Defogger Inoperative - Rear Window
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Defogger Inoperative - Rear Window
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Defogger Schematics Connector End View Reference: Stationary Windows Connector End Views DEFINITION: The rear window defogger is completely inoperative. No part of the rear window is heated. |
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| 1 | Did you review the operation of the rear window defogger system and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Stationary Windows |
| 2 |
|
Go to Step 3 | Go to Step 5 |
| 3 | Connect a test lamp between the rear window defogger grid and a good ground. Does the test lamp illuminate? |
Go to Step 4 | Go to Step 9 |
| 4 | Connect a test lamp between the left side of the rear window defogger grid and the right side of the rear window defogger grid. Does the test lamp illuminate? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 11 |
| 5 |
|
Go to Step 6 | Go to Step 8 |
| 6 | Connect a test lamp between the ignition voltage circuit, terminal B, of the HVAC Control Assembly and a good ground. Does the test lamp illuminate? |
Go to Step 7 | Go to Step 13 |
| 7 | Connect a test lamp between the ignition circuit, terminal B, of the HVAC Control Assembly and the ground circuit, terminal H, of the HVAC Control Assembly. Does the test lamp illuminate? |
Go to Step 10 | Go to Step 14 |
| 8 | Test the battery positive voltage circuit of the HVAC Control Assembly for an open or short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 12 |
| 9 | Test the supply voltage circuit of the rear window defogger for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 10 |
| 10 | 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 16 | Go to Step 15 |
| 11 | Repair an open or a high resistance in the ground circuit of the rear window defogger. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 16 | - |
| 12 | Repair a short to ground in the supply voltage circuit of the rear window defogger. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 16 | - |
| 13 | Repair an open or a high resistance in the ignition voltage circuit of the HVAC Control Assembly. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 16 | - |
| 14 | Repair an open or a high resistance in the ground circuit of the HVAC Control Assembly. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 16 | - |
| 15 | Replace the HVAC Control Assembly. Refer to HVAC Control Assembly Replacement (Chevrolet)
or HVAC Control Assembly Replacement (Pontiac)
in HVAC Systems - Manual. Did you complete the replacement? |
Go to Step 16 | - |
| 16 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |