Chevrolet Cobalt I (2004-2010) (under driver's seat) Wiring diagrams

2 20 SERIAL DATA + SERIAL DATA - 5 49 43 44 RLY CTRL RLY CTRL SERIAL DATA SERIAL DATA 58 4 ECT SIG LOW REF BLK WIRE BLU WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) COMPUTER DATA LINES SYSTEM COOLING FAN 1 FUSE COOLING FAN 1 RELAY COOLING FAN 2 FUSE COOLING FAN 2 RELAY COOLNT SW DK BLU WIRE DK GRN WIRE DK LT ENGINE COOLANT TEMPERATURE (ECT) SENSOR (REAR OF ENGINE, NEAR EXHAUST MANIFOLD) ENGINE COOLING FAN (FRONT OF ENGINE COMPT, ATTACHED TO RADIATOR) GRN WIRE GRY WIRE HOT AT ALL TIMES LT GRN WIRE TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) YEL WIRE

2 20 SERIAL DATA + SERIAL DATA - 5 43 44 49 RLY CTRL SERIAL DATA SERIAL DATA RLY CTRL 58 4 ECT SIG LOW REF BLK WIRE BLU WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) COMPUTER DATA LINES SYSTEM COOLING FAN 1 FUSE COOLING FAN 1 RELAY COOLING FAN 2 FUSE COOLING FAN 2 RELAY COOLNT SW DK BLU WIRE DK GRN WIRE ENGINE COOLANT TEMPERATURE ENGINE COOLING FAN (FRONT OF ENGINE COMPT, ATTACHED TO RADIATOR) ENGINE COOLING FAN RESISTOR (LOWER LEFT RADIATOR SHROUD) GRN WIRE GRY WIRE HOT AT ALL TIMES LT BLU WIRE LT GRN WIRE TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) 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

2 20 SERIAL DATA + SERIAL DATA - 28 747 746 1250 748 745 744 5531 109 HORNS SYSTEM 43 44 GMLAN SERIAL DATA + GMLAN SERIAL DATA - ACC VOLT SIG ACC VOLT SUPPLY BATT POS VOLT BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) BRN WIRE CLSTR FUSE 7 COMPUTER DATA LINES SYSTEM DK GRN WIRE DRIVER RIGHT REAR DOOR JAMB SWITCH DOOR JAMB SWITCH FUSE 10 GMLAN SERIAL DATA GRN WIRE GROUND GRY WIRE GRY/BLK WIRE HAZARD SW SIG HOOD AJAR SWITCH (W/ KEYLESS ENTRY) (FRONT OF VEHICLE, PART OF HOOD LATCH) HOT AT ALL TIMES HVAC IGN KEY RES SIG IGNITION SWITCH INSTRUMENT PANEL CLUSTER (IPC) LEFT REAR DOOR JAMB SWITCH LOGIC LOGIC SECURITY IND SUPPLY VOLTAGE LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE OFF OFF/RUN/CRANK ORG/ WIRE ORG/BLK WIRE PASSENGER DOOR JAMB SWITCH POWER DISTRIBUTION SYSTEM PPL REAR COMPARTMENT LID RELEASE ACTUATOR (IN LATCH ASSEMBLY) RED WIRE RED/WHT WIRE RUN WIRE SECURITY IND SECURITY INDICATOR TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THEFT DETERRENT CONTROL MODULE (IN STEERING COLUMN, NEAR IGNITION SWITCH) WHT WIRE WHT/BLK WIRE

A/T SHIFT LK CTRL SOL SPLY VOL AMBIENT AIR TEMP SENS SIG DRL RELAY CONTROL AMBIENT AIR TEMPERATURE SENSOR (RIGHT SIDE OF LEFT HEADLIGHT) BATT POS VOL BLK WIRE BLK/WHT WIRE BLU 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) BRN WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR LOCK LOCK/UNLOCK SIG DOOR LOCK LOCK/UNLOCK SIG PARK LAMP RLY CTRL DOOR LOCKS SYSTEM DOOR LOCKS SYSTEM EXTERIOR LIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM COMPUTER DATA LINES SYSTEM FOG LMP RLY CTRL REAR COMPT LID AJAR SW SIG GND LOW REF GRY WIRE GRY/BLK WIRE HEADLAMP HIGH BEAM RLY CTRL HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM HOOD CLOSED SWITCH SIGNAL HOOD AJAR SWITCH SIGNAL HORN RLY CTRL GND BAT POS VOLTAGE HORNS SYSTEM HOT AT ALL TIMES INT LIGHT FUSE 27 LEFT FRONT TURN SIG LAMP SPLY VOL LOW SPD GMLAN SERIAL DATA LF DOOR AJAR SW SIG LOGIC LOW REF LOW REF CURRENT SENSOR SIG LR DOOR AJAR SW ISG LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE ORG/BLK WIRE PARK BRAKE SWITCH (IN CENTER CONSOLE, ATTACHED TO PARKING BRAKE) PNK WIRE PPL RED/WHT WIRE SEDAN SHIFT INTERLOCK SYSTEM STARTING/CHARGING SYSTEM STARTING/CHARGING SYSTEM DOOR LOCKS SYSTEM TAN WIRE TAN/BLK WIRE TAN/WHT WIRE TRUNK RELEASE RLY CTRL TRUNK, TAILGATE, FUEL DOORS SYSTEM WHT WIRE WINDSHIELD WIPER MTR PRK SW SIG WINDSHIELD WIPER SW ON SIG WIPER/WASHER SYSTEM YEL WIRE YEL/BLK WIRE

BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BCM) (UNDER CENTER DASH, ON RIGHT SIDE OF CENTER CONSOLE) CTSY LPS CTRL CTSY LPS SUPPLY DIODE DK BLU WIRE DK BLU/WHT WIRE DOME LAMP DOOR DRIVER DOOR AJAR SWITCH (LOWER LEFT "A" PILLAR BETWEEN DOOR HINGES) FRONT PASSENGER DOOR AJAR SWITCH (LOWER RIGHT "A" PILLAR BETWEEN DOOR HINGES) GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES INSIDE REARVIEW MIRROR INT LIGHT FUSE 27 LEFT REAR DOOR AJAR SWITCH (SEDAN) (CENTER OF LEFT "B" PILLAR BETWEEN HINGES) LOGIC LR DOOR AJAR RF DOOR AJAR GROUND RR DOOR AJAR LF DOOR AJAR LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE OFF ON ORG/ WIRE ORG/BLK WIRE REAR COMPARTMENT COURTESY LAMP REAR COMPARTMENT LID RELEASE ACTUATOR (IN LATCH ASSEMBLY) REAR COMPT AJAR RIGHT REAR DOOR AJAR SWITCH (SEDAN) (CENTER OF RIGHT "B" PILLAR BETWEEN HINGES) TAN WIRE TAN/WHT WIRE W/ ONSTAR W/O ONSTAR WHT WIRE

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) BPP SENS SIG BRAKE PEDAL POSITION SENSOR BRN WIRE BRN/WHT WIRE CENTER HIGH MOUNTED STOP LAMP (CHMSL) CHMSL FUSE CHMSL RELAY CHMSL SPLY VOLT COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DRL AMBIENT LIGHT SENS LOW REF DRL AMBIENT LIGHT SENS SIG GROUND GRY WIRE HAZARD SW SIG HAZARD SWITCH HEAD OFF HEADLAMP SWITCH HIGH SPEED GMLAN SERIAL DATA BUS + HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER (IPC) LEFT FRONT MARKER LAMP LEFT PARK/TURN SIGNAL LAMP LEFT TURN SIG LAMP LEFT TURN SIG SW SIG LEFT TURN SIGNAL IND LOGIC LOW REF LOW SPEED GMLAN SERIAL DATA LT BLU WIRE LT GRN/BLK WIRE PARK AUTO PARK LAMP RLY CTRL PARK LAMP SPLY VOLT LEFT REAR STOP/TURN PARK LAMP SW SIG PRK LAMP FUSE PRK LAMP PCB RELAY RIGHT FRONT MARKER LAMP RIGHT LEFT RIGHT PARK/TURN SIGNAL LAMP RIGHT REAR STOP/TURN RIGHT TURN SIG LAMP RIGHT TURN SIG SW SIG RIGHT TURN SIGNAL IND TAN WIRE TAN/BLK WIRE TURN SIGNAL/ MULTI-FUNCTION SWITCH TURN SWITCH UNDERHOOD FUSE BLOCK (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) WHT WIRE YEL WIRE YEL/BLK WIRE

BATTERY BLK WIRE BODY CONTROL MODULE (BCM) CENTER HIGH MOUNTED STOP LAMP (CHMSL) DOME LAMP DRIVER DOOR JAMB SWITCH DRIVER DOOR LOCK SWITCH DRIVER DRIVER CUSHION BACK HEATED HEATED SEAT SEAT ELEMENT ELEMENT DRIVER WINDOW SWITCH FUEL PUMP, SENDER ASSEMBLY INSIDE SUNROOF REARVIEW SWITCH MIRROR LEFT BACKUP LAMP LEFT REAR MARKER LAMP LEFT TAIL/STOP, TURN SIGNAL LAMP OUTSIDE REARVIEW MIRROR SWITCH PASSENGER BACK HEATED SEAT ELEMENT PASSENGER CUSHION HEATED AUXILIARY SEAT POWER ELEMENT OUTLET PASSENGER DOOR LOCK SWITCH PASSENGER HEATED SEAT MODULE PASSENGER WINDOW SWITCH POWER STEERING CONTROL MODULE (PSCM) REAR COMPARTMENT LID RELEASE ACTUATOR REAR WINDOW DEFOGGER GRID RIGHT FRONT FOG LAMP RIGHT FRONT MARKER LAMP RIGHT HEADLAMP RIGHT PARK/TURN SIGNAL LAMP RIGHT RIGHT REAR BACKUP MARKER LAMP LAMP RIGHT TAIL/STOP, TURN SIGNAL LAMP SEDAN SEDAN, COUPE SUNROOF MOTOR UNDERHOOD CHMSL FUSE BLOCK RELAY (IN ENGINE COMPT, NEXT TO LEFT STRUT TOWER) W/ FRONT HEATED SEATS W/ POWER SLIDING SUNROOF GLASS W/ POWER WINDOWS, REMOTE OUTSIDE MIRRORS W/O POWER SLIDING SUNROOF GLASS W/O POWER WINDOWS, REMOTE OUTSIDE MIRRORS WHT 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