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Home >> Chevrolet >> 2007 >> 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 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 harness connector at the component with the inoperative backlighting.
  2. Test for less than 5.0 ohms of resistance between the appropriate ground circuit terminal listed below and ground.
    • Headlamp Switch terminal 8
    • Instrument Panel Cluster (IPC) terminal 6
    • Driver Window Switch terminal F
    • Driver Door Lock Switch terminal F
    • Outside Rearview Mirror Switch terminal B
    • Passenger Window Switch terminal C
    • Passenger Door Lock Switch terminal F
    • Radio terminal 8 C1
    • HVAC Control Module terminal 10 C1
    • Driver Information Display Switch terminal 5
    • Left Steering Wheel Controls terminal 8
    • Right Steering Wheel Controls terminal 1
      • 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.
    • Headlamp Switch terminal 7
    • Instrument Panel Cluster (IPC) terminal 8
    • Driver Window Switch terminal B
    • Driver Door Lock Switch terminal G
    • Outside Rearview Mirror Switch terminal E
    • Passenger Window Switch terminal B
    • Passenger Door Lock Switch terminal G
    • Radio terminal 7 C1
    • HVAC Control Module terminal 1 C1
    • Driver Information Display Switch terminal 4
    • Left Steering Wheel Controls terminal 6
    • Right Steering Wheel Controls terminal 2
  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 not the specified value, test the signal circuit terminal E for a short to ground. 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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