Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check? | -- | Go to Step 2 | Go to Defogger System Check |
2 |
Does Zone 1 turn ON followed by Zone 2? | -- | Go to Step 6 | Go to Step 3 |
3 | Use the scan tool to command the rear defogger on. Does Zone 1 turn ON followed by Zone 2? | -- | Go to Step 4 | Go to Step 5 |
4 | Replace the HVAC control assembly. Refer to Control Assembly Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
5 | Replace the HVAC programmer. Refer to Programmer Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
6 |
Does the test lamp light? | Go to Step 10 | Go to Step 7 | |
7 | Repair the open in CKT 1240 (ORN) relay 1 or circuit 1440 (ORN) relay 2. Is the repair complete? | -- | System OK | Go to Step 8 |
8 | Repair the short to ground in CKT 1240 (ORN) relay 1 or circuit 1440 (ORN) relay 2. Is the repair complete? | -- | System OK | Go to Step 9 |
9 | Repair the short to ground in CKT 270 (TAN) relay 1 or circuit 293 (PPL) relay 2. Is the repair complete? | -- | System OK | |
10 | Connect a test lamp from ground to relay 1 terminal C1 or relay 2 terminal C5. Does the test lamp light? | -- | Go to Step 12 | Go to Step 11 |
11 | Repair the open or short in circuit 41 Is the repair complete? | -- | System OK | -- |
12 |
Does the test lamp light? | -- | Go to Step 15 | Go to Step 13 |
13 | Inspect circuit 1777 (RED) relay 1 or circuit 193 (WHT) relay 2 for an open. Was an open found and repaired? | -- | System OK | Go to Step 14 |
14 | Replace the HVAC programmer. Refer to Programmer Replacement in HVAC. Is the repair complete? | -- | System OK | -- |
15 |
Does the test lamp light? | -- | Go to Step 16 | Go to Step 17 |
16 | Replace the suspect relays. Is the repair complete? | -- | System OK | -- |
17 | Repair the open in CKT 270 (TAN) relay 1 or circuit 293. Is the repair complete? | -- | System OK | Go to Step 18 |
18 | Repair circuit 1050 (BLK). Is the repair complete? | -- | System OK | -- |
