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Home >> Chevrolet >> 2007 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 830 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2555 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate dome/courtesy lamp assembly.
  2. Connect a test lamp between B+ and the appropriate control circuit terminal listed below.
    • Dome/reading lamps control terminal B - without C3Y
    • Dome lamp control terminal B - with C3Y
    • Overhead console courtesy/reading lamp control terminal C
  3. Command the Interior Lamps 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 control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the inoperative courtesy/reading lamp assembly.
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