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Home >> Chevrolet >> 2008 >> Impala LS, 3.5 K >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Lighting Systems) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Testing >> Dome Lamp Circuit Test

Dome Lamp Circuit Test

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the (C1 Sedan, C2 Coupe) harness connector at the dome lamp.
  2. Ignition OFF, test for less than 5.0 ohms of resistance between the appropriate ground circuit terminal listed below and ground.
    • Sedan terminal B
    • Coupe terminal A C2
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the appropriate supply voltage circuit terminal listed below and ground.
    • Sedan terminal A
    • Coupe terminal A C1
  4. Command the Courtesy Lamp 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 supply voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the dome lamp.
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