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Rear Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the X1 and X3 harness connector at the K9 Body Control Module.
  2. Test for less than 0.3 V between the 12 V reference circuit terminal 4 X3 and ground.
  3. If greater than the specified value, test the 12 V Reference circuit for an short to voltage.
  4. Test for less than 0.3 V between the signal circuit terminal 9 X1 and ground.
  5. If greater then the specified value, test the signal circuit for a short to voltage.
  6. Test for infinite resistance between the signal circuit terminal 9 X1 and ground.
  7. If less than the specified value, test the signal circuit for a short to ground.
  8. Test for infinite resistance between the 12 V reference circuit terminal 4 X3 and ground.
  9. If less than the specified value, test the 12 V reference circuit for an short to ground.
  10. Press and hold the rear fog lamp switch button.
  11. Test for 2.0-2.4 kΩ between the signal circuit terminal 9 X1 and the 12 V reference circuit terminal 4 X3.
  12. If not within the specified range, test the 12 V reference circuit and the signal circuit for an open/high resistance. If the circuit test normal, replace the S30 Headlamp Switch.
  13. If all circuit test normal, replace the K9 Body Control Module.
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