Reading Lamps Malfunction

Reading Lamps Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The inadvertent power supply voltage circuit of the body control module (BCM) provides battery positive voltage to the reading lamps. The reading lamps and switch are integral to the courtesy/reading lamp assembly. When the switch is closed, voltage is supplied and the lamp illuminates.

Circuit/System Verification

Ignition ON, turn the reading lamps on and off. The reading lamps should turn on and off.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at an affected courtesy/reading lamp center.
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 listed inadvertent power supply circuit terminal and ground.

* Front terminal A
* 2nd and 3rd row terminal C

^ 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 courtesy/reading lamp center, and remove the reading lamp bulb.
5. Connect a test lamp across the bulb terminals.
6. Ignition ON, turn the reading lamp switch on and off. The test lamp should turn on and off when changing between the commanded states.

^ If the test lamp is always on, replace the affected courtesy/reading lamp center.

^ If the test lamp is always off, replace the affected courtesy/reading lamp center.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Dome and Reading Lamp Bulb Replacement (Overhead Console) Dome and Reading Lamp Bulb Replacement (Dome Lamp)