Buick LaCrosse I (2004-2009) display fuse 18 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

9 39 25 48 49 A/C PRESS SIGNAL A/C CLU DIODE A/C CLUTCH FUSE 13 A/C COMP RELAY 38 A/C COMPRESSOR CLUTCH SOLENOID A/C COMPRESSOR TEMPERATURE SWITCH A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, ON ACCUMULATOR) A/C REQUEST IND A/C REQUEST SWITCH BATTERY IGN 1 VOLT CLASS 2 SERIAL BLK WIRE BLK/WHT WIRE COMPUTER DATA LINES SYSTEM DISPLAY FUSE 18 DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) ENGINE CONTROLS SYSTEM GROUND GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START HVAC CONTROL MODULE (CENTER OF DASH) HVAC FUSE I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LOGIC LOW REF CLASS 2 SERIAL A/C COMP CLUTCH NCA WIRE ORG/ WIRE PNK WIRE RED/BLK WIRE UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE

12 13 14 15 16 PPL 31 4 7 50 48 15 33 A/C PRESS SIGNAL 55 29 ECT SENS SIG LOW REF A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, 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 COOLANT TEMPERATURE (ECT) SENSOR (ON TOP RIGHT OF INTAKE MANIFOLD) 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 ON ACCUMULATOR) 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

31 4 7 15 33 A/C PRESS SIGNAL A/C CLU DIODE A/C CLUTCH FUSE 13 A/C COMP RELAY A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, ON ACCUMULATOR) A/C REQUEST IND A/C REQUEST SWITCH AUTOMATIC A/C BATTERY IGNITION 1 BLK WIRE BLK/WHT WIRE CLASS 2 SERIAL COMPUTER DATA LINES SYSTEM DISPLAY FUSE 18 DK GRN WIRE DK GRN/WHT WIRE GROUND GRY WIRE HARNESS, APPROXI- MATELY 20 CM FROM HOT AT ALL TIMES HOT AT ALL TIMES I/P FUSE BLOCK HVAC FUSE (BEHIND RIGHT SIDE OF DASH) HOT IN RUN OR START HVAC CONTROL MODULE (CENTER OF DASH) LOGIC LOW REF CLASS 2 SERIAL A/C COMP CLUTCH MANUAL A/C ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) RED/BLK WIRE TOWARDS BRAKE PEDAL POSITION SENSOR) UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE

380 2700 2751 473 335 1049 31 4 7 50 48 15 33 A/C PRESS SIGNAL 55 29 410 2761 ECT SENS SIG LOW REF A/C CLU DIODE A/C CLUTCH FUSE 13 A/C COMP RELAY A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, ON ACCUMULATOR) A/C REQUEST IND A/C REQUEST SWITCH AIR TEMP B AIR TEMP A RECIRCULATION B RECIRCULATION A AIR TEMPERATURE ACTUATOR (RIGHT SIDE OF HVAC ASSEMBLY) BATT MAIN 4 FUSE 30 BATTERY IGNITION 1 BLK WIRE BLK/WHT WIRE BLOWER MOTOR (BEHIND RIGHT SIDE OF DASH, IN HVAC MODULE) BLOWER MOTOR CONTROL PROCESSOR (ON LOWER RIGHT SIDE OF DASH) BREAKOUT TO DATA LINK CONNECTOR TOWARDS BRAKE PEDAL POSITION SENSOR) CLASS 2 SERIAL COMPUTER DATA LINES SYSTEM DEFOGGER IND REAR DEFOGGER SWITCH DISPLAY FUSE 18 DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (ON TOP RIGHT OF INTAKE MANIFOLD) FAN 1 FUSE 29 FAN 1 RELAY 42 FAN 2 FUSE 32 FAN 2 RELAY 46 FAN 3 RELAY 43 GROUND GRY WIRE GRY/BLK WIRE HARNESS, APPROXI- MATELY 20 CM FROM HIGH LOW HOT AT ALL TIMES HOT AT ALL TIMES I/P FUSE BLOCK HVAC FUSE (BEHIND RIGHT SIDE OF DASH) HOT IN RUN OR START HVAC CONTROL MODULE (CENTER OF DASH) ILLUM ILLUM INTERIOR 8 1450 LIGHTS SYSTEM LEFT COOLING FAN MOTOR (ON LEFT SIDE OF RADIATOR) LOGIC LOW REF HIGH SPD COOLING LOW SPD COOLING CLASS 2 SERIAL A/C COMP CLUTCH LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE MODE ACTUATOR (LOWER LEFT SIDE OF HVAC ASSEMBLY) MODE SWITCH OFF BLOWER MOTOR SW ORG/ WIRE PNK WIRE PNK/WHT WIRE PPL PPL SUPPLY GND BATTERY SPEED CTRL GND RECIRCULATION ACTUATOR (NEAR RIGHT "A" PILLAR, ON UPPER HVAC CASE) RECIRCULATION IND RECIRCULATION SWITCH RED WIRE RED/BLK WIRE RIGHT COOLING FAN MOTOR (ON RIGHT SIDE OF RADIATOR) RIGHT STRUT TOWER) SPEED CTRL MODE DOOR B MODE DOOR A TAN WIRE TEMPERATURE CONTROL SW TOWARDS BRAKE PEDAL POSITION SENSOR) UNDERHOOD FUSE BLOCK (MOUNTED TO 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

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