Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||
1 |
Does the rear defogger grid warm? | -- | Go to Step 2 | Go to Step 3 |
2 | Replace the faulty relay. Is the repair complete? | -- | Go to Defogger System Check | -- |
3 |
Does the test lamp light? | -- | Go to Step 4 | Go to Step 23 |
4 |
Does the test lamp light? | -- | Go to Step 5 | Go to Step 14 |
5 |
Does the test lamp light? | -- | Go to Step 6 | Go to Step 7 |
6 |
Does the test lamp light? | -- | Go to Step 8 | Go to Step 9 |
7 | Repair the open in CKT 293 between the underhood wiring harness junction block and the left IP wiring harness junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
8 |
Does the test lamp light? | -- | Go to Step 10 | Go to Step 11 |
9 | Replace the left IP wiring harness junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
10 |
Does the test lamp light? | -- | Go to Step 12 | Go to Step 13 |
11 | Repair the open in CKT 293 between the rear defogger grid and the left IP wiring harness junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
12 | Repair the open in the rear defogger grid. Refer to Grid Line Repair . Is the repair complete? | -- | Go to Defogger System Check | -- |
13 | Repair the open in CKT 850 between the rear defogger grid and ground splice pack G402. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
14 |
Does the test lamp light? | -- | Go to Step 15 | Go to Step 23 |
15 | Use the J 39200 to backprobe underhood wiring harness junction block connector C3 and measure the voltage between terminal D5 and ground. Does the voltage measure to the specified value? | B+ | Go to Step 16 | Go to Step 23 |
16 |
Does the voltage measure to the specified value? | B+ | Go to Step 17 | Go to Step 18 |
17 | Use the J 39200 to measure the voltage between terminal C and terminal K of heater and A/C control assembly connector C2. Does the voltage measure to the specified value? | B+ | Go to Step 19 | Go to Step 20 |
18 | Repair the open in CKT 41 between the heater and A/C control assembly and the underhood wiring harness junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
19 | Use the J 39200 to measure the voltage between terminal D and terminal K of heater and A/C control assembly connector C2. Does the voltage measure to the specified value? | B+ | Go to Step 21 | Go to Step 22 |
20 | Repair the open in CKT 251 between the heater and A/C control assembly and ground splice pack G204. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
21 | Replace the heater and A/C control assembly. Refer to Control Assembly Replacement in HVAC Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
22 | Repair the open in CKT 193 between the heater and A/C control assembly and the underhood wiring harness junction block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Defogger System Check | -- |
23 | Replace the underhood wiring harness junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | Go to Defogger System Check | -- |
