Cadillac CTS I (2002-2007) hvac control module (behind center of dash, below radio) Wiring diagrams

23 55 HI SPD GMLAN + HI SPD GMLAN - APPROXIMATELY AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE ELEC PRNDL FUSE ELECTRONIC PRNDL ENGINE CONTROL MODULE (ECM) (FRONT OF RIGHT VALVE COVER) GRY WIRE HOT WHEN MINI ACCESSORY RELAY ENERGIZED HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) INSTRUMENT PANEL CLUSTER LT GRN WIRE ORG/BLK WIRE P/N P/N SIG PPL PPL PPL 1807 1807 SERIAL DATA SERIAL DATA PPL PPL 4 6 PPL PPL 5 8 PPL PPL PPL 24 26 25 PPL SERIAL DATA PPL/WHT WIRE RADIO REAR INTEGRATION MODULE (UNDER PACKAGE SHELF TRIM PANEL) SERIAL DATA SERVICE TRANSMISSION TRANS HOT IDLE ENGINE SPLICE PACK TAN/WHT WIRE TRANSMISSION INTERNAL MODE SWITCH TRS SIG A TRS SIG B TRS SIG C TRS SIG P UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPT) WHT WIRE YEL WIRE

23 55 HI SPD GMLAN + HI SPD GMLAN - APPROXIMATELY AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE ELEC PRNDL FUSE ELECTRONIC PRNDL ENGINE CONTROL MODULE (ECM) (FRONT OF RIGHT VALVE COVER) GRY WIRE HOT WHEN MINI ACCESSORY RELAY ENERGIZED HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) INSTRUMENT PANEL CLUSTER LT GRN WIRE ORG/BLK WIRE P/N P/N SIG PPL PPL PPL 1807 1807 SERIAL DATA SERIAL DATA PPL PPL 4 6 PPL PPL 5 8 PPL PPL PPL 24 26 25 PPL SERIAL DATA PPL/WHT WIRE RADIO REAR INTEGRATION MODULE (UNDER PACKAGE SHELF TRIM PANEL) SERIAL DATA SERVICE TRANSMISSION TRANS HOT IDLE ENGINE SPLICE PACK TAN/WHT WIRE TRANSMISSION INTERNAL MODE SWITCH TRS SIG A TRS SIG B TRS SIG C TRS SIG P UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPT) WHT WIRE YEL WIRE

BLK WIRE BLK/WHT WIRE CLASS 2 SERIAL DATA DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DOOR OPEN ENGINE CONTROL MODULE (ECM) (3.6L (VIN 7): FRONT OF RIGHT VALVE COVER) FRONT PASSENGER DOOR LATCH ASSEMBLY FRONT PASSENGER DOOR MODULE (ON RIGHT FRONT DOOR, UNDER DOOR TRIM PANEL) GROUND HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) IGN INSTRUMENT PANEL CLUSTER (IPC) LOGIC LT GRN WIRE ORG/BLK WIRE POWERTRAIN CONTROL MODULE PPL PPL 5.7L 2.8L/3.6L PPL CLASS 2 SERIAL DATA PPL CLASS 2 SERIAL DATA DOOR OPEN SW SIG PPL PPL PPL PPL 1807 1807 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL 58 59 1807 1807 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL 8 11 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL PPL 1 2 3 4 5 6 7 PPL PPL PPL 6 1 2 PPL PPL PPL PPL 25 24 23 26 RADIO REAR COMPARTMENT LID RELEASE ACTUATOR (CENTER OF REAR COMPARTMENT LID) RIGHT REAR FUSE BLOCK SECURITY INDICATOR TAN/WHT WIRE TRUNK AJAR SWITCH SIGNAL TRUNK RELEASE MOTOR SUPPLY VOLTAGE

AMBIENT LIGHT SENSOR SIGNAL BATTERY BLK WIRE BLK/WHT WIRE BLOWER FUSE BLOWER RELAY BRN WIRE CCP FUSE CMP CLU RELAY COMP CLUTCH FUSE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR (B+) DOOR A PPL EVAPORATOR TEMPERATURE SENSOR (ON RIGHT SIDE OF EVAPORATOR CASE) GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) IGN 3 FUSE IGNITION 3 VOLTAGE INSIDE AIR TEMPERATURE SENSOR (BEHIND DASH, LEFT OF RADIO) JOINT CONNECTOR LEFT REAR FUSE BLOCK (BELOW LEFT REAR SEAT) LEFT SUNLOAD SENSOR SIGNAL LOW REFERENCE LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE PNK WIRE PPL PPL PPL RECIRCULATION ACTUATOR (ON HVAC MODULE, AIR INLET MOTOR LEFT OF BLOWER MOTOR) RED WIRE RED/WHT WIRE RIGHT SUNLOAD SENSOR SIGNAL RUN WIRE SOLID STATE SPLICE PACK SUNLOAD SENSOR (TOP CENTER OF I/P, ON DEFROST GRILL) TAN WIRE UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPARTMENT) VOLT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1807 1807 PPL PPL 22 23 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA 1807 1807 PPL PPL CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA 20 21 2500 2501 H SPEED GMLAN DATA BUS + H SPEED GMLAN DATA BUS - 24 PPL 26 PPL 25 PPL 3 2 5 1 6 4 PPL PPL PPL PPL PPL PPL 33 32 2501 2500 H SPEED GMLAN DATA BUS - H SPEED GMLAN DATA BUS + 5.7L A/T EXCEPT 5.7L AUDIO AMPLIFIER (LEFT SIDE OF TRUNK) BASE BLK WIRE BLK/WHT WIRE CLASS 2 SERIAL DATA LEFT HEADLAMP CLASS 2 SERIAL DATA RIGHT HEADLAMP DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) DIGITAL RADIO RECEIVER (LEFT SIDE OF REAR PACKAGE SHELF) DIM/ALDL FUSE DRIVER DOOR MODULE (ON LEFT DOOR, UNDER DOOR TRIM) DRIVER DOOR SWITCH ASSEMBLY (DDSA) DRIVER'S MEMORY SEAT MODULE (UNDER DRIVER'S SEAT) ELECTRONIC BRAKE CONTROL MODULE (EBCM) (AT RIGHT FRONT CORNER OF ENGINE COMPT) ENGINE CONTROL MODULE (ECM) (FRONT OF RIGHT VALVE COVER) EXCEPT 5.7L EXCEPT 5.7L PPL FRONT PASSENGER DOOR MODULE (ON RIGHT FRONT DOOR, UNDER DOOR TRIM PANEL) HOT AT ALL TIMES HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (UNDER CENTER CONSOLE) INSTRUMENT PANEL CLUSTER (IPC) LEFT REAR DOOR MODULE (UNDER DOOR TRIM PANEL) LT GRN WIRE LUXURY POWERTRAIN CONTROL MODULE PPL PPL CLASS 2 SERIAL DATA PPL PPL 1807 1807 11 8 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL 1807 1807 25 9 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL 1807 1807 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL 59 58 1807 1807 CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL CLASS 2 SERIAL DATA CLASS 2 SERIAL DATA PPL PPL PPL PPL PPL PPL PPL PPL RADIO RADIO ANTENNA MODULE (ABOVE HEADLINER, NEAR REAR WINDOW) REAR INTEGRATION MODULE (RIM) (UNDER PACKAGE SHELF TRIM PANEL) RED WIRE RED/WHT WIRE RIGHT REAR DOOR MODULE (ON RIGHT REAR DOOR, UNDER DOOR TRIM PANEL) THEFT DETERRENT CONTROL MODULE (AT TOP OF STEERING COLUMN) TRANSMISSION CONTROL MODULE (TCM) (AT RIGHT FRONT OF ENGINE COMPT) TV ANTENNA MODULE UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPT) W/ AUTOMATIC HEADLAMPS CONTROL LEVELING SYSTEM WHT WIRE WHT/BLK WIRE

24 4 20 MAIN RELAY CTRL HIGH SPEED FAN RELAY CTRL LOW SPEED FAN RELAY CTRL 2761 (OR 470) 410 42 80 74 LOW SPEED FAN RELAY CTRL LOW REFERENCE ECT SENSOR SIGNAL 5.7L 65 33 MAIN RELAY CTRL HIGH SPEED FAN RELAY CTRL 7 23 LOW REFERENCE ECT SENSOR SIGNAL BLK WIRE BLU WIRE BRN WIRE COMPUTER DATA LINES SYSTEM COOLANT LEVEL SWITCH (IN LEFT FRONT CORNER OF COOLANT SURGE TANK) DK BLU WIRE DK GRN WIRE ENGINE CONTROL MODULE (ECM) (FRONT OF RIGHT VALVE COVER) ENGINE COOLANT LOW LEVEL EXCEPT 5.7L GRY WIRE HI FAN FUSE HI SPEED FAN RELAY HOT AT ALL TIMES HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) LEFT COOLING FAN (LEFT SIDE OF RADIATOR) LO SPEED FAN RELAY LOGIC LOW FAN FUSE LT BLU WIRE LT GRN WIRE MAIN RELAY MESSAGE CENTER POWERTRAIN CONTROL MODULE (PCM) PPL PPL PPL SERIAL DATA SERIAL DATA COOLANT LEVEL SW RADIO RIGHT COOLING FAN (RIGHT SIDE OF RADIATOR) S/P FAN RELAY SERIAL DATA TAN WIRE UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE COMPARTMENT) WHT WIRE YEL WIRE

193 1807 COMPUTER DATA LINES SYSTEM PPL 4 8 628 607 LOW REFERENCE SUPPLY VOLTAGE 627 606 4 8 LOW REFERENCE SUPPLY VOLTAGE BLK WIRE CLASS 2 SERIAL DATA COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEM PPL CLASS 2 SERIAL DATA DRIVER DOOR MODULE (ON LEFT DOOR, UNDER DOOR TRIM) DRIVER OUTSIDE REARVIEW MIRROR FEED HEATED MIRROR ELEMENT FRONT PASSENGER DOOR MODULE (ON RIGHT FRONT DOOR, UNDER DOOR TRIM PANEL) GRY WIRE HOT AT ALL TIMES HOT IN RUN HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) NCA WIRE ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR FEED PPL REAR DEFOG FUSE REAR DEFOG RELAY REAR DEFOGGER INDICATOR REAR DEFOGGER SWITCH LOGIC REAR INTEGRATION MODULE (UNDER PACKAGE SHELF TRIM PANEL) REAR WINDOW DEFOGGER GRID (ON REAR WINDOW GLASS) RELAY CONTROL CLASS 2 SERIAL DATA RIGHT REAR FUSE BLOCK (BELOW RIGHT REAR SEAT) RTN RTN HEATED MIRROR ELEMENT WHT WIRE

6 SPD M/T OTHERS BLK WIRE BRN WIRE BRN/WHT WIRE CLASS 2 (DIM) CLASS 2 SERIAL DATA COMPARTMENT) COMPUTER DATA LINES SYSTEM DK GRN WIRE DK GRN/WHT WIRE FLASH TO PASS SWITCH SIGNAL FOG LAMP FUSE FOG LAMP RELAY FOG LAMP RLY CTRL LO BEAM RLY CONTROL HI BEAM RLY CTRL COIL SPLY VOLT CTRL FRONT FOG LAMP IND FRONT FOG LAMP SWITCH GRY WIRE HEADLAMP RELAY CONTROL HI LOW HIGH BEAM IND HOT AT ALL TIMES HOT IN RUN OR START HVAC CONTROL MODULE (BEHIND CENTER OF DASH, BELOW RADIO) INSTRUMENT PANEL CLUSTER (IPC) LEFT FRONT FOG LAMP LEFT FRONT TURN SIGNAL/ FOG LAMP ASSEMBLY LOGIC LT BLU WIRE LT BLU/BLK WIRE M/T NCA WIRE ORG/ WIRE OTHERS 6 SPD M/T PARK HEAD HEAD OFF AUTO AUTO PARK OFF PNK WIRE PNK/WHT WIRE PPL PPL PPL RIGHT FRONT FOG LAMP RIGHT FRONT TURN SIGNAL/ FOG LAMP ASSEMBLY SUNLOAD SENSOR (TOP CENTER OF I/P, ON DEFROST GRILL) TAN WIRE TAN/WHT WIRE TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD FUSE BLOCK (RIGHT FRONT OF ENGINE WHT WIRE YEL WIRE