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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1125 (Wiring Systems And Power Management - Service, Troubleshooting & Diagnosis) >> Retained Accessory Power (RAP) Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the automatic transmission shift lever.
  2. With the ignition key out of the ignition and the driver door open, verify a test lamp does not illuminate between the ignition I/II voltage circuit terminal Z1 at the automatic transmission shift lever harness connector and ground.
    • If the test lamp illuminates, test the ignition circuit for a short to voltage. If the circuit tests normal, test or replace the BCM
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