Diagnosis And Testing - Shift Interlock System: Notes

Fig 1: Ignition Key/Switch Positions

Courtesy of CHRYSLER GROUP, LLC

If the shifter cannot be shifted out of Park or can be shifted out of Park without depressing the brake pedal, follow diagnostics procedure below.

Diagnostic and Repair procedure: 

1. Engage the parking brake.
2. Connect the Wi-Tech scan tool to the vehicle.
3. Check for any DTCs that relate to the "Brake Switch or Brake Transmission Shift Interlock" in the WCM (wireless control module), PCM (powertrain control module) and TIPM (totally integrated power module).
4. For all Diagnostic Trouble Codes, perform the appropriate diagnostic procedure(s) and verification procedures according to Tech Connect.
5. Continue to step 6 if shifter still shows condition, otherwise stop and perform  1 for Final Verification Test at the end of this procedure.
6. Using Wi-Tech, under the WCM module in the "Data" screen check for change in state of the following signals. If no change in state then perform corresponding circuit repairs:
   1. "Gated park switch". Push and release button on shifter knob.
   2. "BTSI feedback". Push and release brake pedal.
   3. "Brake switch". Push and release brake pedal.
7. If change in state occurs in steps 6a, 6b, 6c then using Wi-Tech under the WCM module in the "Actuation" screen, actuate BTSI. (If shifter can now be released then follow a), (Otherwise b)
   1. Refer to DIAGNOSIS AND TESTING or DIAGNOSIS AND TESTING and check for mechanical shifter issues.
   2. Go To  1.