The inadvertent power courtesy lamps supply voltage circuit of the body control module (BCM) provides battery positive voltage to each vanity mirror lamp. When the vanity mirror cover on the sunshade is opened, a switch closes to provide a ground circuit and the vanity lamp illuminates.

Schematic Reference

Interior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

Ignition On, fold down the sun visors and verify the vanity lamps illuminate.

1. Ignition OFF, disconnect the harness connector at an affected vanity mirror lamp.
2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the inadvertent power supply circuit terminal A and ground.

⇒	If the test lamp does not illuminate, test the inadvertent power supply circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.

4. Connect the harness connector at the vanity mirror lamp, and remove the vanity lamp bulb.
5. Connect a test lamp across the bulb terminals.
6. Ignition ON, open and close the vanity mirror. The test lamp should turn on and off when changing between the commanded states.

⇒	If the test lamp is always on, replace the affected vanity mirror lamp.

⇒	If the test lamp is always off, replace the affected vanity mirror lamp.

7. If all circuits test normal, test or replace the affected vanity lamp bulb.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.