Diagnostic Test

BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) CIRCUIT TEST

Fig 1: Measuring Voltage Of Brake Transmission Shift Interlock (BTSI) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the BTSI connector on the shifter.
  NOTE:
  The graphic shows a typical shifter connector. Refer to the appropriate System Wiring Information for the appropriate shifter connector.
3. Connect a 12-volt test light between the Ground and the (K321) Brake Transmission Shift Interlock Solenoid Unlock circuits.
4. Turn the ignition on.
5. While observing the test light, push and release the brake pedal.
  Does the test light illuminate brightly when the brake pedal is pushed?
  
  Yes
  - Replace the shifter in accordance with the Service Information.
  - Perform the Final Verification Test listed below.
  No
  - Trace and repair the open Ground or the Open (K321) Brake Transmission Shift Interlock Solenoid Unlock circuits as necessary.
  - Perform the Final Verification Test listed below.

Final Verification Testing:

ACTION	EXPECTED RESPONSE
1. With the Fobik removed, try to shift out of "PARK".	1. Shifter cannot be shifted out of "PARK".
2. Insert the Fobik into the WIN and leave it at "LOCK." Try to move the shifter out of "Park".	2. Shifter cannot be shifted out of "PARK".
3. Turn Fobik to the "ON" position, with foot off of brake pedal.	3. Shifter CANNOT be shifted out of "PARK".
4. Turn Fobik to the "ON" position and depress the brake pedal.	4. Shifter CAN be shifted out of "PARK".
5. Leave shifter in any gear other than "PARK" and try to return Fobik to the "LOCK" position.	5. Fobik cannot fully return to "LOCK" and cannot be removed.
6. Return shifter to "PARK" and try to remove the Fobik.	6. Fobik can be removed.