Buick LaCrosse I (2004-2009) body control module (bcm) (behind left side of dash, left of steering column) Wiring diagrams

10 59 STOP SWITCH SIG SET/COAST RESUME/ ACCELERATE SIGNAL 10 VOLT REF 5 VOLT REFERENCE 1 PPL LOW REFERENCE 5 VOLT REFERENCE 2 LOW REFERENCE APP SENSOR 2 SIGNAL 55 54 15 8 31 39 TP SENS 1 SIG ACCELERATOR PEDAL POSITION (APP) SENSOR (ABOVE ACCELERATOR PEDAL) BAT POS VOL BCM CLASS 2 DATA BLK WIRE BLU WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE CLSTR FUSE COMPUTER DATA LINES SYSTEM CRUISE CAN SW SIG CRUISE FUSE CRUISE INDICATOR CRUISE SET XX MPH CRUISE SWITCH DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (IN STEERING COLUMN) INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SER DATA LEFT STEERING WHEEL CONTROLS LOGIC LOW REF LT BLU WIRE LT GRN WIRE MESSAGE MESSAGE CENTER (UP LEVEL) NCA WIRE ON IND. ORG/ WIRE PCM CLASS 2 SER DATA PNK WIRE PPL REAR OBJECT SENSOR CONTROL MODULE RES+ SET- STOP LAMP SIG STOP SWITCH SIG TAC MTR CTRL 2 TP SENS 2 SIG TAC MTR CTRL 1 LOW REF PPL TAN WIRE THROTTLE ACTUATOR CONTROL (TAC) MODULE (AT THROTTLE BODY) TRANSMISSION CONTROL MODULE (TCM) UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) VEH SPD SIG VEHICLE SPEED SENSOR (VSS) VSS HIGH SIG VSS LOW SIG WHT WIRE WHT/BLK WIRE YEL WIRE

10 VOLT REF 32 22 44 STOP SWITCH SIG VEHICLE SPEED SIGNAL 5 VOLT REF ACCELERATOR PEDAL POSITION (APP) SENSOR (ABOVE ACCELERATOR PEDAL) APP SENS 1 SIG APP SENS 2 SIG BAT POS VOL BLK WIRE BLU WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE CLSTR FUSE COMPUTER DATA LINES SYSTEM CRUISE CAN SW SIG CRUISE FUSE CRUISE INDICATOR CRUISE SET XX MPH DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (IN STEERING COLUMN) INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SER DATA LEFT STEERING WHEEL CONTROLS LOGIC LOW REF LT BLU WIRE LT GRN WIRE MESSAGE MESSAGE CENTER (UP LEVEL) NCA WIRE ON IND. ORG/ WIRE ORG/BLK WIRE PCM CLASS 2 SER DATA PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF ENGINE COMPT, NEAR AIR CLEANER ASSEMBLY) PPL PPL LOW REF REAR OBJECT SENSOR CONTROL MODULE RES+ SER DATA PRIMARY SER DATA SECONDARY SET CRUISE SWITCH SET/COAST RESUME/ ACCELERATE SIGNAL STOP LAMP SIG STOP LAMP SW SIG STOP SWITCH SIG BCM CLASS 2 DATA LOW REF TAN WIRE THROTTLE ACTUATOR CONTROL (TAC) MODULE (AT THROTTLE BODY) UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) VEH SPD SIG VEHICLE SPEED SENSOR (VSS) VEHICLE SPEED SIGNAL VSS HIGH SIGNAL VSS LOW SIGNAL WHT WIRE WHT/BLK WIRE YEL WIRE

1715 1415 2144 1251 1356 94 524 192 1872 WIPER/WASHER SYSTEM 1732 690 1315 1314 80 17 1037 INTERIOR LIGHTS SYSTEM 244 17 DOOR LOCKS SYSTEM EXTERIOR LIGHTS SYSTEM 28 1439 1459 860 HORNS SYSTEM POWER DISTRIBUTION SYSTEM 295 294 550 440 19 DOOR LOCKS SYSTEM A/T SHFT LK CTRL SOL VOLT ANTI-THEFT SYSTEM EXTERIOR LIGHTS SYSTEM ANTI-THEFT SYSTEM WIPER/WASHER SYSTEM BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE BRN/WHT WIRE CHMSL/ BKUP FUSE COURTESY LAMPS SW ON SIG I/P DIMMING RET TRACTION CTRL SW SIG LOW REF DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR LOCKS SYSTEM NAVIGATION SYSTEM DR LCK/ TRUNK FUSE GRY WIRE GRY/BLK WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INT/ ILLUM FUSE HAZRD FUSE INTERIOR LIGHTS SYSTEM DOOR LOCKS SYSTEM DEFOGGER SYSTEM LR DOOR OPEN SW SIG RF DOOR AJAR SW SIG REAR DEFOG RLY CTRL LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE ORG/BLK WIRE PARK BRAKE SWITCH (ON PARK BRAKE ASSEMBLY) PASS DOOR LOCK SW LOCK SIG STOP LAMP SW SIG PNK PPL WIRE PNK WIRE PNK/BLK WIRE PNK/WHT WIRE POWER DISTRIBUTION SYSTEM PPL RED WIRE RED/BLK WIRE RED/WHT WIRE SEATS SYSTEM SHIFT INTERLOCK SYSTEM SHIFT INTERLOCK SYSTEM INTERIOR LIGHTS SYSTEM WIPER/WASHER SYSTEM TAN WIRE TAN/WHT WIRE WARNING SYSTEM EXTERIOR LIGHTS SYSTEM COMPUTER DATA LINES SYSTEM WHT WIRE WHT/BLK WIRE WIPER/WASHER SYSTEM WIPER/WASHER SYSTEM EXTERIOR LIGHTS SYSTEM WIPER/WASHER SYSTEM HEADLIGHTS SYSTEM WIPER/WASHER SYSTEM YEL WIRE YEL/BLK WIRE

AUTOMATIC A/C MANUAL A/C BATT MAIN 3 FUSE 28 BCM CLASS 2 SERIAL DATA BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE COMPASS SENS RTN DEFOGGER DRIVER OUTSIDE REARVIEW MIRROR ELECTRONIC COMPASS MODULE (TOP RIGHT SIDE OF REAR PACKAGE SHELF) HOT AT ALL TIMES HTD MIR FUSE HVAC CLASS 2 SERIAL DATA INSTRUMENT PANEL CLUSTER (IPC) INSTRUMENT PANEL FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LOGIC LOGIC HVAC CONTROL MODULE (CENTER OF DASH) LT GRN WIRE ON IND. ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR REAR DEFOG RELAY CTRL REAR DEFOGGER SWITCH REAR WINDOW DEFOGGER GRID RED WIRE RR DEFOG RELAY UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) W/ DRIVER INFO CENTER DISPLAY WHT WIRE

3.6L 3.8L AMBIENT SUNLOAD LIGHT SENSOR SENSOR ASSEMBLY (TOP OF (TOP CENTER OF DASH) DASH) AUTO PARK BCM BCM CLASS 2 SERIAL BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE CLSTR FUSE COMPUTER DATA LINES SYSTEM DK GRN WIRE DK GRN/WHT WIRE DRL AMBIENT LIGHT EXTERIOR LAMPS OFF FLASH TO PASS SW FOG FOG LAMP IND FOG LAMP RELAY CTRL FOG LP RELAY 36 FOG LPS FUSE 7 FRONT FOG LAMP SW FTP GRY WIRE HDLP SUGGEST IND HDM BEAM MODULE 35 HEAD HEADLAMP MOD CTRL HEADLAMP ON SIG HI BEAM RELAY 34 HI BEAM RLY CTRL HIGH BEAM IND HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN IGN B+ INSTRUMENT PANEL CLUSTER (IPC) LAMP SWITCH ASSEMBLY LEFT FRONT FOG LAMP LEFT HIGH BEAM HEADLAMP LEFT LOW BEAM HEADLAMP LF HI BEAM FUSE 1 LF LO BEAM FUSE 3 LOGIC LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE MANUAL AUTO A/C A/C OFF ORG/ WIRE PNK WIRE PNK/WHT WIRE PPL PPL HEADLAMP DIMMER SW RF HI BEAM FUSE 2 RF LO BEAM FUSE 4 RIGHT FRONT FOG LAMP RIGHT HEADLAMP ON FRAME) RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP SERIAL DATA TAN WIRE TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE YEL WIRE

BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) DK GRN WIRE GROUND DISTRIBUTION SYSTEM HORN ASSEMBLY (RIGHT FRONT OF VEHICLE) HORN FUSE 11 HORN RELAY 39 HORN RLY CTRL HORN SWITCH HOT AT ALL TIMES INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (IN STEERING COLUMN) NCA WIRE STEERING WHEEL) TAN WIRE UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER)

1 3 2 SENSOR SIGNAL SUPPLY VOLTAGE LOW REFERENCE 2 3 1 LOW REFERENCE SUPPLY VOLTAGE SENSOR SIGNAL BACKUP LAMP SPLY VOLTAGE REAR PARKING DIAGNOSTIC SIG BACKUP LAMP SUPPLY VOLTAGE BLK WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CENTER AMBER IND CENTER AMBER IND CTRL LEFT AMBER IND CTRL CHIME CONTROL CHIME CONTROL TELLTALE ASSEMBLY SPLY VOLTAGE DISPLAY FUSE 18 DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (3.6L) (TOP OF ENGINE) ENGINE CONTROLS SYSTEM GROUND IGN 1 VOLTAGE PNK WIRE GRY WIRE HOT W/ IGN 1 RELAY ENERGIZED I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IND LEFT AMBER IND LEFT REAR CORNER OBJECT SENSOR (LEFT SIDE OF REAR BUMPER) LEFT REAR MIDDLE OBJECT SENSOR (MIDDLE OF BUMPER) LT GRN WIRE ORG/ WIRE PNK PNK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM REAR OBJECT SENSOR CONTROL MODULE (UNDER CENTER OF REAR WINDOW SHELF) REAR PARKING ASSIST (RPA) DIAGNOSTIC CONNECTOR (LEFT SIDE OF TRUNK) REAR PARKING ASSIST (RPA) DISPLAY RED IND CTRL WIRE RED WIRE RIGHT REAR CORNER OBJECT SENSOR (RIGHT SIDE OF REAR BUMPER) RIGHT REAR MIDDLE OBJECT SENSOR (MIDDLE OF REAR BUMPER) SPLICE PACK UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) VEHICLE SPEED SIG VSS SIG WHT WIRE YEL WIRE

12 VOLT REF 3.8L 3.6L BATTERY BATTERY POSITIVE REMOTE STARTER DISABLED CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 SERIAL DATA CLSTR FUSE CRANK RELAY 48 CRANK VOLTAGE DK GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE HOLD- IN COIL HOOD AJAR SWITCH (W/ REMOTE KEYLESS ENTRY) (FRONT OF ENGINE COMPT) HOOD AJAR SWITCH SIG HOT AT ALL TIMES HOT W/ IGN 1 RELAY ENERGIZED I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGNITION SWITCH INSTRUMENT PANEL CLUSTER (IPC) LOCK LOGIC LT GRN WIRE ORG/ WIRE PCM FUSE 15 PNK IGNITION 1 VOLTAGE WIRE PNK WIRE PNK/BLK WIRE POWER DISTRIBUTION SYSTEM PPL PULL- IN COIL RED WIRE RUN WIRE SPLICE PACK START ENABLE RLY CTRL STARTER STARTER FUSE 33 UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CHMSL/ BKUP FUSE DOOR LOCK AJAR INDICATOR SWITCH DR/LCK TRUNK FUSE DRIVER DOOR LOCK (IN REAR AJAR EXT LMPS OFF INPUT GRY WIRE GRY/BLK WIRE HAZRD FUSE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGNITION SWITCH INT/ ILLUM FUSE KEY IN IGNITION LAMP SWITCH ASSEMBLY LEFT REAR DOOR LOCK AJAR LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE OFF HEAD ORG/ WIRE ORG/BLK WIRE PARK AUTO PARK BRAKE SWITCH (ON PARK BRAKE ASSEMBLY) SIDE OF DRIVER'S DOOR) SWITCH UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WASHER/ RVC FUSE 6

3.6L 3.8L BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 SERIAL DATA DELAY SWITCH DK GRN WIRE GRN WIRE GROUND GRY WIRE HIGH PPL HOT AT ALL TIMES IGN LOGIC INSTRUMENT PANEL CLUSTER (IPC) LOW WASH INDICATOR LOW WASHER FLUID IND SIG LT BLU WIRE LT GRN WIRE MESSAGE CENTER LOW WASHER FLUID MESSAGE REQUEST MIST OFF ORG/ WIRE PARK SW SIG PARK SWITCH PNK WINDSHIELD WASHER SW SIG WIRE PNK WIRE PPL DK RED WIRE SPLICE PACK TAN WIRE TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WASHER PUMP CTRL WASHER SWITCH WASHER/ RVC FUSE 6 WHT WIRE WINDSHIELD WASHER FLUID LEVEL SWITCH WINDSHIELD WIPER MOTOR (ON LEFT SIDE OF FIREWALL) WINDSHIELD WIPER SW HI SIG WINDSHIELD WIPER SW HIGH SIG WINDSHIELD WIPER SW LOW SIG WINDSHIELD WIPER SWITCH WIPER HI RELAY 44 WIPER RELAY 45 WIPER RLY CTRL WIPER/ WS FUSE 5 YEL WIRE