Buick LaCrosse I (2004-2009) brn Wiring diagrams

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

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) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE CLASS 2 SERIAL DATA DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH) DK BLU WIRE DRIVER HEATED SEAT BACK ELEMENT (IN DRIVER'S SEAT BACK) DRIVER HEATED SEAT CUSHION ELEMENT (IN DRIVER'S SEAT CUSHION) DRIVER HEATED SEAT HIGH INDICATOR DRIVER HEATED SEAT LOW INDICATOR DRIVER HEATED SEAT SWITCH DRIVER'S HEATED SEAT RELAY (UNDER DRIVER'S SEAT FRONT PASSENGER HEATED SEAT HIGH INDICATOR FRONT PASSENGER HEATED SEAT LOW INDICATOR FRONT PASSENGER HEATED SEAT SWITCH GRY WIRE HEATED SEAT ELEMENT HEATED SEAT THERMISTOR HOT AT ALL TIMES HTD SEAT FUSE HVAC CONTROL MODULE (CENTER OF DASH) I/P FUSE BLOCK INFLATABLE RESTRAINT FRONT PASSENGER PRESENCE SYSTEM LOGIC LT GRN WIRE NCA WIRE ORG/ WIRE PASSENGER HEATED SEAT BACK ELEMENT (IN PASSENGER'S SEAT BACK) PASSENGER HEATED SEAT CUSHION ELEMENT (IN PASSENGER'S SEAT BACK) PASSENGER'S HEATED SEAT RELAY (UNDER PASSENGER'S SEAT) PNK WIRE PPL RED/WHT WIRE SPLICE PACK TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE YEL/BLK WIRE

ABS INDICATOR ABS/TCS CLASS 2 SERIAL DATA AIR BAG INDICATOR AMBIENT AIR TEMPERATURE SENSOR BASE BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BRAKE FLUID LEVEL SWITCH (CENTER OF BRAKE FLUID RESERVOIR) DEFOGGER SYSTEM BRAKE INDICATOR BRN WIRE BRN/WHT WIRE CHARGING INDICATOR COMPASS SENS FEED COMPASS SENS RET COMPUTER DATA LINES SYSTEM CRUISE INDICATOR DISPLAY FUSE 18 DK BLU WIRE ECM/PCM CLASS 2 SERIAL DATA ECM/PCM CLASS 2 SERIAL DATA IGN ELECTRONIC COMPASS MODULE (TOP RIGHT SIDE OF REAR PACKAGE SHELF) ENGINE CONTROLS SYSTEM ENGINE COOLANT TEMPERATURE GAGE ENGINE COOLANT TEMPERATURE INDICATOR ENGINE OIL LEVEL SWITCH (LOWER FRONT CENTER OF ENGINE OIL PAN) ENGINE OIL PRESSURE (EOP) SWITCH (BELOW POWER STEERING PUMP) FOG LAMPS INDICATOR FUEL GAGE GRY WIRE HIGH BEAM INDICATOR HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) CLSTR FUSE HOT W/ IGN 1 RELAY ENERGIZED I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN IGN 1 VOLTAGE INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SERIAL DATA IPC/BCM CLASS 2 SERIAL DATA KM/H INDICATOR LEFT TURN INDICATOR LOGIC LOW FUEL WARNING LAMP INDICATOR LOW TIRE PRESSURE INDICATOR LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP (MIL) MESSAGE REQUEST MPH INDICATOR ODO/TRIP OIL LEVEL INDICATOR LAMP ORG/ WIRE P R N D 3 2 1 PCM/ECM CLASS 2 SERIAL DATA PNK PPL WIRE PNK WIRE POWER DISTRIBUTION SYSTEM REAR DEFOG RLY CTRL RED WIRE RIGHT TURN INDICATOR SDM CLASS 2 SERIAL DATA SEAT BELT INDICATOR SPEEDOMETER SUPPLEMENTAL RESTRAINTS SYSTEM TACHOMETER TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRACTION OFF INDICATOR TURN AUDIBLE INDICATOR UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE YEL WIRE

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

1-2 SHIFT SOLENOID VALVE 12 VOLT REFERENCE IGNITION 3 VOLTAGE 2-3 SHIFT SOLENOID VALVE 3.6L 3.6L 3.8L 3.8L A/C CLUTCH FUSE 13 A/C COMP RELAY 38 ABS FUSE 23 AUTOMATIC A/C PNK PNK WIRE AUTOMATIC TRANSMISSION AUX PWR FUSE 10 AUXILIARY POWER OUTLET BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE BODY CONTROL MODULE (BCM) BRN WIRE CIGAR LIGHTER CRANK RELAY 48 CRANK VOLTAGE CRUISE FUSE ENGINE CONTROL MODULE (ECM) ENGINE POWERTRAIN CONTROL CONTROL MODULE MODULE (ECM) (PCM) FROM IGN 1 RELAY (DIAGRAM 2 OF 4) FROM WASHER/RVC FUSE 6 (DIAGRAM 1 OF 4) HVAC CONTROL MODULE AUTOMATIC A/C MANUAL A/C I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGN 1 RELAY 37 IGNITION 1 VOLTAGE IGNITION SWITCH INFLATABLE ELECTRONIC RESTRAINT COMPASS SENSING, MODULE DIAGNOSTIC MODULE INFLATABLE RESTRAINT PASSENGER AIR BAG ON/OFF INDICATOR INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL INSIDE AIR TEMPERATURE SENSOR KEY IN IGNITION SWITCH SIGNAL KEY-IN IGNITION SWITCH LOCK LT GRN WIRE NCA WIRE ORG/ WIRE P/TRAIN RELAY 40 PCM FUSE 15 PNK PNK PNK W/ PARK ASSIST WIRE PNK PNK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) RED WIRE RUN WIRE SIR FUSE 9 DISPLAY FUSE 18 STEERING ANGLE SENSOR (W/ ABS) TCM FUSE 8 TO A/C CLUTCH FUSE (DIAGRAM 2 OF 4) TO ETC FUSE 17 (DIAGRAM 3 OF 4) TO FAN 2 FUSE (DIAGRAM 3 OF 4) TORQUE CONVERTER POWERTRAIN CLUTCH CONTROL (TCC) MODULE SOLENOID (PCM) VALVE TRANS SOL FUSE 21 TRANSMISSION CONTROL MODULE (TCM) TRANSMISSION CONTROL MODULE (TCM) (3.6L) UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE YEL WIRE

BLK WIRE BRN WIRE DEFOGGER SYSTEM DOWN DRIVER OUTSIDE REARVIEW MIRROR GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) ILLUM DRIVER LEFT LEFT RIGHT LEFT/ RIGHT UP/ DOWN LT BLU WIRE LT GRN WIRE ORG/ WIRE OUTSIDE REARVIEW MIRROR SWITCH PASSENGER PASSENGER DRIVER PASSENGER OUTSIDE REARVIEW MIRROR PWR/MIR FUSE RED WIRE RIGHT UP DOWN WHT WIRE YEL WIRE

ACCESSORY VOLTAGE BLK WIRE BRN WIRE CLOSE OPEN/VENT DK BLU WIRE HOT W/ RAP RELAY ENERGIZED I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) ORG/ WIRE S/ROOF FUSE SUNROOF MOTOR SUNROOF SWITCH SUNROOF SWITCH CLOSE SIGNAL GROUND SUNROOF SWITCH LOW REFERENCE SUNROOF SWITCH OPEN SIGNAL W/ INSIDE REARVIEW MIRROR YEL WIRE

BLK WIRE BLU WIRE BRN WIRE DK BLU WIRE DK GRN WIRE DOWN DRIVER WINDOW MOTOR (CENTER OF DRIVER'S DOOR) DRIVER WINDOW SWITCH EXPRESS DOWN EXPRESS DOWN MODULE FRONT PASSENGER WINDOW MOTOR (CENTER OF FRONT PASSENGER'S DOOR) FRONT PASSENGER WINDOW SWITCH GRY WIRE HOT W/ RAP RELAY ENERGIZED I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) ILLUMINATION LEFT REAR WINDOW MOTOR (CENTER OF LEFT REAR PASSENGER DOOR) LEFT REAR WINDOW SWITCH LOCK OUT SWITCH LT BLU WIRE LT GRN WIRE PPL PWR/WNDW CIRCUIT BREAKER RIGHT REAR WINDOW MOTOR (CENTER OF RIGHT REAR PASSENGER DOOR) RIGHT REAR WINDOW SWITCH TAN WIRE TOWARDS INLINE UP DOWN UP ILLUM YEL WIRE