Buick LaCrosse I (2004-2009) (in on-engine wiring harness, approximately 34.5 cm from engine control module) Wiring diagrams

23 7 ECT SENS SIG LOW REF 9 39 25 4 20 48 49 A/C PRESS SIGNAL A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, ON ACCUMULATOR) BATT MAIN 4 FUSE 30 BLK WIRE BLK/WHT WIRE BLOWER MOTOR (BEHIND RIGHT BLOWER MOTOR CONTROL PROCESSOR (ON LOWER RIGHT SIDE OF DASH) BRN WIRE COMPUTER DATA LINES SYSTEM DISPLAY FUSE 18 DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) ENGINE CONTROLS SYSTEM GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT AT ALL TIMES I/P FUSE BLOCK HVAC FUSE (BEHIND RIGHT SIDE OF DASH) HOT IN RUN OR START IGN 1 VOLT INSIDE AIR TEMPERATURE SENSOR (LEFT SIDE OF DASH, ON RIGHT OF STEERING COLUMN) LEFT COOLING FAN MOTOR LOW REF RELAY CTRL RELAY CTRL CLASS 2 SERIAL A/C COMP CLUTCH LT BLU WIRE LT BLU/BLK WIRE ORG/ WIRE PNK WIRE PPL PPL SUPPLY GND BATTERY SPEED CTRL GND RED WIRE RED/BLK WIRE RIGHT COOLING FAN MOTOR RIGHT STRUT TOWER) SIDE OF DASH, IN HVAC MODULE) SUNLOAD SENSOR ASSEMBLY (TOP CENTER OF DASH) TAN WIRE UNDERHOOD FUSE BLOCK (MOUNTED TO UPPER LEFT AIR TEMPERATURE SENSOR (CENTER OF DASH, IN LEFT VENTILATION DUCT) UPPER RIGHT AIR TEMPERATURE SENSOR (CENTER OF DASH, IN RIGHT VENTILATION DUCT) WHT WIRE YEL WIRE

23 7 ECT SENS SIG LOW REF 4 20 48 HI SPD FAN RLY LO SPD FAN RLY CLASS 2 SERIAL BLK WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) FAN 1 FUSE 29 FAN 1 RELAY 42 FAN 2 FUSE 32 FAN 2 RELAY 46 FAN 3 RELAY 43 GRY WIRE HOT AT ALL TIMES LEFT COOLING FAN MOTOR (ON LEFT SIDE OF RADIATOR) LT BLU WIRE RIGHT COOLING FAN MOTOR (ON RIGHT SIDE OF RADIATOR) TAN WIRE 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