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Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the S78 Turn Signal/Multi-Function Switch harness connector. Test for less than 5 Ω between the ground circuit terminal 6 and ground.
    • If greater then the specified value, test the ground circuit for an open/high resistance.
  2. Connect the S78 Turn Signal/Multi-Function Switch harness connector.
  3. Disconnect the X3 harness connector at the K9 Body Control Module.
  4. Connect a test lamp between B+ and the signal circuit terminal 11 (X3).
  5. Push/pull the S78 Turn Signal/Multi-Function Switch between the high beam and OFF position. The test lamp should turn ON and OFF as the switch is cycled.
    • If the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the S78 Turn Signal/Multi-Function Switch.
    • If the test lamp is always ON, test the signal circuit for a short to ground. If the circuit test normal, replace the S78 Turn Signal/Multi-Function Switch.
  6. If all circuits test normal, replace the K9 Body Control Module.
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