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Home >> Cadillac >> 2009 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System And Washer System >> Diagnostic Information and Procedures >> Moisture Sensing Feature Inoperative >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the outside moisture sensor.
  2. Test for less than 5.0 ohms of resistance between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between accessory voltage circuit terminal 4 and ground.
    • If the test does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the harness connector at the outside moisture sensor.
  5. Disconnect the (X4) harness connector at the body control module (BCM).
  6. Ignition ON, test for 8-10 volts between the signal circuit terminal 18 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the outside moisture sensor.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the outside moisture sensor.
  7. Ignition ON, test for 4.0-8.5 volts between the signal circuit terminal 14 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the outside moisture sensor.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the outside moisture sensor.
  8. If all circuits test normal, replace the BCM.
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