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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1125 (Wiring Systems And Power Management - Service, Troubleshooting & Diagnosis) >> Ignition Can/Cannot Be Turned Off with Transmission in Any Gear >> Circuit/System Verification

Circuit/System Verification

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 park switch.
  2. Ignition OFF, test for less than 5 ohms of resistance between the ground circuit and ground.
    • If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition OFF, disconnect the harness connector at the ignition lock cylinder control actuator.
  4. Ignition ON, verify a test lamp illuminates between the control circuit terminal B and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Connect a test lamp between the control circuit terminal 1 and the control circuit terminal 2.
  6. Ignition ON, cycle the gear shift from PARK to DRIVE. The test lamp should turn ON and OFF when cycled between gears.
    • If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the park switch.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the park switch.
  7. If all circuits test normal, replace the ignition lock cylinder control actuator.
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