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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
  2. Test for infinite resistance between the control circuit terminal listed below and ground:
    • Right trailer park lamp control terminal 16
    • Left trailer park lamp control terminal 4
    • If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
  3. Test for less than 1 Ω between the control circuit terminals listed below:
    • Control terminal 16 at the K68 trailer lighting control module and control terminal 5 at the X88 trailer connector.
    • Control terminal 4 at the K68 trailer lighting control module and control terminal 7 at the X88 trailer connector.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X88 trailer connector.
  4. If all the circuits test normal, replace the K68 trailer lighting control module.
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