Contents Wiring diagrams Section: Automatic HVAC System All sections

HVAC Systems - Automatic: Wiring GMC Sierra 3500

HVAC Connector End Views

A/C Compressor Clutch Connector End Connector Part Information 12162017 2-Way F Metri-Pack 150 Series (GRY) Pin Wire Color Circuit No. Function A BLK 550 Ground B DK GRN 59 A/C Compressor Clutch Supply Voltage

A/C Low Pressure Switch Connector End Connector Part Information 12052644 2-Way F Metri-Pack 150 Series (LT GRY) Pin Wire Color Circuit No. Function A DK BLU 204 A/C Low Pressure Sensor Signal B BLK 550 Ground

A/C Refrigerant Pressure Sensor Connector End Connector Part Information 15344137 3-Way F GT 150 Sealed (BLK) Pin Wire Color Circuit No. Function 1 BLK 2751 Low Reference 2 GRY 2700 5-Volt Reference 3 RED/BLK 380 A/C Refrigerant Pressure Sensor Signal

Air Temperature Actuator - Left, Connector End Connector Part Information 12064993 6-Way F Micro-Pack 100 Series (BLK) Pin Wire Color Circuit No. Function 5 BRN 341 Ignition 3 Voltage 6 DK BLU 1199 Auxiliary Air Temperature Door Control 7 YEL 1791 Low Reference 8 - - Not Used 9 LT BLU 733 Left Air Temperature Door Position Signal 10 LT BLU/BLK 1688 5-Volt Reference

Air Temperature Actuator - Right, Connector End Connector Part Information 12064993 6-Way F Micro-Pack 100 Series (BLK) Pin Wire Color Circuit No. Function 5 BRN 341 Ignition 3 Voltage 6 WHT/BLK 1236 Right Air Temperature Door Control 7 YEL 1791 Low Reference 8 - - Not Used 9 DK BLU 1646 Right Air Temperature Door Position Signal 10 LT BLU/BLK 1688 5-Volt Reference

Ambient Air Temperature Sensor Connector End Connector Part Information 12052641 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A LT GRN/BLK 735 Ambient Air Temperature Sensor Signal B BRN 718 Low Reference

Air Temperature Sensor - Upper Left Connector End Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BRN 718 Low Reference B WHT 2338 Upper Left Air Temperature Sensor Signal

Air Temperature Sensor - Upper Right Connector End Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BRN 718 Low Reference B GRY 2336 Upper Right Air Temperature Sensor Signal

Air Temperature Sensor - Lower Left Connector End Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BRN 718 Low Reference B WHT/BLK 2339 Lower Left Air Temperature Sensor Signal

Air Temperature Sensor - Lower Right Connector End Connector Part Information 12047662 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A BRN 718 Low Reference B GRY/BLK 2337 Lower Right Air Temperature Sensor Signal

Blower Motor Connector End Connector Part Information 12064749 2-Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function A PPL - Blower Motor Supply Voltage B BLK - Ground

Blower Motor Control Processor Connector End Connector Part Information 12129489 3-Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function A RED 542 Battery Positive Voltage B PPL/WHT 760 Blower Motor Speed Control C BLK 1050 Ground

HVAC Control Module - C1 Connector End Connector Part Information 12110206 24-Way F Micro-Pack 100 Series (LT BLU) Pin Wire Color Circuit No. Function A1 DK GRN 1614 Recirculation Door Control A2 DK BLU 1646 Right Air Temperature Door Position Signal A3 LT BLU 733 Left Air Temperature Door Position Signal A4 - - Not Used A5 LT GRN 2275 Mode Door Position Signal A6 - - Not Used A7 BRN/WHT 230 Instrument Panel Lamps Dimming Control A8 BLK/WHT 1851 Ground A9 - A11 - - Not Used A12 DK BLU 204 A/C Low Pressure Sensor Signal B1 WHT/BLK 1236 Right Air Temperature Door Control B2 DK BLU 1199 Left Air Temperature Door Control B3 - - Not Used B4 TAN 2273 Mode Door Control B5 BRN 341 Ignition 3 Voltage B6 YEL 1791 Low Reference B7 ORN 4340 Battery Positive Voltage B8 LT BLU/ BLK 1688 5-Volt Reference B9 BLK 1050 Ground B10 - - Not Used B11 WHT 1038 HVAC Class 2 Serial Data B12 - - Not Used

HVAC Control Module - C2 Connector End Connector Part Information 15336594 12-Way F Micro Pack 100 (GRY) Pin Wire Color Circuit Number Function A DK GRN 734 Inside Air Temperature Sensor Signal B LT GRN/ BLK 735 Ambient Air Temperature Sensor Signal C WHT 2338 Upper Left Air Temperature Sensor Signal D GRY 2336 Upper Right Air Temperature Sensor Signal E WHT/BLK 2339 Lower Left Air Temperature Sensor Signal F GRY/BLK 2337 Lower Right Air Temperature Sensor Signal G PPL 1838 Recirculation Door Position Signal H - J - - Not Used K BRN 718 Low Reference L WHT/BLK 5515 Inside Air Temperature Sensor Assembly Control M PPL/WHT 760 Blower Motor Speed Control

Inside Air Temperature Sensor Assembly Connector End Connector Part Information 12045813 4-Way F Metri-Pack 150 (NAT) Pin Wire Color Circuit No. Function A DK GRN 734 Inside Air Temperature Sensor Signal B WHT/BLK 5515 Inside Air Temperature Sensor Assembly Control C BLK 1050 Ground D BRN 718 Low Reference

Mode Actuator Connector End Connector Part Information 12064993 6-Way F Micro-Pack 100 Series (BLK) Pin Wire Color Circuit No. Function 5 BRN 341 Ignition 3 Voltage 6 TAN 2273 Mode Door Control 7 YEL 1791 Ground 8 - - Not Used 9 LT GRN 2275 Mode Door Position Signal 10 LT BLU/ BLK 1688 5-Volt Reference

Recirculation Actuator Connector End Connector Part Information 12064993 6-Way F Micro-Pack 100 Series (BLK) Pin Wire Color Circuit No. Function 5 BRN 341 Ignition 3 Voltage 6 DK GRN 1614 Recirculation Door Control 7 YEL 1791 Ground 8 - - Not Used 9 PPL 1838 Recirculation Door Position Signal 10 LT BLU/ BLK 1688 5-Volt Reference

Sunload Sensor Connector End Connector Part Information 12064760 4-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A LT BLU/BLK 590 Driver Sunload Sensor Signal B GRY 1548 Passenger Sunload Sensor Signal C BLK 279 Ambient Light Sensor Low Reference D WHT 278 Ambient Light Sensor Signal