Cadillac STS I (2004-2007) 2 1 serial data serial data Wiring diagrams

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