Courtesy Lamps Malfunction
Courtesy Lamps Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies battery voltage to the dome/reading lamps, left and right sunshade lamps, and instrument panel compartment lamp via the courtesy lamp control circuits. When the instrument panel compartment, center console compartment lamp, or a sunshade mirror is opened, the switch contacts close allowing battery voltage to flow illuminating the respective lamps. The front reading lamps are controlled by individual switches that are activated by the occupants when additional cabin lighting is required. In the event that any of these courtesy lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuits to prevent total battery discharge.
Reference Information
Schematic Reference
Interior Lights Schematics Interior Lights Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Interior Lighting Systems Description and Operation Interior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the inoperative courtesy lamp. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground.
* A3L sunshade - left - terminal B
* A3R sunshade - right - terminal B
* E27 instrument panel compartment lamp - terminal 2
* E28 center console compartment lamp terminal 1
* E37LF dome/reading lamps - left front terminal 6
* E37LR dome/reading lamps - left rear terminal 6
* E37RF dome/reading lamps - right front terminal 6
* E37RR dome/reading lamps - right rear terminal 6
• If 5 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 5 ohms
3. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
* A3L sunshade - left - terminal A
* A3R sunshade - right - terminal A
* E27 instrument panel compartment lamp - terminal 1
* E28 center console compartment lamp terminal 2
* E37LF dome/reading lamps - left front terminal 1
* E37LR dome/reading lamps - left rear terminal 1
* E37RF dome/reading lamps - right front terminal 1
* E37RR dome/reading lamps - right rear terminal 1
4. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 body control module.
* X1 - reading lamps
* X7 - courtesy lamps
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the appropriate harness connector listed below at the K9 body control module.
* X1 - reading lamps
* X7 - courtesy lamps
2. Test for less than 1 V between the control circuit terminal and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
5. Test or replace the appropriate courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Center Reading and Courtesy Lamp Replacement Center Reading and Courtesy Lamp Replacement
* Interior Lamp Switch Replacement (Override) Interior Lamp Switch Replacement (Override)Interior Lamp Switch Replacement (Reading) Interior Lamp Switch Replacement (Reading)
* Courtesy Lamp Replacement Courtesy Lamp Replacement
* Sunshade Illuminated Mirror Lamp Lens Replacement Sunshade Illuminated Mirror Lamp Lens Replacement
* Control Module References Control Module References for BCM replacement, programming, and setup