Shift Lock Control System: Diagnosis Saturn Aura I

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Automatic Transmission Shift Lock Control

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-301515-S32423278442008101700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-301515-S06578354042008101700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-301515-S28090839972008101700000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Conditions for Running the DTC

1. Ignition ON.
2. The brake pedal is pressed.
3. The transmission is in the PARK position.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal A and ground. 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 A and the control circuit terminal B.
4. Ignition ON, command the scan tool BCM Brake To Shift Control output control ON and OFF. The test lamp should turn ON and OFF as commanded. If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. 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 BCM.
5. If the circuit tests normal, test or replace the shift lock control solenoid.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control. Refer to «Checking Aftermarket Accessories»(ref-301517-S04233661632008101700000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to Transmission Control Lever Malfunction in order to diagnose the symptom.

1. Perform the «Diagnostic System Check - Vehicle»(ref-301515-S32423278442008101700000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-301515-S06578354042008101700000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-301515-S28090839972008101700000) provides an overview of each diagnostic category.

Diagnostic Aids

1. Use a scan tool to verify there are no brake pedal position sensor and/or transmission internal mode switch (IMS) DTCs set that could cause the BCM not to provide battery voltage to the A/T shift lock solenoid.
2. If the automatic transmission shift lock control circuit is shorted to battery positive voltage, the A/T shift lock solenoid will be inoperative. The vehicle will shift out of PARK without depressing the brake pedal.

1. Ignition OFF, disconnect the harness connector at the automatic transmission shift lock actuator.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal A and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal B and ground.
4. Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as commanded. If the test lamp is always ON, test the control circuit for a short to voltage. If all circuits test normal, test or replace the BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If all circuits test normal, test or replace the BCM.
5. If all circuits test normal, test or replace the shift lock control solenoid.

Component Testing

1. Install a 10 A fused jumper wire between the control circuit terminal B and 12 volts. Install a jumper wire between the ground circuit terminal A and ground.
2. Listen for the solenoid to turn ON and OFF. If the function does not perform as specified, replace the shift lock control solenoid.