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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 686 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - F THROUGH H)COMPONENT CONNECTOR END VIEWS - F THROUGH HHVAC CONTROL MODULE X1
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

HVAC Control Module X1

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION HVAC Control Module X1
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: HVAC Control Module X1
GM1664585Courtesy of GENERAL MOTORS CORP.
HVAC Control Module X1

Pin Wire Circuit Function
1 0.35 GY 705 5-Volt Reference
2-3 - - Not Used
4 0.35 D-GN 5060 Low Speed GMLAN Serial Data
5 - - Not Used
6 0.35 BN 247 Medium Blower Motor Control
7-8 - - Not Used
9 0.35 RD/WH 340 Battery Positive Voltage
10 0.35 YE 61 Low Reference
11 0.35 BK/WH 451 Ground
12-15 - - Not Used
16 0.5 GY/BK 754 Blower Motor Speed Control
17 - - Not Used
18 0.35 PK 1539 Run/Crank Ignition 1 Voltage
Connector Part Information 
  • Harness: Instrument Panel
  • OEM: 7283-4544-30
  • Service: 89047360
  • Description: 18-Way F 0.64 Kaizen Series (BK)
Terminal Part Information 
  • Terminal/Tray: SAIT-A03T-M064/14
  • Core/Insulation Crimp: P/P
  • Release Tool/Test Probe: J-38125-215A/J-35616-64B (L-BU)
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.