Buick LaCrosse I (2004-2009) class 2 serial data Wiring diagrams

39 23 46 29 SWITCH SIG P SWITCH SIG C SWITCH SIG B SWITCH SIG A A/T SHIFT LOCK CONTROL SOLENOID (IN CENTER CONSOLE) AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE CLASS 2 SERIAL DATA COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) GRY WIRE GRY/WHT WIRE HAZRD FUSE HI SPD GMLAN SERIAL DATA HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PARK/NEUTRAL SIGNAL RED/BLK WIRE SUPPLY VOLTAGE TRANSMISSION CONTROL MODULE TRANSMISSION INTERNAL MODE SWITCH (IMS) P/N WHT WIRE YEL WIRE YEL/BLK WIRE

10 VOLT REF A/T SHIFT LOCK CONTROL SOLENOID (IN CENTER CONSOLE) A/T SHIFT LOCK CONTROL SOLENOID (IN CENTER CONSOLE) (IN CENTER CONSOLE) AUTOMATIC TRANSMISSION BATTERY POSITIVE VOLTAGE BLK WIRE BLK/WHT WIRE CLASS 2 SERIAL DATA COLUMN SHIFT COLUMN SHIFT CONSOLE SHIFT COMPUTER DATA LINES SYSTEM CONSOLE SHIFT DK GRN WIRE DK GRN/WHT WIRE GRY WIRE GRY/WHT WIRE HAZRD FUSE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) LOW REF LT GRN WIRE NCA WIRE ORG/ WIRE RED/BLK WIRE STOP LAMP SW SIG SUPPLY VOLTAGE SWITCH SIG A SWITCH SIG B SWITCH SIG C SWITCH SIG P TRANSMISSION INTERNAL MODE SWITCH (IMS) P/N WHT WIRE YEL WIRE YEL/BLK WIRE

2361 1551 1450 (3.6L) 3.6L 3.8L 55 23 48 DATA BUS - DATA BUS + 6 7 38 37 DATA BUS - DATA BUS + DATA BUS + DATA BUS - ABS/TCS CLASS 2 SERIAL DATA ADG CLASS 2 SERIAL DATA BCM CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 SERIAL DATA DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH) DIGITAL RADIO RECEIVER (LEFT SIDE OF TRUNK) DK BLU WIRE DK GRN WIRE ECM CLASS 2 SERIAL DATA ENGINE CONTROL MODULE (ECM) (TOP OF ENGINE) GRY WIRE HOT AT ALL TIMES ONSTAR/ ALDL FUSE HVAC CLASS 2 SERIAL DATA HVAC CONTROL MODULE (CENTER OF DASH) I/P FUSE BLOCK (BEHIND RIGHT SIDE INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (SDM) (UNDER RIGHT FRONT SEAT) INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SERIAL DATA LT BLU WIRE LT GRN WIRE MANUAL A/C AUTOMATIC A/C NCA WIRE OF DASH) ORG/ WIRE ORG/BLK WIRE PCM CLASS 2 SERIAL DATA UART SERIAL DATA PRIMARY PNK RFA CLASS 2 SERIAL DATA WIRE PNK WIRE POWER DISTRIBUTION SYSTEM PPL RADIO RADIO CLASS 2 SERIAL DATA SDM CLASS 2 SERIAL DATA SPLICE TAN WIRE TERMINATOR RESISTOR THROTTLE ACTUATOR CONTROL (TAC) MODULE (3.8L) (AT THROTTLE BODY) UART SERIAL DATA PRIMARY UART SERIAL DATA SECONDARY VEHICLE COMMUNICATION INTERFACE MODULE (VCIM) (BEHIND CENTER OF DASH) W/ ONSTAR WHT WIRE YEL WIRE

BLK WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) BRN WIRE CLASS 2 SERIAL DATA DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH) DK BLU WIRE DRIVER HEATED SEAT BACK ELEMENT (IN DRIVER'S SEAT BACK) DRIVER HEATED SEAT CUSHION ELEMENT (IN DRIVER'S SEAT CUSHION) DRIVER HEATED SEAT HIGH INDICATOR DRIVER HEATED SEAT LOW INDICATOR DRIVER HEATED SEAT SWITCH DRIVER'S HEATED SEAT RELAY (UNDER DRIVER'S SEAT FRONT PASSENGER HEATED SEAT HIGH INDICATOR FRONT PASSENGER HEATED SEAT LOW INDICATOR FRONT PASSENGER HEATED SEAT SWITCH GRY WIRE HEATED SEAT ELEMENT HEATED SEAT THERMISTOR HOT AT ALL TIMES HTD SEAT FUSE HVAC CONTROL MODULE (CENTER OF DASH) I/P FUSE BLOCK INFLATABLE RESTRAINT FRONT PASSENGER PRESENCE SYSTEM LOGIC LT GRN WIRE NCA WIRE ORG/ WIRE PASSENGER HEATED SEAT BACK ELEMENT (IN PASSENGER'S SEAT BACK) PASSENGER HEATED SEAT CUSHION ELEMENT (IN PASSENGER'S SEAT BACK) PASSENGER'S HEATED SEAT RELAY (UNDER PASSENGER'S SEAT) PNK WIRE PPL RED/WHT WIRE SPLICE PACK TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE YEL/BLK WIRE

3.6L 3.8L BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 DATA CLASS 2 SERIAL DATA COMPUTER DATA LINES SYSTEM DK GRN WIRE DR/LCK TRUNK FUSE GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) IGNITION KEY INSTRUMENT PANEL CLUSTER (IPC) LOGIC LT GRN WIRE MESSAGE CENTER ORG/ WIRE READER/ EXCITER REFERENCE SECURITY INDICATOR SERVICE THEFT SYSTEM STARTING DISABLED THEFT DETERRENT EXCITER MODULE (PART OF IGNITION KEY CYLINDER) THEFT SYSTEM NOT PROGRAMMED TRANSPONDER VOLTAGE WHT WIRE

1 2 3 4 5 6 7 8 BATTERY GROUND F CENTER OUT (+) F CENTER OUT (-) 1 2 8 L AUDIO SIG AUDIO COMMON SIG DRAIN WIRE 1-6 AMPLIFIER CTRL ANTENNA GRID (CENTER REAR OF ROOF) ANTENNA MODULE AUDIO AMPLIFIER (CENTER OF REAR COMPT) BAND BARE BLK WIRE BLK/WHT WIRE BLU WIRE BLUNT CUT) BRN WIRE BRN/WHT WIRE CENTER OF REAR WINDOW PANEL, APPROXIMATELY 90 CM FROM BREAKOUT TO REAR COMPT CENTER SPEAKER CLASS 2 SERIAL DATA COAX 1 ANTENNA SIG RADIO ON SIG ANTENNA SIG PPL COAX COAX ANTENNA SIG COMPUTER DATA LINES SYSTEM COURTESY LAMP DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DK LT LT DK GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (IN STEERING COLUMN) LEFT FRONT DOOR SPEAKER LEFT FRONT TWEETER SPEAKER LT BLU WIRE LT DK LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PPL PPL ON SIG I/P LMP VLT GROUND 8 1450 INTERIOR LIGHTS SYSTEM PPL PPL R AUDIO SIG (+) L AUDIO SIG (+) AUDIO COMMON AUDIO COMMON SIG L AUDIO SIG RADIO RDO AMP FUSE REAR SUB OUT (-) REAR SUB OUT (+) REAR WINDOW RF SPKR OUT (+) RF SPKR OUT (-) LF SPKR OUT (-) LF SPKR OUT (+) RIGHT RIGHT FRONT FRONT DOOR TWEETER SPEAKER SPEAKER RIGHT STEERING WHEEL CONTROLS SATELLITE RADIO CIRCUIT SEEK DOWN SEEK UP SIDE OF DASH) SUB- MID SUB- MID WOOFER RANGE WOOFER RANGE RIGHT REAR LEFT REAR SPEAKER SPEAKER TAN WIRE VOL DOWN VOL UP WHT WIRE YEL WIRE

1 2 8 L AUDIO SIG AUDIO COMMON SIG DRAIN WIRE BAND BARE BLK/WHT WIRE BLU WIRE BLUNT CUT) BRN WIRE BRN/WHT WIRE CLASS 2 SERIAL DATA COAX ANTENNA SIG COAX PPL COAX ANTENNA SIG RADIO ON SIG ANTENNA SIG COMPUTER DATA LINES SYSTEM DK 1-6 DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DK LT GRID (CENTER REAR OF ROOF) GRN WIRE GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL (IN STEERING COLUMN) LEFT FRONT DOOR SPEAKER LEFT FRONT TWEETER SPEAKER LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PPL PPL ON SIG PPL PPL R AUDIO SIG (+) L AUDIO SIG (+) AUDIO COMMON AUDIO COMMON SIG L AUDIO SIG RADIO RADIO AMP FUSE REAR WINDOW ANTENNA RIGHT FRONT RIGHT FRONT LEFT REAR TWEETER DOOR SPEAKER SPEAKER SPEAKER RIGHT REAR SPEAKER RIGHT STEERING WHEEL CONTROLS SATELLITE RADIO CIRCUIT SEEK DOWN SEEK UP TAN WIRE VOL DOWN VOL UP YEL WIRE

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

AIR BAG IND AIRBAG OFF AIRBAG ON B+ SEAT BELT IND BATT MAIN 1 FUSE 26 BLK WIRE BLK/WHT WIRE CASE GROUND CLASS 2 (SDM) CLASS 2 SERIAL DATA DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH) DK BLU WIRE DK GRN WIRE DRIVER SEAT BELT SWITCH (IN SEAT BELT BUCKLE) GRN WIRE GROUND GRY WIRE HEATED SEAT SIG HOT AT ALL TIMES HOT IN RUN, START I/P FUSE BLOCK (BEHIND LEFT SIDE OF DASH) IGNITION 1 INFLATABLE RESTRAINT FRONT PASSENGER PRESENCE SYSTEM (PPS) SENSOR INFLATABLE RESTRAINT PASSENGER AIR BAG ON/OFF INDICATOR INSTRUMENT PANEL CLUSTER (IPC) LEFT INFLATABLE RESTRAINT SEAT BELT PRETENSIONER (IN BOTTOM OF DRIVER'S SEAT) LOGIC LT GRN WIRE NCA WIRE ORG/ WIRE ORG/BLK WIRE PASSENGER SEAT BELT INDICATOR PASSENGER SEAT BELT SWITCH (IN BELT BELT BUCKLE) PNK WIRE PPL RED WIRE RELAY - FRONT PASSENGER) RFA/MOD FUSE SEATBELT IND SEATS SYSTEM SHORTING BAR SIR FUSE 9 UNDERHOOD FUSE BLOCK (MOUNTED TO RIGHT STRUT TOWER) WHT WIRE YEL WIRE

BATTERY BLK WIRE BODY CONTROL MODULE (BCM) (BELOW LEFT SIDE OF DASH, LEFT OF STEERING COLUMN) CLASS 2 SERIAL CLASS 2 SERIAL DATA CLSTR FUSE COMPUTER DATA LINES SYSTEM DK BLU WIRE DOOR LOCKS SYSTEM DRV DR LK SW UNLOCK SIG GROUND GRY WIRE HAZRD FUSE HOT AT ALL TIMES I/P FUSE BLOCK (BEHIND RIGHT SIDE OF DASH) INSTRUMENT PANEL CLUSTER (IPC) LID AJAR SWITCH LOGIC LT BLU WIRE LT GRN WIRE MESSAGE CENTER ORG/ WIRE ORG/BLK WIRE PAS DR LK SW UNLK SIG PNK WIRE REAR COMPARTMENT LID LATCH (IN REAR COMPT LID) RED/BLK WIRE REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) TRUNK AJAR IND TRUNK OPEN TRUNK RELEASE CONTROL