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Turn Signal/Multifunction Switch Malfunction

  1. Ignition OFF, disconnect the X1 and X2 harness connectors at the turn signal/multifunction switch.
  2. Verify that a test lamp illuminates between B+ and the ground circuit terminal 1.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between B+ and the ground circuit terminal B.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Verify that a test lamp illuminates between B+ and the ground circuit terminal F.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify the scan tool Headlamp Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 2 for short to ground. If the circuit tests normal, replace the BCM.
  6. Verify the scan tool Auto Hdlp. Disable Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for short to ground. If the circuit tests normal, replace the BCM.
  7. Verify the scan tool Flash to Pass Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  8. Verify the scan tool High Beam Select switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
  9. Install a 3A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Headlamp Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  10. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Auto Hdlp. Disable Sw. parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  11. Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Flash to Pass Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  12. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool High Beam Select switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  13. If all circuits test normal, test or replace the turn signal/multifunction switch.
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