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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1936 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> DTC B370C or B370D >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. 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 outside moisture sensor.
  2. Test for less than 5.0 ohms 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 ignition voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
  4. Ignition ON, test for 4.0 - 8.5 volts between the control circuit terminal 1 and ground.
    • If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, connect the harness connector at the windshield outside moisture sensor.
  6. Disconnect the X4 harness connector at the BCM.
  7. Ignition ON, test for 8.0 - 10.0 volts between the signal circuit terminal 18 and ground.
    • 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 windshield outside moisture sensor.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the windshield outside moisture sensor.
  8. If all circuits test normal, replace the BCM.
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