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Multifunction Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the windshield wiper washer multifunction switch.
  2. Ignition ON, test for B+ at the windshield wiper washer multifunction switch Accessory Voltage circuit terminal D
    • If not the specified value, test the Accessory Voltage circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the BCM.
  3. Ignition ON, verify the scan tool Windshield Wiper Switch parameter is Off.
    • If not the specified value, test the Windshield Wiper Switch Low/Pulse Signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the Windshield Wiper Switch Low/Pulse Signal circuit terminal E and B+. Verify the scan tool Windshield Wiper Switch parameter is Low/Mist/High.
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Install a 3A fused jumper wire between the Windshield Wiper Switch High Signal circuit terminal C and ground. Verify the scan tool Windshield Wiper Switch parameter Low/Mist/High.
    • 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.
  6. If all circuits test normal, test or replace the Multifunction Switch.
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