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Home >> Chevrolet >> 2006 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Lighting Systems) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Testing >> Interior Backlighting Circuit Test

Interior Backlighting Circuit Test

WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the component with the inoperative backlighting.
  2. Test for less than 5.0 ohms of resistance between the appropriate component ground circuit terminal listed below and ground.
    • Headlamp Switch terminal 8
    • Hazard Switch terminal B
    • Instrument Panel Cluster (IPC) terminal 6
    • Ashtray Lamp terminal B
    • HVAC Control Module terminal 11 C1
    • Radio terminal 8 C1
    • Driver Information Display Switch terminal 5
    • Traction Control Switch terminal A
    • Reverse Lockout Solenoid terminal D C2
    • Garage Door Opener Transmitter terminal 3
    • Sunroof Switch terminal 5
    • Left Rear Door Window Switch terminal F
    • Right Rear Door Window Switch terminal F
    • Right Steering Wheel Control Switch terminal 1
    • Left Steering Wheel Control Switch terminal 8
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the appropriate component supply voltage circuit terminal listed below and ground.

    Incandescent Dimming

    • Headlamp Switch terminal 7
    • Hazard Switch terminal A
    • Instrument Panel Cluster (IPC) terminal 8
    • Ashtray Lamp terminal A
    • Traction Control Switch terminal D
    • Reverse Lockout Solenoid terminal C C2
    • Garage Door Opener Transmitter terminal 2
    • Sunroof Switch terminal 3
    • Left Rear Door Window Switch terminal B
    • Right Rear Door Window Switch terminal B

    LED Dimming

    • HVAC Control Module terminal 2 with C67 C2 or CJ2 C3
    • Radio terminal 7 C1
    • Driver Information Display Switch terminal 4
    • Right Steering Wheel Control Switch terminal 2
    • Left Steering Wheel Control Switch terminal 6
  4. Ignition ON, command the appropriate Incandescent Dimming or LED Dimming 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 OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM
    • 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.
  5. If all circuits test normal, test or replace the component with the inoperative backlighting.
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