For 1990-2009 cars

### 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
--- | --- | --- | --- | ---
Shift Lock Control Solenoid Control | B2705 02 | B2705 05 | B2705 05 | --
Shift Lock Control Solenoid Ground | -- | B2705 05 | -- | --

### Circuit/System Description

The body control module (BCM) controls the shift lock solenoid by providing battery voltage to the shift lock control solenoid. The BCM utilizes a smart driver to control the voltage supplied to the shift lock solenoid. The smart driver monitors the voltage and current flow of the control circuit.

### Reference Information

#### 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, while pressing the brake pedal, observe the scan tool Brake Lamp Cmd. parameter. The reading should be ON with the brake pedal pressed.

⇒ | If not the specified parameter, refer to Stop Lamps Malfunction .

2. Ignition ON, observe the scan tool BCM BTSI Solenoid Command parameter. The parameter should change from ON to OFF when the brake pedal is depressed.

⇒ | If not the specified parameter, replace the BCM.

3. Press the brake pedal, the vehicle operator should be able to move the shifter lever out of 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 B 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 B and the control circuit terminal A.
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.

### Component Testing

1. Install a 10A fused jumper wire between the control circuit terminal A and 12 volts. Install a jumper wire between the ground circuit terminal B and ground.
2. Listen for the solenoid to turn ON and OFF.

⇒ | If the function does not perform as specified, replace the shift lock actuator.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming