Step | Action | 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 indicator illuminate? | Go to Step 3 | Go to Step 5 |
3 | Connect a test lamp between the left side of the rear defogger grid and the right side of the rear defogger grid. Does the test lamp illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 | Connect a test lamp between the rear defogger grid and a good ground. Does the test lamp illuminate? | Go to Step 9 | Go to Step 7 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 10 |
6 | Connect a test lamp between the ground circuit of the heater - A/C and rear defogger control assembly for the rear defogger indicator and the battery positive voltage circuit of the heater - A/C and rear defogger control assembly and a good ground. Does the test lamp illuminate? | Go to Step 8 | Go to Step 11 |
7 | Test the rear defogger supply voltage circuit 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 13 | Go to Step 8 |
8 | Inspect for a poor connection at the harness connector of the heater-A/C and rear defogger 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 13 | Go to Step 12 |
9 | Repair an open or high resistance in the ground circuit of the rear defogger. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
10 | Repair an open or high resistance in the battery positive voltage circuit of the heater-A/C and rear defogger control assembly. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Repair an open or high resistance in the ground circuit of the heater-A/C and rear defogger control assembly. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
12 | Replace the Heater-A/C and Rear Defogger Control Assembly. Refer to HVAC Module Assembly Replacement in Heating, Ventilation and Air Conditioning. Did you complete the repair? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
