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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSSTATIONARY WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDEFOGGER INDICATOR ALWAYS ON
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Defogger Indicator Always On

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Defogger Indicator Always On
Defogger Indicator Always On

Step Action Yes No
Schematic Reference: Defogger Schematics 
Connector End View Reference: Stationary Windows Connector End Views 
1 Did you review the Rear Window Defogger system operation and perform the necessary inspections? Go to Step 2  Go to Symptoms - Stationary Windows 
2
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the rear window defogger indicator on the HVAC control assembly.
  3. Command the rear window defogger indicator ON and OFF, by depressing the rear window defogger switch on the HVAC control assembly.
Does the indicator remain illuminated?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3
  1. Turn OFF the ignition.
  2. Disconnect the harness connector C1 of the HVAC control assembly.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the supply voltage circuit terminal D of the rear window defogger and a good ground.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 4 
4 Inspect for poor connections at the harness connector of the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 7  Go to Step 6 
5 Repair a short to voltage in the supply voltage circuit of the rear window defogger grid. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 7  -
6 Replace the HVAC control assembly. Refer to HVAC Control Assembly Replacement in HVAC Systems - Manual.
Did you complete the replacement?		 Go to Step 7  -
7 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
RENDER: 1.0x

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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.