Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the rear window defogger operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the rear defogger relay turn ON and OFF with each command? | -- | Go to Step 8 | Go to Step 3 |
3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Step 16 |
4 |
Does the test lamp turn ON and OFF with each command? | -- | Go to Step 14 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each command? | -- | Go to Step 7 | Go to Step 6 |
6 | Test the control circuit of the rear defogger relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 15 |
7 | Test the control circuit of the rear defogger relay for a short to ground. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 15 |
8 | Test the rear defogger fuse. Is the fuse open? | -- | Go to Step 17 | Go to Step 9 |
9 |
Does the test lamp illuminate with each command? | -- | Go to Step 10 | Go to Step 11 |
10 |
Is the resistance within the specified value? | 1-3 ohms | Go to Step 18 | Go to Step 19 |
11 |
Does the test lamp illuminate with each command? | -- | Go to Step 12 | Go to Step 17 |
12 | Test the rear defogger battery positive voltage input circuit between the defogger grid and the heated backlight antenna module for an open circuit. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 21 |
13 | Inspect for poor connections at the heated backlight antenna 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 23 | Go to Step 21 |
14 | Inspect for poor connections at the rear defogger relay. 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 23 | Go to Step 20 |
15 | Inspect for poor connections at the harness connector of the body control module (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 23 | Go to Step 22 |
16 | Repair the coil side feed circuit of the rear defogger relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 23 | -- |
17 | Repair the rear defogger grid input circuit and replace the fuse. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | -- |
18 | Repair open rear defogger grid. Refer to Defogger Grid Lines Diagnosis . Did you find and correct the condition? | -- | Go to Step 23 | -- |
19 | Repair open rear defogger grid ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | -- |
20 | Replace the rear defogger relay. Did you complete the replacement? | -- | Go to Step 23 | -- |
21 | Replace the heated backlight antenna module. Did you complete the repair? | -- | Go to Step 23 | -- |
22 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 23 | -- |
23 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
