Buick LaCrosse II (2009-2013) serial data Wiring diagrams

BATTERY (LEFT SIDE OF ENGINE) BATTERY CURRENT SENSOR (IN FRONT OF BATTERY) BATTERY FUSE BLOCK (TOP OF BATTERY) FUSE BLK WIRE BLK/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRN WIRE CHARGE IND CTRL COMPUTER DATA LINES SYSTEM CURRENT SENS CURRENT SENS SIG CURRENT SENS SUPPLY VOLT CURRENT SENSOR SIG CURRENT SENSOR SUPPLY VOLTAGE DK BLU/VIO WIRE DRIVER CHARGE INFORMATION IND CENTER DISPLAY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) GENERATOR (RIGHT FRONT CORNER OF ENGINE) GENERATOR FIELD DUTY CYCLE SIG GMLAN SERIAL DATA GRN WIRE GROUND GRY WIRE INSTRUMENT CLUSTER LOGIC LOW REF RED WIRE SERIAL DATA STARTER MOTOR VIO/YEL WIRE WHT/YEL WIRE

A/C COMPRESSOR SOLENOID VALVE A/C LOW REF A/C REFRIGERANT PRESSURE SENSOR (FRONT OF ENGINE COMPT, MOUNTED TO CONDENSER) A/C SENS SIG BATT+ VOLT BLK WIRE BLK/BRN WIRE BLK/WHT WIRE BRN/RED WIRE COMPUTER DATA LINES SYSTEM DATA DK BLU WIRE DK BLU/LT GRN WIRE ELECTRIC CTRL ELECTRIC SPLY ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EXCEPT 3.6L 3.6L FUSE GRN WIRE HOT AT ALL TIMES HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) HOT W/ IGNITION MAIN RELAY ENERGIZED HVAC CONTROL MODULE IGN 1 VOLT LT GRN WIRE RED/BRN WIRE RED/WHT WIRE SERIAL DATA SIG GND UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/GRY WIRE WHT WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 BATTERY SOL CTRL 3.0L 2.4L 3.6L 5 6 14 DATA + DATA - SPLY VOLT ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION ASSEMBLY BLK WIRE BLK/YEL WIRE BLU/YEL WIRE BRN/GRN WIRE BRN/LT GRN WIRE COMPUTER DATA LINES COMPUTER DATA LINES SYSTEM CONTROL SOLENOID VALVE ASSEMBLY DK BLU (OR YEL/BLK) WIRE DK BLU WIRE DK GRN/BN WIRE DRIVER INFORMATION CENTER DISPLAY ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) FUSE GRN WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LOGIC LT GRN/BRN WIRE POWER STEERING CONTROL MODULE (LOWER LEFT SIDE OF DASH) RED WIRE RED/DK BLU WIRE SERIAL DATA SERIAL DATA (-) SERIAL DATA (+) SHAFT SPEED SENSOR SOL LO REF STEERING ANGLE SENSOR (BASE OF STEERING COLUMN) SYSTEM TRANS- MISSION OUTPUT TRANSMISSION CONTROL MODULE (TCM) UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT (OR YEL) WIRE WHT WIRE WHT/DK BLU WIRE

1 2 3 4 5 6 POS VOLT GND VOLT AJAR SW SIG BATT FUSE BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRY WIRE BLK/LT GRN WIRE BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU/BLK WIRE DK BLU/WHT WIRE GRN WIRE GRN/GRY WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES IGNITION MODE SWITCH KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LOW REF (7) SIG (6) LOW REF (6) SIG (8) LOW REF (8 SIG (7) LT GRN WIRE LT GRN/BLK WIRE MTR FUSE WHEELHOUSE) NETWORK BUS 4 PASSENGER DOOR LATCH ASSEMBLY POS VOLT GND PPL PPL REAR BODY FUSE BLOCK (ON LEFT REAR RED/DK BLU WIRE RED/WHT WIRE RIGHT REAR DOOR LATCH ASSEMBLY RR LATCH CTRL LR LATCH CTRL PASS DR LATCH CTRL DRV DR LATCH CTRL RR UNLATCH CTRL LR UNLATCH CTRL PASS DR UNLATCH CTRL DRV DR UNLATCH CTRL SERIAL DATA SW MODE CTRL LOW REF VIO/BLK WIRE VIO/DK BLU WIRE VIO/YEL WIRE WHT/LT GRN WIRE WHT/YEL WIRE YEL/BLK WIRE

1 2 3 4 5 6 POS VOLT GND VOLT AJAR SW SIG BATT FUSE BLK WIRE BLK/BRN WIRE BLK/DK BLU WIRE BLK/GRY WIRE BLK/LT GRN WIRE BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU/BLK WIRE DK BLU/WHT WIRE GRN WIRE GRN/GRY WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES IGNITION MODE SWITCH KEYLESS ENTRY CONTROL MODULE (RIGHT KICK PANEL) LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LOW REF (7) SIG (6) LOW REF (6) SIG (8) LOW REF (8 SIG (7) LT GRN WIRE LT GRN/BLK WIRE MTR FUSE WHEELHOUSE) NETWORK BUS 4 PASSENGER DOOR LATCH ASSEMBLY POS VOLT GND PPL PPL REAR BODY FUSE BLOCK (ON LEFT REAR RED/DK BLU WIRE RED/WHT WIRE RIGHT REAR DOOR LATCH ASSEMBLY RR LATCH CTRL LR LATCH CTRL PASS DR LATCH CTRL DRV DR LATCH CTRL RR UNLATCH CTRL LR UNLATCH CTRL PASS DR UNLATCH CTRL DRV DR UNLATCH CTRL SERIAL DATA SW MODE CTRL LOW REF VIO/BLK WIRE VIO/DK BLU WIRE VIO/YEL WIRE WHT/LT GRN WIRE WHT/YEL WIRE YEL/BLK WIRE

AUTOMATIC TRANSMISSION ASSEMBLY AUTOMATIC TRANSMISSION INTERNAL MODE SWITCH BATTERY (LEFT SIDE OF ENGINE) BATTERY FUSE BLOCK (TOP OF BATTERY) FUSE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) CHARGING CIRCUIT COMPUTER DATA LINES SYSTEM CONTROL SOLENOID ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) EXCEPT 2.4L 2.4L FUSE GMLAN SERIAL DATA GRN WIRE GROUND GRY WIRE IGN VOLT IGNITION SWITCH LOCK PARK/NEUTRAL SIG (1) RED WIRE RUN WIRE SERIAL DATA STARTER MOTOR STARTER RELAY STARTER RELAY CTRL TRANSMISSION CONTROL MODULE UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VALVE ASSEMBLY VIO/GRY WIRE VIO/YEL WIRE WHT WIRE WHT/GRY WIRE YEL WIRE

AJAR SW SIG 1 BATT POS VOLT BLK WIRE BODY CONTROL MODULE (BCM) (LEFT SIDE OF DASH) BRN/DK BLU WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/YEL WIRE EXTERIOR REAR COMPARTMENT LID UNLATCH SWITCH FUSE FUSE OF DASH) GRY WIRE GRY/YEL WIRE HANDLE SW OPEN SIG HOT AT ALL TIMES INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE MTR RELEASE CTRL PPL/WHT WIRE REAR COMPARTMENT LID LATCH (IN TRUNK LID) REAR COMPARTMENT LID UNLATCH RELAY RED/WHT WIRE SERIAL DATA VIO/GRY WIRE WHT WIRE YEL WIRE

BLK WIRE BLK/GRN WIRE BLK/LT GRN WIRE BLK/YEL WIRE BLU/BRN WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE CENTER (DIC) COMMUNICATION COMPUTER DATA LINES SYSTEM DATA DISPLAY DK BLU WIRE DK BLU/BLK WIRE DK BLU/WHT WIRE ENABLE ENGINE FLP SENS FPP RLY CTRL FUEL PRESSURE SENSOR (IN FUEL TANK) FUEL PUMP CONTROL MODULE (RIGHT REAR CORNER OF REAR COMPT) FUSE FUSE FUSE GMLAN SERIAL GMLAN SERIAL DATA GRN WIRE GROUND GRY WIRE GRY/DK BLU WIRE HOT AT ALL TIMES HOT W/ ENGINE CONTROL RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED IGN IGN 1 VOLT INFORMATION INSTRUMENT CLUSTER LOGIC LOW REF LT GRN/DK BLU WIRE LT GRN/GRY WIRE MIL IND NCA WIRE PRESS SENS SIG RED/BRN WIRE RED/LT GRN WIRE RED/VIO WIRE RED/WHT WIRE RUN/CRANK SECONDARY AIR INJECTION PUMP RELAY SECONDARY AIR INJECTION SOLENOLD VALVE RELAY SERIAL DATA SHIELD EXTENSION SPLY VOLT FUEL PUMP UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) USED) VIO/BLK WIRE VIO/DK BLU WIRE VIO/LT GRN WIRE WHT WIRE WHT/DK BLU WIRE YEL WIRE