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Multifunction Switch Circuit Malfunction

WARNING: This page is about a different car, the 2010 Saturn Sky and 2010 Pontiac Solstice. However, it is still accessible from the selected car via links, so may be relevant.
  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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