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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 key in ignition switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit tests normal and the power mode circuit fuse is open, test the signal circuit terminal 4 or terminal 5 (UHA/UHF) for a short to ground.
  3. Verify the scan tool Key In Ignition Status parameter is Key Out.
    • If not the specified value, test the signal circuit terminal 4 or terminal 5 (UHA/UHF) for a short to voltage. If the circuit tests normal, replace the BCM or the RCDLR.
  4. Install a 3A fused jumper wire between the signal circuit terminal 4 or terminal 5 (UHA/UHF) and the B+ circuit terminal 2. Verify the scan tool Key in Ignition Status parameter is Key In.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM or the RCDLR.
  5. If all circuits test normal, test or replace the ignition switch.
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