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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 and X3 harness connector at the K9 Body Control Module.
  2. Ignition ON, test for less than 0.3 V at the K9 Body Control Module signal circuit harness terminal 9 X1 and ground.
    • If greater then the specified value, test the signal circuit for an short to voltage.
  3. Test for less than 0.3 V at the K9 Body Control Module 12 V reference circuit harness terminal 4 X3 and ground.
    • If greater than the specified value, test the 12 V reference circuit for a short to voltage.
  4. Ignition OFF, test for infinite resistance between the K9 Body Control Module signal circuit harness terminal 9 X1 and ground.
    • If lower than the specified value, test the signal circuit for a short to ground.
  5. Test for infinite resistance between the K9 Body Control Module 12 V reference circuit harness terminal 4 X3 and ground.
    • If lower than the specified value, test the 12 V reference circuit for a short to ground.
  6. Press and hold the front fog lamp switch button.
  7. Test for 2.6-3.2 kΩ between the K9 Body Control Module 12 V reference circuit harness connector X3 terminal 4 and the K9 Body Control Module signal circuit harness terminal 9 X1.
    • If not within the specified range, test the 12 V reference circuit and the signal circuit for an open/high resistance. If the circuits test normal, replace the S30 Headlamp Switch.
  8. If all circuits test normal, replace the K9 Body Control Module.
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