Buick LaCrosse I (2004-2009) yel 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

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

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

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

3.8L 3.6L ABS MTR FUSE 31 ABS SOL FUSE 19 AIR PUMP FUSE 25 AUTOMATIC A/C MANUAL A/C BATT MAIN 1 FUSE 26 BATT MAIN 2 FUSE 27 BATT MAIN 3 FUSE 28 BATT MAIN 4 FUSE 30 BATTERY BLK WIRE BLK/WHT WIRE BLOWER MOTOR CONTROL PROCESSOR BODY CONTROL MODULE (BCM) CANISTER FUSE PRK/ SWITCH FUSE CHMSL/ BKUP FUSE INT ILLUM FUSE CLSTR FUSE DATA LINK CONNECTOR (DLC) DIGITAL RADIO RECEIVER DR/LCK TRUNK FUSE RAP RELAY DRIVER DRIVER SEAT SEAT ADJUSTER LUMBAR SWITCH SWITCH DRIVER PASSENGER HEATED HEATED SEAT RELAY SEAT RELAY (IF EQUIPPED) (IF EQUIPPED) DRIVER WINDOW SWITCH ELECTRONIC BRAKE CONTROL MODULE (EBCM) (W/ ABS) EVAPORATIVE PARK EMISSION SWITCH (EVAP) CANISTER VENT SOLENOID FRONT PASSENGER WINDOW SWITCH FUSIBLE LINK (8 GA- GENERATOR HAZRD FUSE HTD SEAT FUSE HVAC CONTROL MODULE HVAC FUSE I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INFLATABLE RESTRAINT FRONT PASSENGER PRESENCE SYSTEM (PPS) MODULE INSIDE SUNROOF REARVIEW MOTOR MIRROR NCA WIRE ONSTAR/ ALDL FUSE ORG/ WIRE OUTSIDE REAR VIEW MIRROR SWITCH PASSENGER SEAT ADJUSTER SWITCH (IF EQUIPPED) PCM/ ETC FUSE 16 POWERTRAIN ENGINE CONTROL CONTROL MODULE MODULE (PCM) (ECM) PRK LAMP RELAY PRK/LAMP FUSE PWR SEAT CIRCUIT BREAKER PWR WNDW CIRCUIT BREAKER PWR/ MIR FUSE R/ DEFOG RELAY RADIO AUDIO AMPLIFIER (W/ 9 SPEAKER SYSTEM) RDO AMP FUSE RED WIRE RFA/ MOD FUSE S/ROOF FUSE SECONDARY AIR INJECTION (AIR) PUMP RELAY (W/ CALIFORNIA PZEV EMISSION SYSTEM) STARTER TO TCM FUSE 8 VEHICLE COMMUNICATION INTERFACE MODULE (VCIM) (IF EQUIPPED) W/ DIGITAL AUDIO SYSTEM W/ DRIVER POWER LUMBAR CONTROL SEAT W/ SUNROOF W/ VEHICLE COMMUNICATION SYSTEM W/O DIGITAL AUDIO SYSTEM W/O DRIVER POWER LUMBAR CONTROL SEAT W/O SUNROOF WASHER/ RVC FUSE 6 WHT WIRE YEL WIRE

1-2 SHIFT SOLENOID 2-3 SHIFT SOLENOID A/T FLUID TEMP SENSOR AIR PRES SENS AT ISS SIG AUTOMATIC TRANSMISSION PRESSURE CONTROL SOLENOID BLK WIRE BLK/WHT WIRE BOOST SOL BRN WIRE DK BLU/WHT WIRE DK GRN WIRE GRY WIRE IAT SENSOR SIG INPUT SHAFT SPEED SENSOR LOW REF LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE MAF SENSOR SIG NEAR AIR CLEANER ASSEMBLY) ORG/ WIRE PC SOL PNK PNK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF ENGINE COMPARTMENT) PPL RED WIRE RED/BLK WIRE SHIFT SOL TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TCC RELEASE SWITCH TCC SOL TCC SW SIG TFT SENSOR SIG TORQUE CONVERTER CLUTCH SOLENOID TR SW A TR SW B TR SW C TR SW P TRANSMISSION INTERNAL MODE SWITCH VEHICLE SPEED SENSOR (RIGHT SIDE OF TRANSMISSION, NEAR RIGHT AXLE SHAFT) VSS SIG WHT WIRE YEL WIRE YEL/BLK WIRE

AIR PUMP FUSE 25 BLK WIRE BLK/WHT WIRE BRN WIRE CNSTR FUSE DK GRN WIRE DK GRN/WHT WIRE EMISSION FUSE 12 FUEL PP FUSE 22 FUEL PP RELAY 41 FUSE 14 GRY WIRE HEATED OXYGEN HOT AT ALL TIMES HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) MAF IAT NCA WIRE ORG/ WIRE P/TRAIN RELAY 40 PNK PNK WIRE PNK WIRE PPL RED WIRE SECONDARY AIR INJECTION PUMP (PZEV) (NEAR TRANSMISSION STUD, LEFT OF STARTER) SECONDARY AIR INJECTION PUMP RELAY (PZEV) (NEAR AIR CLEANER DUCT) TAN WIRE TAN/WHT WIRE TO P/TRAIN FUSES (DIAGRAM 2 OF 5) UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) W/O STABILITY CONTROL WHT WIRE YEL WIRE