Circuit/System Testing
- Disconnect the X1 harness connector at the S39 ignition switch.
- 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 a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the ignition circuits listed below for a short to ground.
- terminal 1
- terminal 3
- terminal 4
- terminal 6
NOTE:To help isolate a short to ground, it may be necessary to disconnect modules that are connected to the following circuits:
- Connect the harness connector at the S39 ignition switch.
- Ignition OFF, key out, disconnect the X3 harness connector at the K9 BCM. Verify that a test lamp does not illuminate between the ignition circuit terminals listed below and ground:
- terminal 5
- terminal 6
- terminal 15
- terminal 22
- If the test lamp illuminates, test the ignition circuits for a short to voltage. If the circuit tests normal, replace the S39 ignition switch.
- Ignition in the ACCESSORY position, verify that a test lamp illuminates between the terminal 5 and ground.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, replace the S39 ignition switch.
- Ignition in the CRANK position, verify that a test lamp illuminates between terminal 6 and ground.
- If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, replace the S39 ignition switch.
- If all of the circuits test normal, replace the K9 BCM.