For 1990-2009 cars only
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 |
|---|---|---|---|---|
Vanity Mirror Lamp Control | 1 | 1 | 1 | -- |
Vanity Mirror Lamp -- Left Ground | -- | 1 | -- | -- |
Vanity Mirror Lamp -- Right Ground | -- | 1 | -- | -- |
1. Vanity Mirror Lamp Malfunction | ||||
Circuit/System Description
The vanity mirror lamps are supplied voltage from the BCM via the inadvertent power courtesy lamp control circuit. When the mirror cover is open, the mirror cover switch is closed, providing a ground path for the vanity mirror lamps and illuminating the lamp.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate sunshade.
- Test for less than 10 ohms between the ground circuit terminal B and ground.
- Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
- If all circuits test normal, test or replace the appropriate vanity mirror lamp.
| ⇒ | 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. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
