Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the system operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 |
Does the rear defogger turn on? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are both the defogger indicator and the defogger grid inoperative? | -- | Go to Step 4 | Go to Step 5 |
4 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 8 |
5 | Is the defogger grid operative while the defogger indicator is inoperative? | -- | Go to Step 18 | Go to Step 6 |
6 |
Does the test lamp illuminate? | -- | Go to Step 12 | Go to Step 18 |
7 |
Does the test lamp illuminate? | -- | Go to Step 17 | Go to Step 11 |
8 | Connect a test lamp between the HVAC control connector C4 terminal A and ground. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 10 |
9 | Repair a poor connection or an open in the ground circuit of the HVAC control. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
10 | Repair a poor connection or an open in the battery voltage circuit of the HVAC control. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
11 | Repair a poor connection or an open in the ignition 3 voltage circuit of the HVAC control. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
12 | Connect a test lamp between the supply voltage circuit of the rear defogger grid and the ground circuit of the rear defogger grid at the rear defogger grid connector. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate? | -- | Go to Step 13 | Go to Step 14 |
13 | Replace the rear defogger grid. Refer to Rear Lift Window Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- |
14 | Connect a test lamp between the supply voltage circuit of the rear defogger grid and ground. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate? | -- | Go to Step 16 | Go to Step 15 |
15 | Repair a poor connection or an open in the supply voltage circuit of the rear defogger grid. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
16 | Repair a poor connection or an open in the ground circuit of the rear defogger grid. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
17 | Inspect for and repair a short to ground or an open in the supply voltage circuit of the rear defogger grid. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and repair a short or an open? | -- | Go to Step 19 | Go to Step 18 |
18 | Replace the HVAC control. Refer to Control Assembly Replacement in HVAC Systems - Manual. Did you complete the replacement? | -- | Go to Step 19 | -- |
19 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
