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Turn Signal/Multifunction Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the turn S78 Turn Signal/Multifunction Switch.
  2. Ignition OFF, test for less than 5.0 Ω between the ground circuit terminal 3 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool Headlamps Flash Switch parameter is Inactive.
  5. If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  6. Verify the scan tool High Beam Select Switch parameter is Inactive.
  7. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  8. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Headlamps Flash Switch parameter is Active.
  9. If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  10. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool High Beam Select Switch parameter is Active.
  11. If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  12. If all circuits test normal, test or replace the S78 Turn Signal/Multifunction Switch.
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