Circuit/System Testing
- Ignition ON, while pressing the brake pedal, observe the scan tool Brake Lamp Cmd. parameter. The reading should be ON with the brake pedal pressed.
- Ignition OFF, disconnect the harness connector at the automatic transmission shift lock actuator.
- Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Connect a test lamp between the control circuit terminal A and ground.
- Ignition ON, command the scan tool BCM brake to shift control output control ON and OFF. The test lamp should turn ON and OFF as commanded.
- If the test lamp is always ON, test the control circuit for a short to voltage. If all circuits test normal, test or replace the BCM.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If all circuits test normal, test or replace the BCM.
- If all circuits test normal, test or replace the shift lock actuator.