Buick LaCrosse I (2004-2009) (3.6l: below right front strut tower) (3.8l: near battery) Wiring diagrams

3.6L 3.8L BATT + BATTERY BATTERY CURRENT SENSOR BLK WIRE BLK/WHT WIRE BRN WIRE CHARGE INDICATOR CLSTR FUSE COMPUTER DATA LINES SYSTEM CURRENT SENSOR LOW REF CURRENT SENSOR SIG DK GRN WIRE ECM CLASS 2 SERIAL DATA ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) FUSIBLE LINK (8 GA- GENERATOR GENERATOR FIELD DUTY CYCLE SIG GENERATOR TURN ON SIG GROUND GRY WIRE HOT AT ALL TIMES I/P CLASS 2 SERIAL DATA I/P DIMMING VOLTAGE REF I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INSTRUMENT PANEL CLUSTER (IPC) LOGIC ORG/ WIRE PCM CLASS 2 SERIAL DATA PCM/ECM CLASS 2 SERIAL DATA POWER DISTRIBUTION SYSTEM POWERTRAIN CONTROL MODULE (PCM) RED (OR ORG) WIRE RED WIRE RED/WHT WIRE SPLICE PACK STARTER WHT WIRE

3.6L 3.8L A/C CLU DIODE A/C COMPRESSOR CLUTCH A/C WIPER RELAY 37 RELAY 45 AUTOMATIC TRANSMISSION TRANSMISSION CLUTCH INTERNAL MODE DIODE SWITCH (IMS) BATTERY BLK WIRE BODY CONTROL MODULE (BCM) ELECTRONIC BRAKE CONTROL MODULE (EBCM) EXCEPT SULEV FUEL PP RELAY 41 HEADLAMP ASSEMBLY) HOOD AJAR SWITCH HORN ASSEMBLY IGN 1 HDM BEAM MODULE 35 IGN 1 HDM BEAM RELAY 37 MODULE 35 LAMP LEFT FRONT MARKER LAMP LEFT HIGH BEAM HEADLAMP POWERTRAIN CONTROL MODULE (PCM) RIGHT COOLING FAN RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ RIGHT TURN FRONT SIGNAL FOG LAMP LAMP RIGHT HIGH BEAM HEADLAMP SECONDARY AIR INJECTION (AIR) PUMP (SULEV) SULEV TAN WIRE THROTTLE ACTUATOR CONTROL (TAC) MODULE TRANSMISSION CONTROL MODULE (TCM) FUEL PP RELAY 41 WHT WIRE WINDSHIELD WASHER FLUID LEVEL SWITCH WINDSHIELD WASHER FLUID PUMP

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