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Pinpoint Test E: The Brake Transmission Shift Interlock (BTSI) System Does Not Operate Properly

  1. Normal Operation and Fault Conditions 

    The brake transmission shift interlock (BTSI) system prevents the selector lever from leaving the park position unless certain conditions are met. To release the brake transmission shift interlock (BTSI), the ignition must be on with the engine running, the brake pedal must be applied, and the shift interlock button on the shift knob must be pressed.

    The shift interlock button on the shift knob contains 3 normally open electrical switch contacts. When these 3 contacts are closed, indicating the button is pressed, and the PCM / TCM is not commanding the selector lever to be locked, the GSM will unlock the shift detents, allowing the selector lever to move from the park position. If there is a mismatch between the 3 contacts in the shift interlock button, if 2 or more contacts have been closed for a period of time, indicating a stuck button, or if the shift interlock fails to lock or unlock, a DTC will set.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM P07EC:9E Transmission Range Multi-Function Select Circuit: Stuck On This DTC indicates 1 of the 3 GSM shift interlock button contacts does not match the other 2 contacts.
    GSM P07ED:9F Transmission Range Multi-Function Select Circuit Stuck: Stuck Off This DTC indicates the GSM shift interlock button is stuck. 2 or more of the contacts have been closed for a period of time. This could be caused by the customer holding the shift interlock button.
    GSM P0929:00 Gear Shift Lock Solenoid/Actuator Circuit 'A' Range/Performance: No Sub Type Information This DTC indicates the GSM detected the maximum stall current in the shift interlock solenoid circuit.
    GSM P0929:01 Gear Shift Lock Solenoid/Actuator Circuit 'A' Range/Performance: General Circuit/Electrical Failure This DTC indicates the GSM detected the maximum stall current in the shift interlock motor circuit.
    GSM P0929:07 Gear Shift Lock Solenoid/Actuator Circuit 'A' Range/Performance: Mechanical Failure This DTC indicates the shift interlock solenoid was not able to achieve the lock position.
    GSM P0929:77 Gear Shift Lock Solenoid/Actuator Circuit 'A' Range/Performance: Commanded Position Not Reachable This DTC indicates the shift interlock motor was not able to achieve the lock position.

    Possible Causes 

    • Debris or foreign material on or near the GSM shift interlock button
    • Brake switch fault
    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • GSM
    • The customer held the shift interlock button

  2. E1 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.

    Are any system voltage or internal module diagnostic trouble codes (DTCs) present? 

    Yes  RESOLVE those diagnostic trouble codes (DTCs) first. REFER to the DTC Chart.
    No  GO to  E2

  3. E2 INSPECT THE GSM (GEAR SHIFT MODULE) SHIFT INTERLOCK BUTTON

    • Inspect the shift interlock button on the shift knob for debris or foreign material that could cause it to stick.

    • Press and release the shift interlock button. Make sure it moves freely.

    Is the shift interlock button free of debris and foreign material, and does it move freely? 

    Yes  GO to  E3
    No  Clean any debris or foreign material from the button.If the shift interlock button still sticks after cleaning it, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) - Vehicles With: Console Shift . Otherwise, GO to  E3

  4. E3 CHECK THE OPERATION OF THE BRAKE TRANSMISSION SHIFT INTERLOCK (BTSI) SYSTEM

    • Start the engine.

    • Press the brake pedal.

    • Without pressing the shift interlock button on the shift knob, try moving the selector lever out of Park. The selector lever should be locked in the Park position.

    • Release the brake pedal. Press the shift interlock button on the shift knob and try moving the selector lever out of Park. The selector lever should be locked in the Park position.

    • Press the brake pedal and the shift interlock button on the shift knob and move the selector lever to all gear positions. The selector lever should move to all gear positions.

    • Select PARK.

    Does the brake transmission shift interlock (BTSI) system operate correctly? 

    Yes  GO to  E5
    No  GO to  E4

  5. E4 CHECK THE OPERATION OF THE BRAKE SWITCH

    Access the PCM and monitor the BOO1PID

    Access the BCM and monitor the BRK_PDL_SW2PID

    • Press and release the brake pedal while observing PID BOO1 and PID BRK_PDL_SW2.

    Does the status of PID BOO1 and PID BRK_PDL_SW2 change appropriately as the brake pedal is pressed and released? 

    Yes  GO to  E6
    No  RESOLVE any brake switch diagnostic trouble codes (DTCs) that are present in the PCM or in the BCM. REFER to the Master DTC Chart.

  6. E5 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.

    • Using a diagnostic scan tool, clear all GSM diagnostic trouble codes (DTCs).

    • Ignition OFF.

    • Start the engine.

    • Wait 5 minutes.

    • Press and hold the brake pedal and repeat the following steps 20 times:

      • Press and hold the shift interlock button on the shift knob for 3 seconds.

      • Release the shift interlock button for 3 seconds.

    • Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.

    Is DTC P07EC:9E, P07ED:9F, P0929:00, P0929:01, P0929:07 or P0929:77 present? 

    Yes  GO to  E6
    No  The system is operating correctly at this time. The concern may have been caused by debris or interference on the button.

  7. E6 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the GSM connector.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Connect the GSM connector. Make sure it seats and latches correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) - Vehicles With: Console Shift .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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