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Courtesy Lamps Malfunction

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

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Courtesy Lamp Control

2

2

1

--

Courtesy Lamp Control

--

2

--

--

1. Courtesy Lamps Always Illuminated

2. Courtesy Lamps do Not Illuminate

Circuit/System Description

Battery voltage for the courtesy lamps is supplied at all times to the body control module (BCM). When the BCM receives a signal to command the courtesy lamps ON, it then applies voltage through the interior/reading lamps and compartment courtesy lamp control circuit.

Reference Information

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

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, switch the dome/reading lamps or dome/reading lamps - row ON and OFF while observing the lamp. The concerning reading lamp should illuminate when switched ON.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the E37B Dome/Reading Lamps - 2nd Row.
  2. Test for less than 5 Ω between the ground circuit terminal 6 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for greater than 11 V between the control circuit terminal 4 and ground.
    4. ⇒If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  4. If all circuits test normal, test or replace the E37B Dome/Reading Lamps - 2nd Row.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Interior Lamp Replacement
    •  Interior Light Bulb Replacement
    • Control Module References for BCM replacement, setup, and programming
   


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