Chevrolet Cobalt I (2004-2010) serial data Wiring diagrams

30 43 44 25 RLY CTRL SERIAL DATA SERIAL DATA PRESS SENS SIG 58 4 ECT SIG LOW REF A/C CLUTCH FUSE A/C CLUTCH RELAY A/C COMPRESSOR CLUTCH (LEFT FRONT OF ENGINE) A/C COMPRESSOR CLUTCH DIODE A/C REQ SIG GND BATT IGN 1 VOLTAGE A/C REQUEST INDICATOR A/C REQUEST SIG A/C REQUEST SWITCH BLK WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) COMPUTER DATA LINES SYSTEM DK GRN WIRE DK GRN/WHT WIRE ENGINE COOLANT TEMPERATURE (ECT) SENSOR FUSE 10 LOGIC GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT W/ RUN/ CRANK RELAY ENERGIZED HVAC CONTROL MODULE (CENTER OF DASH, BELOW RADIO) HVAC/ IP IGN FUSE 16 LOGIC LOW REF LT GRN WIRE ORG/BLK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM PPL/WHT WIRE RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) YEL WIRE

A/C REQUEST INDICATOR A/C REQUEST SIG A/C REQUEST SWITCH BCM 3 FUSE BLK WIRE BLK/WHT WIRE BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER MOTOR RESISTOR (UNDER RIGHT SIDE OF DASH, NEXT TO BLOWER MOTOR) BLOWER MOTOR SWITCH BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRN WIRE COMPUTER DATA LINES SYSTEM DEFOGGER SYSTEM DK BLU WIRE DK GRN WIRE FRESH AIR INDICATOR FUSE 10 GND GND MODE DOOR CNTRL AIR TEMP DR CNTRL 5 VOLT REF OFF GROUND GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ CRANK RELAY ENERGIZED HVAC CONTROL MODULE (CENTER OF DASH, BELOW RADIO) HVAC RELAY 30 HVAC/ IP IGN FUSE 16 LAMP SUPPLY IGN 1 VOLTAGE LOGIC LOGIC RUN/ CRANK RELAY CONTROL LOW OFF LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE DOOR POS SIG MODE SWITCH ORG/ WIRE PNK PNK WIRE PNK WIRE PNK/WHT WIRE POWER DISTRIBUTION SYSTEM R DEFOG SWITCH SIG R DEFOG RELAY CNTRL A/C REQ SIG GND BATT RECIR- CULATION INDICATOR RECIR- CULATION SWITCH RED WIRE RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE TEMPERATURE CONTROL SWITCH UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) WHT WIRE WHT/BLK WIRE YEL WIRE

43 44 25 SERIAL DATA SERIAL DATA PRESS SENS SIG 58 4 ECT SIG LOW REF A/C CLUTCH RELAY A/C COMPRESSOR CLUTCH (LEFT FRONT A/C COMPRESSOR CLUTCH DIODE A/C REQ SIG GND BATT IGN 1 VOLTAGE A/C REQUEST INDICATOR A/C REQUEST SIG A/C REQUEST SWITCH AC CLTCH FUSE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) COMPUTER DATA LINES SYSTEM DK GRN WIRE DK GRN/WHT WIRE FUSE 10 GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT W/ RUN/ CRANK RELAY ENERGIZED HVAC CONTROL MODULE (CENTER OF DASH, BELOW RADIO) HVAC/ IP IGN FUSE 16 LOGIC LOW REF LT GRN WIRE OF ENGINE) ORG/BLK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM RED/WHT WIRE RLY CTRL SERIAL DATA TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) YEL WIRE

A/C REQUEST INDICATOR A/C REQUEST SIG A/C REQUEST SWITCH BCM 3 FUSE BLK WIRE BLK/WHT WIRE BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER MOTOR RESISTOR (UNDER RIGHT SIDE OF DASH, NEXT TO BLOWER MOTOR) BLOWER MOTOR SWITCH BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRN WIRE COMPUTER DATA LINES SYSTEM DEFOGGER SYSTEM DK BLU WIRE DK GRN WIRE FRESH AIR INDICATOR FUSE 10 GND GND MODE DOOR CNTRL AIR TEMP DR CNTRL 5 VOLT REF OFF GROUND GRY WIRE HOT AT ALL TIMES HOT W/ RUN/ CRANK RELAY ENERGIZED HVAC CONTROL MODULE (CENTER OF DASH, BELOW RADIO) HVAC RELAY 30 HVAC/ IP IGN FUSE 16 LAMP SUPPLY IGN 1 VOLTAGE LOGIC LOGIC RUN/ CRANK RELAY CONTROL LOW OFF LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE DOOR POS SIG MODE SWITCH ORG/ WIRE PNK PNK WIRE PNK WIRE PNK/WHT WIRE POWER DISTRIBUTION SYSTEM R DEFOG SWITCH SIG R DEFOG RELAY CNTRL A/C REQ SIG GND BATT RECIR- CULATION INDICATOR RECIR- CULATION SWITCH RED WIRE RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE TEMPERATURE CONTROL SWITCH UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) WHT WIRE WHT/BLK WIRE YEL WIRE

2.2L 2.4L ABS INDICATOR BATT POS VOLTAGE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH) BRAKE FLUID LEVEL SENSOR SIGNAL BRAKE FLUID LEVEL SWITCH (IN REAR OF ENGINE COMPT, ATTACHED TO MASTER CYLINDER) BRAKE INDICATOR CLSTR FUSE COMPUTER DATA LINES SYSTEM DK GRN WIRE ENGINE CONTROL MODULE (ECM) (LEFT SIDE OF ENGINE COMPT, IN FRONT OF GROUND HI SPD GMLAN SER DATA - HI SPD GMLAN SERIAL DATA HOT AT ALL TIMES IGN INSTRUMENT PANEL CLUSTER LEFT REAR WHEEL SPEED SENSOR (WSS) (INSIDE LEFT REAR WHEEL HUB) LO SPD GMLAN SERIAL DATA LOGIC LOW SPD GMLAN SER DATA LT BLU WIRE ON RIGHT SIDE OF CENTER CONSOLE) ORG/ WIRE PARK BRAKE SWITCH (IN CENTER CONSOLE, ATTACHED TO PARKING BRAKE) PARK BRAKE SWITCH SIGNAL PNK WIRE RED WIRE RED/WHT WIRE SERIAL DATA TAN WIRE TAN/BLK WIRE TRACTION OFF IND UNDERHOOD FUSE BLOCK

2.2L 2.4L ABS INDICATOR BATT POS VOLTAGE BLK WIRE BLK/WHT WIRE BLU LT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF BRAKE BOOSTER VACUUM SENSOR BRAKE FLUID LEVEL SENSOR SIGNAL BRAKE FLUID LEVEL SWITCH (IN REAR OF ENGINE COMPT, ATTACHED TO MASTER CYLINDER) BRAKE INDICATOR CENTER CONSOLE CLSTR FUSE COMPUTER DATA LINES SYSTEM DATA - HI SPD GMLAN SERIAL DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (LEFT SIDE OF ENGINE COMPT, IN FRONT OF GROUND GRY WIRE HI SPD GMLAN SER DATA - HI SPD GMLAN SERIAL DATA HOT AT ALL TIMES IGN INSTRUMENT PANEL CLUSTER LO SPD GMLAN SERIAL DATA LOGIC LOW SPD GMLAN SER DATA LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE SWITCH (IN CENTER CONSOLE, ATTACHED TO PARKING BRAKE) PNK WIRE PRAKE BRAKE SWITCH SIGNAL RED/WHT WIRE SERIAL DATA SWITCH TAN WIRE TAN/BLK WIRE TRACTION CONTROL TRACTION CONTROL SWITCH SIGNAL TRACTION OFF IND UNDERHOOD FUSE BLOCK

BATTERY BATTERY CURRENT SENSOR (REAR COMPT, ON NEGATIVE BATTERY CABLE, NEAR BATTERY) BLK WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) CHARGING INDICATOR IGN 1 VOL COMPUTER DATA LINES SYSTEM CURRENT 5 VOLT SENSOR REF SIG DK GRN WIRE FUSIBLE LINK GEN FILD CYC SIG GEN TURN ON SIG GENERATOR GRY WIRE HI SPEED GMLAN SERIAL DATA - HOT W/ RUN/ CRANK RELAY ENERGIZED HVAC/ IP IGN FUSE 16 IGN INSTRUMENT PANEL CLUSTER (IPC) LO SPD GMLAN SERIAL DATA LOGIC ORG/ WIRE PNK WIRE POWER DISTRIBUTION SYSTEM RED WIRE SERIAL DATA STARTER TAN WIRE TAN/WHT WIRE WHT WIRE

3 4 10 524 HEADLAMP SW SIG HIGH BEAM SIGNAL PPL 71 44 54 592 1969 317 DRL RLY CTRL HI BEAM RLY CTRL FOG LMP RLY CTRL AMBIENT LIGHT SENSOR (DASH TRIM PAD, NEAR WINDSHIELD ON DRIVER'S SIDE) BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRN WIRE COMPUTER DATA LINES SYSTEM DK GRN WIRE DRL PCB RELAY FOG LAMP FUSE FOG LAMP IND FOG LAMP PCB RELAY FOG LAMP SWITCH FTP GRY WIRE HEAD HI BEAM PCB RELAY HIGH BEAM HIGH BEAM IND HOT AT ALL TIMES IGN INSTRUMENT PANEL CLUSTER (IPC) LEFT HEADLAMP LO BEAM PCB RELAY LOGIC LOW BEAM LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE LT HI BEAM FUSE LT LO BEAM FUSE DRL FUSE OFF AUTO PARK ORG/ WIRE PARK BRAKE SW SIG PARK BRAKE SWITCH (IN CENTER CONSOLE, ATTACHED TO PARKING BRAKE) PNK WIRE PNK/WHT WIRE PPL PPL PPL PPL/WHT WIRE RIGHT FRONT FOG LAMP LEFT FRONT FOG LAMP RIGHT HEADLAMP RT HI BEAM FUSE RT LO BEAM FUSE SERIAL DATA STEERING COLUMN) TAN WIRE TAN/WHT WIRE TURN SIGNAL/ MULTI-FUNCTION SWITCH UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) WHT WIRE YEL WIRE YEL/BLK WIRE

39 24 PPL 1589 2759 FUEL LVL SENS SIG LOW REF 44 43 2501 2500 GMLAN SER DATA- GMLAN SER DATA+ ABS IND. AIR BAG IND AJAR SWITCH ANTI-THEFT SYSTEM BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRAKE FLUID LEVEL SWITCH (IN REAR OF ENGINE COMPT, ATTACHED TO MASTER CYLINDER) BRAKE IND BRN/WHT WIRE CHARGING IND CLSTR FUSE 7 COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DIC SW SIG DK GRN WIRE DK GRN/WHT WIRE DOOR HINGES) DRIVER DOOR AJAR SWITCH DOOR HINGES) FRONT PASSENGER DOOR AJAR SWITCH DRIVER INFORMATION CENTER (DIC) ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM INTERIOR LIGHTS SYSTEM ENGINE COOLANT TEMPERATURE IND ENGINE OIL PRESSURE (EOP) SWITCH FRONT FOG LAMP IND FUEL LEVEL FUEL PUMP, SENDER ASSEMBLY (INSIDE FUEL TANK) GMLAN SER DATA GRY WIRE GRY/BLK WIRE HIGH BEAM IND HOT AT ALL TIMES HOT W/ RUN/CRNK RELAY ENERGIZED HVAC/ IP IGN FUSE 16 IGN IGN 1 VOLT BAT GND GND INSTRUMENT PANEL CLUSTER (IPC) LEFT TURN IND LOGIC LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE MALFUNCTION IND MIL CTRL OIL LEVEL IND OIL PRES SW SIG PARK BRAKE SWITCH (IN CENTER CONSOLE, ATTACHED TO PARKING BRAKE) PNK PNK WIRE PNK WIRE PNK/ORG WIRE POWER DISTRIBUTION SYSTEM PPL RED WIRE RED/WHT WIRE RIGHT TURN IND SEAT BELT IND SECURITY IND SECURITY IND SPLY VOLT SERIAL DATA SPEEDOMETER TACHOMETER TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRACTION OFF IND TRIP ODOMETER TRIP RESET UP SHIFT IND VF DISPLAY TRIP WHT WIRE

1 2 9 L AUDIO SIG (+) R AUDIO SIG (+) AUDIO COMMON 5 6 7 8 9 10 11 12 13 14 15 16 SERIAL DATA BARE BATTERY VOLT BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRN/WHT WIRE COAX ANT SIG COMPUTER DATA LINES SYSTEM DIGITAL RADIO ANTENNA (REAR CENTER OF ROOF) DK GRN WIRE DK GRN/WHT WIRE GROUND AUDIO COMMON DRAIN WIRE HOT AT ALL TIMES L AUDIO SIG (+) R AUDIO SIG (+) POWER DISTRIBUTION SYSTEM RADIO RED WIRE RED/WHT WIRE SERIAL DATA TAN/WHT WIRE WHT WIRE XM/ ONSTAR FUSE 24