Shift Interlock Systems Buick LeSabre VIII

Automatic Transmission Shift Lock Control Schematics

See SHIFT INTERLOCKS .

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Diagnostic Starting Point - Automatic Transmission Shift Lock Control

Begin the system diagnosis with the Diagnostic System Check - Automatic Transmission Shift Lock Control . The Diagnostic System Check will provide the following information

1. The identification of the control module(s) which command the system
2. The ability of the control module(s) 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.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 5. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

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Rear Integration Module (RIM)

IGN/Run/Crank: Display indicates ON when the ignition 1 input circuit of the module receives a battery signal from the ignition switch

Brake To Shift Relay: Displays indicates ON when the rear integration module supplies a ground to the brake to shift relay control circuit.

Symptoms - Automatic Transmission Shift Lock Control

Note. Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Transmission Shift Lock Control Description And Operation .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control system.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Shift Lever Does Not Move with Brake Pedal Depressed»(/buick/lesabre/viii-2000-2005/remont/transmission-control-systems/#shift-interlock-systems)
2. «Shift Lever Can Be Moved without Brake Pedal Depressed»(/buick/lesabre/viii-2000-2005/remont/transmission-control-systems/#shift-interlock-systems)

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1. Remove the knee bolster bracket. Refer to «KNEE BOLSTER REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) .
2. Remove the steering column trim covers.
3. Disconnect the automatic transmission shift lock control connector.
4. Use a screwdriver to pry the automatic transmission shift lock control from the steering column support assembly.
5. Remove the automatic transmission shift lock control from the steering column.

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1. Install the automatic transmission shift lock control. Put the column in the NEUTRAL position.
2. Adjust the automatic transmission shift lock control. 2.1. Pull the tab (1) out on the block side (2) of the automatic transmission shift lock control. 2.2. Shift the column into the NEUTRAL position. 2.3. Press on the adjuster block (2) to compress the internal adjuster spring to disengage the adjuster teeth. Slide the adjuster block (2) as far away from the solenoid as possible. 2.4. Shift the column into the PARK position. 2.5. Lock in place by pushing the tab (1) back in.
3. Inspect the automatic transmission shift lock control.
4. Reconnect the automatic transmission shift lock control connector.
5. Install the steering column trim covers.
6. Install the knee bolster bracket. Refer to «KNEE BOLSTER REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) .

Automatic Transmission Shift Lock Control System

The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components

1. The automatic transmission shift lock control solenoid
2. The automatic transmission shift lock control switch
3. The brake to shift relay
4. The Rear Integration Module (RIM)

With the ignition in the ON position, battery positive voltage is supplied to the brake to shift relay coil. When the RIM energizes the brake to shift relay, the brake to shift relay switch contacts close supplying battery voltage to the automatic transmission shift lock control switch. The circuit continues through the normally closed switch to the automatic transmission shift lock control solenoid. The permanently grounded solenoid is energized. This locks the shift linkage in the PARK position. When the driver presses the brake pedal, the contacts in the automatic transmission shift lock control switch open. This causes the automatic transmission shift lock control solenoid to release. This allows the shift lever to move from the PARK position.

See also:
• KNEE BOLSTER REPLACEMENT
• Diagnostic System Check - Automatic Transmission Shift Lock Control