Diagram sections — 29 (50 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES COOLING FAN 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 TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Automatic A/C Wiring Diagram (1 of 2) for Buick Regal GS 2003 List of elements for Automatic A/C Wiring Diagram (1 of 2) for Buick Regal GS 2003: 76 (behind right side of dash) g200 (below dash, left side of steering column) g201 (i/p harn, 18 cm from radio breakout) s230 (i/p harn, 4 cm from hvac control module breakout) (i/p harn, behind center of dash, 4 cm from radio breakout) (i/p harn, right side of steering column, 19 cm from radio breakout) (on right side of of hvac module) vacuum/ electric solenoid 5 v ref A/c solenoid Air temp dr ctrl Ambient air temperature sensor (front of radiator support) Ambient temp sig Battery Bi-level solenoid Blower motor (in hvac module) Blower motor control processor (right side of dash, in hvac module) Blower speed ctrl C10 C11 C12 C13 C14 C15 C16 Class 2 serial data Cntrl in D10 D11 D12 D13 D14 D15 D16 Data link connector (dlc) (under left side of dash, right of steering column) Def mode sol ctrl Defrost solenoid Gnd Grd Heater solenoid High blower fuse 30a Hot at all times Hot in run Hvac control module Hvac fuse 10a I/p fuse block (behind right side of dash) Ign 3 voltage Inside air temperature sensor (below instrument cluster) Inside temp sig Interior lights system Ip dim sw sig Left air temperature actuator (left side of hvac module) Low ref Lt temp dr pos Lwr mode sol ctrl Mix-blnd sol ctrl Nca Radio,hvac, rfa, cluster data link fuse 15a Rear defogger system Recirc sol ctrl Recirc solenoid Red Right air temperature actuator (right side of hvac module) Rr defog rly ctrl Rt temp dr ctrl Rt temp dr pos S202 S231 (i/p harn, 33 cm from hvac control module breakout) S233 S258 Solid state Sp205 (behind data link connector) Spd cntrl Sun load sig Sunload sensor (top right side of dash, near) defogger outlet) Tan Upper mode sol ctrl Automatic A/C Wiring Diagram (2 of 2) for Buick Regal GS 2003 List of elements for Automatic A/C Wiring Diagram (2 of 2) for Buick Regal GS 2003: 51 (cool fan jumper harn, 19 cm from right conn to cooling fan motor) (cooling fan jumper harn, 19.5 cm from right conn to cooling fan motor) s104 (cooling fan jumper harn, 20 cm from left conn to cooling fan motor) (engine harn, front of engine compt, 4 cm from c105 breakout) s105 (engine harn, left side of engine compt, 4 cm from pcm breakout) (fuel inj jumper harn, midway between fuel inj no 3 breakout & map sensor breakout) (top left side of engine, below throttle body) 3.1l 3.8l 5 volt ref A/c compressor clutch A/c clu diode A/c clutch fuse 23 10a A/c clutch relay 15 A/c press signal A/c refrigerent pressure sensor (left front strut tower, on a/c liquid line) A10 A11 C11 Class 2 ser data Clutch rly ctrl Cool fan 1 fuse 15a Cool fan 2 fuse 15a Cool fan 1 relay Cool fan 2 relay Cool fan 3 relay E10 Ect ground Ect signal Engine controls system Engine coolant temperature (ect) sensor F12 G113 (lower Hi spd rly ctrl Hot at all times Ign main relay (closed in run or start) Left coolant fan Left cooling fan diode (3.1l) Left front of engine) Lo spd rly ctrl Low ref Nca Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly) Right coolant fan Right cooling fan diode (3.1l) S101 S102 S103 S121 S167 Underhood fuse block (right side of engine compt, mounted to strut tower) Compressor Wiring Diagram for Buick Regal GS 2003 List of elements for Compressor Wiring Diagram for Buick Regal GS 2003: 43 (i/p harn, 18 cm from radio breakout) (i/p harn, right side of steering column, 19 cm from radio breakout) (lower left front of engine) g113 (w/ auto a/c) (w/ manual a/c) 5 volt ref A/c clu diode A/c clutch fuse 23 10a A/c clutch relay 15 A/c compressor clutch A/c press signal A/c refrigerent pressure sensor (left front strut tower, on a/c liquid line) A/c request Auto a/c Battery C11 C12 Class 2 ser data Clutch request Clutch rly ctrl D12 Engine controls system G200 (behind right side of dash) Ground Hot at all times Hot in run Hvac control module Hvac fuse 10a I/p fuse block (behind right side of dash) Ign main relay (closed in run or start) Ignition Low ref Manual a/c Powertrain control module (left front side of engine compt, in air cleaner assembly) Rdo, hvac, rfa clstr, cel tel fuse 10a S105 (engine harn, front of engine compt, 4 cm from c105 breakout) S167 (engine harn, 4 cm from pcm breakout) S202 S230 S233 (i/p harn, behind center of dash, 4 cm from radio breakout) Serial data Sp205 (behind data link connector) Underhood fuse block (right side of engine compt) Manual A/C Wiring Diagram for Buick Regal GS 2003 List of elements for Manual A/C Wiring Diagram for Buick Regal GS 2003: 89 (behind right side of dash) g200 (cool fan jumper harn, 19 cm from right conn to cooling fan motor) (cooling fan jumper harn, 19.5 cm from right conn to cooling fan motor) (cooling fan jumper harn, 20 cm from left conn to cooling fan motor) (engine harn, front of engine compt, 4 cm from c105 breakout) (engine harn, left side of engine compt, 4 cm from pcm breakout) (fuel inj jumper harn, midway between fuel inj no 3 breakout & map sensor breakout) (i/p harn, 18 cm from radio breakout) (i/p harn, behind center of dash, 4 cm from radio breakout) (left side of hvac module) left air temperature actuator (top left side of engine, below throttle body) +5v reference 3.1l 3.8l A/c compressor clutch A/c clu diode A/c clutch fuse 23 10a A/c clutch relay 15 A/c press signal A/c refrigerent pressure sensor (at left front strut tower, on a/c liquid line) A/c request sig A10 A11 Battery Blower motor (behind right side of dash, in hvac module) Blower motor resistor assembly (under right side of dash, right side of hvac module) C11 Clutch request Comp control Cool fan 1 fuse 15a Cool fan 2 fuse 15a Cool fan 1 relay Cool fan 2 relay Cool fan 3 relay Defogger on Defogger system Drvr temp ctrl E10 Ect ground Ect signal Engine controls system Engine coolant temperature (ect) sensor F12 Fan off input G113 (lower G200 (behind right side of dash) Gnd Ground High blower fuse 30a High blower relay High speed Hot at all times Hot in run Hvac control module Hvac fuse 10a I/p fuse block (behind right side of dash) Ign Ign main relay (closed in run or start) Ignition Interior lights Interior lights system Lamp dim sig Left cooling fan Left cooling fan diode (3.1l) Left front of engine) Low blower fuse 20a Low reference Low speed Nca Nca nca Off Pass temp ctrl Pos Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly) Rdo, hvac, rfa clstr, cel tel fuse 10a Right air temperature actuator (right side of hvac module) Right cooling fan Right cooling fan diode (3.1l) S101 S102 S103 S104 S105 S121 S167 S230 S233 Tan Underhood fuse block (right side of engine compt, mounted to strut tower)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram for Buick Regal GS 2003 List of elements for Anti-lock Brakes Wiring Diagram for Buick Regal GS 2003: 63 A10 A11 Abs fuse 1 60a Abs fuse 10a Anti-lock fail ind B10 B11 B12 Battery Body control module (bcm) (behind left side of dash) left of steering column) Brake fluid level switch (in brake fluid reservoir) Brake ind Brake pressure modulator valve C10 C11 Cluster fuse 10a Data link connector (dlc) (under left side of dash, right of steering column) Delivered torque Desired torque Electronic brake control module (ebcm) (at left side of engine compt, near strut tower) Electronic power steering system G113 (lower left front eng, on transaxle stud left of starter) G203 (below dash, right side of steering column) Ground Hot at all times Hot in run or start Hot in run, bulb test or start I/p fuse block (behind right side of dash, in right door opening) Ignition Instrument panel cluster Interior lights system Left front wheel spd (hi) Left front wheel spd (lo) Left front wheel speed sensor Left rear wheel spd (hi) Left rear wheel spd (lo) Left rear wheel speed sensor Low trac ind Nca Pnk Powertrain control module (pcm) (left front side of eng compt, in air cleaner asemmbly) Pump motor Red Regal Right front wheel spd (hi) Right front wheel spd (lo) Right front wheel speed sensor Right rear wheel spd (hi) Right rear wheel spd (lo) Right rear wheel speed sensor S205 (i/p harn, below dash, near c201, 14 cm from g201 breakout) S211 Serial data signal Splice pack sp205 (behind data link connector) Stop lamp sw out Stop lamp switch (on brake pedal support bracket) Stop lamps fuse 15a Strng var assist motor Tan Trac off ind Traction control switch Underhood fuse block (mounted to right strut tower) Vent tube
ANTI-THEFT Anti-theft Wiring Diagram for Buick Regal GS 2003 List of elements for Anti-theft Wiring Diagram for Buick Regal GS 2003: 49 B10 B12 Batt Bcm gnd Bcm pwr fuse 10a Body control module (behind left side of dash, left of steering column) Cluster fuse 10a Crank fuse 2 40a Crank relay ii Crank signal bcm, cluster fuse 10a Crank voltage Data link connector (dlc) (under left side of dash, right of steering column) F10 G203 (below dash, right side of steering column) Hot at all times Hot in off, run or start Hot in run or start Hot in run, bulb test or start Hot in start Ign Ign 0 Ign 0: cluster pcm & bcm fuse 10a Ign key sig Ign ref lo Ignition switch Instrument panel cluster Ip fuse block K10 K11 Key Key in Key in sig Key out M10 M11 Pass-key enable switch Pcm bcm ign relay fuse 10a Pnk Powertrain control module (left front side of engine compt, in air cleaner assembly) Resistor pellet S211 S270 Security indicator Serial data Splice pack sp205 (behind data link connector) Starter rly ctrl Starter solenoid Tan Underhood fuse block (mounted to right strut tower)
BODY CONTROL MODULES Body Control Modules Wiring Diagram for Buick Regal GS 2003 List of elements for Body Control Modules Wiring Diagram for Buick Regal GS 2003: 97 (2 door) (regal) A/t shift lock sol sup volt A10 A11 A12 Anti-lock brakes system Anti-theft system B10 B11 B12 Bcm acc fuse 10a Bcm power fuse 10a Body control module (bcm) (behind left side of dash, left of steering column) Computer data lines system Courtesy lamp low ctrl Courtesy lamp sw out Crank, signal, bcm, cluster fuse 10a Door lock switch, driver Door lock switch, front passenger Door locks fuse 20a Driver door ajar sw sig Driver seat belt sw input Drl mod output-park brake Drl photocell ret Drl photocell sig Exterior lights system Fog lamp sw out Fuse block, underhood Fuse output-acc/run/crank Fuse output-accessory Fuse output-bat Fuse output-crank Fuse output-ignition 1 G201 (below dash, left of steering column) G203 (below dash, right of steering column) G301 (inside left door sill, forward of left front seat) Grd Headlamp sw output Headlamp sw sig Headlights system Horn relay output Horns system Hot at all times Hot in acc or run Hot in off, run or start Hot in run or start I/p block block I/p fuse block Ign 0, cluster, pcm & bcm fuse 10a Ignition key alarm switch Ignition key resistor lo ref Ignition key resistor sig Inadv power bus fuse 15a Interior lights system Key reminder sw sig Lf turn sig lamp feed Lf turn sig sw output Lock Low tire press reset sw sig Nca Park brake switch (on parking brake assembly) Park lamp sw sig-off Park lamp sw sig-on Pcm, bcm u/h relay fuse 10a Pnk Power distribution system Power distribution system (rap) Pwr dr lk mtr feed Pwr dr lock sw out Pwr dr lock sw output Rap relay ctrl Remote keyless entry circuit Rf turn sig lamp feed Rf turn sig sw output Right ft door open sw sig S211 S234 S269 S270 S283 S303 S330 S504 S604 Seat belt switch (part of driver's seat belt asembly) Serial data sig Serial data signal class 2 Shift interlock system Tan Tire reset switch Traction ctrl sig sw Trunk ajar sw sig Trunk lid release sw sig Trunk release rly feed Trunk, tailgate, fuel doors system Unlock
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Buick Regal GS 2003 List of elements for Computer Data Lines Wiring Diagram for Buick Regal GS 2003: 23 Body control module (bcm) (behind left side of dash, left of steering column) D12 Data clss 2 Data link connector (dlc) (under left side of dash, right of steering column) E & c ser data E & c ser data c2 E1 e & c ser data Electronic brake control module (ebcm) (at left side of engine compt, near strut tower) G200 (behind right side of glove box) G203 (below dash, right side of steering column) Hot at all times Hvac control module I/p fuse block (behind right side of dash, in right door opening) Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat) Instrument panel cluster Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly) Radio Radio, hvac, rfa, cluster, data link fuse 15a S202 S211 S230 Splice pack sp205 (behind data link connector) Vehicle communications interface module (on rear of left rear wheelhouse)
COOLING FAN Cooling Fan Wiring Diagram for Buick Regal GS 2003 List of elements for Cooling Fan Wiring Diagram for Buick Regal GS 2003: 35 (cool fan jumper harn, 19 cm from right conn to cooling fan motor) (cooling fan jumper harn, 19.5 cm from right conn to cooling fan motor) s104 (cooling fan jumper harn, 20cm from left conn to cooling fan motor) (engine harn, front of engine compt, 4 cm from c105 breakout) (fuel inj jumper harn, midway between fuel inj no 3 breakout & map sensor breakout) 3.1l 3.8l A10 A11 C11 Cool fan 1 fuse 15a Cool fan 2 fuse 15a Cool fan 1 relay Cool fan 2 relay Cool fan 3 relay E10 Ect sig Engine controls (map sensor) Engine coolant temperature (ect) sensor (top left side of engine, below throttle body) F12 G113 (lower left front of engine) High spd Hot at all times Left coolant fan Left cooling fan diode (3.1l) Low spd Nca Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly) Right coolant fan Right cooling fan diode (3.1l) S101 S102 S103 S105 Underhood fuse block (right side of engine compt, mounted to strut tower)
CRUISE CONTROL Cruise Control Wiring Diagram for Buick Regal GS 2003 List of elements for Cruise Control Wiring Diagram for Buick Regal GS 2003: 41 (ashtray jumper harn, 5 cm from c242) s295 (front of left strut tower) (i/p harn, 1 cm from sp205 breakout) s240 Anti-lock brakes system B10 Brake signal input Cruise control module Cruise control release switch (on brake pedal bracket) Cruise control switch Cruise fuse 10a Cruise on/off Disable input Disable output Engage input Engaged output Exterior lights system G201 (below dash, left of steering column) Ground Hot at all times Hot in run I/p fuse block (behind right side of dash) Ignition Instrument panel cluster Off Pnk Powertrain control module (pcm) (front left side of engine compt) R/a Release signal Resume/accel S205 (i/p harness, 14 cm from g201 breakout) S283 Set sw Set/coast Stop lamps fuse 15a Stoplight switch (brake pedal support bracket) Vehicle speed input Vehicle speed sensor (vss) (on transaxle right axle case extension) Vss Vss high Vss low Vss output
DEFOGGERS Defoggers Wiring Diagram for Buick Regal GS 2003 List of elements for Defoggers Wiring Diagram for Buick Regal GS 2003: 31 (behind the right side of glove box) (left front door sill) g301 (left side of rear shelf) g401 (man a/c) C1 (auto a/c) c2 D nca D15 d Driver outside rearview mirror G200 Heated mirror fuse 10a Hot at all times Hot in run Hvac control module Hvac fuse 10a I/p fuse block Mirror defogger Nca On ind On/off momentary defogger switch Passenger outside rearview mirror Radio noise suppressor (in right "c" pillar) Rear defog circuit breaker 30a Rear window defogger Rear window defogger relay (behind glove box, mounted to underside of cross-car beam) S230 S233 S268 (i/p harn, near blwr motor) nca S504 S604 Solid state timer Under driver's seat)
ENGINE PERFORMANCE
3.8L VIN 1 3.8L VIN 1, Engine Performance Wiring Diagram (1 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN 1, Engine Performance Wiring Diagram (1 of 4) for Buick Regal GS 2003: 84 (ign harn, top of eng, near ign control module) (not used) (on trans- axle stud) (pin 11 not used) (pin 14-15 not used) (pin 21-27 not used) (pin 40-42 not used) (pin 49-52 not used) (pin 66-67 not used) (right side of engine, on ignition contrl module bracket) (vin 1) 1-2 ss valve control 18x ref signal 2-3 ss valve control 3x ref signal 5 volt ref A/t iss sensor high A/t iss sensor low Anit-lock brakes system Camshaft position sensor (cmp) (front of eng, above crankshaft pulley) Cmp signal Cooling fans system Crankshaft position sensor (ckp) (front of eng, behind harmonic balancer) Cruise control system Cruise disable output Data link connector (dlc) (under left side of dash, right of steering column) Ecm fuse 22 10a Ect sensor signal Egr val control (gnd) Elek ign fuse 25 15a Eng emis fuse 30 10a Evap purge val control F/injr fuse 28 15a Fuel inj 1 control Fuel inj 2 control Fuel inj 4 control Fuel inj 5 control Fuel inj 6 control G111 G113 High speed fans control Hos1 low Hos2 low Hot at all times Hot in off, run bulb test, or start Hot in run, bulb test or start I/p fuse block (behind right side of dash, in right door opening) Iac coil b high Iat sensor ground Ic control Ign 0 fuse 10a Ignition control Ignition control module (icm) (top front of eng) Ignition wake up power Knock sensor bank 1 (left side of eng, in front of starter) Knock sensor bank 2 (right side of eng, below exhaust manifold) Knock sensor signal 1 Knock sensor signal 2 Low speed fans control Map sensor signal Pcm ground Pnk Pnk p Power (battery) Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly) Ref low Requested torque sig S106 S144 S145 S270 Sensor grd Sensor ground Serial data (class 2) Spark plugs Splice pack sp205 Tan Tcc brake switch input Tp sensor signal Tr switch input b Underhood fuse block (mounted to right strut tower) Vss high Vss low Vss output 3.8L VIN 1, Engine Performance Wiring Diagram (2 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN 1, Engine Performance Wiring Diagram (2 of 4) for Buick Regal GS 2003: 15 (on transaxle stud) Evaporative emissions (evap) canister purge solenoid valve (top left side of eng, near center of valve cover) Evaporative emissions (evap) canister vent solenoid valve (behind left side of rear fascia splash shield, in wheelwell) Fuel injectors G113 G113 (on transaxle stud) Pnk S105 S106 S109 Stoplight switch (on brake pedal support bracket) Tan Transaxle range switch (on top right rear of transaxle) Underhood fuse block (mounted to right strut tower) Vehicle speed sensor (vss) (lower right side of eng compt, on transaxle) 3.8L VIN 1, Engine Performance Wiring Diagram (3 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN 1, Engine Performance Wiring Diagram (3 of 4) for Buick Regal GS 2003: 33 (body harn, under rear seat) (eng harn, near 4 cm from pcm breakout) (in exhaust system, rear of catalytic converter) heated oxygen sensor 2 (ho2s 2) (in right side exhaust manifold) heated oxygen sensor 1 (ho2s 1) (on bottom of engine oil pan) engine oil level indicator switch (on throttle body assembly) idle air control (iac) valve (on transaxle stud) (top rear of eng, part of throttle body assembly) mass airflow (maf) sensor A tan A/c refrigerant pressure sensor (on left side of eng compt, on accumulator) B12 D pnk Engine coolant temperature (ect) sensor (top left side of eng, below throttle body) Engine oil pressure indicator switch (lower right side of eng, above transaxle) Exhaust gas recirculation (egr) valve (top rear of eng, near throttle body) Fuel tank pressure sensor (in fuel tank) G113 Hot in run, bulb test or start Instrument cluster Intake air temperature (iat) sensor (left front of eng compt, in air cleaner duct) Malfunction indicator lamp Manifold absolute pressure (map) sensor (top of engine, on front of intake manifold) Nca Oxy sen fuse 29 15a Pnk S105 S167 S409 Supercharger boost control solenoid (vin 1) (top left rear of eng) Tan Throttle position (tp) sensor (on throttle body assembly) Trans fuse 26 10a Underhood fuse block (mounted to right strut tower) 3.8L VIN 1, Engine Performance Wiring Diagram (4 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN 1, Engine Performance Wiring Diagram (4 of 4) for Buick Regal GS 2003: 90 (fuel pump prime terminal) (on transaxle stud) (pin 12-15 not used) (pin 36-38 not used) (pin 40-41 not used) (pin 47-48 not used) (pin 51-54 not used) (pin 6 & 8 not used) (pin 62 & 64-65 not used) (pin 70-75 not used) (right side of rear shelf) (vin 1) 1-2 shift solenoid 2-3 shift solenoid 5v ref a A/c compress clutch rly A/c refrig press signal A/c request signal A/t iss solenoid A11 Air conditioning system Anti-lock brakes system Auto transaxle fluid temperature sensor Automatic transaxle Automatic transaxle fluid pressure manual valve position switch Boost ctrl sol ctrl Cluster fuse 10a Crank Crank signal fuse 10a Cruise control system Cruise engaged input D10 Delivered torque sig Ect sensor signal Egr pintle position signal Egr val ign positive volt Eng oil level ind in Eng oil press sensor sig Evap can vent sol F/pmp fuse 35 15a F/pmp spd cont relay (vin 1 w/ fog lights) F/pump relay Fuel inj 3 control Fuel level sensor Fuel level sensor input Fuel pump Fuel pump relay control Fuel tank Fuel tank press signal G113 G402 Gen terminal f output Gen terminal l output Ho2s 1 signal Ho2s 2 signal Hot at all times Hot in run, bulb test, or start Hot in start I/p fuse block (behind right side of dash, in right door opening) Iac coil a high Iac coil a low Iac coil b low Iat sensor signal Ignition positive volt (2) Map sensor signal Mil control Pc sol valve high Pc sol valve low Pcm,bcm ign relay fuse 10a Pnk Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly) Ps solenoid Red S106 S234 Sensor ground Starter enable control Starting/ charging system Tan Tan b Tcc release switch input Tcc sol valve control Tcc solenoid Tft sensor signal Tp sens or signal Tr switch input a Tr switch input c Trans fluid press sw b Underhood accessory fuse block (mounted to right strut tower) Underhood fuse block (mounted to right strut tower)
3.8L VIN K 3.8L VIN K, Engine Performance Wiring Diagram (1 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN K, Engine Performance Wiring Diagram (1 of 4) for Buick Regal GS 2003: 84 (ign harn, top of eng, near ign control module) (not used) (on trans- axle stud) (pin 11 not used) (pin 14-15 not used) (pin 21-27 not used) (pin 40-42 not used) (pin 49-52 not used) (pin 66-67 not used) (right side of engine, on ignition contrl module bracket) (vin 1) 1-2 ss valve control 18x ref signal 2-3 ss valve control 3x ref signal 5 volt ref A/t iss sensor high A/t iss sensor low Anit-lock brakes system Camshaft position sensor (cmp) (front of eng, above crankshaft pulley) Cmp signal Cooling fans system Crankshaft position sensor (ckp) (front of eng, behind harmonic balancer) Cruise control system Cruise disable output Data link connector (dlc) (under left side of dash, right of steering column) Ecm fuse 22 10a Ect sensor signal Egr val control (gnd) Elek ign fuse 25 15a Eng emis fuse 30 10a Evap purge val control F/injr fuse 28 15a Fuel inj 1 control Fuel inj 2 control Fuel inj 4 control Fuel inj 5 control Fuel inj 6 control G111 G113 High speed fans control Hos1 low Hos2 low Hot at all times Hot in off, run bulb test, or start Hot in run, bulb test or start I/p fuse block (behind right side of dash, in right door opening) Iac coil b high Iat sensor ground Ic control Ign 0 fuse 10a Ignition control Ignition control module (icm) (top front of eng) Ignition wake up power Knock sensor bank 1 (left side of eng, in front of starter) Knock sensor bank 2 (right side of eng, below exhaust manifold) Knock sensor signal 1 Knock sensor signal 2 Low speed fans control Map sensor signal Pcm ground Pnk Pnk p Power (battery) Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly) Ref low Requested torque sig S106 S144 S145 S270 Sensor grd Sensor ground Serial data (class 2) Spark plugs Splice pack sp205 Tan Tcc brake switch input Tp sensor signal Tr switch input b Underhood fuse block (mounted to right strut tower) Vss high Vss low Vss output 3.8L VIN K, Engine Performance Wiring Diagram (2 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN K, Engine Performance Wiring Diagram (2 of 4) for Buick Regal GS 2003: 15 (on transaxle stud) Evaporative emissions (evap) canister purge solenoid valve (top left side of eng, near center of valve cover) Evaporative emissions (evap) canister vent solenoid valve (behind left side of rear fascia splash shield, in wheelwell) Fuel injectors G113 G113 (on transaxle stud) Pnk S105 S106 S109 Stoplight switch (on brake pedal support bracket) Tan Transaxle range switch (on top right rear of transaxle) Underhood fuse block (mounted to right strut tower) Vehicle speed sensor (vss) (lower right side of eng compt, on transaxle) 3.8L VIN K, Engine Performance Wiring Diagram (3 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN K, Engine Performance Wiring Diagram (3 of 4) for Buick Regal GS 2003: 33 (body harn, under rear seat) (eng harn, near 4 cm from pcm breakout) (in exhaust system, rear of catalytic converter) heated oxygen sensor 2 (ho2s 2) (in right side exhaust manifold) heated oxygen sensor 1 (ho2s 1) (on bottom of engine oil pan) engine oil level indicator switch (on throttle body assembly) idle air control (iac) valve (on transaxle stud) (top rear of eng, part of throttle body assembly) mass airflow (maf) sensor A tan A/c refrigerant pressure sensor (on left side of eng compt, on accumulator) B12 D pnk Engine coolant temperature (ect) sensor (top left side of eng, below throttle body) Engine oil pressure indicator switch (lower right side of eng, above transaxle) Exhaust gas recirculation (egr) valve (top rear of eng, near throttle body) Fuel tank pressure sensor (in fuel tank) G113 Hot in run, bulb test or start Instrument cluster Intake air temperature (iat) sensor (left front of eng compt, in air cleaner duct) Malfunction indicator lamp Manifold absolute pressure (map) sensor (top of engine, on front of intake manifold) Nca Oxy sen fuse 29 15a Pnk S105 S167 S409 Supercharger boost control solenoid (vin 1) (top left rear of eng) Tan Throttle position (tp) sensor (on throttle body assembly) Trans fuse 26 10a Underhood fuse block (mounted to right strut tower) 3.8L VIN K, Engine Performance Wiring Diagram (4 of 4) for Buick Regal GS 2003 List of elements for 3.8L VIN K, Engine Performance Wiring Diagram (4 of 4) for Buick Regal GS 2003: 90 (fuel pump prime terminal) (on transaxle stud) (pin 12-15 not used) (pin 36-38 not used) (pin 40-41 not used) (pin 47-48 not used) (pin 51-54 not used) (pin 6 & 8 not used) (pin 62 & 64-65 not used) (pin 70-75 not used) (right side of rear shelf) (vin 1) 1-2 shift solenoid 2-3 shift solenoid 5v ref a A/c compress clutch rly A/c refrig press signal A/c request signal A/t iss solenoid A11 Air conditioning system Anti-lock brakes system Auto transaxle fluid temperature sensor Automatic transaxle Automatic transaxle fluid pressure manual valve position switch Boost ctrl sol ctrl Cluster fuse 10a Crank Crank signal fuse 10a Cruise control system Cruise engaged input D10 Delivered torque sig Ect sensor signal Egr pintle position signal Egr val ign positive volt Eng oil level ind in Eng oil press sensor sig Evap can vent sol F/pmp fuse 35 15a F/pmp spd cont relay (vin 1 w/ fog lights) F/pump relay Fuel inj 3 control Fuel level sensor Fuel level sensor input Fuel pump Fuel pump relay control Fuel tank Fuel tank press signal G113 G402 Gen terminal f output Gen terminal l output Ho2s 1 signal Ho2s 2 signal Hot at all times Hot in run, bulb test, or start Hot in start I/p fuse block (behind right side of dash, in right door opening) Iac coil a high Iac coil a low Iac coil b low Iat sensor signal Ignition positive volt (2) Map sensor signal Mil control Pc sol valve high Pc sol valve low Pcm,bcm ign relay fuse 10a Pnk Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly) Ps solenoid Red S106 S234 Sensor ground Starter enable control Starting/ charging system Tan Tan b Tcc release switch input Tcc sol valve control Tcc solenoid Tft sensor signal Tp sens or signal Tr switch input a Tr switch input c Trans fluid press sw b Underhood accessory fuse block (mounted to right strut tower) Underhood fuse block (mounted to right strut tower)
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Buick Regal GS 2003 List of elements for Back-up Lamps Wiring Diagram for Buick Regal GS 2003: 15 (body harness, under left rear seat) s424 A12 c2 B1 c2 Back-up lamp relay (behind left side of dash) Body control module (bcm) (behind left side of dash) G402 (right side of rear shelf) Hot at all times Left back-up lamp Mirrors system (automatic day/night mirror) R/cmpt rel fuse 7.5a Right back-up lamp S904 (back-up lamp harness, in trunk lid) S915 Underhood fuse block (mounted to right strut tower) W/ automatic day/night mirror Exterior Lamps Wiring Diagram for Buick Regal GS 2003 List of elements for Exterior Lamps Wiring Diagram for Buick Regal GS 2003: 93 (below dash, left side of steering column) g201 (chmsl harn, center of rear window trim panel, 12 cm from chmsl breakout) s417 (i/p harn, right of steering column) (right side of rear shelf) A c1 A10 A11 A12 A12 c3 A13 A14 A15 Ambient light sensor (top right side of dash, at base of windshield) B c1 Body control module (bcm) (behind left side of dash, left of steering column) C2 f12 C2 f8 Center high mounted stoplamp (chmsl) Corn- ering lamp Cornering lamp D12 Drl ambient light ground ref Drl ambient light signal E10 E11 E12 E13 Exterior lamp off input F11 Frt park lps fuse 10a G side marker lamp G101 (left front side of radiator support) G201 (below dash, left side of steering column) G401 (left side of rear shelf) G402 G402 (right side of rear shelf) Hazard Hazard fuse 15a Headlamp control Headlamp relay (behind glove box, mounted to underside of cross-car beam) Headlamp switch Headlamp switch input Hot at all times Hot in run, bulb test or start I/p fuse block I/p fuse block (behind right side of dash) Instrument panel cluster (ipc) Left Left head- lamp assembly Left rear marker lamp Left rear park lamps Left tail/ turn signal/ stop- lamp Left turn indicator Left turn signal Lp park fuse 20a Marker lamp Nca Normal Off Park Park lamp relay (behind right side of dash) Park lamp relay control Park/ turn signal lamp Pnk Power distribution Rear license lamps Right Right head- lamp assembly Right rear marker lamp Right rear park lamps Right side of steering column, 5 cm from ground breakout) s291 Right tail/ turn signal/ stop- lamp Right turn indicator Right turn signal S124 S205 (dash harness, near steering column) S221 S267 S283 S403 S406 S408 S416 Side g Stop lamps fuse 15a Stoplight switch (on brake pedal support bracket) Tail lamps, lic lamps fuse 15a Turn signal Turn signal/ hazard flasher module (below left side of dash) Turn signal/multifunction switch Turn signals, corn lps fuse 10a Underhood fuse block Underhood fuse block (mounted to right strut tower)
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 2) for Buick Regal GS 2003 List of elements for Ground Distribution Wiring Diagram (1 of 2) for Buick Regal GS 2003: 76 (century) (cj2) (cj3) (engine harn, front of engine compt, 4 cm from c105 breakout) (forward lamp harn, below left headlamp, 7 cm from left headlamp breakout) (front floor console harn, in console 6.5 cm from accessory power outlet breakout) (regal) A/c clu diode A/c compressor clutch A18 Ashtray lamp (century) Automatic transmission Auxiliary power outlet (century) Auxiliary power outlet (regal) Battery Blower motor control processor Blower motor resistor assembly C11 C113 C206 Cigar lighter (century) Cigar lighter (regal) Cj2 Cj3 Cool fan 2 relay Data link connector (dlc) Electronic brake control module Eng compt, at base of battery) Engine oil level sensor Engine oil pressure switch F/pump relay Fuse block-underhood G100 G101 (left front side of radiator support) G111 (right side of engine, on ignition control module bracket) G113 (left of starter, on trans- axle stud) G113 (left of starter, on transaxle stud) G200 (behind right side of dash compt) Heated oxygen sensor 1 Heated oxygen sensor 2 Horns Hvac control module I/p compartment lamp switch Ign main relay Ignition control module (icm) Ignition lock cylinder control actuator (regal) Inflatable restraint sensing & diagnostic module Inflatable restraint steering wheel module coil Left air temperature actuator Left cornering lamp Left fog lamp (regal) Left headlamp Left park/ turn signal lamp Left side marker lamp Left steering wheel controls Mass airflow (maf) sensor Nca Power drop connector Powertrain control module (pcm) Red Regal Right air temperature actuator Right cooling fan Right cornering lamp Right fog lamp (regal) Right headlamp Right park/ turn signal lamp Right side marker lamp Right steering wheel controls S105 S106 (eng harn, 7 cm from pcm breakout) S124 S334 S335 Windshield washer fluid level switch Windshield washer fluid pump Ground Distribution Wiring Diagram (2 of 2) for Buick Regal GS 2003 List of elements for Ground Distribution Wiring Diagram (2 of 2) for Buick Regal GS 2003: 97 (back-up lamp harness, in rear compt lid, 29.5 cm from p915) (body harn, under driver's seat, 10 cm from c311 breakout) s303 (left front door harn, 8 cm from window switch breakout) (left tail- lamp harn, (right side of rear shelf) g402 13 cm from right s383 3 cm from p401) s403 5 cm from c420 breakout) A12 Audio amplifier (w/ amp) Automatic headlamp relay Body control module (bcm) Brake fluid level switch C201 Center high mounted stop lamps Chmsl) Cruise control module Data link connector (dlc) Driver information display switch (regal) Driver seat adjuster switch Driver seat belt switch Driver seat heater control module Driver seat heater switch Driver window master switch Driver's heated seat back element Driver's heated seat thermister E16 Exc onstar Fixed antenna Fog lamp switch (regal) Fuel pump G201 (below dash, left side of steering column) G203 (below dash, right side of steering column) G301 (left front door sill) G401 (left side of rear shelf) G402 (right side of rear shelf) Ground (on steering column) Headlamp dimmer switch Headlamp switch Headlamp switch breakout) Headliner harn, left side of windshield header, 10.5 cm from left sunshade mirror breakout) Ignition key alarm switch Inside rearview mirror Instrument panel cluster (ipc) Left back-up lamp Left front door lock Left front door lock switch Left license lamp Left rear door lock (ajar indicator switch) Left rear park lamp Left rear side marker lamp Left roof rail courtesy/ reading lamp Left tail/ stop/turn signal lamp Left vanity mirror lamp Nca Onstar Outside remote control rearview mirror switch Passenger seat adjuster switch Passenger seat heater control module Passenger seat heater switch Passenger's heated seat back element Passenger's heated seat thermistor Radio Radio antenna module Rear compartment lid ajar switch Rear compartment lid lock release actuator Rear compartment lid release switch Rear wdo antenna Rear window defogger grid Remote control door lock receiver Right back-up lamp Right front door lock (ajar indicator switch) Right front door lock switch Right front window switch Right license lamp Right rear door lock (ajar indicator switch) Right rear park lamp Right rear side marker lamp Right roof rail courtesy/ reading lamp Right tail/ stop/turn signal lamp Right vanity mirror lamp S211 (i/p harness, 20 cm from inst cluster breakout) S330 (driver's seat adj harn, 20 cm from c311 breakout) S333 (pass seat harn, 20 cm from c312 breakout) S402 (right taillamp harn, 3 cm from p402) S504 S604 (right front door harn, 8 cm from front pass wdo switch breakout) S905 Sunroof module Tan Tire reset switch Traction control switch (regal) Turn signal/ hazard flasher module Vehicle communications interface module W/ heated seats W/o heated seats Wind- shield wiper motor
HEADLIGHTS Headlights Wiring Diagram for Buick Regal GS 2003 List of elements for Headlights Wiring Diagram for Buick Regal GS 2003: 52 A10 A11 Ambient light sensor (top right side of dash) B7 pnk Body control module (bcm) (behind left side of dash) D11 F10 F2 c3 Fog lamp relay Fog lamp switch Fog lp cntrl Fog lp fuse 10a G101 (front left side of radiator support) G201 (below dash, left side of steering column) Hdlp l fuse 15a Hdlp r fuse 15a Head Headlamp cntrl Headlamp dimmer switch Headlamp relay (behind glove box) Headlamp sw input Headlamp switch High High beam High beam indicator Hot at all times I/p fuse block (behind right side of dash) Illum Instrument panel cluster Interior lights system Left fog lamp Left headlamp Light sens grd ref Light sensor sig Low Low beam Lp park fuse 20a Off Park Park brake switch Park brk sw in Pnk Power distribution system Radio,hvac,rfa, cluster cel tel fuse 15a Right fog lamp Right headlamp S124 S202 S221 (i/p harn, right side of steering column, approx 17cm from dlc breakout) S283 Tan Underhood fuse block (mounted to right strut tower)
HORN Horn Wiring Diagram for Buick Regal GS 2003 List of elements for Horn Wiring Diagram for Buick Regal GS 2003: 22 (century/regal) a17 (steering column) Body control module (left of steering column) C201 C8 c3 G101 (left side of radiator support) G203 (below dash, right side of steering column) High note horn Horn fuse 15a Horn output Horn relay Horn switch Horns (behind right front fascia) Hot at all times Inflatable restraint steering wheel module Low note horn S124 S211 Slip ring Spring Steering column Underhood accessory wiring junction block (mounted on right strut tower)
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram for Buick Regal GS 2003 List of elements for Instrument Cluster Wiring Diagram for Buick Regal GS 2003: 107 (below dash, left side of steering column) g201 (below dash, right side of steering column) A10 A11 A12 Air bag ind Antilock ind B10 B11 B12 Battery Bcm class2 serial data Bcm or ipc serial data Body control module (behind left side of dash, left of steering column) Brake fluid Brake fluid level switch (in brake fluid reservoir) Brake ind Change oil ind Charge ind Cluster fuse 10a Cluster logic Coolant temp ind Coolant temper- ature gauge Crank Crank signal, bcm, cluster fuse 10a Cruise control system Cruise ind D12 Data link connector (under left side of dash, right of steering column) Dic e/m Dic mode Dic reset Door/trunk ajar ind Driver information display switch (regal only) E/m Ebcm class2 serial data Electronic brake control module (ebcm) (at left side of engine compartment, near strut tower) Engine controls system Exterior lights system Fuel gauge G200 (behind right side of dash) G203 G203 (below dash, right side of steering column) Gnd Ground Headlights system High beam ind Hot at all times Hot in off, run or start Hot in run, bulb test or start Hot in start Hvac control module I/p fuse block Ign Ign 01, bcm & pcm, cluster fuse 10a Ignition voltage Igntion 1 Illumination (5 bulbs) Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat) Instrument cluster Interior lights system Left turn ind Left turn signal Low coolant ind Low fuel ind Low oil ind Low oil pressure ind Low tire ind Low trac ind Low washer ind Mal- function indcator lamp (mil) (service engine soon) Mode Pcm class 2 serial data Pcm class2 serial data Pcm, abs bcm & cluster logic serial data Perf shift ind Pk lps Pnk Powertrain control module (left front side of engine compt, in air cleaner assy) Radio, hvac, rfa, cluster, cel tel fuse 15a Reset Right turn ind Right turn signal S202 S211 S230 S234 S270 S283 S295 (ashtray jumper harness, inside ashtray) Sdm class2 serial data Seat belt ind Security ind Serial data Service vehicle soon ind Speed sensor Speedo- meter gauge Splice pack (sp205) (below dash, right of steering column) Srl data Tacho- meter gauge Trac off ind Trip reset input Trip reset switch Vehicle speed Vf display Windshield washer fluid Windshield washer fluid level switch (right front of eng compt, in washer fluid reservoir)
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram (1 of 2) for Buick Regal GS 2003 List of elements for Courtesy Lamps Wiring Diagram (1 of 2) for Buick Regal GS 2003: 33 (body harn, below right front seat) s322 Body control module (bcm) (behind left side of dash, left of steering column) Computer data lines system Court lmps feed Court lmps on Dome Door open input Driver door lock Driver dr open Front passenger door lock G200 (behind right side of dash) G201 (below dash, left side of steering column) G301 (left front door sill) Headlamp switch Hot at all times I/p compart- ment lamp switch I/p fuse block Inadv power bus fuse 15a Left courtesy lamp Left rear door lock Off Regal, century custom Right courtesy lamp Right rear door lock S214 (i/p harn, right side of steering column) S230 S283 S303 S504 S604 Serial data Theater dim (grd) Theater dim 1 Courtesy Lamps Wiring Diagram (2 of 2) for Buick Regal GS 2003 List of elements for Courtesy Lamps Wiring Diagram (2 of 2) for Buick Regal GS 2003: 34 (2002) a (2002) c (2003) a (2003) c (quarter courtesy & reading lamp harn, approx 35 cm from 8-pin in-line conn, behind right "c" pillar) s386 (w/ onstar) (w/o onstar) A1 c3 Base Body computer module (bcm) (behind left side of dash, left of steering column) Body control module (behind left side of dash) Diode Dome lamp Except base G402 (right side of rear shelf) Inside rear view mirror Left roof rail courtesy/ reading lamp Left vanity mirror lamp Nca Rear compartment courtesy lamp Rear compartment lid ajar switch Rear compartment occupant sensor (at left side of rear compt) Right roof rail courtesy/ reading lamp Right vanity mirror lamp S321 (body harn, under right front door pillar) S385 S392 (quarter courtesy & reading lamp harn, approx 5 cm from 8-pin in-line conn, behind right "c" pillar) S400 (body wiring harness, approx 4 cm (1.5 in) from rear compartment courtesy lamp breakout) S414 S433 (occupant sensor pigtail used in place of sensor) S434 (occupant sensor pigtail used in place of sensor) S905 W/ entrapment protection W/o entrapment protection Instrument Illumination Wiring Diagram for Buick Regal GS 2003 List of elements for Instrument Illumination Wiring Diagram for Buick Regal GS 2003: 57 (body harn, below right front seat) s302 (cj2) c16 (cj3) (i/p harn, right side of dash) 2002 regal /century, 2003 regal only Ashtray lamp (century) Dome Driver door lock switch Driver master window switch Driver seat heater switch Electronic traction control switch (regal) Fog lamp switch Front passenger door lock switch Front passenger window switch G200 (behind right side of dash) G201 (below dash, left side of steering column) G203 (below dash, right side of steering column) G301 (left front door sill) Grd Head Headlamp switch High Hot at all times Hvac control module I/p fuse block Illum Inflatable restraint steering wheel module coil Instrument cluster Low Lp park fuse 20a Off Outside rear view mirror switch Panel dimming fuse 7.5a Park Passenger seat heater switch Prndl lamp (regal) Radio Radio control switches Red S211 S230 S241 (i/p harn, below radio) S267 S283 S303 S334 S504 S506 (left front door harn, in left front door) S604 S606 (right front door harn, in right front door) Strg whl cont fuse 2a Tail, lic lamps fuse 15a Underhood fuse block Vf dim dis sig Vf dim sig W/ heated seats W/o heated seats
POWER DISTRIBUTION Power Distribution Wiring Diagram (2 of 3) for Buick Regal GS 2003 List of elements for Power Distribution Wiring Diagram (2 of 3) for Buick Regal GS 2003: 92 (body harn, on tunnel above front seats, 10 cm from c250 breakout) s323 (body harn, under left rear seat, 7 cm from c405 breakout) (cj2) (cj2) (cj3) (i/p harn, behind right side of dash, 4 cm from blower motor control module) (i/p harn, near blower motor, 4 cm from door lock relay breakout) (i/p harn, near steering column, 4 cm from c201 breakout) (i/p harn, right side of steering column, 18 cm from g200 breakout) (not used) (regal) (w/rap) A/t shift lock control switch A10 Acc B10 Bcm acc fuse 10a Body control module (bcm) Body control module (bcm) (below left side of dash) C201 C206 C5 c (cj3) Crank signal, bcm, cluster fuse 10a Cruise control module Cruise control release switch Cruise control switch Cruise fuse 10a Driver seat heater switch From gen d fuse 21 (diagram 1 of 3) From ignition switch (diagram 2 of 3) From inadv power bus fuse (diagram 1 of 3) From r heated seat fuse diagram (1 of 3) Fuse block, under- hood c1 Fuse block- i/p Fuse block- underhood Fuse- block under- hood Heater- a/c control (cj3) Hvac control module Hvac fuse 10a I/p harn, right side of steering column, 13 cm from instrument cluster breakout) Ign 0,cluster, pcm & bcm fuse 10a Ign1 fuse 5 30a Ign2 fuse 8 60a Ignition switch Inflatable restraint steering wheel module coil Inside rearview mirror Instrument panel cluster (ipc) Left air temperature actuator Left front window switch Left radio control switch Lock Low blower fuse 20a Nca Off Onstar fuse 15a Park lock fuse (regal) 10a Passenger seat heater switch Pnk Power drop connector Power drop fuse 10a Powertrain control module (pcm) Pwr windows pwr sunroof circuit breaker 30a Radio Radio fuse (w/o rap) 2a Radio fuse 2a Rear window defogger relay Red Retained accessory power (rap) relay Right air temperature actuator Run S220 S234 S240 S249 S263 S270 S410 Start Sunroof module To crank signal fuse (diagram 2 of 3) To ign main relay 13 (diagram 3 of 3) To low blower fuse (diagram 2 of 3) To s228 (diagram 3 of 3) Vacuum control assembly (cj2) Vehicle communi- cations interface module W/ electric o/s mirrors W/ fold away mirrors W/ rap W/ sun- roof W/o rap Wind- shield wiper/ washer switch Windshield wiper motor Wiper fuse 25a Power Distribution Wiring Diagram (3 of 3) for Buick Regal GS 2003 List of elements for Power Distribution Wiring Diagram (3 of 3) for Buick Regal GS 2003: 52 (3.1l) (3.1l: fuel injector wiring harn, 2 cm from fule injecto 2 breakout) (3.8l: eng wiring harn, top left of engine, 6 cm from c110 breakout) (3.8l) (i/p harness, right side of dash) A/c clutch relay 15 A/t shift control switch (regal) A11 Abs fuse 10a Air bag fuse 10a Automatic transaxle B12 Body control module (bcm) Brake- to-shift relay Btsi park lock fuse 10a C113 Cluster fuse 10a Crank relay Electronic brake control module (ebcm) Elek ign fuse 25 15a Eng emis fuse 30 10a Evaporative emissions (evap) canister purge solenoid valve Evaporative emissions (evap) canister vent solenoid valve F/inj fuse 28 15a From ign 1 fuse 5 e (diagram 2 0f 3) From ignition switch (diagram 2 of 3) Fuel injector Fuse block- i/p Fuse block- underhood G113 (left of starter, on trans- axle stud) Heated oxygen sensor 1 (ho2s 1) Heated oxygen sensor 1 (ho2s 2) Ign main relay 13 Ignition control module (icm) Inflatable restraint sensing & diagnostic module Instrument panel cluster (ipc) Mass airflow (maf) sensor Nca Oxy sen fuse 29 15a Pcm,bcm u/h relay fuse 10a Pnk Powertrain control module (pcm) Regal vin k S106 S109 S228 Secondary air injection bypass valve solenoid Stoplamp switch Stoplamp switch (century) Supercharger bypass valve (3.8l) Trans fuse 26 10a Turn signal hazard flasher module Turn signals, corn lps fuse 10a
POWER DOOR LOCKS Power Door Locks Wiring Diagram for Buick Regal GS 2003 List of elements for Power Door Locks Wiring Diagram for Buick Regal GS 2003: 42 (body harn, center floor on left side of tunnel) s315 (body harness, below right door speaker, 44cm from power door breakout) s314 All drs lock Battery Battery (b+) Bcm fuse 10a (oldsmobile) Bcm pwr fuse 10a (buick) Body control module (behind left side of dash, left of steering column) Buick Door lock fuse 20a Dr lock sw in Dr unlk sw in Driver door lock switch Driver dr unlk Front passenger door lock switch G201 (left side of steering column) G203 (right side of steering column) G301 (forward of driver's seat) Ground Hot at all times I/p fuse block (behind right of dash in right door opening) Interior lights system Left front door lock Left rear door lock Lock Oldsmobile Pass drs unlk Radio, hvac rfa, cluster, data link fuse 15a Remote control door lock receiver (left side of dash, on right side of instrument cluster) Right front door lock Right rear door lock S202 S211 S269 S283 S303 S504 Serial data Tan Trunk lid rel Trunk/ tailgate/ fuel doors system Unlock
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Buick Regal GS 2003 List of elements for Electrochromic Mirror Wiring Diagram for Buick Regal GS 2003: 37 (main body harness, approximately 9 cm from the rear compt courtesy lamp breakout) s424 (windshield side) ambient sensor C1 b C1 f6 C2 a6 Exterior lights system G402 (right side of rear shelf) Gnd Headlight sensor (mirror side) Hot at all times Hot in run Hvac fuse 10a I/p fuse block (behind right side of dash, in right door opening) Inside rearview mirror (day-night) Interior lights system Low ref Mirror on Nca Off Outside rearview mirror Park/ neutral positon (pnp) switch (on top right rear of transaxle) Pnk R/cmpt rel fuse 7.5a Resets to daytime high reflectivity in reverse S233 S323 S414 Signal Solid state Underhood fuse block (mounted to right strut tower) W/ gps W/ gps w/o gps W/ heated seats W/ sunroof W/o gps W/o heated seats W/o sunroof Power Mirrors Wiring Diagram for Buick Regal GS 2003 List of elements for Power Mirrors Wiring Diagram for Buick Regal GS 2003: 19 Day/night mirror system Driver outside rearview mirror Ecb G301 (left front door sill) Hot at all times I/p fuse block (behind right side of dash, in right door opening) Interior lights system Left mirror Low ref Nca Outside rearview mirror switch Passenger outside rearview mirror Pnk Power mirrors fuse 2a Right mirror Right/ left motor S504 Signal Up/ down motor
POWER SEATS 6-Way Power Seat Wiring Diagram for Buick Regal GS 2003 List of elements for 6-Way Power Seat Wiring Diagram for Buick Regal GS 2003: 26 A nca Back Down Driver seat adjuster motor assembly Driver seat adjuster switch Entire seat For- ward Front height Front passenger seat adjuster motor assembly Front passenger seat adjuster switch Front vertical adjuster motor G301 (left front door sill) Horizontal adjuster motor Hot at all times I/p fuse block Nca Nca b Nca e Nca g Power seats circuit breaker 30a Rear height Rear vertical adjuster motor S303 S326 S330 Tan Heated Seats Wiring Diagram for Buick Regal GS 2003 List of elements for Heated Seats Wiring Diagram for Buick Regal GS 2003: 29 Driver heated seat back element Driver heated seat control module Driver heated seat cushion cover Driver heated seat cushion element Driver heated seat switch Driver heated seat thermistor Front passenger heated seat control module G301 (left front door sill) Ground Hot at all times Hot in run Hvac fuse 10a I/p fuse block Interior lights system Lh heated seat fuse 15a Lo/hi input Nca On input Passenger heated seat back element Passenger heated seat cushion cover Passenger heated seat cushion element Passenger heated seat switch Passenger heated seat thermistor Pnk Rh heated seat fuse 15a S303 S323 S333 Sensor input
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagram for Buick Regal GS 2003 List of elements for Power Top/Sunroof Wiring Diagram for Buick Regal GS 2003: 23 (not used) Battery Close G402 (right side of rear shelf) Gnd Hot in accy, run, & retained accessory power I/p fuse block (behind right side of dash, in right door opening) Ls1 Ls2 Ls3 Open Pos 1 Pos 2 Pos 3 Power windows system Pwr windows pwr sun roof circuit breaker 30a Red S410 S414 Sun roof module (center rear of sun roof) Sun roof motor (center rear of sun roof module) Sun roof switch Sunroof limit switch assembly (in sunroof motor transmission
POWER WINDOWS Power Windows Wiring Diagram for Buick Regal GS 2003 List of elements for Power Windows Wiring Diagram for Buick Regal GS 2003: 31 (body harn, center of vehicle floor) Down Ecb Express Express down module G301 (left front door sill) Hot in acc or run or during rap I/p fuse block (behind right side of dash, in right door opening) Illumination lamp Interior lights system Left front Left front window motor Left front window switch Left rear Left rear window motor Left rear window switch Lock out switch Pwr windows pwr sunroof circuit breaker 30a Right front Right front window motor Right front window switch Right rear Right rear window motor Right rear window switch S303 S307 S410 S504 S604 Tan Tan e
RADIO Radio Wiring Diagram, with Amplifier for Buick Regal GS 2003 List of elements for Radio Wiring Diagram, with Amplifier for Buick Regal GS 2003: 91 (below dash, right side of steering column) Am/fm Ant in Ars Audio amplifier (below rear speaker shelf, in trunk) Audio out Audio sig Bare Battery Computer data lines system E & c data E10 E11 E12 E13 E14 E15 E16 F10 F11 F12 F13 F14 F15 F16 Front window antenna grid Fuse out G203 G203 (below dash, right side of steering column) Ground Hot at all times Hot in acc or run I/p fuse block (behind right side of dash, in right door opening) Illum Inflatable restraint steering wheel control module Interior lights system Left front midrange speaker Left front tweeter speaker Left radio control switches Left rear speaker Lf audio Lf spkr Lf tweeter Lr audio Lr feed Lr rtn Lr spkr Mid- range Mute Nca Radio Radio antenna module (on rear window header panel) Radio fuse 2a Radio prem fuse 15a Radio pwr Radio, hvac, rfa, cel tel, cluster fuse 15a Rap pwr Rear window antenna grid Red Rf audio Rf feed Rf low Rf rtn Rf spkr Rf tweeter Right front midrange speaker Right front tweeter speaker Right radio control switches Right rear speaker Rr audio Rr feed Rr rtn Rr spkr S202 S418 S440 Scan Seek dn Seek up Source Strg ctrl Sub feed Sub rtn Sub- woofer Tan Used not Vehicle interface unit (viu) (in rear compt, mounted to left rear wheelhouse) Vol dn Vol up W/ adaptive reception system W/o adaptive reception system Radio Wiring Diagram, without Amplifier for Buick Regal GS 2003 List of elements for Radio Wiring Diagram, without Amplifier for Buick Regal GS 2003: 73 A c1 A c2 Am/fm Ant in Ars B c2 Battery C1 a C1 b C2 a C2 b Computer data lines system E & c data E10 E11 E12 E13 E14 E15 E16 F10 F11 F12 F13 F14 F15 F16 Front window antenna grid Fuse out G203 (below dash, right side of steering column) G203 (below dash, right side of steering column) Ground Hot at all times Hot in acc or run I/p fuse block (behind right side of dash, in right door opening) Illum Inflatable restraint steering wheel control module Interior lights system Left front door speaker Left front tweeter Left radio control switches Left rear speaker Lf spkr Lr spkr Mute Nca Not used Radio Radio antenna module (on rear window header panel) Radio fuse 2a Radio pwr Radio, hvac, rfa, cel tel, cluster fuse 15a Rap pwr Rear window antenna grid Red Rf spkr Right front door speaker Right front tweeter Right radio control switches Right rear speaker Rr spkr S202 S418 Scan Seek dn Seek up Source Strg ctrl Tan Vol dn Vol up W/ adaptive reception system W/o adaptive reception system
SHIFT INTERLOCK Ignition Lock Solenoid Wiring Diagram for Buick Regal GS 2003 List of elements for Ignition Lock Solenoid Wiring Diagram for Buick Regal GS 2003: 9 A/t shift lock control switch (center of console) C 1995 vftc G200 (behind right side of dash) Hot in off, run or start I/p fuse block (right side of dash, in right door opening) Ignition lock cylinder control actuator Ignition lock cylinder control switch (closed in park) Park lock fuse 10a S230 Shift Interlock Wiring Diagram for Buick Regal GS 2003 List of elements for Shift Interlock Wiring Diagram for Buick Regal GS 2003: 26 (locks shift lever when energized) 1995 vftc c A/t shift lock control solenoid A/t shift lock control switch (under center of console) A/t shift lock sol pwr Automatic transmission Body control module (behind left side of dash, left of steering column) Brake to shift relay (left of i/p fuse block) Btsi park lock fuse 10a Computer data lines system Data line G113 (lower left front of engine) G203 (below dash, right side of steering column) Hot in run, bulb test or start I/p fuse block (right side of dash, in right door opening) Park lock solenoid (unlocks shift lever when energized) Pnk Powertrain control module (left front side of engine compt, in air cleaner assembly) S106 S211 Sig a Sig b Sig c Sig p Stoplamp switch (open when brake pedal depressed) (on brake pedal support) Transmission internal mode switch
STARTING/CHARGING Charging Wiring Diagram for Buick Regal GS 2003 List of elements for Charging Wiring Diagram for Buick Regal GS 2003: 27 (not used) a (not used) c A8 c1 B12 Battery Charge ind Cluster fuse 10a Computer data lines Fusible link (10 ga- rust) G100 (right side of engine compt, at base of battery) G113 (lower left front of eng, on transaxle stud) Gen fuse 10a Generator l Hot at all times Hot in run, or start I/p fuse block (behind right side of dash, in right door opening) Instrument cluster L term monitor c2 P b+ Pnk Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly) Red Ser. data class 2 c1 Solid state Splice pack (s205) (behind data link connector) Starter Underhood fuse block (mounted to right front strut tower) Starting Wiring Diagram for Buick Regal GS 2003 List of elements for Starting Wiring Diagram for Buick Regal GS 2003: 31 Acc B red Battery Bulb test Charging circuit (fusible link) Crank Crank fuse 40a Crank relay Crank signal bcm, cluster fuse 1oa F10 G100 (right side of engine compartment, at base of battery) G113 (lower left front of eng, on transaxle stud, left of starter) Hold- in coil I/p fuse block (behind right side of dash, in right door opening) Ign 1 fuse 30a Ignition switch Lock Nca Off Pcm bcm ign relay fuse 10a Pnk Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly) Pull- in coil Red Run S228 S234 Start Starter Starter enable Underhood fuse block (mounted to right front strut tower)
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram for Buick Regal GS 2003 List of elements for Supplemental Restraints Wiring Diagram for Buick Regal GS 2003: 46 (driver seat adjuster wiring harness, 20 cm from c311 breakout) s330 (inside left door sill, forward of left front seat) g301 A10 A11 A12 A13 A14 A15 A16 A17 A18 Air bag fuse 10a Air bag warning indicator B11 Body control module (bcm) (behind left side of dash, left of steering column) Case ground Class 2 (bcm) serial data Data link connector (dlc) (partial) (under left side of dash, right of steering column) G200 (behind right side of i/p compartment) Ground High control Hot in run, bulb test & start I/p fuse block (behind right side of dash, in right door opening) If equipped Ignition Ignition voltage Inflatable restraint i/p module Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat) Inflatable restraint steering wheel module Inflatable restraint steering wheel module coil Instrument cluster Ipc class 2 serial data Left front inflatable restraint side impact module Left front inflatable restraint side impact sensor (at base of left "b" pillar) Logic Low control Nca Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly) Seat belt switch Seat belt switch (part of driver's seat belt assembly) Serial data class 2 Shorting bar Signal Solid state Splice pack sp205 (behind data link connector) Voltage
TRANSMISSION A/T Wiring Diagram for Buick Regal GS 2003 List of elements for A/T Wiring Diagram for Buick Regal GS 2003: 68 (on transaxle right axle case extension) vehicle speed sensor 1-2 shift sol 2-3 shift sol A/t sensor hi A/t sensor lo Automatic transaxle Automatic transaxle fluid pressure manual valve position switch Automatic transaxle fluid temperature sensor Automatic transaxle input shaft speed sensor B12 Battery in Bcm & instrument cluster Body control module & instrument cluster Brake switch in Cluster fuse 10a Data link connector (below dash, right side of steering column) Ecm fuse 22 10a Ect return Ect sensor in Eng emis fuse 30 10a Engine controls system Engine coolant temperature sensor (top left side of engine) G113 (lower left front of engine on transaxle stud) G113 (lower left front of engine, on transaxle stud) Hot at all times Hot in off, run or start Hot in run or start Hot in run, bulb test or start I/p fuse block (behind right side of dash) Ign 0 fuse 10a Ignition (0) in Ignition (1) in Instrument panel cluster (ipc) Mil ctrl Pc sol hi Pc sol lo Pcm ground Pcm-bcm ign relay fuse 10a Pnk Powertrain control module (left side of engine compt, in air cleaner assembly) Pressure control sol Red S106 S270 Serial data Service engine soon Splice pack sp205 (near dlc) Stop lamp switch (on brake pedal support bracket) Tan Tcc pwm sol Tcc release Tcc release in Tcc/ brake switch Tft sensor gnd Tft sensor in Throttle position sensor (on throttle body) Tp 5v ref Tp sensor in Tps return Tr sw in-a Tr sw in-b Tr sw in-c Tr sw in-p Trans fuse 26 10a Transaxle internal mode switch Underhood fuse block (mounted to right front strut tower) Vss hi (signal) Vss lo (ground)
TRUNK, TAILGATE, FUEL DOOR Trunk Release Wiring Diagram for Buick Regal GS 2003 List of elements for Trunk Release Wiring Diagram for Buick Regal GS 2003: 22 (left of steering column) body control module Class 2 ser data Computer data lines system Door locks fuse 20a G203 (below dash, right side of steering column) G402 (right side of rear shelf) Hot at all times I/p fuse block (behind right side of dash, in right door opening) Instrument panel cluster Interior lights system Keyless ser data Rear compartment lid lock release actuator (near rear compartment lid latch) Rear compartment lid release relay (behind glove box, mounted to under- side of cross-car beam) Rear compartment lid release switch Release rly ctrl Remote control door lock receiver (behind nstrument cluster) S211 S269 S905 Tk ajar sw sig Tk release sw sig Trunk open ind
WARNING SYSTEMS Warning Systems Wiring Diagram for Buick Regal GS 2003 List of elements for Warning Systems Wiring Diagram for Buick Regal GS 2003: 72 door ajar sw sig (below dash, right side of steering column) g203 (close w/key in ignition) (i/p wiring harness, 7 cm from data link connector breakout, toward c201) (i/p wiring harness, midway between headlamp switch breakout & back-up lamp relay breakout) (inside left door sill, forward of left front seat) g301 A10 A11 Accessory voltage Ajar B10 B11 Bcm acc fuse 10a Body control module (bcm) (behind left side of dash, left of steering column) Chime Class 2 serial data Computer data lines system Crank signal, bcm clstr fuse 10a Crank voltage Door unlatch sw sig Driver door lock Driver seat belt switch (part of driver's seat belt assembly) Exterior lps off input G201 (below dash, left side of steering column) G203 (below dash, right side of steering column) Ground Head Headlamp switch Hot at all times Hot in acc & run Hot in run & start Hot in start Hot in unlock run & start I/p fuse block (behind right side of dash, in right door opening) Ign o, cluster, pcm & bcm fuse 10a Ignition 0 voltage Ignition 1 voltage Ignition switch (key in ignition switch) Instrument panel cluster (ipc) Interior lights system Key in ign sw sig Latched Left seat belt switch Left turn Left turn signal Low tire press sw sig Lp park fuse 34 20a Nca Off Park Park brake on signal Park brake switch (on parking brake assembly) Pcm, bcm u/h relay fuse 10a Pnk Power distribution system Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly) Right turn Right turn signal S211 S234 S270 S283 S291 S292 S322 S330 S504 Splice pack sp205 (below dash, right side of steering column, behind data link connector) Tan Tire reset switch (in i/p fuse block) Un- latched Underhood fuse block (mounted to right front strut tower)
WIPER/WASHER Wiper/Washer Wiring Diagram for Buick Regal GS 2003 List of elements for Wiper/Washer Wiring Diagram for Buick Regal GS 2003: 21 (behind right side of dash) g200 (below dash, left side of steering column) g201 Delay Hot in accy or run I/p fuse block (behind right side of dash, in right door opening) Instrument panel cluster Mist Nca Off Red S230 S249 Washer switch Wind- shield washer fluid level switch (in washer fluid reservoir) Windshield washer fluid pump (in washer fluid reservoir) Windshield wiper motor (on left side of firewall, below air inlet screen) Windshield wiper switch Wiper fuse 25a Wiper motor Wiper motor controller Wiper switch
