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Multifunction Switch Circuit Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the multifunction switch.
  2. Ignition OFF, test for less than 20 ohms of resistance between the low reference circuit terminal 7 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the BCM.
  3. Ignition ON, verify the scan tool Windshield Washer Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Windshield Washer 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.
  5. If all circuits test normal, test or replace the multifunction switch.
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