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 - front and left and right sunshade lamps via the courtesy lamp control circuit. When a sunshade mirror is opened, the switch contact close allowing battery voltage to flow illuminating the respective lamps. The front reading lamps are controlled by individual switches that are activated by the operator 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 vehicle ON/OFF switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.
Diagnostic Aids
When the F7DR (INT LAMPS) fuse is open, both dome lamps, sunshade lamps, reading lamps, and backup lamps will be inoperative. DTC B2545 will also set for the backup lamps when the vehicle is placed in the reverse gear.
Reference Information
Schematic Reference
* Interior Lights Dimming Schematics Interior Lights Dimming Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
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 Programming and Relearning for scan tool information
Circuit/System Testing
1. Vehicle OFF, disconnect the harness connector at the inoperative courtesy lamp.
2. Vehicle OFF, scan tool disconnected, all doors closed, all accessories OFF, and wait 2 minutes. Test for less than 10 ohm between the appropriate ground circuit terminal listed below and ground:
* E37F dome/reading lamps - front - terminal 6
* A31L sunshade - left - terminal B
* A31R sunshade - right - terminal B
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the appropriate control circuit terminal listed below and ground:
* E37F dome/reading lamps - front - terminal 1
* A31L sunshade - left - terminal A
* A31R sunshade - right - terminal A
4. Vehicle in Service Mode, command the Inadvertent Load ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, replace the inoperative courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Sunshade Illuminated Mirror Lamp Bulb Replacement Sunshade Illuminated Mirror Lamp Bulb Replacement
* Dome and Reading Lamp Replacement Service and Repair
* Control Module References Programming and Relearning for BCM replacement, setup, and programming