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HOMESERVICE MANUALSCHEVROLET2001CAVALIER LS, 2.4 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 296 (STATIONARY WINDOW SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDEFOGGER INDICATOR ALWAYS ON
2001 Chevrolet Cavalier LS, 2.4 T

Defogger Indicator Always On

2001 Chevrolet Cavalier LS, 2.4 TSECTION Defogger Indicator Always On
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Defogger Indicator Always On

Step Action Yes No
Schematic Reference: Defogger Schematics 
Connector End View Reference: Stationary Windows Connector End Views 
1 Did you perform the Defogger Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Defogger 
2
  1. Start the engine.
  2. Command the rear window defogger indicator ON and OFF, by depressing the rear window defogger switch.
  3. Observe the rear window defogger indicator on the HVAC Control Module.
Does the rear window defogger indicator turn ON and OFF with each command?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the harness connector C2 of the Body Control Module (BCM).
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between battery positive voltage and the secondary rear defogger switch signal circuit of the HVAC Control Module.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 5 
4 Test the secondary rear defogger switch signal circuit of the HVAC Control Module for short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for poor connections at the harness connector of the BCM. 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 9  Go to Step 7 
6 Inspect for poor connections at the harness connector of the HVAC Control Module. 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 9  Go to Step 8 
7
IMPORTANT: Perform the set up procedure for the BCM.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 9  -
8 Replace the HVAC Control Module. Refer to HVAC Control Module Replacement in HVAC Systems - Manual.
Did you complete the replacement?		 Go to Step 9  -
9 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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When to See a Mechanic

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.