Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Exchange the rear defogger relay with a known good relay from the underhood junction block. Does the rear defogger grid continue to warm? | -- | Go to Step 2 | Go to Step 3 |
2 | Disconnect the underhood junction block connector C3. Does the rear defogger grid continue to warm? | -- | Go to Step 4 | Go to Step 9 |
3 | Replace the faulty relay Is the repair complete? | -- | Go to Defogger System Check | -- |
4 |
Does the test lamp light? | -- | Go to Step 5 | Go to Step 6 |
5 | Repair the short to positive battery voltage in CKT 293 between the underhood junction block and the left IP junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
6 |
Does the test lamp light? | -- | Go to Step 7 | Go to Step 8 |
7 | Repair the short to positive battery voltage in CKT 293 between the left IP junction block and the rear defogger grid. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
8 | Replace the left IP junction block. Is the repair complete? | -- | Go to Defogger System Check | -- |
9 |
Is the resistance measured within the specified range? | Infinite | Go to Step 10 | Go to Step 11 |
10 | Replace the underhood junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | Go to Defogger System Check | -- |
11 |
Is the resistance measured within the specified range? | Infinite | Go to Step 12 | Go to Step 13 |
12 | Replace the heater and A/C control assembly. Refer to Control Assembly Replacement in HVAC Systems with A/C-Manual. Is the repair complete? | -- | Go to Defogger System Check | -- |
13 | Repair the short to ground in CKT 193 between the heater and A/C control assembly and the underhood junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
