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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 859 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2580 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the BCM connector C4.
  2. Ignition ON, test for voltage at the BCM harness connector terminal 16.
    • If voltage is present, test the control circuit for a short to voltage. If all circuits/connections test normal, replace the underhood fuse block.
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