Buick LaCrosse I (2004-2009) blk Wiring diagrams

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 REQUEST IND A/C REQUEST SWITCH AIR TEMP A AIR TEMP B AIR TEMP A AIR TEMP B AUTO OFF BLOWER MOTOR SW BATTERY IGN 1 VOLT CLASS 2 SERIAL BLK WIRE BLK/WHT WIRE BRN WIRE COMPUTER DATA LINES SYSTEM 8 1450 734 720 INTERIOR LIGHTS SYSTEM DEFOGGER IND DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE 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 HIGH LOW HOT AT ALL TIMES HOT IN RUN OR START HVAC CONTROL MODULE (CENTER OF DASH) ILLUM LOGIC LOWER LEFT AIR TEMPERATURE SENSOR (BEHIND HVAC CONTROL MODULE) LOWER RIGHT AIR TEMPERATURE SENSOR (BEHIND HVAC CONTROL MODULE) LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE ACTUATOR (LOWER LEFT SIDE OF HVAC ASSEMBLY) MODE DOOR A MODE DOOR B MODE SWITCH NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/WHT WIRE PPL REAR DEFOGGER SWITCH RECIRATION A RECIRATION B RECIRCULATION ACTUATOR (NEAR RIGHT "A" PILLAR, ON UPPER HVAC CASE) RECIRCULATION IND RECIRCULATION SWITCH SENSOR SIG SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG SENSOR SIG LOW REF PPL SPEED CTRL TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TEMPERATURE CONTROL SW UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE WHT/BLK WIRE YEL WIRE

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 8 1450 734 720 INTERIOR LIGHTS SYSTEM A/C CLU DIODE A/C CLUTCH FUSE 13 A/C COMP RELAY 38 AUTO OFF BLOWER MOTOR SW BATTERY IGN 1 VOLT CLASS 2 SERIAL BLK WIRE BLK/WHT WIRE BRN WIRE COMPUTER DATA LINES SYSTEM DEFOGGER IND DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE 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 HIGH LOW HOT AT ALL TIMES HOT IN RUN OR START HVAC CONTROL MODULE (CENTER OF DASH) ILLUM LOGIC LOWER LEFT AIR TEMPERATURE SENSOR (BEHIND HVAC CONTROL MODULE) LOWER RIGHT AIR TEMPERATURE SENSOR (BEHIND HVAC CONTROL MODULE) LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE ACTUATOR (LOWER LEFT SIDE OF HVAC ASSEMBLY) MODE SWITCH ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/WHT WIRE REAR DEFOGGER SWITCH RECIRCULATION ACTUATOR (NEAR RIGHT "A" PILLAR, ON UPPER HVAC CASE) RECIRCULATION IND RECIRCULATION SWITCH REQUEST SWITCH A/C A/C REQUEST IND SENSOR SIG SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG LOW REF SENSOR SIG SENSOR SIG LOW REF PPL SPEED CTRL TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TEMPERATURE CONTROL SW UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE WHT/BLK WIRE YEL 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

15 21 PCM CLASS 2 SER DATA ENG SPEED SIG 3.6L 3.6L W/ ACTIVE BRAKE CONTROL 3.8L 48 15 5 37 ECM CLASS 2 SER DATA REQ TORQUE SIG ENG SPEED SIG DEL TORQUE SIG ABS FUSE 23 ABS MTR FUSE 31 ABS SOL FUSE 19 B+ MOTOR CONTROL B+ SOL VALVE CONTROL BLK WIRE BLK/WHT WIRE BRAKE PRESSURE MODULATOR VALVE (BPMV) BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE ENG SPEED SIG (3.8L) HI SPD GMLAN SER DATA - (3.6L) ENGINE CONTROL MODULE (3.6L) (TOP OF ENGINE) ENGINE CONTROLS SYSTEM GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT W/ IGN 1 RELAY ENERGIZED HSV 2 (W/ TCS) LEFT FRONT INLET LEFT FRONT OUTLET LEFT REAR OUTLET LT BLU WIRE MAGNASTEER ACTUATOR (ON STEERING RACK ASSEMBLY) ORG/ WIRE ORG/BLK WIRE PNK PNK WIRE PNK WIRE PUMP MOTOR RED WIRE RIGHT FRONT INLET RIGHT LEFT FRONT REAR INLET OUTLET RIGHT REAR INLET RIGHT USV 1 (W/ TCS) REAR (W/ TCS) OUTLET SOLENOID VALVES TAN WIRE TAN/BLK WIRE TAN/WHT WIRE UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) USV 2 (W/ TCS) W/ ACTIVE BRAKE CONTROL W/ TRACTION CONTROL W/O ACTIVE BRAKE CONTROL WHT WIRE YEL WIRE

5 3 1 2 6 4 LATERAL ACCELEROMETER SIG IGN 1 VOLT PNK WIRE ABS IND. ABS/TCS CLASS 2 SER DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRAKE FLUID PRESSURE SENSOR BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DRIVER INFORMATION CENTER (DIC) GROUND GRY WIRE GRY/BLK WIRE HI SPD GMLAN SER DATA - IGN 1 VOLT INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SER DATA LO TRACTION LOGIC LT BLU WIRE LT GRN WIRE MESSAGE CENTER TCS FAIL NCA WIRE ORG/ WIRE PNK PNK WIRE PNK WIRE RED WIRE RIGHT REAR WHEEL SPEED SENSOR (WSS) STEERING ANGLE SENSOR (AT BASE OF STEERING COLUMN) STEERING COLUMN) STOP LAMP SW SIG TAN WIRE TAN/WHT WIRE TRACTION CONTROL OFF IND TRACTION CONTROL SWITCH (UPLEVEL) WHT WIRE YAW RATE TEST CNTRL GROUND YAW RATE SEN SIG YAW, LATERAL ACCELERATION SENSOR (UNDER THE REAR SIDE OF CENTER CONSOLE) YEL WIRE

4 3 2 1 VOLT (+) AJAR DOOR LOCK AJAR INDICATOR SWITCH BLK WIRE BLK/WHT WIRE BLU WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 COAX ANTENNA SIG COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/WHT WIRE DOOR AJAR INDICATOR DOOR AJAR TRUNK AJAR DOOR LOCK ACTUATOR DOOR LOCK CYLINDER SWITCH DOOR LOCK OPEN INDICATOR SWITCH DR/LCK TRUNK FUSE DRIVER DOOR LOCK (IN REAR SIDE OF DRIVER'S DOOR) DRIVER DOOR LOCK SWITCH FRONT PASSENGER DOOR LOCK (IN REAR SIDE OF FRONT PASSENGER'S DOOR) FRONT PASSENGER DOOR LOCK SWITCH GRY WIRE GRY/BLK WIRE HORNS SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INSTRUMENT PANEL CLUSTER (IPC) LEFT REAR DOOR LOCK (IN REAR SIDE OF LEFT REAR PASSENGER'S DOOR) LOCK LOCK UNLOCK LOGIC LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MESSAGE CENTER NCA WIRE ORG/ WIRE ORG/BLK WIRE PASSENGER SEAT, APPROXIMATELY 26 CM FROM SECOND PNK RFA SER DATA GROUND WIRE POWER DISTRIBUTION SYSTEM PPL REAR COMPARTMENT LID LATCH (IN REAR COMPT LID) RED WIRE RED/BLK WIRE REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) RFA/MOD FUSE RIGHT REAR DOOR LOCK (IN REAR SIDE OF RIGHT REAR PASSENGER'S DOOR) SECURITY INDICATOR TAN WIRE THEFT LED TOWARDS INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE) TRUNK AJAR INDICATOR UNLOCK W/ DIGITAL AUDIO SYSTEM WHT WIRE YEL WIRE YEL/BLK WIRE