Cadillac STS I (2004-2007) (on right front frame rail, near bumper bracket) Wiring diagrams

1 2 3 4 5 6 LOW REF AIR QUAL HC SENS IGN 1 VOLTAGE AIR QUAL NOX SENS A/C COMPRESSOR CLUTCH A/C DEF AIR QUALITY SENSOR (IF EQUIPPED) (UNDER FRONT FACIA, NEAR CENTER OF GRILLE) BLK WIRE BLOWER CONTROLLER (IN PASS COMPT, UNDER DASH, BEHIND GLOVE BOX) BLOWER MOTOR (UNDER DASH, BEHIND GLOVE BOX) BLOWER MTR FAN CONTROL BLOWER MTR RESISTOR ASSY SUPPLY VOLTAGE BLOWER MTR SPEED CTRL BLU WIRE BRN WIRE COLD DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DRIVER AIR TEMPERATURE ACTUATOR (ON LEFT SIDE OF HVAC MODULE) DRY AIR TEMP SIGNAL FRONT PASSENGER AIR TEMPERATURE ACTUATOR (ON RIGHT SIDE OF HVAC MODULE) GROUND GRY WIRE GRY/BLK WIRE HOT HOT W/ IGN 1 RELAY ENERGIZED IGN 1 FUSE LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MODE ACTUATOR (ON TOP LEFT SIDE OF HVAC MODULE) MODE VALVE SIGNAL PASS AIR TEMP SIGNAL PNK 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 WIRE PNK WIRE POWER SEAT SYSTEM (HEATED SEAT CIRCUIT) PPL PPL/WHT WIRE RIGHT REAR FUSE BLOCK (UNDER RIGHT SIDE OF REAR SEAT) SPLICE PACK TAN WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

2 1 SERIAL DATA SERIAL DATA 2501 2500 COMPUTER DATA LINES SYSTEM 3.6L 3.6L 4.6L 32 11 25 35 43 42 55 LOW REFERENCE A/C REFRIG PRESS SENSOR A/C CLUTCH RELAY CTRL 38 54 LOW REFERENCE ECT SENSOR SIGNAL 4.6L (3.6L) (IN ENGINE HARNESS, 28 CM FROM MAF SENSOR CONNECTOR) 7 23 55 LOW REFERENCE ECT SENSOR SIGNAL SERIAL DATA A/C REFRIGERANT PRESSURE SENSOR (NEAR THE LEFT FRONT STRUT TOWER) AFTER BOIL FUSE AFTER BOIL HEATER PUMP (4.6L) AFTER BOIL RELAY (4.6L) AMBIENT AIR TEMPERATURE SENSOR (UNDER FRONT FACIA, NEAR CENTER OF GRILLE) BLK WIRE BLK/WHT WIRE BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT LEVEL SWITCH (IN BOTTOM OF COOLANT RESERVOIR) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE CONTROL MODULE (ECM) (FRONT OF ENGINE, ON RIGHT VALVE COVER) ENGINE CONTROLS SYSTEM ENGINE COOLANT HOT ENGINE COOLANT LOW LEVEL FEED GRY WIRE HI SPEED FAN RELAY HIGH FAN FUSE HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER LEFT COOLING FAN (BEHIND RADIATOR) LO SPEED FAN RELAY LOGIC LOW FAN FUSE LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE MAIN RELAY MAIN RELAY CTRL HI SPEED FAN RELAY CTRL LOW SPEED FAN RELAY CTRL MESSAGE CENTER ORG/ WIRE ORG/BLK (OR RED/BLK) WIRE ORG/BLK WIRE PNK WIRE RADIO RED WIRE RED/BLK WIRE RIGHT COOLING FAN (BEHIND RADIATOR) RIGHT REAR FUSE BLOCK (UNDER RIGHT SIDE OF REAR SEAT) RTN S/P FAN RELAY S107 (3.6L) (IN ENGINE HARN, 36 CM FROM BRAKE PRESSURE SENSOR CONNECTOR) SERIAL DATA SIG SPLICE PACK TAN (OR BLK/WHT) WIRE TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (RIGHT FRONT SIDE OF ENGINE COMPARTMENT) WHT WIRE YEL WIRE

2 1 SERIAL DATA SERIAL DATA 2501 2500 COMPUTER DATA LINES SYSTEM 3.6L 3.6L 4.6L 38 54 LOW REFERENCE ECT SENSOR SIGNAL 4.6L 43 42 55 MAIN RELAY CTRL HI SPEED FAN RELAY CTRL LOW SPEED FAN RELAY CTRL 7 23 55 LOW REFERENCE ECT SENSOR SIGNAL SERIAL DATA AFTER BOIL COOLANT PMP REL AFTER BOIL FUSE AFTER BOIL HEATER PUMP (4.6L) AFTER BOIL RELAY (4.6L) BLK WIRE BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT LEVEL SWITCH (IN BOTTOM OF COOLANT RESERVOIR) COOLANT LEVEL SWITCH SIGNAL LOW SPD GM/LAN SERIAL DATA DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (FRONT OF ENGINE, ON RIGHT VALVE COVER) ENGINE COOLANT HOT ENGINE COOLANT LOW LEVEL GRY WIRE HI SPEED FAN RELAY HIGH FAN FUSE HOT AT ALL TIMES HVAC CONTROL MODULE (IN CENTER OF DASH, BELOW RADIO) INSTRUMENT PANEL CLUSTER LEFT COOLING FAN (BEHIND RADIATOR) LO SPEED FAN RELAY LOGIC LOW FAN FUSE LT BLU WIRE LT GRN WIRE MAIN RELAY MESSAGE CENTER PNK WIRE RADIO RIGHT COOLING FAN (BEHIND RADIATOR) RIGHT REAR FUSE BLOCK (UNDER RIGHT SIDE OF REAR SEAT) S/P FAN RELAY SERIAL DATA SPLICE PACK TAN WIRE TAN/BLK WIRE UNDERHOOD FUSE BLOCK (RIGHT FRONT SIDE OF ENGINE COMPARTMENT) WHT WIRE YEL WIRE

A/T SHIFT LEVER ASSEMBLY ACCESSORY RELAY AIR QUALITY SENSOR BLK WIRE BLK/WHT WIRE BLOWER CONTROLLER CONSOLE AUXILIARY POWER OUTLET DISTANCE SENSING CRUISE CONTROL MODULE FRONT AUXILIARY POWER OUTLET FRONT PASSENGER DOOR MODULE FRONT PASSENGER WINDOW MOTOR FRONT PASSENGER WINDOW SWITCH HAZARD SWITCH HOOD AJAR SWITCH HORN ASSEMBLY I/P COMPARTMENT LAMP SWITCH HVAC CONTROL MODULE IGN 1 RELAY IGNITION MODE SWITCH INSTRUMENT PANEL MODULE (IPM) LEFT FRONT CORNERING/ SIDE MARKER LAMP LEFT FRONT TURN SIGNAL/ FOG LAMP ASSEMBLY LEFT HEADLAMP LEFT REPEATER LAMP NCA WIRE PASSENGER DOOR LATCH ASSEMBLY PASSENGER DOOR LOCK SWITCH REAR AUXILIARY HVAC CONTROL MODULE REAR AUXILIARY POWER OUTLET RIGHT COOLING FAN RIGHT FRONT CORNERING/ SIDE MARKER LAMP RIGHT FRONT DOOR HANDLE SWITCH RIGHT FRONT TURN SIGNAL/ FOG LAMP ASSEMBLY RIGHT HEADLAMP RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH RIGHT REAR DOOR MODULE (RRDM) RIGHT REAR WINDOW MOTOR RIGHT REPEATER LAMP S/P FAN RELAY TRACTION CONTROL SWITCH W/ HID RIGHT HEADLAMP W/O HID WHT WIRE

A/C COMPRESSOR CLUTCH RELAY ACCESSORY RELAY BLK WIRE BRN WIRE CCP FUSE COMP CLUTCH FUSE DISTANCE SENSING CRUISE CONTROL MODULE (W/ AUTO ADAPTIVE CRUISE CONTROL) FOG LAMP FUSE FOG LAMP RELAY FROM INSTRUMENT PANEL MODULE (DIAGRAM 4 OF 7) FROM UNDERHOOD FUSE BLOCK (MAIN RELAY) (DIAGRAM 1 OF 7) HDLP WASHER CIRCUIT BREAKER HEAD UP DISPLAY (HUD) HEADLAMP LEVELING MODULE HEADLAMP WASHER FLUID PUMP FLUID HEADLAMP WASHER FLUID PUMP RELAY HIGH BEAM RELAY HORN FUSE HORN RELAY HUD FUSE HVAC CONTROL MODULE L REAR FUSE LOW BEAM RELAY PARK LAMP RELAY R REAR FUSE RAIN SENSOR HDLP FUSE RED WIRE SPARE FUSE SPARE RELAY TILT/ TELESCOPE SWITCH TILT/LK LMP/CLM RELAY COILS FUSE TO LEFT REAR FUSE BLOCK (ALC RELAY TO LEFT REAR FUSE BLOCK (DRIVER DOOR MODULE TO RIGHT REAR FUSE BLOCK (IGN 1 RELAY) (DIAGRAM 7 OF 7) TO RIGHT REAR FUSE BLOCK (POWER WINDOWS MOTOR CIRCUIT W/ HID HEADLAMPS WHT WIRE WINDSHIELD WIPER/ WASHER MODULE WPR MOD FUSE WPR SW VICS FUSE SPARE FUSE YEL WIRE

3.6L 4.6L A/C COMP CLUTCH RELAY AUXILIARY POWER OUTLET BANK 1 SENSOR 2 BANK 1 SENSOR 2 CONN) (4.6L: ENGINE HARN, BANK 2 SENSOR 2 BLK WIRE ENGINE CONTROL MODULE (ECM) EVEN INJ/ COILS FUSE FOG LAMP RELAY FROM RIGHT REAR FUSE BLOCK (IGNITION 1 FROM UNDERHOOD FUSE BLOCK FRONT AUXILIARY POWER OUTLET FUEL INJECTOR 2 (4.6L) FUEL INJECTOR 4 (4.6L) FUEL INJECTOR 4 FUEL INJECTOR 2 FUEL INJECTOR 6 FUEL INJECTOR 6 (4.6L) FUEL INJECTOR 8 (4.6L) HEATED OXYGEN SENSOR I/P OUTLET FUSE SPARE FUSE IGN 1 RELAY IGNITION COIL 2 IGNITION COIL 4 IGNITION COIL 6 IGNITION COIL/ MODULE 2 IGNITION COIL/ MODULE 4 IGNITION COIL/ MODULE 6 IGNITION COIL/ MODULE 8 INSTRUMENT PANEL CLUSTER (IPC) PNK PNK PNK WIRE PNK PNK WIRE PNK WIRE POST 02 FUSE REAR AUXILIARY POWER OUTLET RED WIRE SPARE FUSE OUTLET FUSE STARTER FUSE STARTER RELAY TCM/IPC/ ECM FUSE TO UNDERHOOD FUSE BLOCK (WASH NOZ/AQS TRANSMISSION CONTROL MODULE (TCM) (3.6L) UNDERHOOD FUSE BLOCK (RIGHT FRONT SIDE OF ENGINE COMPT) WHT WIRE

11 20 24 WIPER SW SIGNAL 2 WIPER SW ON SIGNAL HDLP RELAY CONTROL ACCESSORY RELAY BLK WIRE DELAY DK BLU WIRE GRY WIRE HI LO HI LO INT HOT AT ALL TIMES HOT IN ACC OR RUN HOT IN RUN OR START IGN 1 RELAY INSTRUMENT PANEL MODULE (RIGHT SIDE OF DASH BEHIND GLOVE BOX) LEFT HEATED WASHER NOZZLE LT GRN WIRE MIST MIST OFF OFF OFF INT ORG/ WIRE PNK WIRE PPL RIGHT HEATED WASHER NOZZLE TAN WIRE TAN/WHT WIRE UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPT) WASH WASH NOZ/ACC FUSE WASHER FLUID LEVEL SIG WHT WIRE WINDSHIELD WIPER/ WASHER MODULE (LEFT REAR OF ENGINE COMPT, NEAR WINDSHIELD) WINDSHIELD WIPER/WASHER SWITCH WIPER SWITCH WPR MOD FUSE WPR SW/ VICS FUSE YEL WIRE