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Circuit/System Testing

  1. Ignition OFF, disconnect at the S78 turn signal/multifunction switch.
  2. Ignition ON, verify that the scan tool Headlamps Flash Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 BCM.
  3. Connect a 3 A fused jumper wire between the signal circuit terminal 4 and ground, verify that the scan tool Headlamps Flash 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 K9 BCM.
  4. If all circuits test normal, test or replace the S78 turn signal/multifunction switch.
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