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Home >> GMC >> 2007 >> Acadia SLE, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Wiper System And Washer System) >> Diagnostic Information and Procedures >> DTC B3873 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2013 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the FRT/WSW relay.
  2. Connect a test lamp between the control circuit 86 and B+.
  3. Ignition ON, command the washers ON and OFF using the WASH switch. 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 ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the FRT/WSW fuse.
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