Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Defogger Schematics Connector End View Reference: Window Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 | Verify that the rear window defogger is always ON. Does the rear window defogger operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | With a scan tool, observe the Rear Defog Switch data parameter in the Body Control Module data list. Does the scan tool display Inactive? | Go to Step 4 | Go to Step 6 |
4 | Remove the rear defog relay. Refer to Relay Replacement . Did the rear window defog turn OFF? | Go to Step 5 | Go to Step 8 |
5 | Test for a voltage signal at the rear defog relay control circuit terminal for the rear defog relay in the underhood fuse block. Refer to Electrical Center Identification Views and Circuit Testing . Was a voltage signal present? | Go to Step 7 | Go to Step 10 |
6 | Test for a short to ground in the rear defogger switch signal circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct a condition? | Go to Step 12 | Go to Step 11 |
7 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct a condition? | Go to Step 12 | Go to Step 9 |
8 | Repair the short to voltage in the rear defog element supply voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 12 | -- |
9 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | -- |
10 | Replace the rear defog relay. Refer to Relay Replacement . Did you complete the repair? | Go to Step 12 | -- |
11 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 12 | -- |
12 |
Did you correct the condition? | System OK | Go to Step 3 |
