Defogger Inoperative
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the defogger ON indicator come on? | -- | Go to Step 2 | Go to Step 15 |
2 |
Does the test lamp light? | -- | Go to Step 3 | Go to Step 8 |
3 | Using a test lamp, backprobe the rear window defogger relay harness connector between terminals B7 and ground. Does the test lamp light? | -- | Go to Step 4 | Go to Step 7 |
4 |
Does the test lamp light? | -- | Go to Step 23 | Go to Step 6 |
5 | Replace the heater-A/C control. Refer to Control Assembly Replacement in HVAC Sysems - Manual. Is the repair complete? | -- | Go to Defogger System Check | -- |
6 | Repair a poor connection or an open in CKT 193. Is the repair complete? | -- | Go to Defogger System Check | -- |
7 | Repair a poor connection or an open in CKT 241 between the rear window defogger relay harness connector terminal B7 and S264. Is the repair complete? | -- | Go to Defogger System Check | -- |
8 | Using a test lamp, probe the rear window defogger relay harness connector between terminal C7 and ground. Does the test lamp light? | -- | Go to Step 9 | Go to Step 25 |
9 |
Does the test lamp light? | -- | Go to Step 10 | Go to Step 11 |
10 | Repair the rear defogger grid. Refer to Grid Line Repair . Is the repair complete? | -- | Go to Defogger System Check | -- |
11 |
Does the test lamp light? | -- | Go to Step 12 | Go to Step 13 |
12 | Repair a poor connection or an open in CKT 450 between the rear defogger grid connector C1 and G401. Is the repair complete? | -- | Go to Defogger System Check | -- |
13 | Repair a poor connection or an open in CKT 293 between the rear window defogger relay connector terminal B5 and the rear defogger grid connector C2. Is the repair complete? | -- | Go to Defogger System Check | -- |
14 | Repair a poor connection or an open in CKT 1040 between the fuse block terminal H6 and the rear window defogger relay harness connector terminal C7. Is the repair complete? | -- | Go to Defogger System Check | -- |
15 | Test to see if the HVAC/DRL Fuse in the fuse block is open. Is the HVAC/DRL Fuse in the fuse block open? | -- | Go to Step 16 | Go to Step 17 |
16 | Repair the short to ground in CKT 241. Is the repair complete? | -- | Go to Defogger System Check | -- |
17 |
Does the test lamp light? | -- | Go to Step 18 | Go to Step 20 |
18 |
Does the test lamp light? | -- | Go to Step 19 | Go to Step 5 |
19 | Repair a short to B+ in CKT 193. Is the repair complete? | -- | Go to Defogger System Check | -- |
20 | Using a test lamp, backprobe between the heater-A/C control harness connector C2 terminal C and ground. Does the test lamp light? | -- | Go to Step 21 | Go to Step 22 |
21 | Repair a poor connection or an open in CKT 150 between the heater-A/C control harness connector C2 terminal K and G200. Is the reapir complete? | -- | Go to Defogger System Check | -- |
22 | Repair a poor connection or an open in CKT 241 between the fuse block terminal E2 and the heater-A/C control harness connector C2 terminal C. Is the repair complete? | -- | Go to Defogger System Check | -- |
23 |
Does the rear defogger work properly? | -- | Go to Step 24 | Go to Step 5 |
24 | Replace the rear window defogger relay. Refer to Rear Window Defogger Relay Replacement . Is the repair complete? | -- | Go to Defogger System Check | -- |
25 | Test to see if the RR DEFOG Fuse in the fuse block is open. Is the RR DEFOG Fuse in the fuse block open? | -- | Go to Step 26 | Go to Step 14 |
26 | Repair the short to ground in CKT 1040. Is the repair complete? | -- | Go to Defogger System Check | -- |
