HVAC Control Module X3 (CJ2)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: HVAC Control Module X3 (CJ2) Connector End View

Courtesy of GENERAL MOTORS CORP.

Pin	Wire	Circuit	Function
1	0.35 TN	518	Lower Left Air Temperature Sensor Signal
2	0.35 YE/BK	713	Defrost/Heater Mode Valve Position Sensor Signal
3	0.35 PU	1838	Recirculation Door Position Signal
4	0.35 GY/BK	754	Blower Motor Speed Control
5-9	-	-	Not Used
10	0.35 GY	598	5-Volt Reference
11	0.35 TN	520	Lower Right Air Temperature Sensor Signal
12	0.35 L-BU	733	Air Temperature Door Position Signal
13	0.35 D-BU	1646	Auxiliary Air Temperature Door Position Signal (C69)
14	0.5 D-BU	204	A/C Low Pressure Sensor Signal (HP2)
14	0.35 WH	2622	Evaporator Temperature Signal (except HP2)
15	0.35 TN	2273	Mode Door Control
16	0.35 D-BU	1199	Air Temperature Door Control
17	0.35 D-GN	1614	Recirculation Door Control
18	0.35 WH/BK	1236	Auxiliary Air Temperature Door Control (C69)
19	0.5 TN	914	Low Reference (HP2)
20	0.35 YE	1791	Low Reference

Connector Part Information

Harness Type: Instrument Panel
OEM Connector: 13782500
Service Connector: 13578571
Description: 20-Way F USCAR 0.64 Series (GY)

Terminal Part Information

Terminated Lead: 13575550
Release Tool: J-38125-559
Diagnostic Test Probe: J-35616-16 (L-GN)
Terminal/Tray: 15445905/23
Core/Insulation Crimp: J/J