Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does either zone indicate ON? | -- | Go to Step 2 | Go to Step 3 |
2 |
Does the scan tool indicate rear defog zone 1 or 2 on? | -- | Go to Step 6 | Go to Step 10 |
3 |
Does the test lamp light? | -- | Go to Step 4 | Go to Step 7 |
4 |
Does the test lamp light? | -- | Go to Step 5 | Go to Step 6 |
5 | Repair the short to ground in CKT 1777 (RED) or CKT 193 (WHT). Refer to Wiring Repairs in Wiring Systems. Has the repair been made? | -- | Go to Defogger System Check | -- |
6 | Replace the HVAC programmer. Refer to Programmer Replacement in HVAC Systems with A/C - Automatic. Has the repair been made? | -- | Go to Defogger System Check | -- |
7 |
Does the test lamp light? | -- | Go to Step 8 | Go to Step 9 |
8 | Repair a short to voltage in CKT 293 (PPL) relay 2. Refer to Wiring Repairs in Wiring Systems. Has the repair been made? | -- | Go to Defogger System Check | -- |
9 | Replace the suspect relay. Has the repair been made? | -- | Go to Defogger System Check | -- |
10 | Replace the HVAC control assembly. Refer to Control Assembly Replacement in HVAC Systems with A/C - Automatic. Has the repair been made? | -- | Go to Defogger System Check | -- |
