For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Disconnect the rear window defogger relay.
2. Turn the ignition switch on.
3. Using a test light, probe between B+ and the rear window defogger relay connector terminal C5.

Is the test light on?

--

Go to Step 4

Go to Step 2

2 | Using a test light, probe between the rear window defogger relay connector terminal B5 and ground. Is the test light on? | -- | Go to Step 7 | Go to Step 3
3 | Replace the rear window defogger relay. Rear Window Defogger Relay Replacement Is the repair complete? | -- | Go to Defogger System Check | --
4 | Check for a short to ground in CKT 193. Is there a short to ground in CKT 193? | -- | Go to Step 5 | Go to Step 6
5 | Repair the short to ground in CKT 193. Is the repair complete? | -- | Go to Defogger System Check | --
6 | Replace the A/C-heater control. Refer to Control Assembly Replacement in HVAC Systems with A/C - Manual. Is the repair complete? | -- | Go to Defogger System Check | --
7 | Repair short to B+ in CKT 293. Is the repair complete? | -- | Go to Defogger System Check | --