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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed & MOVEABLE Window Systems >> Diagnostic Information and Procedures >> DTC B3821 >> Circuit/System Testing
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Circuit/System Testing

  1. Disconnect the left rear window switch connector and connect a test lamp from the lockout signal circuit to ground.
  2. Ignition ON, verify that the test lamp illuminates while the rear window lockout function is inactive.
    • If the test lamp does not illuminate test the left rear window lockout signal circuit for a short to ground. If the circuit tests normal replace the BCM.
  3. If the circuits test normal replace the left rear window switch.
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