Diagnostic Test

ENGINE CONTROL MODULE (ECM) or POWERTRAIN CONTROL MODULE (PCM) DTCS PRESENT
1. With the scan tool, read ECM or PCM DTCs.
  Are there any brake DTCs present?
  
  Yes
  - Refer to DTC INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 2
BCM DTCS PRESENT
1. With the scan tool, read BCM DTCs.
  Are there any BCM DTCs present?
  
  Yes
  - Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
(K321) BTSI UNLOCK CONTROL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off to the lock position.
2. Disconnect the Shifter Lever Assembly harness connector.
3. Ignition on, engine not running.
4. With the scan tool under BCM, actuate the BTSI.
5. Using a 12-volt test light connected to ground, check the (K321) BTSI Unlock Control circuit.
  Does the test light illuminate brightly while cycling on and off on all (K321) BTSI Unlock Control circuit?
  
  Yes
  - Replace the Shifter Lever Assembly in accordance with the Service Information.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
(K321) BTSI UNLOCK CONTROL CIRCUIT SHORTED TO GROUND
1. Turn the ignition off to the lock position.
2. Disconnect the BCM harness connector.
3. Measure the resistance between ground and the (K321) BTSI Unlock Control circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (K321) BTSI Unlock Control circuit for a short to ground.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 5
(K321) BTSI UNLOCK CONTROL CIRCUIT OPEN
1. Turn the ignition off to the lock position.
  NOTE:
  Check connectors - Clean/repair as necessary.
2. Measure the resistance of the (K321) BTSI Unlock Control circuit between the Shifter Lever Assembly harness connector and the BCM harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (K321) BTSI Unlock Control circuit for an open.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
SHIFTER LEVER ASSEMBLY
1. Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
  Repair
  - Replace the Shifter Lever Assembly in accordance with the Service Information.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to NAG1 TRANSMISSION VERIFICATION TEST .