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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the WPR Relay from the underhood fuse block.
  2. Test for less than 5 ohms of resistance between the ground circuit terminal 86 and ground.
    • If greater than 5 ohms, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the wiper relay control circuit terminal 85 and ground.
  4. Ignition ON, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the BCM.
  5. If all circuits test normal, test or replace the WPR relay.
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