5 of 5) Trailer wiring provisions Trailer wiring provisions (utility w/ m/t) Transfer case shift control module (np1) Trl b/u fuse 10a Underhood fuse block Veh b/u fuse 15a W/ climate control W/o climate control Power Distribution Wiring Diagram (5 of 5) for Chevrolet Blazer 1999 List of elements for Power Distribution Wiring Diagram (5 of 5) for Chevrolet Blazer 1999: 93 (body harn, 7 cm from g404 breakout) (bravada) c1 (envoy) (ex bravada) (ex envoy) (i/p harn, near bcm breakout) (ip harn, in heater controller breakout) s217 (not used) (w/ trip) (w/np1) (w/o np1) (w/o trip) 4.3l 2wd 4wd fuse 15 10a 87a A11 A5 c4 Abs fuse 22 10a Air temperature valve sensor and motor Body control module Body relay block C12 C474 Cruise control module Cruise fuse 3 10a Driver information display module E10 Electronic brake control module (ebcm) Electronic climate control module Envoy Ex envoy Except base pickup From 4wd fuse (diagram 5 of 5) From hi beam fuse (diagram 3 of 5) From ignition switch pin c6 (diagram 2 of 5) From ignition switch pin d6 (diagram 2 of 5) From power seats circuit breaker (diagram 3 of 5) Front axle switch Front drive axle clutch solenoid Frt wpr fuse 17 25a Heater and a/c controller Heater and a/c controller or heater controller (w/o electronic climate control) Heater controller (w/ c42) High beam relay Hvac 1 fuse 21 10a Hvac fuse 9 20a Hvac solenoid assembly I/p fuse block Inside air temperature sensor Inside rear view mirror (w/ automatic day/night mirror) Instrument cluster Left door lock and window switch Left high beam headlamp Left lumbar switch Lt hi fuse 10a Multi- function switch Multifunction switch Nca Outside rear view folding mirror switch Pickup Power window circuit breaker 30a Radio Rdo ign fuse 24 10a Rear seat audio module Rear wiper/ washer switch and endgate/ liftgate window release switch (utility) Retained accessory power (rap) relay Right door lock and window switch (2 door) Right high beam headlamp Right lumbar switch Rr wpr fuse 23 15a Rt hi fuse 10a S204 S290 S476 Sp200 (center front of dash) Steering wheel controls (utility) Str whl rdo ign fuse 18 2a Sunroof module (utility) Tcc/ stop- lamp switch To hvac fuse (diagram 5 of 5) Transfer case select switch (w/ electric shift 4wd) Transfer case shift control module Underhood fuse block Utility Utility w/ climate control Utility w/ manual hvac control Vehicle control module (vcm) Vehicle control module (vcm) (w/o electric shift 4wd) Vehicle interface unit W/ electric shift 4wd W/o memory Window lockout switch (4 door) Windshield wiper motor
POWER DOOR LOCKS Power Door Lock Wiring Diagram for Chevrolet Blazer 1999 List of elements for Power Door Lock Wiring Diagram for Chevrolet Blazer 1999: 44 (body harn, near breakout to rear doors) s307 A5 c1 B11 Battery Body control module (under dash, on heater case) Body relay block Body relay block (behind left side of dash, near i/p fuse block) D10 Door lock relay Door unlock relay Dr lk rly Dr unlk rly Driver door unlock relay Drv dr unlk rly E10 E11 E12 Endgate or liftgate lock cylinder switch F10 F12 G117 (right rear of engine) G202 (left side of dash) Ground Hot at all times I/p fuse block Left door lock and window switch Left front door lock actuator Left rear door lock actuator Liftgate lock actuator Lock Mir/lck fuse 7 10a Mirrors system Pwr lks fuse 14 15a Remote control door lock receiver (behind lower left side of dash) Right door lock and window switch Right front door lock actuator Right rear door lock actuator S308 (body harn, near breakout to left rear door) Splice pack sp202 (left center of dash) Tan Trc fuse 10a Underhood fuse block Unlock W/ keyless entry
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Chevrolet Blazer 1999 List of elements for Electrochromic Mirror Wiring Diagram for Chevrolet Blazer 1999: 25 (left side of dash) g202 (not used) Automatic inside day-night mirror B/u lamp fuse 25 25a B11 Backup lamp switch (a/t) (part of transmission range switch) (2.2l) (on right side of transmission) (4.3l) (on left side of transmission) C/m Exterior lights system Hot in run Hot in run or start Hvac1 fuse 21 10a I/p fuse block (on left side of dash) Interior lamps system Nca Note: s309: (w/o mobile telephone) (body harness, between breakouts for rear doors & endgate connectors, 98 cm from breakout for rear doors) s309: (w/mobile telephone) (body harness, between 4 pin pig tailed connector to driver's seat & rear doors, 7 cm from breakout for left front seat) Off Photo sensor Pnk Power & logic circuits Power distribution system S302 S309 (see note) Splice pack sp200 (strapped to body harness, center front of dash) Underhood bussed electrical center (ubec) (on top of left front fender wall) Veh b/u fuse 12 15a Power Mirrors Wiring Diagram for Chevrolet Blazer 1999 List of elements for Power Mirrors Wiring Diagram for Chevrolet Blazer 1999: 22 1999-01 Body relay block (behind left side of dash, near i/p fuse block) Down Driver outside rearview mirror E12 F12 Front passenger outside rearview mirror G202 (left side of dash) Hot at all times Ilum Interior lights system Left Left/ right m Mir/lcks fuse 7 3a Motor Nca Outside rear view mirror switch Power door locks system Right S501 Underhood fuse block Up/ down m
POWER SEATS 6-Way & Recliner Power Seat Wiring Diagram for Chevrolet Blazer 1999 List of elements for 6-Way & Recliner Power Seat Wiring Diagram for Chevrolet Blazer 1999: 22 Back Body relay block Frt dn Frt up Fwd G404 (left rear body corner) Hot at all times Left seat adjuster switch Pwr seats circuit breaker 20a Rear dn Rear up Recl fwd Recl rwd Right seat adjuster switch S304 S313 S320 Seat front height motor Seat lateral motor Seat rear height motor Seat recliner motor Tan Heated Seats Wiring Diagram for Chevrolet Blazer 1999 List of elements for Heated Seats Wiring Diagram for Chevrolet Blazer 1999: 24 Batt Body controls Cruise fuse 3 10a G404 (left rear body corner) Gnd Heated output Heater element seat back Heater element seat cushion Hot at all time Hot in run Htd seat fuse 20a I/p fuse block Left heated seat module Left lumbar switch Nca Off Pnk Right heated seat module Right lumbar switch S313 S320 Splice pack sp200 Sw/ntc Underhood bussed center Lumbar Wiring Diagram for Chevrolet Blazer 1999 List of elements for Lumbar Wiring Diagram for Chevrolet Blazer 1999: 15 Body relay block G404 (left rear body corner) Hot at all times Left lumbar motor Left lumbar switch Nca Out Pwr seats circuit breaker 20a Red Right lumbar motor Right lumbar switch S304 S313 S320 S427
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagrams for Chevrolet Blazer 1999 List of elements for Power Top/Sunroof Wiring Diagrams for Chevrolet Blazer 1999: 27 (not used) Body relay block (behind left side of dash, near i/p fuse block) C390 C391 C392 Close G202 (left side of dash) Ground Hot in accy, run and rap Ign Ls common Ls1 Ls2 Ls3 Motor close & Motor open & tilt down Open Open & down input Power window circuit breaker 30a Red S302 Sun roof module (at front of sun roof) Sun roof motor (in front of sun roof) Sun roof switch Sw comm Tilt up Tilt up input close &
POWER WINDOWS Power Window Wiring Diagram, 2 Door for Chevrolet Blazer 1999 List of elements for Power Window Wiring Diagram, 2 Door for Chevrolet Blazer 1999: 19 Body relay block (behind left side of dash, near i/p fuse block) C1 f C1 k C2 c Express down module G202 (left side of dash) Hot in acc, run & retained acc power Illum lamp Illumination lamp Interior lights system Left door lock & side window switch Left front window motor Left front window switch Power window circuit breaker 30a Right door lock & side window switch Right front window motor Right front window switch S501 Tan Power Window Wiring Diagram, 4 Door for Chevrolet Blazer 1999 List of elements for Power Window Wiring Diagram, 4 Door for Chevrolet Blazer 1999: 25 (body harn, in breakout to left rear door, on pillar) Body relay block (behind left side of dash, near i/p fuse block) C1 k Express down module G202 (left side of dash) Hot in acc, run & retained acc power Illum Illum- ination lamp Illumination Interior lights system Left front door lock & side window switch Left front window motor Left front window switch Left rear window motor Left rear window switch Power window circuit breaker 30a Right front door lock & side window switch Right front window motor Right front window switch Right rear window motor Right rear window switch S306 S501 Side window lockout switch Tan
RADIO Radio Wiring Diagrams, with Amplifier for Chevrolet Blazer 1999 List of elements for Radio Wiring Diagrams, with Amplifier for Chevrolet Blazer 1999: 87 (1999) (2000-01) 1998-00 A10 A11 A12 Amp feed Ampf fuse 20 25a Antenna Audio amplifier (in center console) Audio rtn B10 B11 B12 Bare Battery Body control module (under dash, on heater case) Dim sig Drain rtn E&c diag Engine controls system Ft aud rtn Ft low Fuse out G201 (right side of dash) G202 (left side of dash) Ground Hot at all times Hot in acc or run Hot in acc run or rap I/p fuse block Ign Interior lights system Led dim Left front door speaker Left rear door speaker Lf audio Lf drain Lf low Lf sp feed Lf sp rtn Lock coil 2 Lr audio Lr low Lr sp feed Lr sp rtn Lt audio Lt remote Mute Nca Powertrain control module (right front of engine compartment) Preset Pwr ant Radio Rdo batt fuse 19 15a Rdo ign fuse 24 10a Rear return Remote rtn Rf audio Rf low Rf sp feed Rf sp rtn Rf spk feed Right front door speaker Right rear door speaker Rly feed Rr audio Rr low Rr sp rtn Rt audio Rt remote S240 Seek Seek dn Sp203 Splice pack sp202 (i/p harn, left side of dash) Splice pack sp203 (i/p harn, in front of ashtray) St col sig Steering wheel controls Str whl rdo ign fuse 24 10a Tan Tape or cd player-remote playback device (in center floor console) Tape sig Vehicle control module (right front of engine compartment) Vol dn Vol up Vss signal Radio Wiring Diagrams, without Amplifier for Chevrolet Blazer 1999 List of elements for Radio Wiring Diagrams, without Amplifier for Chevrolet Blazer 1999: 70 (1999) (2000-01) (i/p harn, between bcm & radio) (i/p harn, between breakouts to lf speaker & cluster) s273 (i/p harn, between breakouts to radio & rt ctsy lamps) s274 (i/p harn, in front of ashtray) (i/p harn, in front of ashtray) b 1998-00 A12 Antenna Audio rtn Bare Battery Body control module (under dash, on heater case) Dim sig Drain rtn E&c diag Engine controls system Fuse out G201 (right side of dash) G202 (left side of dash) Ground Hot at all times Hot in acc or run Hot in acc run or rap I/p fuse block Interior lights system Led dim Left front door speaker Left rear speaker Lf + Lf - Lr + Lr - Lt audio Lt remote Mute Nca Powertrain control module (right front of engine compartment) Preset Radio Rdo batt fuse 19 15a Rdo ign fuse 24 10a Remote rtn Rf + Rf - Right front door speaker Right rear speaker Rr + Rr - Rt audio Rt remote S240 S272 (i/p harn between breakout to radio and rt ctsy lamps) S275 Seek Seek dn Sp203 Splice pack sp202 (i/p harn, left side of dash) Splice pack sp203 St col sig Steering wheel controls Str whl rdo ign fuse 24 10a Tan Tape or cd player-remote playback device (in center floor console) Tape sig Vehicle control module (right front of engine compartment) Vol dn Vol up Vss signal
SHIFT INTERLOCKS Shift Interlock Wiring Diagram, with Column Shift for Chevrolet Blazer 1999 List of elements for Shift Interlock Wiring Diagram, with Column Shift for Chevrolet Blazer 1999: 19 (4 dr. endgate) (left side of dash) g202 (liftgate and (not used) (utility) 2 dr. endgate) B/u lamp fuse 25 25a B12 Brake/ transmission shift interlock solenoid (on shift lever assembly, middle of floor) Btsi fuse 10a C12 C204 Hot in run, or start Park/neutral position switch Pnk Splice pack sp204 Stop lamp switch (on brake pedal support bracket) To transfer case controls Underhood fuse block Shift Interlock Wiring Diagram, with Floor Shift for Chevrolet Blazer 1999 List of elements for Shift Interlock Wiring Diagram, with Floor Shift for Chevrolet Blazer 1999: 16 Automatic transmission controller (in center floor console) B/u lamp fuse 25 25a B12 Body relay block Btsi fuse 10a Btsi solenoid C12 G201 (right side of dash) Hot in run, or start Park solenoid Park/neutral position switch Pnk Splice pack sp204 Tcc/stop lamp switch (on brake pedal support bracket) To transfer case controls Underhood fuse block
STARTING/CHARGING Charging Wiring Diagram for Chevrolet Blazer 1999 List of elements for Charging Wiring Diagram for Chevrolet Blazer 1999: 25 (2.2l) (4.3l) (4.3l) (2.2l) (right front of engine block) g119 g120 (right side of engine block, under generator) (right front of engine compt) powertrain control module or vehicle control module A10 Battery C1 c3 C1 c4 Charge indicator Class ii data Fuse holder (right of radiator) Fusible link (10 ga- red) G109 (right radiator support) G118 (right front frame rail) Generator l Hot at all times I/p fuse block (left end of dash) Instrument cluster L term. control Not used Rdo batt fuse 19 10a 15a Red S240 (4.3l w/ auto a/c) Splice pack 201 (below i/p fuse block) Starter solenoid Starting Wiring Diagram for Chevrolet Blazer 1999 List of elements for Starting Wiring Diagram for Chevrolet Blazer 1999: 41 (4.3l) (2.2l) (a/t) (a/t) (m/t) (m/t) (m/t) (a/t) (right front of engine block) g119 g120 (right side of engine block, under generator) Accy B stud Battery Battery maxifuse 175a Bulb test C1 c2 C2 a11 C3 e2 Clutch pedal position switch (clutch pedal bracket) Crank fuse 10a D11 F11 c1 Fuse holder (right of radiator) Fusible link (10 ga- red) G109 (right radiator support) G118 (right front frame rail) G119 (4.3l) (right front of engine block) G120 (2.2l) (right side of engine block, under generator) Generator Hold- in coil Hot at all times Ign a fuse 40a Ign c fuse 20a Ignition switch Lock Off P/n Pull- in coil Red Run Start Starter motor Starter relay Transmission range switch (left side of transmission) Underhood fuse block (left front fender)
SUPPLEMENTAL RESTRAINTS Supplemental Restraint Wiring Diagram for Chevrolet Blazer 1999 List of elements for Supplemental Restraint Wiring Diagram for Chevrolet Blazer 1999: 44 (body harn, between steering column and sdm breakouts) (right front frame rail) (under left side of dash) data link connector (dlc) Air bag Aux in B12 Bar Body computer system Cluster Data line Driver high Driver low Envoy G118 G118 (right front frame rail) G201 (right side of dash) Gauges fuse 4 10a Ground Hot in run or start Hot w/ park lamps on I/p fuse block (left side of dash) Ignition Illum fuse 12 10a Instrument Interior lights system Navigation system Nca Pass disable Pass enable Pass high Pass low Pickup only Pnk S205 (dash harn, between radio and bcm breakouts) S250 Seat belt sw Seat belt switch Shorting Shorting bar Sir fuse 16 15a Solid state Splice pack sp203 (near ashtray) Tan Warning ind
TRANSMISSION
4.3L 4.3L VIN W, A/T Wiring Diagram, 4L60-E for Chevrolet Blazer 1999 List of elements for 4.3L VIN W, A/T Wiring Diagram, 4L60-E for Chevrolet Blazer 1999: 95 (center of dash) splice pack sp200 (engine harn, 8 cm from breakout to generator) s102 (not used) (twisted wire pair) (w/ auto a/c) (w/ manual a/c) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 2wd 3-2 shift sol 3-2 sol ctrl 4wd 5v reference A/t fluid pressure manual valve position switch A10 A11 Abs All times Anti-lock brakes system Automatic transmission (4l60-e) B10 Battery feed Brake signal Clstr Cruise control system Data link connector (partial) (below left side of dash) Ecm b Ecm i fuse 15a Ect signal Engine controls system Engine coolant temperature sensor (between left two rear spark plugs) Fuse 11 10a Fuse 15 10a Fuse 20a Fuse 22 10a G114 (rear of left cylinder head) G116 (left side of firewall) Hot at Hot in Hot in run Hot in run, off I/p fuse block I/p fuse block (left side of dash) Ignition control module Ignition feed Instrument cluster Junction connector c116 (near top rear of transmission) Malfunction indicator lamp Mil ctrl Nca Or start Pnk Press ctrl so hi Press ctrl sol lo Pressure control solenoid Radio Radio & electronic climate control module Range signal-a Range signal-b Range signal-c Rdo batt fuse 15 15a Red Rev Run Run feed S100 (engine harn, 30 cm from breakout to vcm) S106 S113 S134 S138 (body harn, approx 32 cm from breakout to wiper motor ) S140 S240 Sensor ground Serial data Solid state Splice pack sp201 (left side of dash) Stop lamp switch System gnd Tan Tcc pwm sol Tcc pwm sol ctrl Tcc sol Tcc sol ctrl Tft signal Throttle position sensor (on throttle body) Tp signal Transmission fluid temperature sensor Underhood fuse block Vehicle control module (right front of engine compt) Vehicle speed sensor (4wd) (on transfer case) Vehicle speed sensor) (2wd) (rear of transmission) Vss hi Vss lo 4WD Wiring Diagram, with Auto Trac for Chevrolet Blazer 1999 List of elements for 4WD Wiring Diagram, with Auto Trac for Chevrolet Blazer 1999: 60 (left rear of engine compt) g104 (not used) 4wd fuse 15 10a Atc fuse 20a Bare Body control module Body relay block (behind left side of dash) C10 C11 C12 C13 C14 C15 C16 Class ii data Class ii serial data D10 D11 D12 D13 D14 D15 D16 Data link connector (dlc) (partial) (under left side of dash) Ft shaft speed rtn Ft shaft speed sig G114 (left raer of engine) G201 (right side of dash) Gauges fuse 4 10a Gnd Hot at all times Hot in run Hot in run or start I/p fuse block (on left end of dash) Ign 3 Ign 3 (run) Instrument cluster Module gnd Motor feed a Motor feed b Motor/module pwr Nca Pnk Red Rr shaft speed rtn Rr shaft speed sig S134 bare S152 Service 4wd ind Solid state Splice pack sp200 (center of dash) Splice pack sp201 (center of dash) Splice pack sp204 (center of dash) Transfer case encoder motor (on transfer case, below speed sensor) Transfer case front propshaft speed sensor Transfer case rear propshaft speed sensor Transfer case shift control module (behind right front kick panel) Underhood fuse block Underhood fuse block ((on top of left front fender) Vehicle control module (vcm) (right front of engine compt) 4WD Wiring Diagram, with 2-Speed Automatic Transfer Case for Chevrolet Blazer 1999 List of elements for 4WD Wiring Diagram, with 2-Speed Automatic Transfer Case for Chevrolet Blazer 1999: 94 (left rear of engine compt) g104 +8v ref +8v ref out 2-hi ind 4-hi ind 4-lo ind 4wd fuse 15 10a 4wd indicator switch (on front axle, right of diff) 4wd lo 4wd lo ind sig 4wd sw sig Atc fuse 20a Awd Awd ind Axle sw sig Bare Body control module Body relay block (behind left side of dash) C1 e5 Channel-a Channel-b Channel-c Channel-p Class ii data Class ii serial data Clutch sol sig Crank fuse 10a Data link connector (dlc) (partial) (under left side of dash) Decoder logic E10 E11 E12 E13 E14 E15 E16 Encoder motor Encoder sig rtn F10 F11 F12 F13 F14 F15 F16 Front drive axle clutch solenoid (on firewall, near windshield wiper motor) Ft shaft speed hi Ft shaft speed lo G114 (left raer of engine) G201 (right side of dash) Gauges fuse 4 10a Gnd Ground Hot at all times Hot in run Hot in run or start Hot in start I/p fuse block (on left end of dash) Ign 3 Ignition Illum lamps Instrument cluster Interior lights system Interior lights system, body computer system, sound systems Lock sol out Module ground Motor feed a Motor feed b Motor lock Nca Neutral ind Pnk Pwr Red Rr shaft speed hi Rr shaft speed lo S134 bare S152 Service 4wd ind Solid state Splice pack sp200 (center of dash) Splice pack sp201 (center of dash) Splice pack sp203 (near ashtray) Splice pack sp204 (center of dash) Starting/ charging system Tan Transfer case encoder motor Transfer case front propshaft speed sensor Transfer case rear propshaft speed sensor Transfer case shift control module (behind right front kick panel) Transfer case shift control switch Underhood fuse block Underhood fuse block (on top of left front fender) Vehicle control module (vcm) (right front of engine compt) 4WD Wiring Diagram, with 2-Speed Selectable Transfer Case for Chevrolet Blazer 1999 List of elements for 4WD Wiring Diagram, with 2-Speed Selectable Transfer Case for Chevrolet Blazer 1999: 89 (a/t only) (a/t) pnp switch in (right front of engine compt) vehicle control module (vcm) 12v battery 12v ignition (3) 2 door 2 hi request 2 hi status lamp 2wd hi indicator 2wd hi switch 4 door 4 hi request 4 hi status lamp 4 lo request 4 lo status lamp 4wd fuse 15 10a 4wd hi indicator 4wd hi switch 4wd indicator switch (on front axle, right of diff) 4wd lo in 4wd lo indicator 4wd lo selected 4wd lo switch Anti-lock brakes system Atc fuse 20a Body relay block (behind left side of dash) Btsi fuse 10a C10 C11 C12 C13 C14 C15 C16 Crank fuse 10a Cruise control system Ctsy lp fuse 8 10a D10 D11 D12 D13 D14 D15 D16 Data link connector Data link connector (dlc) (partial) (under left side of dash) Electronic shift transfer case Encoder channel a Encoder channel b Encoder channel c Encoder channel p Encoder channel-a Encoder channel-b Encoder channel-c Encoder channel-p Encoder ground Encoder signal ground G201 (right side of dash) Hot at all times Hot in park or neutral Hot in run Hot in start I/p fuse block (on left end of dash) Ign 3 Ignition Illumination lamp Interior lights system Interior lights system, sound systems, srs system M shift motor Motor control a Motor control b Motor ground Power ground Red S121 (body harn, 6.5 cm from blower motor breakout) S208 Solid state Splice pack sp204 (center of dash) Splice pack sp200 (center of dash) Splice pack sp203 (near ashtray) Splice pack sp204 (center of dash) Starting/ charging system Stoplight switch Transfer case shift control module (behind right front kick panel) Transfer case shift control switch Underhood fuse block (on top of left front fender) Vehicle spd out Vehicle speed in Wheel lck in
TRUNK, TAILGATE, FUEL DOOR Rear Glass Release Wiring Diagram for Chevrolet Blazer 1999 List of elements for Rear Glass Release Wiring Diagram for Chevrolet Blazer 1999: 25 B10 B6 c1 Body control module (under dash, on heater case) Body relay block (left side of dash) C3 a D11 D12 E11 Endgate or liftgate lock cylinder switch Endgate or liftgate window release actuator F10 G201 (right side of dash) G404 (left rear body corner) Hot at all times Left front door lock actuator (open w/ door locked) Liftglass relay Liftglass sw Mir/lck fuse 10a Park brake switch Park brake warning switch Rear window wiper/washer switch and endgate/liftgate window release switch Relay cntrl S427 Sp203 Underhood fuse block
WARNING SYSTEMS Warning System Wiring Diagrams for Chevrolet Blazer 1999 List of elements for Warning System Wiring Diagrams for Chevrolet Blazer 1999: 50 (2 dr) (envoy) (4 dr) j k Auto B11 Battery Body control module (behind dash, on heater case) Cruise fuse 3 10a Door jam switch Front lt left fuse 14 10a Front rt turn fuse 13 10a G108 (left radiator support) G109 (right radiator support) G201 (right side of dash) G202 (left side of dash) G404 (right rear body corner) Gauges fuse 4 10a Ground Hdlp Headlamp req Headlamp switch Hot at all times Hot in park or head Hot in run and start I/p fuse block Ignition 3 Ignition key alarm switch Ignition on input Key in ign Left door jamb switch Left front park and turn signal lamp Left turn sig Park lps fuse 5 10a Park lps in Pklp Pnk Power distribution center Right front park and turn signal lamp Right turn sig S283 S313 Seat belt input Seat belt switch (under left front seat) Sp100 (left radiator support) Sp101 (right radiator support) Sp202 (left side of dash) Sp203 (near ashtray) Sp204 Tan Tbc fuse 10a Underhood fuse block
WIPER/WASHER Front Wiper/Washer Wiring Diagram for Chevrolet Blazer 1999 List of elements for Front Wiper/Washer Wiring Diagram for Chevrolet Blazer 1999: 19 (4.3l) g119 (right front of engine block) (right side of eng block) g120 (2.2l) Control logic Frt wpr fuse 17 25a G104 (left rear of engine compt) Hot in acc or run I/p fuse block (left end of dash) Mist Multi- function switch (wiper/ washer control switch) Off Pulse Red S118 Underhood fuse block (top of left front fender) Washer switch Windshield washer pump (in washer reservoir) Windshield wiper motor assembly Wiper switch Rear Wiper/Washer Wiring Diagram for Chevrolet Blazer 1999 List of elements for Rear Wiper/Washer Wiring Diagram for Chevrolet Blazer 1999: 18 1k ohm G119 (right front of engine block) G404 (left rear body corner) Hot at all times Hot in accy or run I/p fuse block (left end of dash) Logic Off Rear window washer pump (in washer reservoir) Rear window wiper cutout switch and liftgate ajar jamb switch Rear window wiper motor (top center of rear endgate) Rear wiper/washer switch and endgate/ lifgate window release switch Rr w/w fuse 15a Rr wpr fuse 23 15a S427 Underhood fuse block (top of left front fender) Washer switch Wiper switch
