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WIPER 1 Relay Control Test

WARNING: This page is about a different car, the 2008 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X5 harness connector at the BCM
  2. Ignition ON, verify that the low speed wipers are not on.
    • If the low speed wipers are on, test the relay control circuit terminal 20 for a short to voltage. If the circuit tests normal, Replace the underhood fuse block.
  3. Install a 10A fused jumper wirebetween the relay control circuit terminal 20 and B+. Verify the low speed wipers are on.
    • If the low speed wipers are not on, test the relay control circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the underhood fuse block
  4. If all circuits test normal, replace the BCM.
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