Buick LaCrosse I (2004-2009) (in right door sill, forward of right front seat) Wiring diagrams

37 38 GMLAN SER DATA 46 29 TR SW B TR SW A AUTOMATIC TRANSMISSION BACKUP LAMP SPLY VOLT BATTERY VOLT BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CHMSL/ BKUP FUSE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE GMLAN SER DATA HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LEFT BACK-UP LAMP LT BLU WIRE LT GRN WIRE ORG/ WIRE RED WIRE RIGHT BACK-UP LAMP SPLICE PACK TRANSMISSION INTERNAL MODE SWITCH (IMS) WHT WIRE YEL WIRE

AUTOMATIC TRANSMISSION BACKUP LAMP SPLY VOLT BATTERY VOLT BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CHMSL/ BKUP FUSE COMPUTER DATA LINES SYSTEM DK GRN WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LEFT BACK-UP LAMP LT GRN WIRE ORG/ WIRE PCM CLASS 2 SERIAL DATA POWERTRAIN CONTROL MODULE (PCM) RED WIRE RIGHT BACK-UP LAMP SPLICE PACK TR SW A TR SW B TRANSMISSION INTERNAL MODE SWITCH (IMS) WHT WIRE YEL 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

30 48 43 STOP LAMP SW SIG RR STOP/TURN VOLT LR STOP/TURN VOLT 8 16 17 4 PARK LAMP ON SIG HAZARD SW SIG RIGHT TURN SW SIG LEFT TURN SW SIG ANTI-LOCK BRAKES, ENGINE CONTROLS SYSTEM ANTI-LOCK BRAKES, ENGINE CONTROLS, TRANSMISSIONS SYSTEMS BCM CLASS 2 SERIAL DATA BCM CLASS 2 SERIAL DATA IGN BLK WIRE BLK/WHT WIRE BLU WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE BRN/WHT WIRE CENTER HIGH MOUNTED STOP LAMP (CHMSL) CHMSL/ BKUP FUSE COMPUTER DATA LINES SYSTEM DK BLU/WHT WIRE DK GRN WIRE DK LT DRIVER INFORMATION CENTER GRY WIRE HAZARD HAZRD FUSE HEAD HOT AT ALL TIMES HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SERIAL DATA LAMP SWITCH ASSEMBLY LEFT LEFT FRONT MARKER LAMP LEFT FRONT PARK/ TURN SIGNAL LAMP LEFT LICENSE LAMP LEFT TAIL/ STOP, TURN SIGNAL LAMP LEFT REAR LEFT TURN INDICATOR LOGIC LOWER UPPER LEFT LEFT TAIL LAMP TAIL LAMP LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE MARKER LAMP ORG/ WIRE PARK AUTO OFF PRK LAMP FUSE PRK LAMP RELAY RIGHT RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN SIGNAL LAMP RIGHT LICENSE LAMP RIGHT REAR RIGHT TAIL/ STOP, TURN SIGNAL LAMP LOWER RIGHT TAIL LAMP UPPER RIGHT TAIL LAMP RIGHT TURN INDICATOR SPLICE PACK TAN WIRE TURN AUDIBLE INDICATOR TURN SIGNAL/ MULTI-FUNCTION SWITCH WHT WIRE YEL WIRE

4 3 2 1 VOLT (+) AJAR DOOR LOCK AJAR INDICATOR SWITCH BLK WIRE BLK/WHT WIRE BLU WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 COAX ANTENNA SIG COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/WHT WIRE DOOR AJAR INDICATOR DOOR AJAR TRUNK AJAR DOOR LOCK ACTUATOR DOOR LOCK CYLINDER SWITCH DOOR LOCK OPEN INDICATOR SWITCH DR/LCK TRUNK FUSE DRIVER DOOR LOCK (IN REAR SIDE OF DRIVER'S DOOR) DRIVER DOOR LOCK SWITCH FRONT PASSENGER DOOR LOCK (IN REAR SIDE OF FRONT PASSENGER'S DOOR) FRONT PASSENGER DOOR LOCK SWITCH GRY WIRE GRY/BLK WIRE HORNS SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INSTRUMENT PANEL CLUSTER (IPC) LEFT REAR DOOR LOCK (IN REAR SIDE OF LEFT REAR PASSENGER'S DOOR) LOCK LOCK UNLOCK LOGIC LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MESSAGE CENTER NCA WIRE ORG/ WIRE ORG/BLK WIRE PASSENGER SEAT, APPROXIMATELY 26 CM FROM SECOND PNK RFA SER DATA GROUND WIRE POWER DISTRIBUTION SYSTEM PPL REAR COMPARTMENT LID LATCH (IN REAR COMPT LID) RED WIRE RED/BLK WIRE REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) RFA/MOD FUSE RIGHT REAR DOOR LOCK (IN REAR SIDE OF RIGHT REAR PASSENGER'S DOOR) SECURITY INDICATOR TAN WIRE THEFT LED TOWARDS INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE) TRUNK AJAR INDICATOR UNLOCK W/ DIGITAL AUDIO SYSTEM WHT WIRE YEL WIRE YEL/BLK WIRE

A/T SHIFT LOCK CONTROL SOLENOID AMBIENT LIGHT SENSOR AUTOMATIC A/C AUXILIARY POWER OUTLET BLK WIRE BLK/WHT WIRE BLOWER MOTOR CONTROL PROCESSOR BODY CONTROL MODULE (BCM) BRAKE FLUID LEVEL CENTER HIGH MOUNTED STOP LAMP (CHMSL) CIGAR LIGHTER COLUMN SHIFT CONSOLE SHIFT CUSTOM 9 SPEAKER SYSTEM DATA LINK CONNECTOR (DLC) DRIVER INFORMATION CENTER (DIC) FRONT (IN RIGHT TAILLAMP WIRING HARNESS) PASSENGER DOOR LOCK FRONT FRONT PASSENGER PASSENGER WINDOW DOOR LOCK SWITCH SWITCH GPS 1 VEHICLE COMMUNICATION SYSTEM HVAC CONTROL MODULE HVAC CONTROL RADIO MODULE I/P COMPARTMENT LAMP SWITCH I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGNITION LOCK CYLINDER CONTROL ACTUATOR IGNITION SWITCH INFLATABLE RESTRAINT PASSENGER AIR BAG ON/OFF INDICATOR INFLATABLE RESTRAINT SENSING, FUEL DIAGNOSTIC PUMP, MODULE SENDER (SDM) ASSEMBLY INSTRUMENT PANEL CLUSTER THEFT (IPC) SWITCH LED LAMP SWITCH ASSEMBLY LEFT I/P COURTESY LAMP LOWER RIGHT MANUAL A/C MANUAL A/C AUTOMATIC A/C MOTOR - FRONT PASSENGER) NCA WIRE OVERHEAD CONSOLE READING LAMPS PASSENGER OUTSIDE REARVIEW MIRROR MOTOR RADIO REAR COMPARTMENT RIGHT REAR LID LATCH DOOR LOCK RIGHT DOME/ READING SUNROOF LAMP MODULE RIGHT I/P COURTESY LAMP RIGHT REAR MARKER LAMP RIGHT TAIL/STOP, TURN SIGNAL LAMP SUNLOAD SENSOR ASSEMBLY THEFT DETERRENT EXCITER MODULE TURN SIGNAL/ MULTIFUNCTION SWITCH UPPER RIGHT RIGHT BACKUP TAIL TAIL LAMP LAMP LAMP WHT WIRE WINDSHIELD WIPER MOTOR WIPER HI WIPER RELAY 44 RELAY 45

15 43 8 SERIAL DATA FUEL LVEL SIG LOW REF PPL 3.6L 3.8L 3.8L PPL 31 57 OIL LVL SW SIG OIL PRESS SW 40 5 7 OIL PRESS SW 42 25 48 PPL FUEL LVEL SIG LOW REF SERIAL DATA AIR CONDITIONING SYSTEM ANTI-LOCK BRAKES SYSTEM BASE BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE COMPUTER DATA LINES SYSTEM DK GRN WIRE DOOR LOCK AJAR INDICATOR SWITCH DRIVER INFORMATION CENTER (DIC) TRACTION CONTROL (UPLEVEL) E/M (BASE) ENGINE CONTROL MODULE (ECM) (3.6L) (TOP OF ENGINE) ENGINE CONTROLS SYSTEM FUEL (UPLEVEL) GRY WIRE GRY/BLK WIRE HAZARD GAGES (UPLEVEL) INFO (UPLEVEL) LF DR AJAR SW SIG LOGIC ENGINE OIL PRESSURE (EOP) SENSOR (LEFT FRONT OF ENGINE BLOCK) LOW REF LR DR AJAR SW SIG LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE OIL PRESS SW ORG/ WIRE ORG/BLK WIRE PARK BRAKE SW SIG PARK BRAKE SWITCH (ON PARK BRAKE ASSEMBLY) PNK WIRE PPL PPL/WHT WIRE REAR COMPARTMENT LID LATCH (IN REAR COMPT LID) REAR LID AJAR SW RED WIRE RED/BLK WIRE RF DR AJAR SW SIG RR DR AJAR SW SIG TAN WIRE TAN/BLK WIRE TRIP SET/RESET ODO (UPLEVEL) WHT WIRE YEL WIRE

31 57 OIL LVL SW SIG OIL PRESS SW BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE COMPUTER DATA LINES SYSTEM DK GRN WIRE DOOR LOCK AJAR INDICATOR SWITCH DRIVER DOOR LOCK DOOR (IN REAR SIDE OF DRIVER'S DOOR) LOCK AJAR INDICATOR SWITCH ENGINE CONTROLS SYSTEM ENGINE OIL LEVEL SWITCH (LOWER FRONT CENTER OF ENGINE OIL PAN) ENGINE OIL PRESSURE (EOP) SWITCH (BELOW POWER STEERING PUMP) FRONT PASSENGER DOOR LOCK (IN REAR SIDE OF FRONT PASSENGER'S DOOR) FUEL LEVEL SENSOR FUEL PUMP/ SENDER ASSEMBLY (IN FUEL TANK) GRY WIRE GRY/BLK WIRE I/P FUSE BLOCK (BEHIND RIGHT LEFT REAR DOOR LOCK (IN REAR SIDE OF LEFT REAR PASSENGER'S DOOR) LF DR AJAR SW SIG LOW REF LR DR AJAR SW SIG LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE ORG/BLK WIRE PARK BRAKE SW SIG PPL PPL FUEL LVEL SIG PPL/WHT WIRE REAR COMPARTMENT LID LATCH (IN REAR COMPT LID) REAR LID AJAR SW RED WIRE RED/BLK WIRE RF DR AJAR SW SIG RR DR AJAR SW SIG SERIAL DATA SIDE OF DASH) TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE

ACCELERATOR PEDAL POSITION SENSOR (ABOVE ACCELERATOR PEDAL) AIR CONDITIONING SYSTEM ANTI-LOCK BRAKE SYSTEM AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE CLASS 2 DATA CLU RLY CTRL MIL CTRL COMPUTER DATA LINES SYSTEM COOLING FANS SYSTEM CRUISE CONTROL SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (TOP OF ENGINE) FUEL LEVEL SENSOR GMLAN BUS- GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN 3 VOLT CC SW SIG APP SENS SIG IGNITION SWITCH INSTRUMENT PANEL CLUSTER LAN BUS + LOCK LOGIC IGN LOW REF LT BLU WIRE MALFUNCTION INDICATOR LAMP NAVIGATION SYSTEM 6105 5069 2759 NCA WIRE ORG/ WIRE ORG/BLK WIRE P/N SIG EVAP SOL CTRL PNK IGN 1 VOLT FAN RLY CTRL ENG SPD SIG WIRE PNK IGN 1 VOLT WIRE PNK WIRE PPL PPL FUEL LEV SIG MAF SIG APP SENS 2 SIG PPL LOW REF A/C REF PRES STOP LP SW IAT SIG TANK PRES SIG PPL/WHT WIRE RED/BLK WIRE REQ TORQ SIG RLY COIL CTRL BATTERY + DELV TORQUE SIG RLY CTRL FAN RLY CTRL RUN WIRE STARTING/ CHARGING SYSTEM 625 540 464 TAN (OR BLK) WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRANSMISSION INTERNAL MODE SWITCH P/N UNDERHOOD FUSE BLOCK UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) VSS GMLAN BUS+ MAIN RLY CTRL LOW REF LOW REF WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

12 2 1 B+ CLASS 2 GND IGN 5-VOLT REF 1 5-VOLT REF 2 A/C PRESS SIG STOP LAMP SW A/C CLUTCH RELAY RELAY CTRL AIR CONDITIONING SYSTEM BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE CLASS 2 DATA CLSTR FUSE COOLING FANS SYSTEM CRUISE CONTROL SYSTEM DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COMPARTMENT, NEAR AIR CLEANER ASSEMBLY) EVAP VENT SOL FUEL PUMP RELAY FUEL PUMP, SENDER ASSEMBLY FUEL TANK DK FUEL TANK PRESS FUEL TANK PRESSURE SENSOR GRN WIRE GRY WIRE HIGH FAN HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGNITION SWITCH INSTRUMENT PANEL CLUSTER LOCK LOGIC LOW FAN LOW REF MALFUNCTION INDICATOR LAMP (MIL) MIL CONTROL LOW REF LOW REF NAVIGATION SYSTEM NCA WIRE ORG/ WIRE PCM FUSE 15 PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF PPL PPL FUEL LEVEL SIG CRUISE SIG RED/BLK WIRE RUN WIRE STARTING/CHARGING SYSTEM UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE YEL/BLK WIRE