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Transmission Control Lever Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Control

1

1

2

--

Ground

--

1

--

--

  1. Transmission gear lever will not move from PARK with the brake pedal pressed.
  2. Transmission shift control lever will move from PARK without the brake pedal pressed.

Circuit/System Description

The body control module controls the automatic transmission park lock control solenoid by providing a battery positive voltage to the solenoid. The body control module controls the voltage supply circuit to the automatic transmission park lock control solenoid. The BCM monitors the voltage and current flow of the control circuit.

Reference Information

Schematic Reference

Shift Lock Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Automatic Transmission Shift Lock Control Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Ignition ON, observe the scan tool Brake Transmission Shift Interlock Solenoid Actuator Command parameter while pressing and releasing the brake pedal. The parameter should change from Inactive to Active when the brake pedal is depressed.
    2. ⇒If the parameter does not change, refer to Stop Lamps Malfunction .
  2. While pressing the brake pedal, the vehicle operator should be able to move the selector lever out of the park position.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the S3 transmission shift lever.
  2. Ignition OFF, test for less than 30 Ω between the ground circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Install a test lamp between the ground circuit terminal 2 and the control circuit terminal 4.
  4. Ignition ON, command the scan tool Brake Transmission Shift Interlock Solenoid Actuator Active and Inactive. The test lamp should turn ON and OFF when changing between the commanded states.
    5. ⇒If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the K9 body control module.
    ⇒If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
  5. If all circuits test normal, test or replace the S3 transmission shift lever.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Transmission Control Replacement
    • Control Module References for ECM replacement, setup, and programming
   


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