Ignition Can/Cannot Be Turned Off with Transmission in Any Gear
Ignition Can/Cannot Be Turned Off with Transmission in Any Gear
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category
Diagnostic Fault Information
Circuit/System Description
If the vehicle is equipped with automatic transmission and a floor mounted console gear shift, it has an electronic park lock system. The electronic park lock system purpose is to prevent the ignition key from being turned to the OFF position when the transmission is in any position other than PARK and the vehicle may still be moving. The electronic park lock system consists of an ignition lock cylinder solenoid, and a park position switch that is located in the A/T shift lock control switch. The ignition lock cylinder solenoid contains a pin that is spring loaded to mechanically prevent the ignition key cylinder from being turned to the lock position when it is not energized. The park position switch receives voltage from the body control module (BCM) when the ignition is turned ON. When the transmission shift selector is in PARK, the park position switch closes and energizes the key capture solenoid actuator retracting the pin, allowing the ignition switch to be turned OFF. If vehicle power is lost, power is lost to the ignition switch, the ignition switch has a fault, and/or the transmission is not in the Park position the operator will not be able to turn the ignition key to the lock position and will not be able to remove the ignition key from the column.
Diagnostic Aids
* Verify that the transmission shift selector indicator matches the position of the gear shift lever while selecting between the Park, Reverse, Drive and Low positions.
* Lost power to the ignition switch or a faulty ignition switch can prevent the ignition key from turning to the lock position and prevent ignition key removal from the column.
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Electronic Park Lock Description and Operation Electronic Park Lock
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Circuit/System Verification
1. Ignition OFF, gear shift selector in PARK, ignition ON.
2. Verify that S39 ignition switch can be rotated to the ON position.
• If the ignition switch cannot be rotated to the ON position and Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder has NOT been performed
Refer to Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder.
• If the ignition switch can not be rotated to the ON position and Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder has been performed
Refer to Circuit/System Testing.
• If the ignition switch can be rotated to the ON position
3. Ignition ON, gear shift selector in NEUTRAL, ignition OFF.
4. Verify that the S39 ignition switch cannot be rotated to the LOCK position.
• If the ignition switch can be rotated to the LOCK position and Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder has NOT been performed
Refer to Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder.
• If the ignition switch can be rotated to the LOCK position and Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder Ignition Key Cannot Be Inserted, Rotated, or Removed from the Ignition Lock Cylinder has been performed
Refer to Circuit/System Testing.
• If the ignition switch cannot be rotated to the LOCK position
5. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S3 transmission shift lever. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition OFF, connect the harness connector at the S3 transmission shift lever. Disconnect the harness connector at the M93 key capture solenoid actuator, ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate
1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp illuminates
5. Verify that a test lamp does not illuminate between the ignition circuit terminal 1 and the control circuit terminal 2 with the gear shift selector in NEUTRAL.
• If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the S3 transmission shift lever.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S3 transmission shift lever.
• If the test lamp does not illuminate
6. Verify that a test lamp illuminates between the ignition circuit terminal 1 and the control circuit terminal 2, with the gear shift selector in PARK.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the S3 transmission shift lever.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the S3 transmission shift lever.
• If the test lamp illuminates
7. Test or replace the M93 key capture solenoid actuator.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Control Module References Control Module References for BCM replacement, programming, and setup