Reading Lamps Malfunction
Reading 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 voltage to the dome/reading lamps, sunshade, instrument panel compartment lamp and the center console compartment lamp. Each lamp contains a control switch than enables the operator the turn any of the lamps ON and OFF as desired.
Reference Information
Schematic Reference
Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Interior Lighting Systems Description and Operation (Interior Lighting Systems Description and Operation)
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 Verification
Ignition ON, observe the function of the E37F dome/reading lamps-front and the E37B dome/reading lamps-2nd row while turning each light ON and OFF by using their respective control switches. Each light should turn ON and OFF from each switch.
If both dome/reading lamps are inoperative, refer to All Dome/Reading Lamps Inoperative.
If the E37F dome/reading lamps-front is inoperative, refer to Single Dome/Reading Lamp Inoperative
If the E37B dome/reading lamps-2nd row is inoperative, refer to Single Dome/Reading Lamp Inoperative
Circuit/System Testing
All Dome/Reading Lamps Inoperative
1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
• If the test lamp does not illuminate test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X5 harness connector and disconnect X7 harness connector the at the K9 BCM.
4. Connect a 15A fused jumper wire between the ignition circuit terminal 2 and B+.
5. Command the E37F dome/reading lamps-front and the E37B dome/reading lamps-2nd row ON and OFF by using their respective control switches. Each lamp should turn ON and OFF while changing between the commanded states.
• If the jumper wire fuse immediately opens, test the ignition circuit for a short to ground.
• If the jumper wire fuse opens while commanding a E37 dome/reading lamp ON, replace the E37 dome reading lamp.
6. If all circuits test normal, replace the K9 BCM.
Single Dome/Reading Lamp Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate E37 dome/reading lamp.
2. Test for less than 30 ohm between the ground circuit terminal 6 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 ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the control circuit for an open/high resistance.
4. If all circuits test normal, replace the bulb or test or replace the E37 Dome/Reading Lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Dome and Reading Lamp Replacement - Front (Dome and Reading Lamp Replacement - Front)
* Dome and Reading Lamp Replacement - Rear (Dome and Reading Lamp Replacement - Rear)
* Dome Lamp Bulb Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming