Diagram sections — 33 (83 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES COOLING FAN CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ELECTRONIC SUSPENSION ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS MEMORY SYSTEMS NAVIGATION 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 Lucerne CXL 2009 List of elements for Automatic A/C Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 69 (in i/p harness, approximately 41 cm (16 in) from branch for hazard lamp switch) j210 (lower left rear of engine) (under driver's seat) g300 (under right front passenger's seat) g304 3.9l 4.6l 5 volt ref A/c compressor clutch (on a/c compressor) Air temp motor ctrl Ambient air temp sens sig Ambient air temperature sensor (on center front of engine compt, on hood latch brace) Backlight lamp ctrl Batt pos vol Batt pos volt Blower motor (behind right side of dash) Blower motor control module (near blower motor) Body control module (bcm) (right of glove box) Computer data lines system Defogger system Driver information center (dic) display Drv air temp dr ctrl a Drv air temp dr ctrl b Drv air temp dr pos sig Evap low temp sens sig Evap temperature sensor (left of blower motor) G112 G115 G300 (under driver's seat) Gmlan serial data Gnd Hot at all times Hvac control module Ign 1 volt Inside air temp sens sig Inside air temperature sensor (under left side of dash, left of steering column) Instrument panel cluster (ipc) Interior lights system J106 J200 J202 J203 J250 J387 L sunload sens sig Led dimming sig Logic Low ref Low speed gmlan serial data Lower mode dr ctrl b Lower mode dr pos sig Mode door control a Mtr fuse 48 10a Pass air temp dr ctrl a Pass air temp dr ctrl b Pass air temp dr pos Passkey fuse 13 10a Pnk Power distribution system R sunload sens sig Rear defog rly ctrl Rear fuse block (below left side of rear seat) Recir dr ctrl a Recir dr ctrl b Recir valve sol sig Recirculation actuator (behind right side of dash, right of blower motor) Speed ctrl Sunload twilight sensor (top center of dash) Tan X4 b Automatic A/C Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Automatic A/C Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 41 (in hvac harness, between evaporator temperature sensor & x202) j227 (in hvac harness, between hvac control module & mode motors) (left side of engine compt) engine control module (ecm) (or tan) 3.9l 4.6l 5v ref 1 87a A/c cltch fuse 4 10a A/c cltch relay 34 A/c refrigerant pressure sensor (near a/c compressor, on hose assembly) Clutch rly ctrl Computer data lines system Driver air temperature actuator (left side of hvac module) Ect sens sig Engine coolant temperature (ect) sensor (3.9l: rear of left cylinder bank) (4.6l: right rear of engine) Fan 1 fuse 27 30a Fan 1 relay Fan 2 fuse 26 30a Fan 2 relay Fan 3 relay Front passenger air temperature actuator (right side of hvac module) G104 (right front corner of engine compt) Gmlan serial data + Gmlan serial data - Hi speed rly ctrl Hot at all times Hot w/ ign relay energized Hot w/ pwr/trn relay energized Hvac/ ipc ign 1 fuse 10 10a J226 Left cooling fan (on left rear side of radiator) Low ref Low speed rly ctrl Mode actuator (on right side of hvac module) Oxy snsr fuse 6 15a Pnk Press sens sig Right cooling fan (on right rear side of radiator) Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Compressor Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Compressor Wiring Diagram for Buick Lucerne CXL 2009: 23 (lower left rear of engine) 3.9l 4.6l 4.6l 3.9l 5 volt ref 1 A/c cltch fuse 4 10a A/c cltch relay A/c compressor clutch (on a/c compressor) A/c refrigerant pressure sensor (near a/c compressor, on hose assembly) Clutch rly ctrl Computer data lines system Engine control module (ecm) (left side of engine compt) G112 G115 Gmlan serial data + Gmlan serial data - Hot at all times Hot w/ pwr/trn relay energized J106 Low ref Sensor signal Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Manual A/C Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Manual A/C Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 52 (in hvac harness, between evaporator temperature sensor & x202) (in hvac harness, between hvac control module & mode motors) (in i/p harness, approximately 41 cm (16 in) from branch for hazard lamp switch) j210 (under right front passenger's seat) g304 5 volt ref A/c compressor clutch (on a/c compressor) A/c high pres reur sw sig Air temp dr ctrl Air temp dr pos sig Air temperature actuator (right side of hvac module) Ambient air temp sens sig Ambient air temperature sensor (on center front of engine compt, on hood latch brace) Backlight lamp ctrl Batt pos vol Batt pos volt Blower fuse 49 40a Blower motor (behind right side of dash) Blower motor control module (near blower motor) Computer data lines system Defogger system Evap low temp sens sig Evap temperature sensor (left of blower motor) G112 (lower left rear of engine) G300 (under driver's seat) Gnd Hot at all times Hvac control module Ign 1 volt Interior lights system J200 J203 J226 J227 J387 Led dimming sig Logic Low mode dr pos sig Low ref Low speed gmlan serial data Lower mode dr ctrl b Mode actuator (on right side of hvac module) Mode dr ctrl a Passkey fuse 13 10a Pnk Power distribution system Rear defog rly ctrl Rear fuse block (below left side of rear seat) Recirculation actuator (behind right side of dash, right of blower motor) Sensor signal Speed ctrl Tan X4 b Manual A/C Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Manual A/C Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 40 (under driver's seat) g300 5v ref 1 87a A/c cltch fuse 4 10a A/c cltch relay 34 A/c refrigerant pressure sensor (near a/c compressor, on hose assembly) Accessory wake up Ambient light sensor (center of dash, in defroster deflector) Body control module (bcm) (right of glove box) Clutch rly ctrl Computer data lines system Ect sens sig Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (rear of left cylinder bank) Fan 1 fuse 27 30a Fan 1 relay Fan 2 fuse 26 30a Fan 2 relay Fan 3 relay G104 (right front corner of engine compt) Gmlan serial data + Gmlan serial data - Hi speed rly ctrl Hot at all times Hot w/ ign relay energized Hot w/ pwr/trn relay energized Hvac/ipc ign 1 fuse 10 10a J104 (in engine harness, approximately 13 cm (5 in) from breakout for x138) J203 J229 Left cooling fan (on left rear side of radiator) Low ref Low speed rly ctrl Oxy snsr fuse 6 15a Pnk Press sens sig Right cooling fan (on right rear side of radiator) Tan Transmission control module (tcm) Underhood fuse block (on right front of engine compt, forward of strut tower)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Anti-lock Brakes Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 51 (base of steering column) (w/ active brake control) steering angle sensor (not used) (on floor pan, left of center console) (w/ active brake control) yaw & lateral acceleration sensor 5v ref Abs fuse 23 50a Abs ind Abs mtr fuse 25 60a Batt pos volt Brake fluid level switch (on master cylinder reservoir) Brake pressure modulator valve (bpmv) Computer data lines system Electronic brake control module (ebcm) (left front corner of engine compt) Electronic power steering system G114 (lower left rear of engine) G300 (under driver's seat) Gmlan (bcm) Gmlan (ebcm) Ground High effort ctrl Hot at all times Hot w/ ign relay energized Hvac/ ipc ign 1 fuse 10 10a Ign Ign 1 volt Instrument panel cluster (ipc) Lateral accel- remitter sig Lateral accelerometer sig Logic Long accel- erometer sig Long accelerometer signal Low effort ctrl Low ref Low reference Pnk Position signal a Position signal b Power distribution system Radio Red Sensor signal Serial data Serial data (+) Serial data (-) Serial data wake up Stability control ind Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle speed signal Vss Yaw rate diagnostic Yaw rate sensor sig Anti-lock Brakes Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Anti-lock Brakes Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 21 (in engine harness, approximately 47 cm (19 in) from right front wheel speed sensor) j114 (in engine harness, approximately 53 cm (21 in) from left front wheel speed sensor) j113 (in engine harness, approximately 53 cm (21 in) from right front wheel speed sensor) j116 Body control module (bcm) (right of glove box) Brake pedal position sensor (top of brake pedal assembly) Computer data lines system J115 (in engine harness, approximately 59 cm (24 in) from left front wheel speed sensor) Left front wheel speed sensor (wss) (on left front brake assembly, on back of hub) Left rear wheel speed sensor (wss) (on left rear brake assembly, on back of hub) Low reference Park brake switch (on top of park brake assembly) Right front wheel speed sensor (wss) (on right front brake assembly, on back of hub) Right rear wheel speed sensor (wss) (on right rear brake assembly, on back of hub) Sensor signal Serial data Serial data (+) Serial data (-) Serial data wake up Supp volt Tan Tan a
ANTI-THEFT Forced Entry Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Forced Entry Wiring Diagram for Buick Lucerne CXL 2009: 71 (if equipped) keyless entry antenna (in body harness, approximately 9 cm (3 in) from branch for x314) j343 (under center of rear package shelf) remote control door lock receiver (rcdlr) (under left rear seat) g301 A11 A12 Battery Body control module (bcm) (right of glove box) Coax Computer data lines system Ddm fuse 22 15a Dr lock act ctrl Dr unlock act ctrl Driver door latch assembly (rear of driver's door) Driver door module (ddm) Drv dr key sw sig Exterior lights system Front passenger door latch assembly (rear of front passenger's door) Front passenger door module (fpdm) G104 (right front corner of engine compt) G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) G406 (left "c" pillar) Gmlan serial data Ground Hood ajar sw sig Hood ajar switch (w/ remote keyless entry) (center front of engine compt) Hood closed sw sig Horn rly ctrl Horns system Hot at all times Ign Instrument panel cluster (ipc) J301 J337 J385 J700 J800 Keyless entry antenna sig Left rear door latch assembly (rear of left rear door) Lf dr ajar sw sig Lf dr open sw sig Lf dr sw low ref Lock relay 63 Logic Low spd gmlan ser data Lr dr ajar sw sig Lr dr lk mtr unlock Lr dr open sw sig Mdls- body fuse 43 10a Nca Park lamp rly ctrl Pdm fuse 29 15a Pwr wdo circuit breaker 25a Rear fuse block (below left side of rear seat) Rf dr ajar sw sig Rf dr open sw sig Rf dr sw low ref Right rear door latch assembly (rear of right rear door) Rr dr ajar sw sig Rr dr lk mtr unlock Security ind Serial data Tan Tan/ red Tan/red Unlock relay 62 Unlock/ lock fuse 14 20a W/ theft deterrent system W/o theft deterrent system Pass-Key Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Pass-Key Wiring Diagram for Buick Lucerne CXL 2009: 23 Acc Acc volt Battery Computer data lines system G300 (under driver's seat) Ground Hot at all times Ign Ignition switch Instrument panel cluster (ipc) J201 J204 Logic Low spd gmlan ser data Off Passkey fuse 13 10a Power distribution system Rear fuse block (below left side of rear seat) Run Security ind Serial data Start Theft deterrent module (tdm) (in steering column)
BODY CONTROL MODULES Body Control Modules Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009 List of elements for Body Control Modules Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009: 57 12v reference Acc wakeup serial data Anti-lock brakes system Backlight lamp control Battery Battery pos voltage Bcm (chmsl) fuse 39 10a Bcm (ctsy) fuse 35 10a Bcm (inadv) fuse 32 10a Bcm (lttn) fuse 25 15a Bcm (rttn) fuse 36 15a Bcm fuse 19 10a Bcm fuse 40 10a Body control module (bcm) (right of glove box) Computer data lines system Cruise control system Cruise ctr ind dimming sig Door locks system Drl relay ctrl E12 Exterior lights system Fog lamp relay ctrl Front fog lamp sw sig G303 (below right side of rear seat) G304 (under right front passenger's seat) Ground Headlamp high beam rly Headlights system Hi gmlan data bus (+) Hi gmlan data bus (-) Hi gmlan serial data up Hood ajar switch sig Hot at all times I/p dimming sig Interior lights system J206 Led dimming signal Left lamp relay ctrl Low gmlan serial data Low reference Out moisture sns sig 1 Out moisture sns sig 2 Pnk Power distribution system R lamp relay ctrl Rear fuse block (below left side of rear seat) Rf turn sig lamp sply Run/crank ign 1 volt Tan Tan/ pnk Tan/pnk Washer relay ctrl Wiper mtr park sw sig Wiper/washer system X2 b11 X2 e2 X3 c8 Body Control Modules Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009 List of elements for Body Control Modules Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009: 49 12v reference 5v ref A/t shift lck sply volt Acc Accessory volt Ambient light sns sig Anti-lock brakes system Battery pos voltage Bcm (dim) fuse 18 10a Body control module (bcm) (right of glove box) Column radio ctrl signal Courtesy lamp ctrl Courtesy lamp sw on sig Cruise control system E12 Exterior lights system Flash to pass sw sig Ground Hazard sw sig Headlamp sw hi beam sig Headlamp sw off sig Headlights system Hot at all times Ignition 1 voltage Ignition switch Interior lights system J201 Key-in switch Left turn sig sw sig Off Off/run crank voltage Park lamp sw on sig Pnk Rear fuse block (below left side of rear seat) Remote radio ctrl acc Right turn sig sw sig Run Set/coast resume/accel Shift interlock sol ctrl Shift interlock system Start Tan Track control sw sig Trunk release ctrl Trunk, tailgate, fuel doors system Washer sw sig Wiper sw high sig Wiper sw low sig Wiper/washer system Body Control Modules Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009 List of elements for Body Control Modules Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009: 47 Backlight lamp control Body control module (bcm) (right of glove box) Computer data lines system Courtesy lamp ctrl Current sensor sig Current sns sply volt Door locks system Dr lock motor lock ctrl Dr lock motor unlock ctrl Exterior lights system Headlights system Hi speed relay ctrl Hood closed sw sig Horn relay ctrl Horns system Interior lights system Lamp rly coil sply volt Lf turn sig sply volt Low beam relay ctrl Low gmlan serial data Lr door ajar sw sig Lr door open sw sig Lr stop/turn lamp sply Master sw lockout sig Master sw lr down sig Master sw lr up sig Master sw rr down sig Master sw rr lockout Master sw rr up sig Park brake switch (on top of park brake assembly) Park brake switch sig Park lamp relay control Power distribution system Power windows system Rap relay coil sply volt Rr door ajar sw sig Rr stop/turn lamp sply Run relay coil ctrl Sensor low reference Starting/charging system Stop lamp sw sig Tan Trunk ajar sw sig Trunk release relay ctrl Trunk, tailgate, fuel doors system Wiper relay control Wiper/washer system
COMPUTER DATA LINES Computer Data Lines Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Computer Data Lines Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 31 (if equipped) right side object sensor (in engine harness, approximately 13 cm (5 in) from breakout for x138) j104 (under center console) inflatable restraint sensing & diagnostic module (sdm) 3.9l (vin 1) 4.6l (vin 9) A6 x3 Acc wake up data Automatic level control module (w/ soft ride suspension system) (forward of left rear tire, on lower control arm) electronic suspension control (esc) module (w/ magnetic ride control) (behind right wheelwell) D (not used) Digital radio receiver (drr) (w/ digital audio system s-band) (at left "d" pillar) Electronic brake control module (ebcm) (left front corner of engine compt) Engine control module (ecm) (left side of engine compt) F (not used) G (not used) Hi spd serial data + Hi spd serial data - J (not used) Left side object sensor Low spd serial data Rear object sensor control module (w/ parking assist) Remote control door lock receiver (rcdlr) (under center of rear package shelf) Serial data wake up Splice pack jx300 (in passenger compt under rear seat near rear fuse block) Tan Transmission control module (tcm) (4.6l: left rear of engine compartment) Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle communication interface module (vcim) (w/ onstar) (on right front of trunk, attached to seat back brace) Vehicle direction alert alarm warning module (w/ lane departure warning sensor indicator) W/ magnetic ride control W/ soft ride suspension system X2 a2 Computer Data Lines Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Computer Data Lines Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 28 (in i/p harness, approximately 12 cm (5 in) from data link connector) j208 Body control module (bcm) (right of glove box) C10 tan Climate control seat module Data link connector (dlc) (under left side of dash) Driver door control module G300 (under driver's seat) Hi spd serial data + Hi spd serial data - Hot at all times Hvac control module Inflatable restraint passenger presence system (pps) module (under front passenger's seat) Instrument panel cluster (ipc) J200 J202 J203 J207 (in i/p harness, approximately 17 cm (7 in) from data link connector) Kw 2000 serial data Low spd serial data Memory seat module (on underside of driver's seat, on seat adjuster frame) Passenger door control module Passkey fuse 13 10a Radio Rear fuse block (below left side of rear seat) Run/acc Serial data wake up Tan Theft deterrent module (tdm) (in steering column)
COOLING FAN Cooling Fan Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Cooling Fan Wiring Diagram for Buick Lucerne CXL 2009: 27 (or tan) 3.9l 4.6l 87a Computer data lines system Ect sens sig Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (3.9l: rear of left cylinder bank) (4.6l: right rear of engine) Fan 1 fuse 27 30a Fan 1 relay Fan 2 fuse 26 30a Fan 2 relay Fan 3 relay G104 (right front corner of engine compt) Gmlan serial data + Gmlan serial data - Hi speed rly ctrl Hot at all times Hot w/ pwr/ trn relay energized Left cooling fan (on left rear side of radiator) Low ref Low speed rly ctrl Oxy snsr fuse 6 15a Pnk Right cooling fan (on right rear side of radiator) Tan Underhood fuse block (on right front of engine compt, forward of strut tower)
CRUISE CONTROL Cruise Control Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Cruise Control Wiring Diagram for Buick Lucerne CXL 2009: 71 (or tan) 3.9l 4.6l 5v ref 5v ref 2 Accelerator pedal position (app) sensor (top of accelerator pedal assembly) App sns sig B2 x2 Batt pos volt Bcm (lttn) fuse 25 15a Body control module (bcm) (right of glove box) Brake pedal position sensor (top of brake pedal assembly) Cancel Computer data lines system Cruise control switch Cruise ind Cruise sw D4 x1 D9 x2 Driver information center (dic) Ecm/ tcm fuse 5 15a Electronic suspension system Engine control module (ecm) (left side of engine compt) G112 (lower left rear of engine) Gmlan (ecm) Gmlan serial data Hot at all times Hot w/ ign relay energized Hvac/ ipc ign 1 fuse 10 10a Ign Ign 1 vol Ind dimming sig Inflatable restraint steering wheel module coil (top of steering column) Instrument panel cluster (ipc) J100 J105 J220 (in steering column harness, between cruise control on/off switch & inflatable restraint steering wheel module coil) Left steering wheel control switch Logic Low ref Nca On ind Oss high sig Oss low sig Pnk Pnk/red Power distribution system Rear fuse block (below left side of rear seat) Res + Res/acc sw sig Sens sig Serial data + Serial data - Serial data bus + Serial data bus - Serial data wake up Set - Sig gnd Sound systems Tac mtr ctrl 1 Tac mtr ctrl 2 Tan Throttle body (top rear of engine) Tp sns 1 sig Tp sns 2 sig Transmission control module (left rear of engine compt) Transmission control module (tcm) (left rear of engine compt) Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle speed sensor (vss) (in transmission) X276 X277
DEFOGGERS Defoggers Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Defoggers Wiring Diagram for Buick Lucerne CXL 2009: 28 Computer data lines system Defogger on ind Driver door module (ddm) Driver outside rearview mirror (in driver's door) Front passenger door module (fpdm) Front passenger outside rearview mirror (in front passenger's door) G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) G406 (left "c" pillar) G407 (right "c" pillar) Ground Heated mirror element Hot at all times Hvac control module J385 Logic Low reference Low spd gmlan serial data Nca Rear defog relay 52 Rear defog rly ctrl Rear defogger switch Rear fuse block (below left side of rear seat) Rear window defogger Rr defog fuse 46 40a Sply voltage Tan/pnk
ELECTRONIC POWER STEERING Electronic Power Steering Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Electronic Power Steering Wiring Diagram for Buick Lucerne CXL 2009: 21 5v ref Abs fuse 23 50a Abs mtr fuse 25 60a Battery Computer data lines system Electronic brake control module (ebcm) (left front corner of engine compt) G114 (lower left rear of engine) Ground High effort ctrl Hot at all times Low effort ctrl Low ref Pos sig a Pos sig b Red Serial data (+) Serial data (-) Steering angle sensor (base of steering column) Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Variable effort steering actuator (left rear of engine compt)
ELECTRONIC SUSPENSION Electronic Damper Control Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Electronic Damper Control Wiring Diagram for Buick Lucerne CXL 2009: 61 (right front wall of luggage compt) g403 Automatic level control (alc) compressor (rear underside of vehicle) Batt Battery voltage C10 nca Comp relay fuse 24 10a Computer data lines system Driver information center (dic) Electronic suspension control (esc) module (behind right wheelwell) G403 (right front wall of luggage compt) Gmlan ser data + Gmlan ser data - Ground Hot at all times Instrument panel cluster (ipc) Ipc class 2 J126 (in body harness, approximately 60 cm (24 in) from left front strut actuator) J127 (in body harness, approximately 65 cm (25 in) from left front strut actuator) J128 (in body harness, approximately 60 cm (24 in) from right front strut tan actuator) J129 (in body harness, approximately 65 cm (25 in) from right front strut actuator) J200 Left front suspension damper (on left front shock absorber assembly) Left front suspension position sensor (on shock absorber assembly) Left rear suspension damper (on left rear shock absorber assembly) Left rear suspension position sensor (on left rear frame rail) Level comp fuse 47 40a Level comp relay Lf damper ctrl Lf damper low ref Lf position sens Lf snsr low ref Lf voltage ref Logic Lr damper ctrl Lr damper low ref Lr position sens Lr snsr low ref Lr voltage ref Mdl-rtd fuse 15 25a Message request Nca Passkey fuse 13 10a Rear fuse block (below left side of rear seat) Relay ctrl Rf damper ctrl Rf damper low ref Rf position sens Rf snsr low ref Rf voltage ref Right front suspension damper (on right front shock absorber assembly) Right front suspension position sensor (on shock absorber assembly) Right rear suspension damper (on right rear shock absorber assembly) Right rear suspension position sensor (on right rear frame rail) Rr damper ctrl Rr damper low ref Rr position sens Rr snsr low ref Rr voltage ref Serial data Solenoid ctrl Tan Electronic Level Control Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Electronic Level Control Wiring Diagram for Buick Lucerne CXL 2009: 28 (forward of left rear tire, on lower control arm) (left rear of luggage compt) g402 (right front wall of luggage compt) g403 Automatic level control (alc) compressor (rear underside of vehicle) Automatic level control module Batt Batt positive Comp relay fuse 24 10a Computer data lines system Driver information center (dic) Gnd Hot at all times Instrument panel cluster (ipc) Ipc class 2 J200 J388 Level comp fuse 47 40a Level comp relay 53 Logic Message request Passkey fuse 13 10a Rear fuse block (below left side of rear seat) Relay ctrl Serial data Serial data + Serial data - Solenoid ctrl Tan
ENGINE PERFORMANCE
3.9L VIN 1 3.9L VIN 1, Engine Performance Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN 1, Engine Performance Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009: 52 (in body harness, approximately 5 cm (2 in) from breakout for electronic suspension control module) (right front wall of luggage compt) g403 (top rear of engine) evaporative emissions (evap) canister purge solenoid valve 5v ref A/c refrigerant pressure sensor (near a/c compressor, on hose assembly) Acc wak ser data Accelerator pedal position (app) sensor (top of accelerator pedal assembly) Air conditioning system App sens 1 lo ref App sens 2 App sensor 1 sig Battery voltage Btsi ctrl Cmprsr rly ctrl Computer data lines system Cooling fan 1 crtl Cooling fan 2 crtl Ecm tcm fuse 5 15a Engine control module (ecm) (left side of engine compt) Fuel level sensor Fuel lvl sens sply volt Fuel pump & sender assembly (top of fuel tank) Fuel pump rly ctrl Fuel tank pressure (ftp) sensor (on fuel pump & sender assembly) Heated oxygen sensor (ho2s) 2 Hi spd ser data Hot at all times Ign Ign volt Instrument panel cluster (ipc) J100 J316 Logic Low ref Maf sig Malfunction ind lp crtl Malfunction indicator lamp Motor Nca Oxygen sens hi Oxygen sens htr crtl Oxygen sens lo Pnk Press sens sig Pressure ind low engine oil Pwr/train rly Rear fuse block (below left side of rear seat) Shift interlock system Starter rly coil Starting/charging system Tan Tan/pnk 3.9L VIN 1, Engine Performance Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN 1, Engine Performance Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009: 42 (lower left front of engine compt) secondary air injection (air) pump 5v ref Air pump fuse 22 50a Air pump relay Air sol fuse 5 15a Air sol relay Ap rly crtl Brk lt crtl Ecm/ crnk fuse 1 15a Ecm/ pcm fuse 9 10a Emis dev fuse 7 15a Engine control module (ecm) (left side of engine compt) Engine oil pressure (eop) sensor (left rear of engine) Evaporative emission (evap) canister vent solenoid valve (below rear of vehicle, on evap canister) Exterior lights system F/pmp fuse 1 20a F10 Fuel inj even fuse 3 15a Fuel inj odd fuse 2 15a Fuel pump relay G112 (lower left rear of engine) G114 (lower left rear of engine) G301 (under left rear seat) Hot at all times Hot w/ ignition relay energized Iat sens sig Ign volt J105 J108 Manifold absolute pressure (map) sensor (top center of engine) Mass air flow (maf)/intake air temperature (iat) sensor (left side of engine compt, in air intake tube) Oxy snsr fuse 6 15a Pnk Pwr/trn relay 29 Rear fuse block (below left rear seat) Safty sw sig Secondary air injection (air) pump check valve (top center of right camshaft cover) Sol can fuse 34 10a Starting/ charging system Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Vent sol crtl 3.9L VIN 1, Engine Performance Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN 1, Engine Performance Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009: 63 (1, 3 & 5 : top right side of engine) (2, 4 & 6 : top left side of engine) fuel injectors (center front of engine) camshaft position (cmp) sensor (lower left rear of engine) g115 (right front of engine) camshaft position (cmp) actuator solenoid valve 5v ref Air sol 5v ref Air sol crtl Air sol low ref Air sol press Canister purge sol Ckp sens sig Cmp pos sens sig Crankshaft position (ckp) sensor (lower right side of engine) Ctrl ic1 Ctrl ic2 Ctrl ic3 Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (rear of left cylinder bank) G112 (lower left rear of engine) Gen duty cycle Gen on sig Gnd Heated oxygen sensor (ho2s) 1 Ho2s low sig Ic 1 ctrl Ic 2 ctrl Ic 3 ctrl Ignition control module (icm) (top of right cylinder bank) Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl J105 J109 Knock sensor (ks) 1 (left side of engine, near starter) Knock sensor (ks) 2 (right side of engine, below exhaust manifold) Ks b1 low ref Ks b1 sig Ks b2 low ref Ks b2 sig Logic Low ref Map sens 5v ref Map sens low ref Map sens sig Nca O2 sens hi O2 sens htr crtl Phaser ctrl Ref low Sens sig Starting/charging system Tan Tan/pnk Throttle body (top rear of engine) Throttle ctrl (cl) Throttle ctrl (op) Tp sens Tp sens 1 sig Tp sens 2 Volt ign
3.9L VIN M 3.9L VIN M, Engine Performance Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN M, Engine Performance Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009: 52 (in body harness, approximately 5 cm (2 in) from breakout for electronic suspension control module) (right front wall of luggage compt) g403 (top rear of engine) evaporative emissions (evap) canister purge solenoid valve 5v ref A/c refrigerant pressure sensor (near a/c compressor, on hose assembly) Acc wak ser data Accelerator pedal position (app) sensor (top of accelerator pedal assembly) Air conditioning system App sens 1 lo ref App sens 2 App sensor 1 sig Battery voltage Btsi ctrl Cmprsr rly ctrl Computer data lines system Cooling fan 1 crtl Cooling fan 2 crtl Ecm tcm fuse 5 15a Engine control module (ecm) (left side of engine compt) Fuel level sensor Fuel lvl sens sply volt Fuel pump & sender assembly (top of fuel tank) Fuel pump rly ctrl Fuel tank pressure (ftp) sensor (on fuel pump & sender assembly) Heated oxygen sensor (ho2s) 2 Hi spd ser data Hot at all times Ign Ign volt Instrument panel cluster (ipc) J100 J316 Logic Low ref Maf sig Malfunction ind lp crtl Malfunction indicator lamp Motor Nca Oxygen sens hi Oxygen sens htr crtl Oxygen sens lo Pnk Press sens sig Pressure ind low engine oil Pwr/train rly Rear fuse block (below left side of rear seat) Shift interlock system Starter rly coil Starting/charging system Tan Tan/pnk 3.9L VIN M, Engine Performance Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN M, Engine Performance Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009: 42 (lower left front of engine compt) secondary air injection (air) pump 5v ref Air pump fuse 22 50a Air pump relay Air sol fuse 5 15a Air sol relay Ap rly crtl Brk lt crtl Ecm/ crnk fuse 1 15a Ecm/ pcm fuse 9 10a Emis dev fuse 7 15a Engine control module (ecm) (left side of engine compt) Engine oil pressure (eop) sensor (left rear of engine) Evaporative emission (evap) canister vent solenoid valve (below rear of vehicle, on evap canister) Exterior lights system F/pmp fuse 1 20a F10 Fuel inj even fuse 3 15a Fuel inj odd fuse 2 15a Fuel pump relay G112 (lower left rear of engine) G114 (lower left rear of engine) G301 (under left rear seat) Hot at all times Hot w/ ignition relay energized Iat sens sig Ign volt J105 J108 Manifold absolute pressure (map) sensor (top center of engine) Mass air flow (maf)/intake air temperature (iat) sensor (left side of engine compt, in air intake tube) Oxy snsr fuse 6 15a Pnk Pwr/trn relay 29 Rear fuse block (below left rear seat) Safty sw sig Secondary air injection (air) pump check valve (top center of right camshaft cover) Sol can fuse 34 10a Starting/ charging system Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Vent sol crtl 3.9L VIN M, Engine Performance Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009 List of elements for 3.9L VIN M, Engine Performance Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009: 63 (1, 3 & 5 : top right side of engine) (2, 4 & 6 : top left side of engine) fuel injectors (center front of engine) camshaft position (cmp) sensor (lower left rear of engine) g115 (right front of engine) camshaft position (cmp) actuator solenoid valve 5v ref Air sol 5v ref Air sol crtl Air sol low ref Air sol press Canister purge sol Ckp sens sig Cmp pos sens sig Crankshaft position (ckp) sensor (lower right side of engine) Ctrl ic1 Ctrl ic2 Ctrl ic3 Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (rear of left cylinder bank) G112 (lower left rear of engine) Gen duty cycle Gen on sig Gnd Heated oxygen sensor (ho2s) 1 Ho2s low sig Ic 1 ctrl Ic 2 ctrl Ic 3 ctrl Ignition control module (icm) (top of right cylinder bank) Inj 1 ctrl Inj 2 ctrl Inj 3 ctrl Inj 4 ctrl Inj 5 ctrl Inj 6 ctrl J105 J109 Knock sensor (ks) 1 (left side of engine, near starter) Knock sensor (ks) 2 (right side of engine, below exhaust manifold) Ks b1 low ref Ks b1 sig Ks b2 low ref Ks b2 sig Logic Low ref Map sens 5v ref Map sens low ref Map sens sig Nca O2 sens hi O2 sens htr crtl Phaser ctrl Ref low Sens sig Starting/charging system Tan Tan/pnk Throttle body (top rear of engine) Throttle ctrl (cl) Throttle ctrl (op) Tp sens Tp sens 1 sig Tp sens 2 Volt ign
4.6L VIN 9 4.6L VIN 9, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Engine Performance Wiring Diagram (1 of 5) for Buick Lucerne CXL 2009: 57 (left rear of engine compt) transmission control module (tcm) (lower left rear of engine) g112 (right of glove box) body control module (bcm) (under driver's seat) g300 5v ref 1 5v ref 2 A/c com clutch rly Acc wake up serial data Accelerator pedal position (app) sensor (top of accelerator pedal assembly) Accessory volt Accessory wake up Air conditioning system App sensor 1 sig App sensor 2 sig Battery pos volt Cooling fans system Ecm/ pcm fuse 10a Ecm/crnk fuse 1 15a Engine control module (ecm) (left side of engine compt) Engine oil pressure (eop) switch (near oil filter) Evap canister vent Exterior lights system Fan relay ctrl Fuel pump rly ctrl Fuel tank pressure (ftp) sensor (on fuel pump & sender assembly) G112 (lower left rear of engine) Gnd Hot at all times Ign Ign 1 volt run/crank Ign relay Ignition 1 voltage Instrument panel cluster (ipc) J104 (in engine harness, approximately 13 cm (5 in) from breakout for x138) J105 J203 Logic Low reference Malfunction indicator lamp (mil) Mil control Oss hi sig Oss low sig Oxy snsr fuse 6 15a Pnk Pressure sns sig Primary fuel level Pwr/train relay Pwr/trn relay Rly ctrl Serial data acc wake up Starter rly coil Starting/ charging system Stop lamp sw sig Tan To fuse pwr emis dev fuse 7 (diagram 4 of 5) Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle speed sensor (vss) (in transmission) 4.6L VIN 9, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Engine Performance Wiring Diagram (2 of 5) for Buick Lucerne CXL 2009: 42 (below rear of vehicle, on evap canister) evaporative emission (evap) canister vent solenoid valve (near a/c compressor, on hose assembly) a/c refrigerant pressure sensor (top of fuel tank) fuel pump & sender assembly (under left rear seat) 5v ref 5v ref 1 Acc Air pump relay ctrl Cooling fans system Ctrl bank 2 sns 1 Ecm/tcm fuse 5 15a Engine control module (ecm) (left side of engine compt) Evap canister purge F/pmp fuse 1 20a F10 Field duty cycle sig Fuel pump relay G301 G403 (right front wall of luggage compartment) Hot at all times Ignition switch J100 J201 J316 (in body harness, approximately 5 cm (2 in) from breakout for electronic suspension control module) Low reference Low speed cooling Off Park/neutral Pnk Rear fuse block (below left side of rear seat) Ref bank 2 sns 1 Reverse lockout sol Run Serial data bus - Shift interlock system Sol can fuse 10a Start Starting/ charging system Tan Transmissions system Turn on signal Volt bank 2 sns 1 4.6L VIN 9, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Engine Performance Wiring Diagram (3 of 5) for Buick Lucerne CXL 2009: 29 (lower left front of engine compt) secondary air injection (air) pump (lower left rear of engine) (top center of right camshaft cover) secondary air injection (air) check valve (top rear of engine) evaporative emission (evap) canister purge solenoid valve Air injection pos Air pump fuse 22 50a Air pump relay Air sol fuse 5 15a Air sol relay Computer data lines system Ect sensor sig Engine control module (ecm) (left side of engine compt) Engine coolant temperature (ect) sensor (right rear of engine) G115 Heated oxygen sensor (ho2s) bank 2 sensor 1 (on left exhaust manifold) Hot at all times Hot w/ pwr/train relay energized Ignition coil/module 2 (top left side of engine) J106 Manifold absolute pressure (map) sensor (on top rear of engine) Map sensor sig Nca Oil press sw sig Pnk Refrig pre sen sig Serial data bus + Spark plug Tan Underhood fuse block (on right front of engine compt, forward of strut tower) 4.6L VIN 9, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Engine Performance Wiring Diagram (4 of 5) for Buick Lucerne CXL 2009: 27 (below exhaust gas recirculation (egr) valve) (in even bank ignition coil harness, between x139 & ignition coil/module 8) (on top right rear of engine) exhaust gas recirculation (egr) valve Emis dev fuse 7 15a From ecm/crnk fuse 1 (diagram 1 of 5) Fuel inj even fuse 3 15a Fuel inj odd fuse 2 15a x3 Fuel injectors (top left side of engine) Fuel injectors (top right side of engine) G100 Ignition coil/module (top left side of engine) Ignition coil/module (top right side of engine) J102 J109 J110 J131 J133 J135 J142 J144 J146 (in odd bank ignition coil harness, between x140 & ignition coil/module 7) Nca Pnk Pnk/tan Red Spark plug Underhood fuse block (on right front of engine compt, forward of strut tower) 4.6L VIN 9, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Engine Performance Wiring Diagram (5 of 5) for Buick Lucerne CXL 2009: 57 5v ref 1 5v ref 2 Camshaft position (cmp) sensor (on right front of engine) Ckp sensor sig Cmp sensor sig Crankshaft position (ckp) sensor (top center of engine) Egr sol high ctrl Egr sol low ctrl Egr valve pos sig Engine control module (ecm) (left side of engine compartment) Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 G112 (lower left rear of engine) Ground Heated oxygen sensor (ho2s) 2 Heated oxygen sensor (ho2s) bank 1 sensor 1 (on right exhaust manifold) Heater low ctrl Ho2s 2 high sig Ho2s 2 low sig Iat sensor sig Ic 1 control Ic 2 ctrl Ic 3 control Ic 4 control Ic 5 ctrl Ic 6 ctrl Ic 7 ctrl Ic 8 control Ignition 1 voltage J105 Knock sensor (ks) 1 (top right side of engine) Knock sensor (ks) 2 (top left side of engine) Knock sns 1 sig Knock sns 2 sig Low ref Low reference Maf sensor sig Mass air flow (maf)/ intake air temperature (iat) sensor (left side of engine compartment, in air intake tube) Nca Pnk Pnk/red Pnk/tan Ref bank 1 sen 1 Tac motor ctrl 1 Tac motor ctrl 2 Tan Tan/pnk Throttle body (top rear of engine) Tp sensor 1 sig Tp sensor 2 sig Volt bank 1 sns 1
EXTERIOR LIGHTS Exterior Lamps Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 63 3.9l 4.6l 5v ref Auto Backup lamp circuit Batt pos volt Body control module (bcm) (right of glove box) Brake pedal position sensor (top of brake pedal assembly) Center high mounted stop lamp (chmsl) Chmsl sply volt Computer data lines system Driver outside rear view mirror (in driver's door) Engine control module (ecm) (left side of engine compt) Front passenger outside rear view mirror (in front passenger's door) G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) G403 (right front wall of luggage compt) Hazard sw sig Hazard switch Head Headlamp switch Hot at all times If equipped Interior lights system J202 J204 J206 Left backup lamp Left tail lamp Left turn Left turn sw sig Lf crn lamp fuse 20 10a Lf turn Lf turn sig lmp sply Lh corn lmp rly ctrl Logic Low ref Lr stop/turn lmp sply Off Park Prk lmp rly ctrl Prk lmp sw on sig Rf crn lamp fuse 21 10a Rf turn Rf turn sig lmp sply Rh corn lmp rly ctrl Right backup lamp Right tail lamp Right turn Right turn sw sig Rr stop/turn lmp sply Sens sig Serial data Sig lmp x1 sply volt Stop lmp sw sig Tan Tan/pnk Transmission control module (tcm) (4.6l: left rear of engine compt) Trn/sig pcb relay Turn signal/ multi-function switch Underhood fuse block (on right front of engine compt, forward of strut tower) Underhood fuse block (on right front of engine compt, forward of strut tower) x3 Exterior Lamps Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 49 (in body harness, approximately 12 cm (5 in) from breakout for battery current sensor) j326 (left rear of luggage compt) g402 (right front wall of luggage compt) g403 B11 Bcm (chmsl) fuse 39 10a Bcm (ctsy) fuse 35 10a Bcm (lttn) fuse 25 15a Bcm (rttn) fuse 36 15a Computer data lines system E12 G104 (right front corner of engine compt) G300 (under driver's seat) G403 (right front wall of luggage compt) Gmlan (bcm) Hot at all times Instrument cluster (ipc) J203 J323 (in body harness, approximately 15 cm (6 in) from branch for rear fuse block) J324 (in body harness, approximately 5 cm (2 in) from breakout for right inflatable restraint roof rail module) J402 J404 (in rear fascia harness, approximately 13 cm (5 in) from breakout for license lamps) Left front cornering lamp Left front headlamp assembly Left front marker lamp Left license lamp Left park/ turn signal lamp Left rear marker lamp Left tail lamp assembly Left tail/stop & turn signal lamp Left turn ind Logic Park lp-lt fuse 2 10a Park lp-lt fuse 4 10a Park lp-lt relay 58 Rear fuse block (below left side of rear seat) Right front cornering lamp Right front headlamp assembly Right front marker lamp Right license lamp Right park/ turn signal lamp Right rear marker lamp Right tail lamp assembly Right tail/stop & turn signal lamp Right turn ind Serial data Tan Tan/pnk Trailer stop/turn Underhood fuse block (on right front of engine compt, forward of strut tower)
3.9L VIN 1 3.9L VIN 1, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 3.9L VIN 1, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009: 32 Automatic transmission Automatic transmission internal mode switch Backup Backup lmp sply Batt pos volt Bcm (chmsl) fuse 39 10a Body control module (bcm) (right of glove box) Bus + Bus - Code a Code b Computer data lines system Exterior lamps circuit G112 (lower left rear of engine) G403 (right front wall of luggage compt) Hot at all times Inside rearview mirror J325 (in body harness, approximately 7 cm (3 in) from breakout for battery current sensor) Left backup lamp Left tail lamp Lmp sply volt Logic Rear fuse block (below left side of rear seat) Right backup lamp Right tail lamp Serial data bus + Serial data bus - Sig a Sig b Tan Transmission control module (tcm) X2 e12
3.9L VIN M 3.9L VIN M, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 3.9L VIN M, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009: 32 Automatic transmission Automatic transmission internal mode switch Backup Backup lmp sply Batt pos volt Bcm (chmsl) fuse 39 10a Body control module (bcm) (right of glove box) Bus + Bus - Code a Code b Computer data lines system Exterior lamps circuit G112 (lower left rear of engine) G403 (right front wall of luggage compt) Hot at all times Inside rearview mirror J325 (in body harness, approximately 7 cm (3 in) from breakout for battery current sensor) Left backup lamp Left tail lamp Lmp sply volt Logic Rear fuse block (below left side of rear seat) Right backup lamp Right tail lamp Serial data bus + Serial data bus - Sig a Sig b Tan Transmission control module (tcm) X2 e12
4.6L VIN 9 4.6L VIN 9, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Backup Lamps Wiring Diagram for Buick Lucerne CXL 2009: 32 (in body harness, approximately 7 cm (3 in) from breakout for battery current sensor) j325 (lower left rear of engine) g112 Automatic transmission Backup Backup lmp sply Batt pos volt Bcm (chmsl) fuse 39 10a Body control module (bcm) (right of glove box) Bus + Bus - Computer data lines system E12 x2 Exterior lamps circuit G403 (right front wall of luggage compt) Hot at all times Inside rear view mirror J105 Left backup lamp Left tail lamp Lmp sply volt Logic Nca Rear fuse block (below left side of rear seat) Right backup lamp Right tail lamp Serial data bus + Serial data bus - Sig a Sig b Tan Transmission control module (left rear of engine compt) Transmission internal mode switch
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 4) for Buick Lucerne CXL 2009 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Buick Lucerne CXL 2009: 54 (3.9l) ignition control module (icm) (4.6l) a/c compressor clutch (4.6l) secondary air injection (air) pump (if equipped) sunroof control module (on right front of engine compartment, forward of strut tower) underhood fuse block (w/ magnetic ride control) electronic suspension control (esc) module (w/ side obstacle detection sensor indicator) left side object sensor (w/ side obstacle detection sensor indicator) right side object sensor 3.9l & pzev A x2 Air pump relay Automatic level control (alc) compressor Battery Body control module (bcm) Electronic brake control module (ebcm) Fuel pump & sender assembly G100 (4.6l) (below exhaust gas recirculation (egr) valve) G101 (left front corner of engine compartment) G114 (lower left rear of engine) G115 (lower left rear of engine) G303 (below right side of rear seat) G403 (right front wall of luggage compartment) G406 (at left "c" pillar) G407 (at right "c" pillar) Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 J106 (in engine harness, approximately 7 cm (3 in) from branch for throttle body assembly) J108 (in engine harness, approximately 10 cm (4 in) from breakout for automatic transmission) J133 (in even bank ignition coil harness, between x139 & ignition coil/module 2) J144 J385 (in body harness, approximately 10 cm (4 in) from g306) J402 (in rear fascia harness, approximately 7 cm (3 in) from breakout for license lamps) Keyless entry antenna Left license lamp Left tail lamp Nca Rear window defogger Right license lamp Right tail lamp Right tail/ stop & turn signal lamp Secondary air injection (air) pump Solenoid Windshield wiper motor Wpr hi pcb relay X1 b X2 e2 X900 X901 Ground Distribution Wiring Diagram (2 of 4) for Buick Lucerne CXL 2009 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Buick Lucerne CXL 2009: 52 (on right front of engine compartment, forward of strut tower) underhood fuse block (w/ heated nozzle) windshield washer solvent heater (w/ remote keyless entry start/ extended range) hood ajar switch 12 cm (5 in) from breakout for x800) 14 cm (6 in) from branch for throttle body assembly) Approximately 6 cm (2 in) from breakout for a/t shift lock control solenoid) Automatic transmission Automatic transmission shifter lever Blower motor control module Body control module (bcm) C x1 Center console accessory power outlet Cigar lighter D x2 Engine control module (ecm) Engine oil pressure (eop) switch Fan 3 relay 32 For i/p compartment lamp) Front passenger door module (fpdm) G104 (right front corner of engine compartment) G112 (4.6l) (lower left rear of engine) G302 (under right front passenger's seat) G304 (under right front passenger's seat) Headlamp switch Horn assembly I/p compartment lamp Ign relay Inflatable restraint sensing & diagnostic module (sdm) J383 (in center console harness, between breakout for a/t shift lock control solenoid & breakout for auxiliary hvac control module) J387 K x175 Left front fog lamp Left headlamp Mass air flow (maf)/ intake air temperature (iat) sensor Nca Right engine cooling fan Right front door courtesy lamp Right front fog lamp Right headlamp Right rear door latch Right rear window switch Strtr relay 30 To passenger seat adjuster switch (diagram 3 of 4) Traction control switch Transmission control module (tcm) W/ custom bucket seat Windshield washer fluid level switch Windshield washer fluid pump Wpr pcb relay X113 X114 X3 c6 Ground Distribution Wiring Diagram (3 of 4) for Buick Lucerne CXL 2009 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Buick Lucerne CXL 2009: 48 (w/ custom bucket seat & non bucket individual front seat) ignition lock cylinder control solenoid (w/ front cooling seat heater) seat climate control module (w/ memory seat adjuster) memory seat module (msm) (w/ non bucket individual front seat) traction control switch Ambient light sensor Approximately 8 cm (4 in) from breakout for inflatable restraint seat position sensor) Ashtray lamp Brake fluid level switch Cigar lighter Data link connector (dlc) Driver door module (ddm) Driver information display switch Driver seat adjuster switch From splice j387 (diagram 2 of 4) Front accessory power outlet G300 (under driver's seat) Hazard switch Heated steering wheel control module Horn switch Hvac control module Inflatable restraint passenger presence system (pps) module Inflatable restraint steering wheel module coil Inside air tempe- rature sensor Instrument panel cluster (ipc) J203 (in i/p harness, approximately 36 cm (14 in) from breakout for hvac module) J306 (in right front seat harness, approximately 7 cm (3 in) from breakout for passenger seat belt switch) Left front door courtesy lamp Left steering wheel control switch Lighter) Nca Passenger seat adjuster switch Passenger seat lumbar adjuster switch Restraint steering wheel module coil) Right steering wheel control switch Sunload sensor Theft deterrent module (tdm) Turn signal/ multi-function switch W/ 8-way passenger seat adjuster W/ automatic, auxiliary temperature air conditioner W/ electronic controls front air conditioner W/ heated nozzles W/ non bucket individual front seat W/o 8-way passenger seat adjuster X205 & turn signal/multi-function switch connector c4) X276 X276 d X277 X277 d Ground Distribution Wiring Diagram (4 of 4) for Buick Lucerne CXL 2009 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Buick Lucerne CXL 2009: 37 (below left side of rear seat) rear fuse block (if equipped) windshield outside moisture sensor (w/ digital audio system s-band) digital radio receiver (w/ lane departure warning) vehicle direction alert alarm warning module (w/ onstar) vehicle communication interface module (vcim) (w/ rear parking assist) rear object sensor control module (w/ suspension system) automatic level control (alc) module Audio amplifier Center high mounted stop lamp (chmsl) Fuel pump relay 59 G110 (left front of engine) G111 (right front of engine) G301 (under left rear seat) G305 (under driver's seat) G402 (left rear of luggage compartment) Garage door opener (gdo) Inflatable restraint i/p module indicator Inside rearview mirror (isrvm) J312 (in headliner harness, approximately 10 cm (4 in) from branch for x321) J313 J365 (in body harness, approximately 5 cm (2 in) from audio amplifier connector c1) Left rear door latch Left rear window switch Left sunshade Left tail/stop & turn signal lamp Lock relay 63 Radio Rap-hc relay 70 Rear compartment lid latch Remote control door lock receiver (rcdlr) Right sunshade Rr defog relay 52 Run relay 64 Sunroof switch Trk rel relay 67 Unlock relay 62 W/ premium audio branded & amplifier
HEADLIGHTS Headlights Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Headlights Wiring Diagram for Buick Lucerne CXL 2009: 74 (on top of park brake assembly) park brake switch Body control module (bcm) (right of glove box) C (not used) C12 Computer data lines system Data Drl fuse 16 15a Drl relay 65 Drl rly ctrl Exterior lights system F10 Flash to pass sw sig Fog lamp pcb relay Fog lamp rly ctrl Fog lamps ind Fog lp fuse 14 10a Front fog lamp switch Frt fog lamp sw sig Ftp G104 (right front corner of engine compt) G300 (under driver's seat) G304 (under right front passenger's seat) Gmlan (bcm) Gmlan serial data Head Headlamp sw off sig Headlamp sw on sig Headlamp switch High High beam ind High beam pcb relay High beam rly ctrl Highbeam signal Hot at all times Hvac control module Ign Instrument panel cluster (ipc) J124 (in forward lamp harness, approximately 26 cm (11 in) from x114) J203 J204 J206 Left front fog lamp Left headlamp Left high beam headlamp Left low beam headlamp Light sensor sig Lo beam pcb relay Logic Low Low beam rly ctrl Lt hi beam fuse 16 10a Lt lo beam fuse 17 20a Off Park auto Park brk sw sig Park lamp relay ctrl Park lamp sw on sig Pnk Rear fuse block (below left side of rear seat) Right front fog lamp Right headlamp Right high beam headlamp Right low beam headlamp Rt hi beam fuse 15 10a Rt lo beam fuse 18 20a Serial Serial data Sunload twilight sensor (w/ automatic a/c) (top center of dash) ambient light sensor (w/ manual a/c) (center of dash, in defroster deflector) Turn signal/ multi-function switch Underhood fuse block (on right front of engine compartment, forward of strut tower) W/ automatic a/c W/ manual a/c Washer sw sig Wiper/washer system
HORN Horn Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Horn Wiring Diagram for Buick Lucerne CXL 2009: 19 (in right front seat harness, approximately 7 cm (3 in) from breakout for passenger seat adjuster switch toward x314) j322 (right front corner of engine compartment) g104 (under driver's seat) g300 Body control module (bcm) (right of glove box) High note horn Horn assembly (left front of engine compartment) Horn fuse 12 15a Horn pcb relay Horn rly ctrl Horn switch Hot at all times Inflatable restraint steering wheel module coil (top of steering column) J219 Low note horn Nca Tan Underhood fuse block (on right front of engine compartment, forward of strut tower) X276 X277
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 74 Abs ind Air bag ind Audible alarm Automatic a/c Backlighting ctrl Batt pos volt Brake ind Charging ind Computer data lines system Cruise ind Driver information center (dic) Drv info center select menu sw sig Drv info center sw low ref Drv info center sw sig Engine controls system Engine coolant gauge Engine coolant temperature ind F5 x2 Fog lamps ind Fuel level gauge G300 (under driver's seat) Gmlan Gmlan (bcm) Gmlan (ebcm) Gmlan (ecm) Gmlan (sdm) Gnd Ground Heated washer fluid ind ctrl High beam ind Hot at all times Hot w/ ign relay 36 energized Hvac/ ipc ign1 fuse 10 10a Ign Ign 1 volt Illumination Instrument panel cluster (ipc) Interior lights system Ipc J200 J202 J203 J229 Left turn ind Logic Low oil ind Low spd gmlan serial data Low tire pressure ind Low washer fluid ind ctrl Malfunction ind Manual a/c Off ind ctrl Pass air bag Pass air bag on ind ctrl Pass seat belt ind Passkey fuse 13 10a Pnk Pnk/tan Power distribution system Rear fuse block (below left side of rear seat) Right turn ind Seat belt ind Security ind Speedometer (mph/km/h) Tachometer Tan Trip reset sw sig Trip/ odometer Trip/odometer ctrl Trip/reset Underhood fuse block (on right front of engine compt, forward of strut tower) Vdc ind Wiper/washer system X2 b2 Instrument Cluster Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 47 (rear of driver's door) driver door latch assembly (rear of front passenger's door) front passenger door latch assembly 3.9l 4.6l Body control module (bcm) (right of glove box) Brake fluid level switch (on master cylinder reservoir) Computer data lines system Driver door module (ddm) Driver information display switch Engine control module (ecm) (left side of engine compt) Engine controls system Engine oil pressure (eop) switch (4.6l) (near oil filter) Front passenger door module (fpdm) Fuel level sens sig Fuel pump & sender assembly (top of fuel tank) G112 (lower left rear of engine) G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) Gmlan serial data+ Gmlan serial data- Interior lights system J105 J202 J316 (in body harness, approximately 5 cm (2 in) from breakout for electronic suspension control module) J700 J800 Left rear door latch assembly (rear of left rear door) Logic Low ref Low spd gmlan serial data Lr dr ajar sw sig Oil press sw sig Park brake sw sig Park brake switch (on top of park brake assembly) Persona- lization Pnk Rf dr ajar Right rear door latch assembly (rear of right rear door) Rr dr ajar sw sig Set/ reset Sw sig lf dr sw low ref Tan Trip/ fuel Vehicle information W/ theft deterrent system W/o theft deterrent system
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Courtesy Lamps Wiring Diagram for Buick Lucerne CXL 2009: 54 (in body harness, approximately 14 cm (6 in) from breakout for x325) j329 (in body harness, approximately 5 cm (2 in) from breakout for audio amplifier connector c1) j372 (left rear of luggage compt) (under right front passenger's seat) 12 volt ref Batt pos volt Bcm (ctsy) fuse 35 10a Bcm (inadv) fuse 32 10a Body control module (bcm) (right of glove box) Computer data lines system Court lamp ctrl Courtesy lamp Driver door latch assembly (rear of driver's door) Driver door module (ddm) Front passenger door latch assembly (rear of front passenger's door) Front passenger door module (fpdm) G300 (under driver's seat) G301 (under left rear seat) G304 G304 (under right front passenger's seat) G402 Hot at all times I/p compartment lamp J202 J206 J211 (in i/p harness, approximately 28 cm (11 in) from breakout for body control module connector) J313 J328 (in headliner harness, approximately 20 cm (8 in) from branch for x321) J331 (in ip harness, between body control module & front door courtesy lamps) J343 (in body harness, approximately 9 cm (3 in) from branch for x314) J700 J800 Left front door courtesy lamp Left rear door latch assembly (rear of left rear door) Left roof rail reading lamp Left sunshade Low ref Low spd gmlan serial data Low speed gmlan serial data Lr door open sw sig Off Open sw sig Rear compartment courtesy lamp Rear compartment lid latch (center rear of luggage compt) Rear fuse block (below left side of rear seat) Right front door courtesy lamp Right rear door latch assembly (rear of right rear door) Right roof rail reading lamp Right sunshade Tan/ pnk Tan/pnk W/ theft deterrent system W/o theft deterrent system X2 b11 Instrument Illumination Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Instrument Illumination Wiring Diagram for Buick Lucerne CXL 2009: 67 (in i/p harness, approximately 21 cm (8 in) from branch for hazard lamp switch toward branch for hvac module) j212 (under 12 volt ref Ashtray lamp Auto park Automatic air conditioning Backlight lamp ctrl Backlighting (8 bulbs) Backlighting control Batt pos volt Bcm (dim) fuse 18 10a Body control module (bcm) (right of glove box) Court lamp sw on sig D x2 Driver information display switch Driver's seat) E12 G300 G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) G305 (under driver's seat) G402 (left rear of luggage compartment) Garage door opener transmitter (in overhead console) Hazard switch Head Headlamp switch Hot at all times Hvac control module I/p dimming sig Inflatable restraint steering wheel module coil (in steering wheel) Inst panel lamp sply Instrument panel cluster (ipc) J202 J203 J206 J214 (in i/p harness, approximately 17 cm (6 in) from breakout for body control module connector) J219 J221 J225 (inside of heated steering wheel) J312 J313 J333 (in body harness, approximately 35 cm (14 in) from breakout for left inflatable restraint side impact sensor) J383 J700 J800 Led dimming sig Left rear window switch Left steering wheel control switch Lighter) x2 Logic Manual air conditioning Off Park lamp sw on sig Pnk Radio Rear fuse block (below left side of rear seat) Reverse lockout solenoid (base of floor shifter assembly) Right rear window switch Right steering wheel control switch Stg illum fuse 8 2a Sunroof switch (if equipped) Traction control switch W/ custom seat W/ individual seat X276 X277
MEMORY SYSTEMS Memory Systems Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009 List of elements for Memory Systems Wiring Diagram (1 of 3) for Buick Lucerne CXL 2009: 61 (in left front seat harness, approximately 14 cm (6 in) from breakout for driver seat adjuster motor) j351 (under driver's seat) g300 A x1 A11 B x1 Battery pos volt D5 x1 Down ctrl Driver lumbar position sensors Driver seat lumbar massage motor (in driver's seat back) Driver seat recline motor (in driver's seat back) Driver seat recline position sensor Dw steering tilt mtr ctrl For telescope mtr ctrl Forward ctrl Front ver mtr dn ctrl Front ver mtr up ctrl Ground Horizontal motor Horizontal sensor Hot at all times J305 J352 (in left front seat harness, approximately 7 cm (3 in) from breakout for inflatable restraint seat position sensor) Lh back element ctrl Lh back sens low ref Lh cushion element ctrl Lh temp sens low ref Low ref Lumbar forward ctrl Lumbar rearward ctrl Mdl-mem fuse 6 10a Memory seat module (on underside of driver's seat, on seat adjuster frame) Memory seat sw high sig Pnk Pnk a Pwr seat circuit breaker 55 25a Pwr t/t circuit breaker 57 25a Rear fuse block (below left side of rear seat) Rear ver mtr dn ctrl Rear ver mtr up ctrl Rearward ctrl Recline forward ctrl Recline rearward ctrl Red Red/ pnk Red/pnk Rev telescope mtr ctrl Rh back sens low ref Rh cushion element ctrl Rh element ctrl Rh temp sens low ref Seats system Tan Tan/ red Tan/red Up ctrl Up steering tilt mtr ctrl Vertical motor Vertical sensor X2 d X3 e8 Memory Systems Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009 List of elements for Memory Systems Wiring Diagram (2 of 3) for Buick Lucerne CXL 2009: 16 C x2 Driver seat adjuster motor assembly (below driver seat) Driver seat front vertical motor Driver seat front vertical position sensor Driver seat horizontal motor Driver seat horizontal position sensor Driver seat rear vertical motor Driver seat rear vertical position sensor J215 J216 Pnk Tan Tan/red Telescoping actuator (if equipped) (on steering column assembly) Tilt actuator (if equipped) (on steering column) X1 a Memory Systems Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009 List of elements for Memory Systems Wiring Diagram (3 of 3) for Buick Lucerne CXL 2009: 55 5v ref Computer data lines system Down Driver cushion temp sens sig Driver lumbar adjuster switch Driver seat adjuster switch Driver seat back temp sens sig Drv seat lumbar dn sw sig Drv seat lumbar forward sw sig Drv seat lumbar rearward sw sig Drv seat lumbar up sw sig Forward Front vertical down Front vertical down sw sig Front vertical mtr pos sens sig Front vertical up Front vertical up sw sig Gmlan serial data Heated seat ctrl module status sig Horizontal forward Horizontal mtr pos sens sig Horizontal rearward Horz forward sw sig Horz rearward sw sig J349 (in left front seat harness, approximately 8 cm (4 in) from breakout for auxiliary power outlet connector) Left Lumbar horizontal pos sens sig Lumbar vertical pos sens sig Memory seat module (on underside of driver's seat, on seat adjuster frame) Nca Pnk Rear vertical down Rear vertical down sw sig Rear vertical mtr pos sens sig Rear vertical up Rear vertical up sw sig Rearward Recline forward Recline mtr forward ctrl Recline mtr pos sens sig Recline mtr rearward ctrl Recline rearward Rh seat back temp sens sig Rh seat cushion temp sens sig Rh seat mode signal Right Seats system Steering column tilt sens sig Tan Telescope forward sw sig Telescope rev sw sig Telescope sens sig Tilt down sw sig Tilt up sw sig Tilt/telescope switch (on steering column)
NAVIGATION Navigation Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Navigation Wiring Diagram for Buick Lucerne CXL 2009: 30 (or 7043) (or 7044) (or bare) Antenna Bare Battery Cell mic sig Cellular microphone (in overhead console) Cellular telephone antenna Coax Computer data lines system Drain Drain wire Drain wire voice rec low ref G305 (under driver's seat) Gmlan serial data Gps antenna Ground Hot at all times Low ref Navigation antenna Power distribution system Radio Radio fuse 44 15a Rear fuse block (below left side of rear seat) Rec aud sig Rec low ref Vehicle communication interface module (vcim) (if equipped) (on right front of trunk, attached to seat back brace) W/ onstar W/o onstar Parking Assistant Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Parking Assistant Wiring Diagram for Buick Lucerne CXL 2009: 45 Batt pos volt Center amber ind Center amber ind ctrl Computer data lines system Driver door module (ddm) Driver outside rearview mirror Front passenger door module (fpdm) G301 (under left rear seat) G403 (right front wall of luggage compt) Gnd Ground Hot at all times Ign 1 volt J400 (in rear fascia harness, approximately 7 cm (3 in) from breakout for right middle object alarm sensor) J401 (in rear fascia harness, approximately 7 cm (3 in) from breakout for right middle object alarm sensor) J402 J405 Led ctrl Led sig Left amber ind Left amber ind ctrl Left rear corner object alarm sensor (on left corner of rear bumper fascia) Left rear middle object alarm sensor (on left middle of rear bumper fascia) Left side object sensor Low ref Low serial data Low speed gmlan serial data Lr corner object sensor sig Lr middle object sensor sig Mdl-rpa fuse 12 10a Object alarm module (on right rear wheelwell) Object sensor sply volt Passenger outside rearview mirror Pnk Rear fuse block (below left side of rear seat) Rear parking assist (rpa) display Red ind Red ind ctrl Right rear corner object alarm sensor (on right corner of rear bumper fascia) Right rear middle object alarm sensor (on right middle of rear bumper fascia) Right side object sensor Rr corner object sensor sig Rr middle object sensor sig Serial data Telltale assembly sply volt
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 5) for Buick Lucerne CXL 2009 List of elements for Power Distribution Wiring Diagram (1 of 5) for Buick Lucerne CXL 2009: 59 (in engine harness, approximately 41 cm (16 in) from underhood fuse block connector c3) j111 (in ip harness, between x201 & x202) j229 (on right front of engine compt, forward of strut tower) underhood fuse block 3.9l 4.6l A/c clutch relay 34 Abs fuse 23 50a Abs mtr fuse 25 60a Air bag fuse 11 10a Air pump relay 37 Air/sol relay 35 Automatic a/c Automatic transmission Battery Body control module (bcm) Ecm/ pcm fuse 9 10a Electronic brake control module (ebcm) Engine control module (ecm) Fan 1 fuse 30a Fan 1 relay 33 Fan 2 fuse 30a Fan 2 relay 31 Fog lamp pcb relay From b trn/sig pcb relay (diagram 1 of 5) Fusible link G112 (lower left rear of engine) Generator High/beam pcb relay Horn pcb relay Hvac control module Hvac/ipc ign 1 fuse 10 10a Ign relay 36 Inflatable restraint i/p module indicator Inflatable restraint sensing & diagnostic module (sdm) Instrument panel cluster (ipc) J105 Lo/beam pcb relay Manual a/c Pnk Pnk/red Pwr/train relay 29 Recirculation actuator Red Starter motor Strtr relay 30 To ecm/ crnk fuse 1 (diagram 5 of 5) To rear fuse block (diagram 2 of 5) To wpr fuse 13 (diagram 1 of 5) Trans ign 1 fuse 8 10a Transmission control module (tcm) Trn/sig pcb relay W/ heated nozzle Windshield washer solvent heater Wpr fuse 25a Wpr hi pcb relay Wpr pcb relay Wsh pcb relay Wsw htr fuse 28 60a X175 Power Distribution Wiring Diagram (2 of 5) for Buick Lucerne CXL 2009 List of elements for Power Distribution Wiring Diagram (2 of 5) for Buick Lucerne CXL 2009: 50 (below left side of rear seat) rear fuse block (in body harness, approximately 10 cm (4 in) from audio amplifier connector c1) j366 A12 Amp-rdo fuse 38 30a Audio amplifier B12 Bcm fuse 40 10a Body control module (bcm) Data link connector (dlc) Ddm fuse 22 15a Digital radio receiver Driver door control module E11 Ecm/tcm fuse 5 15a Engine control module (ecm) Evaporative emission (evap) canister vent solenoid valve F10 From battery (diagram 1 of 5) From c amp-rdo fuse 38 (diagram 2 of 5) Garage door opener transmitter Hvac control module If equipped Inflatable restraint passenger presence system (pps) module Inflatable restraint sensing & diagnostic module (sdm) Instrument panel cluster (ipc) J392 (in headliner harness, approximately 11 cm (5 in) from breakout to rear park assist indicator) Mdl-frt fuse 9 30a Mdl-onstar fuse 42 10a Mdls-body fuse 43 10a Passenger door control module Passkey fuse 13 10a Pdm fuse 29 15a Pnk/ red Radio Radio fuse 44 15a Red Remote control door lock receiver (rcdlr) Sdm fuse 30 10a Seat climate control module Sol can fuse 34 10a Tan/ red Theft deterrent module (tdm) To ign-sw fuse 21 (diagram 3 of 5) To mdls-body fuse 43 (diagram 2 of 5) Transmission control module (tcm) (4.6l) Vehicle commu- nication interface module (vcim) Vehicle direction alert alarm warning module W/ lane departure warning sensor indicator W/ onstar W/o lane departure warning sensor indicator Power Distribution Wiring Diagram (3 of 5) for Buick Lucerne CXL 2009 List of elements for Power Distribution Wiring Diagram (3 of 5) for Buick Lucerne CXL 2009: 62 (below left side of rear seat) rear fuse block (in right front seat harness, approximately 114 cm (45 in) from passenger seat adjuster switch connector) j348 A11 Apos fuse 31 20a Automatic level control (alc) compressor Automatic level control module Bcm (chmsl) fuse 39 10a Bcm (dim) fuse 18 10a Bcm (inadv) fuse 32 10a Bcm (lttn) fuse 25 15a Bcm (rttn) fuse 36 15a Blower motor control module Body control module (bcm) Breakout to right rear corner object alarm sensor) j405 C10 Center console accessory power outlet Cigar lighter Comp relay fuse 24 10a Driver seat adjuster switch E12 Electronic suspension control (esc) module From d pdm fuse 29 (diagram 2 of 5) From e mdl-rtd fuse 15 (diagram 3 of 5) Front accessory power outlet (w/ custom seat) G300 (under driver's seat) G304 (under right front passenger's seat) Ign-sw fuse 21 5a J221 J307 J388 (in body harness, approximately 27 cm (11 in) from branch for rear fuse block) Left side object sensor Level comp fuse 47 40a Level comp relay 53 Ltr-cig fuse 26 20a Mdl-mem fuse 6 10a Mdl-rpa fuse 12 10a Mdl-rtd fuse 15 25a Memory seat module (if equipped) Mtr fuse 48 (automatic a/c) blower fuse 49 (manual a/c) 40a Passenger seat adjuster switch Passenger seat lumbar adjuster switch Pwr seat circuit breaker 55 25a Pwr t/t circuit breaker 57 25a Rear object sensor control module Red/ pnk Rf seat circuit breaker 54 25a Right side object sensor To ignition switch (diagram 5 of 5) To mdl-rpa fuse 12 (diagram 3 of 5) To rap-hc relay 70 (diagram 4 of 5) Trk rel relay 67 W/ custom seat W/ individual seat W/ magneto rheological W/ memory seat W/ multi- directional W/ obstacle detection sensor indicator W/ power tilt telescoping steering column W/ rear parking assist W/o magneto rheological W/o memory seat W/o multi- directional Power Distribution Wiring Diagram (4 of 5) for Buick Lucerne CXL 2009 List of elements for Power Distribution Wiring Diagram (4 of 5) for Buick Lucerne CXL 2009: 57 (below left side of rear seat) rear fuse block (chmsl) fuse 39 (diagram 3 of 5) (in center console harness, approximately 8 cm (3 in) from breakout for a/t shift lock control solenoid) j381 A11 Automatic transmission shift lever B11 Bcm (ctsy) fuse 35 10a Bcm fuse 19 10a Body control module (bcm) Circuit breaker 56 (diagram 4 of 5) Driver door module (ddm) Drl relay 65 E11 From bcm f From pwr wdo g Front passenger door module (fpdm) Fuel pump relay 59 G301 (under left rear seat) Heated steering wheel control module Inflatable restraint steering wheel module coil Inside rearview mirror (isrvm) J302 (in body harness, approximately 19 cm (8 in) from breakout for g301) Left rear window switch Level comp fuse 47 40a Level comp relay 53 Lock relay 63 Nca Park lp-lt relay 58 Park switch Pwr wdo circuit breaker 56 25a Rap-hc relay 70 Rap1 fuse 28 10a Rap2 fuse 33 10a Rear defog fuse 46 40a Rear defog relay 52 Right rear window switch Run 1 fuse 20 7.5a Run 2 fuse 10 10a Run relay 64 Seat climate control module Sunroof control module (if equipped) Sunroof fuse 17 25a Tan Tan/ pnk To rear defog fuse 46 (diagram 4 of 5) Unlock relay 62 Unlock/lock fuse 14 20a W/ custom seat W/ front heated seat cooling W/ heated nozzle W/ heated steering wheel leather wrapped W/ individual seat W/o front heated seat cooling Windshield outside moisture sensor (if equipped) Windshield washer solvent heater X276 X277 Power Distribution Wiring Diagram (5 of 5) for Buick Lucerne CXL 2009 List of elements for Power Distribution Wiring Diagram (5 of 5) for Buick Lucerne CXL 2009: 58 (3.9l) (4.6l) (in engine harness, approximately 3 cm (1 in) from branch for x139) j109 (in engine harness, approximately 6 cm (2 in) from branch for engine coolant temperature (ect) sensor) j110 (in engine harness, approximately 7 cm (4 in) from branch for x139 toward breakout for x138) j102 (in even bank ignition coil harness, between x139 & (on right front of engine compt, forward of strut tower) underhood fuse block 3.9l 4.6l A/c cltch relay 34 Acc Air pump relay 37 Air sol relay 35 Approximately 3 cm (1 in) from branch for x139) j109 Body control module (bcm) Ecm/ crnk fuse 15a Emis dev fuse 15a Engine control module (ecm) Evaporative emission (evap) canister purge solenoid valve Fan 1 relay 33 Fan 2 relay 31 Fan 3 relay 32 From emis dev fuse 7 (diagram 5 of 5) From ign-sw fuse 21 (diagram 3 of 5) From pwr/train relay 29 (diagram 1 of 5) Fuel inj even fuse 15a Fuel inj odd fuse 15a Fuel injector Fuel injector 4 Fuel injector 5 Fuel injector 6 Heated oxygen sensor (ho2s) 1 Heated oxygen sensor (ho2s) 2 Heated oxygen sensor (ho2s) bank 1 sensor 1 Heated oxygen sensor (ho2s) bank 2 sensor 1 Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition coil/module 8) j131 Ignition control module (icm) Ignition switch Key-in switch Mass air flow (maf)/ intake aur temperature (iat) sensor Off Oxy snsr fuse 15a Pnk Pnk (in odd bank ignition coil harness,between x140 & ignition coil/module 7) j142 Run Start Theft deterrent module (tdm) To fuel inj even fuse 3 (diagram 5 of 5) Underhood fuse block (on right front of engine compt, forward of strut tower) X203 & ignition switch connector) j201
POWER DOOR LOCKS Power Door Locks Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Power Door Locks Wiring Diagram for Buick Lucerne CXL 2009: 71 (if equipped) keyless entry antenna (in body harness, approximately 9 cm (3 in) from branch for x314) j343 (under center of rear package shelf) remote control door lock receiver (rcdlr) (under left rear seat) g301 A11 A12 Battery Body control module (bcm) (right of glove box) Coax Computer data lines system Ddm fuse 22 15a Dr lock act ctrl Dr unlock act ctrl Driver door latch assembly (rear of driver's door) Driver door module (ddm) Drv dr key sw sig Exterior lights system Front passenger door latch assembly (rear of front passenger's door) Front passenger door module (fpdm) G104 (right front corner of engine compt) G300 (under driver's seat) G301 (under left rear seat) G304 (under right front passenger's seat) G406 (left "c" pillar) Gmlan serial data Ground Hood ajar sw sig Hood ajar switch (w/ remote keyless entry) (center front of engine compt) Hood closed sw sig Horn rly ctrl Horns system Hot at all times Ign Instrument panel cluster (ipc) J301 J337 J385 J700 J800 Keyless entry antenna sig Left rear door latch assembly (rear of left rear door) Lf dr ajar sw sig Lf dr open sw sig Lf dr sw low ref Lock relay 63 Logic Low spd gmlan ser data Lr dr ajar sw sig Lr dr lk mtr unlock Lr dr open sw sig Mdls- body fuse 43 10a Nca Park lamp rly ctrl Pdm fuse 29 15a Pwr wdo circuit breaker 25a Rear fuse block (below left side of rear seat) Rf dr ajar sw sig Rf dr open sw sig Rf dr sw low ref Right rear door latch assembly (rear of right rear door) Rr dr ajar sw sig Rr dr lk mtr unlock Security ind Serial data Tan Tan/ red Tan/red Unlock relay 62 Unlock/ lock fuse 14 20a W/ theft deterrent system W/o theft deterrent system
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Electrochromic Mirror Wiring Diagram for Buick Lucerne CXL 2009: 29 (left rear of luggage compt) g402 Automatic day/night mirror Button back lighting Day/night mirror sig Driver outside rear view mirror (in driver's door) Emergency ind Emergency switch Exterior lights system Hot w/ rap-hc relay 70 energized Ign Inside rearview mirror J312 Keypad green led ind Keypad green led sig Keypad red led ind Keypad red led sig Keypad sig Logic Low ref Nca Onstar ind Onstar keypad Onstar switch Phone ind Phone switch Power distribution system Rap 2 fuse 33 10a Rear fuse block (below left side of rear seat) Vehicle communication interface module (vcim) (w/ onstar) (on right front of trunk, attached to seat back brace) Power Mirrors Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Power Mirrors Wiring Diagram for Buick Lucerne CXL 2009: 38 5v ref A12 x2 Automatic day/night mirror Battery positive voltage Computer data lines system Ddm fuse 22 15a Defogger system Driver door module (ddm) Driver mir horz pos sens sig Driver mir ver pos sens sig Driver outside rear view mirror (in driver's door) Electrochromic mirror circuit Exterior lights system Front passenger door module (fpdm) Front passenger outside rear view mirror (in front passenger's door) Heating element Hot at all times Led ctrl Led sig Left mir mtr dn ctrl Left mir mtr left ctrl Left mir mtr up/right ctrl Low gmlan Low ref Nca Outside rearview mirror switch Pass mir horz pos sens sig Pass mir mtr left ctrl Pass mir ver pos sens sig Pdm fuse 29 15a Pnk Rear fuse block (below left side of rear seat) Right mir mtr dn ctrl Right mir mtr up/right ctrl Tan/ red Tan/pnk Tan/red W/ side obstacle detection sensor indicator
POWER SEATS 6-Way Power Seat Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 6-Way Power Seat Wiring Diagram for Buick Lucerne CXL 2009: 28 A11 Driver seat adjuster motor assembly (below driver seat) Driver seat adjuster switch Driver seat front vertical motor Driver seat horizontal motor Driver seat rear vertical motor E12 x1 Forward Front down Front passenger seat adjuster motor assembly (below front passenger's seat) Front passenger seat front vertical motor Front passenger seat horizontal motor Front passenger seat rear vertical motor Front up G300 (under driver's seat) G304 (under right front passenger's seat) Hot at all times J387 Nca Passenger seat adjuster switch Pwr seat circuit breaker 55 25a Rear down Rear fuse block (below left side of rear seat) Rear up Rearward Red/ pnk Rf seat circuit breaker 54 25a Tan 8-Way Passenger Power Seat Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 8-Way Passenger Power Seat Wiring Diagram for Buick Lucerne CXL 2009: 23 E12 x1 Forward Front down Front passenger seat adjuster motor assembly (below front passenger's seat) Front passenger seat front vertical motor Front passenger seat horizontal motor Front passenger seat rear vertical motor Front passenger seat recline motor Front up G304 (under right front passenger's seat) Hot at all times J306 J348 Nca Passenger seat adjuster switch Rear down Rear fuse block (below left side of rear seat) Rear up Rearward Recline forward Recline rearward Rf seat circuit breaker 54 25a Tan Climate Control Seats Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Climate Control Seats Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 46 (4 in) from driver seat adjuster motor connector) (in driver seat harness, approximately 10 cm (in right front seat harness, approximately 7 cm (3 in) from breakout for passenger seat cushion ventilation heat & cool module) j358 (in right front seat harness, approximately 7 cm (3 in) from passenger seat cushion ventilation heat & cool module connector) j357 A12 A3 x1 B12 Battery Climate control seat module Computer data lines system Cool control Ddm fuse 22 15a Driver seat back ventilation heat & cool module (right side of driver's seat back) Driver seat cushion ventilation heat & cool module (under right side of driver's seat) G304 (under right front passenger's seat) Ground Heat control Heating element Hot at all times Hot w/ run relay energized Ign 3 vol J302 (w/ custom seat) J306 J355 J356 (in driver seat harness, approximately 9 cm (4 in) from driver seat cushion ventilation heat & cool module connector) Lh mode sig Low ref Mdl-frt fuse 9 30a Passenger seat back ventilation heating & cooling module Passenger seat cushion ventilation heating & cooling module Pdm fuse 29 15a Pnk Rear fuse block (below left side of rear seat) Rh mode sig Run 2 fuse 10 10a Sens low ref Sens sig Serial data Speed ctrl Sup volt Tan Tan/ red Tan/pnk Tan/red Thermistor X2 d4 Climate Control Seats Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Climate Control Seats Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 37 Back cushion ind Back cushion sig Back cushion sw sig Back mode ind Back mode ind cntrl Back mode sw sig Battery pos volt Computer data lines system Cool ind cntrl Cool seat switch Cool sw sig Cooled seat switch Driver door module (ddm) Driver heated & cooled seat switch Front passenger door module (fpdm) Front passenger heated & cooled seat switch Full seat heat switch Gmlan serial data Heated seat back ind Heated seat cool ind Heated seat ctrl module Heated seat cushion ind Heated seat ind High ind ctrl High temp ind Lamp dimming Low ind ctrl Low ref Low temp ind Medium ind ctrl Medium temp ind Memory seat module (on underside of driver's seat, on seat adjuster frame) Pnk Rh seat mode signal Seat back heat switch Tan Tan/red Heated Seats Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Heated Seats Wiring Diagram for Buick Lucerne CXL 2009: 29 (in driver seat harness, between driver position module & left front cushion heated seat element) j359 (in right front seat harness, between x314 & left front cushion heated seat element) j360 Battery pos volt Computer data lines system Drv cushion temp sens sig rh seat cushion temp sens sig rh seat back temp sens sig drv seat back temp sens sig x5 G300 (under driver's seat) Gmlan serial data Ground Heating element Hot at all times J305 Left front back heated seat element Left front cushion heated seat element Lh back element ctrl Lh back sens low ref Lh cushion element ctrl Lh temp sens low ref Mdl-mem fuse 6 10a Memory seat module (on underside of driver's seat, on seat adjuster frame) Pnk Rear fuse block (below left side of rear seat) Rh back sens low ref Rh cushion element ctrl Rh element ctrl Rh temp sens low ref Right front cushion heated seat element Right front heated seat back element Thermistor X1 d5 Heated Steering Wheel Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Heated Steering Wheel Wiring Diagram for Buick Lucerne CXL 2009: 28 (under driver's seat) g300 D x277 F3 x2 G300 (under driver's seat) Gnd H x277 Heated steering wheel Heated steering wheel control module Heated steering wheel on ind Heated steering wheel switch High ctrl Hot w/ run relay energized Ign Inflatable restraint steering wheel module coil (top of steering column) J204 J219 (in steering column harness, between horn switch & inflatable restraint steering wheel module coil) Left heated steering wheel element Left steering wheel control switch Nca Rear fuse block (below left side of rear seat) Red Right heated steering wheel element Run 1 fuse 20 7.5a Sens sig Sw led ctrl Sw sig X276 d X276 h Lumbar Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Lumbar Wiring Diagram for Buick Lucerne CXL 2009: 13 Down E12 Forward G304 (under right front passenger's seat) Hot at all times J306 (w/ 8 way) J348 (w/ 8 way) Passenger lumbar adjuster switch Passenger seat lumbar motor Pnk Rear fuse block (below left side of rear seat) Rearward Rf seat circuit breaker 54 25a
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Power Top/Sunroof Wiring Diagram for Buick Lucerne CXL 2009: 36 (not used) Accessory vol B + Close ctrl Dimming E11 G402 (left rear of luggage compt) G403 (right front wall of luggage compt) Ground Hot w/ rap hc relay energized Interior lights system J313 J330 Open ctrl Pnk Power distribution system Rap 2 fuse 33 10a Rear fuse block (below left side of rear seat) Roof close Roof express Roof open Roof sw data 1 Roof sw data 2 Roof sw data 3 Roof sw data 4 Roof sw data 5 Roof sw data 6 Sunroof control module (rear of sunroof opening) Sunroof fuse 17 25a Sunroof motor Sunroof switch Tan Vent close Vent express Vent open X399
POWER WINDOWS Power Windows Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Power Windows Wiring Diagram for Buick Lucerne CXL 2009: 42 (under left rear seat) g301 (under right front passenger's seat) g304 A11 Batt volt Body control module (bcm) (right of glove box) Computer data lines system Driver door module (ddm) Driver door window switch Driver window motor (in driver's door) Front passenger door module (fpdm) Front passenger door window switch Front passenger window motor (in front passenger's door) Ft pass wndo mtr G300 (under driver's seat) G304 (under right front passenger's seat) Gmlan serial data Ground Hot at all times Interior lights system J337 J700 J800 Left front down ctrl Left front up ctrl Left rear down ctrl Left rear down sig Left rear up ctrl Left rear up sig Left rear window motor (in left rear door) Left rear window switch Logic Master sw sig Pwr wdo circuit breaker 56 25a Rear fuse block (below left side of rear seat) Right rear down ctrl Right rear down sig Right rear sig Right rear up ctrl Right rear up sig Right rear window motor (in right rear door) Right rear window switch Sply volt
RADIO Radio Wiring Diagram, with Amplifier (1 of 2) for Buick Lucerne CXL 2009 List of elements for Radio Wiring Diagram, with Amplifier (1 of 2) for Buick Lucerne CXL 2009: 57 (on right front of trunk, attached to seat back brace) (if equipped) vehicle communication interface module (vcim) (or 7043) (or 7044) (under driver's seat) g305 Amplifier control Antenna sig Antenna signal Anti-lock brakes system Audio common sig Backlight lamp ctrl Bare Battery Battery pos voltage Cellular navigation & digital radio antenna (if equipped) (center rear of roof) Computer data lines system Device left audio sig Digital radio receiver (drr) (at left "d" pillar) Drain wire Drain wire audio lo ref Front audio drain wire G305 (under driver's seat) Global positioning system (gps) antenna (under top center of dash) Gps antenna Ground Hot at all times Interior lights system Left audio sig (+) Left audio signal (+) Left audio signal (-) Lf low level audio (-) Lf low level audio sig Low speed gmlan serial data Lr low level audio (-) Lr low level audio sig (+) Navigation system Navigation voice sig voice recognition audio sig Pnk Radio Radio antenna module (at right "d" pillar) Radio fuse 44 15a Rear audio drain wire Rear fuse block (below left side of rear seat) Remote enable sig Rf low level audio (-) Rf low level audio sig Right audio sig (+) Right audio sig (-) Right audio signal (+) Right audio signal (-) Rr low level audio (-) Rr low level audio sig (+) Serial data Tan Tan/red Vehicle speed sig W/ onstar W/o onstar Radio Wiring Diagram, with Amplifier (2 of 2) for Buick Lucerne CXL 2009 List of elements for Radio Wiring Diagram, with Amplifier (2 of 2) for Buick Lucerne CXL 2009: 68 Amp-rdo fuse 38 30a Amplifier (mounted to left rear of rear seat) Amplifier ctrl Battery Body control module (bcm) (right of glove box) Center i/p speaker Computer data lines system Cruise control system Ctrl sig E11 x3 F cen spkr (+) F cen spkr (-) G305 (under driver's seat) Ground Hot at all times Inflatable restraint steering wheel module coil (top of steering column) Info J361 (in body harness, between x300 & amplifier) J362 (in body harness, between x300 & amplifier) J363 (in body harness, between x301 & amplifier) J364 (in body harness, between x301 & amplifier) J365 J366 Left front door speaker Left front tweeter speaker Left rear speaker Lf low level (-) Lf low level sig Lf speaker (+) Lf spkr sig (-) Lo spd Lr low level (-) Lr low level sig Lr mid spkr (+) Lr mid spkr (-) Lr speaker (-) Lr spkr sig (+) Module coil) j220 Mute Nca Pnk Rear fuse block (below left side of rear seat) Remote enable sig Rf low level (-) Rf low level sig Rf speaker (+) Rf spkr sig (-) Right front door speaker Right front tweeter speaker Right rear speaker Right steering wheel control switch Rr low level (-) Rr low level sig Rr mid spkr (+) Rr mid spkr (-) Rr speaker (+) Rr spkr sig (-) Seek dn Seek up Ser data Source Tan Tan/red Volt sply Volume dn Volume up X276 X277 Radio Wiring Diagram, without Amplifier for Buick Lucerne CXL 2009 List of elements for Radio Wiring Diagram, without Amplifier for Buick Lucerne CXL 2009: 82 (in body harness, between x300 & amplifier) j362 (in body harness, between x301 & amplifier) j363 (on right front of trunk, attached to seat back brace) (if equipped) vehicle communication interface module (vcim) (or 7043) (or 7044) (under driver's seat) g305 Antenna sig Anti-lock brakes system Audio common sig Backlight lamp ctrl Bare Batt pos volt Battery Body control module (bcm) (right of glove box) Cellular navigation & digital radio antenna (center rear of roof) Computer data lines system Cruise control system Ctrl sig Device left audio sig Digital radio receiver (drr) (if equipped) (at left "d" pillar) Drain wire Drain wire audio lo ref G305 (under driver's seat) Global positioning system (gps) antenna (under top center of dash) Gps antenna Ground Hot at all times Inflatable restraint steering wheel module coil (top of steering column) Info Interior lights system J220 (in steering column harness, between cruise control on/off switch & inflatable restraint steering wheel module coil) J361 (in body harness, between x300 & amplifier) J364 (in body harness, between x301 & amplifier) Left audio sig (+) Left audio signal (-) Left front door speaker Left front spkr (+) Left front spkr sig (-) Left front tweeter speaker Left rear speaker Lo spd gmlan serial data Lo spd ser data Lr midrange speaker (-) Lr midrange spkr (+) Lt audio sig (+) Lt audio sig (-) Mute Navigation system Navigation voice sig recognition audio sig Nca Pnk Radio Radio antenna module (at right "d" pillar) Radio fuse 44 15a Rear fuse block (below left side of rear seat) Remote enable sig Remote enable sig (12v) Right audio signal (+) Right audio signal (-) Right front door speaker Right front spkr (+) Right front spkr sig (-) Right front tweeter speaker Right rear speaker Right steering wheel control switch Rr midrange spkr (+) Rr midrange spkr (-) Rt audio sig (+) Rt audio sig (-) Seek dn Seek up Serial data Source Sply volt Tan Vehicle speed sig Volume dn Volume up W/ onstar W/o onstar X276 X277
SHIFT INTERLOCK Shift Interlock Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Shift Interlock Wiring Diagram for Buick Lucerne CXL 2009: 49 3.9l 4.6l 5 volt ref A3 x1 Automatic transmission Automatic transmission a/t shift lock control solenoid Automatic transmission floor shifter assembly (w/ custom seat) Automatic transmission internal mode switch (ims) B7 x2 Body control module (bcm) (right of glove box) Brake pedal position (bpp) sensor (top of brake pedal assembly) Computer data lines system Data bus + Data bus - Engine control module (ecm) (left side of engine compt) G112 (lower left rear of engine) G300 (under driver's seat) G304 (under right front passenger's seat) Hot w/ rap-hc relay 70 energized Hot w/ run relay 64 energized Ignition lock cylinder control solenoid J105 J204 J302 (w/ climate control seats) J381 J383 Low ref Nca b Nca c Nca d Nca e Nca f Park switch Rap 1 fuse 28 10a Rear fuse block (below left side of rear seat) Reverse lockout solenoid Run 2 fuse 10 10a Sensor sig Sol ctrl Supp volt Sw sig a Sw sig b Sw sig c Sw sig p Tan Transmission control module (tcm) (4.6l: left rear of engine compt) Transmission internal mode switch (ims) W/ custom seat/ floor shifter W/ individual seat/ column shifter
STARTING/CHARGING Charging Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Charging Wiring Diagram for Buick Lucerne CXL 2009: 31 3.9l 4.6l Battery Battery current sensor (below right side of rear seat) Battery positive volt Bcm (lttn) fuse 25 15a Body control module (bcm) (right of glove box) Charge ind Computer data lines system Current sensor low ref Current sensor sig Engine control module (ecm) (left side of engine compt) Fusible link G303 (below right side of rear seat) Gen field duty sig Gen turn on-sig Generator Ground Hi speed gmlan serial data + Hi speed gmlan serial data - Ign Instrument panel cluster (ipc) Lo spd gmlan serial data Logic Pnk Rear fuse block (below left side of rear seat) Red Serial data Starter motor Tan Underhood fuse block (on right front of engine compt, forward of strut tower) Starting Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Starting Wiring Diagram for Buick Lucerne CXL 2009: 44 (or pnk) 3.9l 4.6l 5 volt ref Acc Automatic transmission Automatic transmission internal mode switch (ims) Battery Body control module (bcm) (right of glove box) Charging circuit Computer data lines system Ecm/ crank fuse 1 15a Ecm/pcm fuse 9 10a Engine control module (ecm) (left side of engine compt) G112 (lower left rear of engine) G303 (below right side of rear seat) Ground distribution system Hi speed gmlan serial data + Hi speed gmlan serial data - Hi speed serial data Hot at all times Hot w/ pwr/train relay 29 energized Ign 1 volt Ign relay 36 Ign sw fuse 21 5a Ign vol Ign vol (run/crank) Ignition switch J105 Off Off/run/crank volt Park/neutral sig Pnk Rear fuse block (below left side of rear seat) Red Run Start Starter motor Starter rly Strtr fuse 24 40a Strtr relay 30 Tan Underhood fuse block (on right front of engine compt, forward of strut tower) X175
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Buick Lucerne CXL 2009: 45 (in body harness, approximately 42 cm (17 in) from breakout for yaw & lateral acceleration sensor) j370 (in steering wheel) inflatable restraint steering wheel module (right side of dash) inflatable restraint i/p module (under right front Air bag fuse 11 10a Batt positive vol Case ground Computer data lines system Driver seat belt buckle Driver seat belt switch Ground High control Hot w/ ign relay energized Ign 1 vol Inflatable restraint sensing & diagnostic module (sdm) (under center console) Inflatable restraint steering wheel module coil (top of steering column) Left inflatable restraint front end sensor (left front of engine compt) Left inflatable restraint side impact module (left side of driver's seat back) Left inflatable restraint side impact sensor (sis) (base of left "b" pillar) Low control Low reference Low speed Nca Passenger's seat) g302 Pin shorting bars engaged Pnk Pnk/ red Pnk/red Right inflatable restraint front end sensor (right front of engine compt) Right inflatable restraint seat position sensor (sps) (on front passenger's seat left seat rail) Right inflatable restraint side impact module (right side of front passenger's seat back) Right inflatable restraint side impact sensor (sis) (base of right "b" pillar) Sensor signal Sensor voltage Shorting bar Stage 1 Stage 2 Switch signal Tan Tan/ pnk Tan/pnk Underhood fuse block (on right front of engine compt, forward of strut tower) When module connector is disconnected from harness: (shorting bars are connected between following pins: 4-5, 6-7, 8-9, 10-11, 14-15, 20-21, 22-23 & 26-27) X207 a1 X211 Supplemental Restraints Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Buick Lucerne CXL 2009: 43 (left rear of luggage compt) g402 (under driver's seat) g300 Air bag ind Batt positive vol Belt tension sensor Computer data lines system Driver seat belt pretensioner Gmlan (sdm) Ground Hot at all times Ign Inflatable restraint i/p module indicator Inflatable restraint passenger presence system (pps) module (under front passenger's seat) Inflatable restraint passenger presence system (pps) sensor (under right side of front passenger's seat) Inflatable restraint seat belt tension sensor Instrument panel cluster (ipc) J312 Left inflatable restraint roof rail module (if equipped) (left roof rail) Logic Low reference Nca Off ind On ind Pass air bag off ind ctrl Pass air bag on ind ctrl Pass seat belt ind Passenger air bag ind Passenger seat belt buckle Passenger seat belt pretensioner Pnk Pnk/ red Pnk/red Pnk/tan Rear fuse block (below left side of rear seat) Right inflatable restraint roof rail module (if equipped) (right roof rail) Sdm fuse 30 10a Seat belt ind Sensor signal Serial data Shorting bar Tan Tan/pnk Voltage reference
TRANSMISSION
3.9L VIN 1 3.9L VIN 1, Transmission Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 3.9L VIN 1, Transmission Wiring Diagram for Buick Lucerne CXL 2009: 69 (lower left rear of engine) g112 1-2 shift solenoid (ss) valve 2-3 shift solenoid (ss) valve Acc Acc voltage Acc wakeup serial data x4 Atf position switch Automatic transmission Automatic transmission fluid pressure (tfp) manual valve position switch Automatic transmission fluid temperature (tft) sensor Automatic transmission input shaft speed (iss) sensor Automatic transmission internal mode switch (ims) Battery Body control module (bcm) (right of glove box) Computer data lines system Driver information center (dic) display Ecm/tcm fuse 5 15a Engine control module (ecm) (left side of engine compt) Exterior lights system G112 (lower left rear of engine) Gmlan serial data Ground Hot at all times Hot w/ ign relay 36 energized Ign 1 Ignition switch Instrument panel cluster (ipc) Iss high sig Iss low sig J100 J104 (in engine harness, approximately 13 cm (5 in) from breakout for x138) J105 J111 J115 J201 Logic Low ref Nca Off P/n sig Pc sol hi ctrl Pc sol vlv ctrl Pnk Pressure control (pc) solenoid valve Rear fuse block (below left side of rear seat) Red Run Serial data Serial data bus+ Serial data bus- Shift sol vlv a Shift sol vlv b Start Stop lamp sw sig Tan Tan b Tcc sol ctrl Tft sens sig Torque converter pulse width modulation(pwm) solenoid valve Trans ign 1 fuse 8 10a Trans range a Trans range b Trans range c Trans range p Transmission control module (tcm) Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle speed (vss) sensor (in transmission) Vss hi sig Vss low sig
3.9L VIN M 3.9L VIN M, Transmission Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 3.9L VIN M, Transmission Wiring Diagram for Buick Lucerne CXL 2009: 69 (lower left rear of engine) g112 1-2 shift solenoid (ss) valve 2-3 shift solenoid (ss) valve Acc Acc voltage Acc wakeup serial data x4 Atf position switch Automatic transmission Automatic transmission fluid pressure (tfp) manual valve position switch Automatic transmission fluid temperature (tft) sensor Automatic transmission input shaft speed (iss) sensor Automatic transmission internal mode switch (ims) Battery Body control module (bcm) (right of glove box) Computer data lines system Driver information center (dic) display Ecm/tcm fuse 5 15a Engine control module (ecm) (left side of engine compt) Exterior lights system G112 (lower left rear of engine) Gmlan serial data Ground Hot at all times Hot w/ ign relay 36 energized Ign 1 Ignition switch Instrument panel cluster (ipc) Iss high sig Iss low sig J100 J104 (in engine harness, approximately 13 cm (5 in) from breakout for x138) J105 J111 J115 J201 Logic Low ref Nca Off P/n sig Pc sol hi ctrl Pc sol vlv ctrl Pnk Pressure control (pc) solenoid valve Rear fuse block (below left side of rear seat) Red Run Serial data Serial data bus+ Serial data bus- Shift sol vlv a Shift sol vlv b Start Stop lamp sw sig Tan Tan b Tcc sol ctrl Tft sens sig Torque converter pulse width modulation(pwm) solenoid valve Trans ign 1 fuse 8 10a Trans range a Trans range b Trans range c Trans range p Transmission control module (tcm) Underhood fuse block (on right front of engine compt, forward of strut tower) Vehicle speed (vss) sensor (in transmission) Vss hi sig Vss low sig
4.6L VIN 9 4.6L VIN 9, Transmission Wiring Diagram for Buick Lucerne CXL 2009 List of elements for 4.6L VIN 9, Transmission Wiring Diagram for Buick Lucerne CXL 2009: 61 (in engine harness, approximately 13 cm (5 in) from breakout for x138) j104 (in transmission) vehicle speed sensor (vss) (right of glove box) body control module (bcm) 1-2 shift solenoid valve 2-3 shift solenoid valve Acc Automatic transmission Automatic transmission input shaft speed (iss) sensor Battery Computer data lines system Ecm/tcm fuse 5 15a Engine control module (ecm) (left side of engine compartment) Exterior lights system G112 (lower left rear of engine) Gmlan serial data Ground Hot at all times Hot w/ ign relay 36 energized Ign 1 Ignition switch Iss high sig Iss low sig J100 J105 J111 J201 Low ref Nca Off P/n signal Pc sol hi ctrl Pc sol vlv ctrl Pnk Pnk e Pnk u Pressure control (pc) solenoid valve Rear fuse block (below left side of rear seat) Run Serial data Serial data bus+ Serial data bus- Shift sol vlv a Shift sol vlv b Start Stop lamp sw sig Tan Tan m Tcc sol ctrl Tft sens sig Torque converter clutch (tcc) solenoid valve Trans ign 1 fuse 8 10a Trans range a Trans range b Trans range c Trans range p Transmission control module (tcm) (left rear of engine compartment) Transmission fluid temperature (tft) sensor Transmission internal mode switch (ims) Underhood fuse block (on right front of engine compartment, forward of strut tower) Vss hi sig Vss low sig
TRUNK, TAILGATE, FUEL DOOR Trunk Release Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Trunk Release Wiring Diagram for Buick Lucerne CXL 2009: 18 (under right front passenger's seat) g304 A8 x1 Body control module (bcm) (right of glove box) G301 (under left rear seat) G402 (left rear of luggage compt) Headlamp switch Hot at all times Interior lights system J206 Rear compartment lid latch (center rear of luggage compt) Rear fuse block (below left side of rear seat) Trk rel fuse 37 10a Trk rel relay 67 Trunk ajar sw sig x6 Trunk release ctrl x2 Trunk release relay ctrl x7 X2 b8 X3 e10
WARNING SYSTEMS Chime Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Chime Wiring Diagram for Buick Lucerne CXL 2009: 70 (on master cylinder reservoir) brake fluid level switch (w/ rke) keyless entry antenna Acc Audible alarm Auto Battery positive volt Bcm (chmsl) fuse 39 10a Bcm (lttn) fuse 25 15a Bcm (rttn) fuse 36 15a Body control module (bcm) (right of glove box) Brake ind Coax Computer data lines system D9 x2 Driver door latch assembly (rear of driver's door) Driver door module (ddm) Driver information center (dic) Driver seat belt buckle Driver seat belt switch Drv seat belt sw sig Engine coolant temperature ind Exterior lights system G300 (under driver's seat) G304 (under right front passenger's seat) G406 (left "c" pillar) Gmlan Gmlan serial data Gmlan serial data gmlan serial data Ground Head Headlamp switch Hot at all times Ignition switch Inflatable restraint sensing & diagnostic module (sdm) (under center console) Instrument panel cluster (ipc) Ipc J206 J370 (in body harness, approximately 42 cm (17 in) from breakout for yaw & lateral acceleration sensor) J385 Key-in ignition switch Keyless entry/ tire pressure antenna signal Lf door ajar sw sig Lf door open sw sig Lf door sw low ref Logic Low engine oil pressure ind Low ref Low spd serial data Low tire pressure ind Lt turn switch sig Nca Off Off/run crank vol Park Park brake sw sig Park brake switch (on top of park brake assembly) Park lp sw sig Radio Rear fuse block (below left side of rear seat) Remote control door lock receiver (rcdlr) (under center of rear package shelf) Rt turn switch sig Run Seat belt ind Start Sw-ign fuse 21 5a Tan/ pnk Tan/pnk W/ theft deterrent system W/o theft deterrent system X3 e12 Lane Departure Warning Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Lane Departure Warning Wiring Diagram for Buick Lucerne CXL 2009: 24 (left rear of luggage compt) g402 (under driver's seat) g300 B1 x3 Batt Computer data lines system Driver information center (dic) Gnd Headlamp switch Hot at all times Instrument panel cluster (ipc) Interior lights system J203 J312 J392 Lane departure ind Lane dept warn ctrl Lane dept warn on sig Left turn ind Logic Mdls- body fuse 43 10a Rear fuse block (below left side of rear seat) Right turn ind Serial data Vehicle direction alert alarm warning module
WIPER/WASHER Wiper/Washer Wiring Diagram for Buick Lucerne CXL 2009 List of elements for Wiper/Washer Wiring Diagram for Buick Lucerne CXL 2009: 64 Acc volt Batt pos volt Body control module (bcm) (right of glove box) Delay switch Driver information center (dic) display Fluid sw sig wash fluid suply volt G101 (left front corner of engine compt) G104 (right front corner of engine compt) G300 (under driver's seat) G304 (under right front passenger's seat) G402 (left rear of luggage compt) Ground Heated washer fluid ind ctrl Heated washer fluid switch High High speed rly ctrl Hot at all times Hot w/ rap-hc relay 70 energized Hot w/ run relay 64 energized Instrument panel cluster (ipc) Int J204 J312 Logic Low Low washer fluid ind sig Mist Off Park sw sig Park switch Pnk Power distribution system Rap 2 fuse 33 10a Rear fuse block (below left side of rear seat) Run 2 fuse 10 10a Run ign 3 volt Sen sig 1 Sen sig 2 Sensor signal 1 Sensor signal 2 Tan Turn signal/multi-function switch Underhood fuse block (on right front of engine compt, forward of strut tower) Washer rly ctrl Washer sw sig Washer switch Windshield outside moisture sensor (if equipped) (above rearview mirror on windshield) Windshield wash Windshield washer fluid level switch (bottom of windshield washer fluid reservoir) Windshield washer fluid pump (bottom of windshield washer fluid reservoir) Windshield washer solvent heater (w/ heated nozzles) Windshield wiper motor (on left side of firewall) Wiper rly ctrl Wiper sw high sig Wiper sw low sig Wiper switch Wpr fuse 25a Wpr hi pcb relay Wpr pcb relay Wsh pcb relay Wsw htr fuse 60a Wsw mtr fuse 19 15a X1 j3 X2 k2
