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Home >> Chevrolet >> 2010 >> HHR SS, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B3903 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the CHMSL.
  2. Ignition ON, verify that a test lamp illuminates between the ground circuit terminal B and B+.
    • If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the stop lamp switch signal circuit terminal A and ground.
    • If the test lamp illuminates, test the stop lamp switch signal circuit for a short to voltage.
  4. Test the stop lamp switch signal circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, replace the BCM.
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