Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The rear defogger does not operate when the rear defogger button is pressed. | ||||
1 | Were you sent here from the defogger system check? | -- | Go to Defogger System Check . | |
2 |
Does the request for the rear defogger relay change from ON to OFF? | -- | ||
3 | Using the scan tool, command the defogger relay on. Did the relay click? | -- | ||
4 | Measure the voltage at terminal A of the rear window defogger. Is the voltage above the specified value? | 10.5 V | ||
5 | Measure the voltage to terminal C5 connector C3 of the rear junction block and ground. Is the voltage above the specified value? | 10.5 V | ||
6 | Inspect for a loose connection at the Rear Integration Module (RIM). If terminal contact is OK, Replace the RIM. Refer to Body Control Module Replacement in Body Control Systems. Is the repair complete? | -- | -- | |
7 | Measure resistance of the Rear Defog relay windings. Is resistance within the specified value? | 70-90 ohms | ||
8 | Repair open in CKT 193 (WHT). Is the repair complete? | -- | -- | |
9 | Repair the rear window defogger ground. Is the repair complete? | -- | -- | |
10 | Repair open in CKT 293 (PPL). Is the repair complete? | -- | -- | |
11 | Replace the RR DEFOG relay? Is the repair complete? | -- | -- | |
12 | Use a known good relay. Is the voltage at terminal 5, connector C3 of the Rear Junction Block below the specified value? | 10.5 V | -- | |
13 | Replace the Rear Junction Block. Is the repair complete? | -- | -- | |
14 | Confirm proper operation of the rear window defogger. Is the rear defogger operating correctly? | -- | System OK | -- |
