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 |
|---|---|---|---|---|
Heated Mirror Switch Ignition | 2 | 2 | -- | -- |
Heated Mirror Control | 2 | 2 | 1 | -- |
Heated Mirror Ground | -- | 2 | 2 | -- |
Heated Mirror Indicator Ground | -- | 3 | 3 | -- |
1. Heated Mirror Always On 2. Heated Mirror Inoperative 3. Heated Mirror Indicator Inoperative | ||||
Circuit/System Description
Voltage is available at the heated mirror switch through the ignition circuit with the ignition switch in the ON position. When the heated mirror switch is closed, voltage is available at the outside mirror switch indicator and becomes illuminated. The indicator remains illuminated until the switch is open or the ignition is OFF.
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics
Connector End View Reference
Description and Operation
Outside Mirror Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, command the heated outside rearview mirrors ON and OFF by using the heated mirror switch. The heated mirror switch indicator should illuminate ON and OFF when changing between the commanded states.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the heated mirror switch.
- Test for less than 1.0 ohm between the heated mirror switch ground circuit terminal 4 and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
- If all circuits test normal, test or replace the heated mirror switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. |
Component Testing
- Ignition OFF, disconnect the harness connector at the heated mirror switch
- Test for infinite resistance between the control circuit terminal 2 and the ignition circuit terminal 1 with the switch in the open position.
- Test for less than 5 ohms of resistance between the control circuit terminal 2 and the ignition circuit terminal 1 with the switch in the closed position.
| ⇒ | If not the specified value, replace the heated mirror switch. |
| ⇒ | If greater than the specified range, replace heated mirror switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
