Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | 1 | 1 | -- | -- |
Rear window Defog switch Signal Circuit | 1 | 1 | 2 | -- |
Left Heated Washer Nozzle Control Circuit | 1 | 1 | 2 | -- |
RIGHT Heated Washer Nozzle Control Circuit | 1 | 1 | 2 | -- |
Rear Defog Relay Ground | -- | 1 | -- | -- |
Left Heated Washer Nozzle Ground Circuit | -- | 1 | -- | -- |
RIGHT Heated Washer Nozzle Ground Circuit | -- | 1 | -- | -- |
1. Heated Washer Nozzles Inoperative 2. Heated Washer Nozzles Always On | ||||
Circuit/System Description
The heated washer nozzles have an electrical heating element molded into the nozzle assembly. This prevents washer fluid icing on the nozzles during cold conditions. The heated nozzles operate only when the rear window defogger is activated.
When the rear window defogger is activated, the DEFOG relay switch is closed. This applies B+ to the OSRVM HTR fuse. The OSRVM HTR fuse supplies voltage to both the outside rearview mirror heating element and the heated washer nozzles. Current passes through the washer nozzle heating element, warming the nozzle.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Wiper/Washer System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, press the rear defogger switch. Verify the rear defogger turns ON.
| ⇒ | If the rear defogger does not turn ON, refer to Rear Window Defogger Malfunction. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate heated washer nozzle.
- Test for less than 10 ohms between the ground circuit terminal 2 and ground.
- Ignition ON, rear defogger ON, verify a test lamp illuminates between the control circuit terminal 1 and ground.
- If all circuits test normal, test or replace the heated washer nozzle.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. |
Repair Instructions
