Shift Interlock System Chevrolet Monte Carlo VI

Scheme 377

Scheme 378

Scheme 379

Automatic Transmission Shift Lock Control Connector End Views

A/T Shift Lock Control Solenoid Connector End Views Connector Part Information 12052832 2-Way F Metri-Pack 150 Series (BLK) Pin Wire Color Circuit No. Function A DK GRN/ WHT 1135 A/T Shift Lock Control Solenoid Supply Voltage B TAN/WHT 816 A/T Shift Lock Solenoid Supply Voltage

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 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.

Test Description

The numbers below refer to the step numbers 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. 4: Checks for Diagnostic Trouble Codes (DTCs) in the BCM and the PCM.
3. 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.

Diagnostic System Check - Automatic Transmission Shift Lock Control

Scan Tool Output Controls

Scan Tool Output Controls

Scan Tool Data List

Body Control Module (BCM)

Diagnostic Trouble Code (DTC) List

Diagnostic Trouble Code (DTC) List

Circuit Description

The body control module (BCM) controls the automatic transmission shift lock control solenoid ground circuit and monitors the voltage of the ground control circuit.

Conditions for Running the DTC

The control ground circuit of the automatic transmission shift lock control solenoid must be OFF.

Conditions for Setting the DTC

1. The body control module (BCM) detects the controlled ground circuit voltage is approximately equal to ground in the OFF state.
2. The condition above must be present for more than 0.3 seconds.
3. This DTC will be set after 20 seconds due to possible false failures.

Action Taken When the DTC Sets

The BCM stores DTC B2712 in memory.

Conditions for Clearing the DTC

1. A current DTC B2712 will clear if the short to ground or open in the controlled ground circuit of the automatic transmission shift lock control solenoid is no longer detected by the body control module (BCM).
2. A history DTC B2712 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
3. A scan tool may be used to clear the DTC.

Diagnostic Aids

1. If DTC B2712 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/monte-carlo/vi-1999-2007/remont/body-electrical/#wiring-systems-introduction__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to ground or open in the controlled ground circuit of the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid coil is intermittently shorted to ground internally. The body control module (BCM) is intermittently shorted to ground internally.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: Listen for an audible click when the automatic transmission shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
2. 3: Tests for voltage at the automatic transmission shift lock control solenoid.
3. 4: Verifies that the body control module (BCM) is providing ground to the automatic transmission shift lock control solenoid.
4. 5: Tests if ground is constantly being applied to the automatic transmission shift lock control solenoid.
5. 16: The body control module must be programmed for the vehicle RPO configuration.

DTC B2712

The body control module (BCM) controls the automatic transmission shift lock control solenoid ground circuit and monitors the voltage of the ground control circuit.

The controlled ground circuit of the automatic transmission shift lock control solenoid must be ON.

1. The body control module (BCM) detects the controlled ground circuit voltage is approximately equal to battery voltage in the ON state.
2. The condition above must be present for more than 0.3 seconds.
3. This DTC will be set after 20 seconds due to possible false failures.

The BCM stores DTC B2713 in memory.

1. The body control module (BCM) determines that the controlled ground circuit of the automatic transmission shift lock control solenoid is no longer shorted to battery voltage.
2. A history DTC B2713 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
3. A scan tool may be used to clear the DTC.

1. If DTC B2713 is a history DTC, the fault may be intermittent. Refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/monte-carlo/vi-1999-2007/remont/body-electrical/#wiring-systems-introduction__testing-for-intermittent-conditions-and-poor) in Wiring Systems.
2. The following conditions may cause an intermittent malfunction to occur: An intermittent short to battery voltage in the controlled ground circuit of the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid coil is shorted to battery voltage internally. The body control module (BCM) is shorted to battery internally.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: Listen for an audible click when the automatic transmission shift lock control solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
2. 3: Tests for an internal short of the automatic transmission shift lock control solenoid. Command both ON and OFF states. Repeat the commands as necessary.
3. 4: Tests if voltage is constantly being applied to the automatic transmission shift lock control solenoid control circuit.
4. 8: The body control module must be programmed for the vehicle RPO configuration.

DTC B2713

Symptoms - Automatic Transmission Shift Lock Control

1. Perform the «Diagnostic System Check - Automatic Transmission Shift Lock Control»(/chevrolet/monte-carlo/vi-1999-2007/remont/automatic-trans/#shift-interlock-system) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Automatic Transmission Shift Lock Control Description and Operation»(/chevrolet/monte-carlo/vi-1999-2007/remont/automatic-trans/#shift-interlock-system) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the BCM. Refer to «Checking Aftermarket Accessories»(/chevrolet/monte-carlo/vi-1999-2007/remont/body-electrical/#wiring-systems-introduction__checking-aftermarket-accessories) in Wiring Systems.
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. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

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»(/chevrolet/monte-carlo/vi-1999-2007/remont/automatic-trans/#shift-interlock-system__shift-lever-does-not-move-with)
2. «Shift Lever Can Be Moved without Brake Pedal Depressed»(/chevrolet/monte-carlo/vi-1999-2007/remont/automatic-trans/#shift-interlock-system__shift-lever-can-be-moved-without)

Shift Lever Does Not Move with Brake Pedal Depressed

Shift Lever Does Not Move with Brake Pedal Depressed

Shift Lever Can Be Moved without Brake Pedal Depressed

Shift Lever Can Be Moved without Brake Pedal Depressed

Removal Procedure

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/monte-carlo/vi-1999-2007/remont/body-electrical/#battery-charging-system-starting-system) in Engine Electrical.
2. Remove the center console. Refer to «Console Replacement - Front Floor (Impala)»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) or «Console Replacement - Front Floor (Monte Carlo)»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
3. Disconnect the automatic shift lock actuator electrical connector.
4. Remove the automatic shift lock actuator from the pivot point (1), the base of the shift lock control and the vehicle.

Installation Procedure

1. Install the automatic shift lock actuator to the base of the shift lock control and the pivot point (1).
2. Connect the automatic shift lock actuator electrical connector.
3. Install the center console. Refer to «Console Replacement - Front Floor (Impala)»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) or «Console Replacement - Front Floor (Monte Carlo)»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages and Console.
4. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/chevrolet/monte-carlo/vi-1999-2007/remont/body-electrical/#battery-charging-system-starting-system) in Engine Electrical.

1. Remove the knee bolster bracket. Refer to «Knee Bolster Bracket Replacement - Left»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages, and Console.
2. Disconnect the automatic shift lock actuator electrical connector.
3. Remove the actuator from the steering column ball studs.

1. Install the automatic shift lock control actuator to the steering column ball studs.
2. Connect the automatic shift lock actuator electrical connector.
3. Place the column in the neutral position.
4. Adjust the automatic shift lock control actuator. Pull out the tab (1) on the adjuster block side (2) of the actuator. Press on the adjuster block (2) in order to compress the internal adjuster spring and disengage the adjuster teeth. Slide the adjuster block as far away from the actuator as possible. Lock in place by pushing in on the tab (1).
5. Inspect the actuator. The actuator must lock the shift lever clevis when you place the clevis in the park position. If you can move the shift lever without pressing on the brake pedal, readjust the actuator.
6. Install the knee bolster bracket. Refer to «Knee Bolster Bracket Replacement - Left»(/chevrolet/monte-carlo/vi-1999-2007/remont/gauges-instrument-panels/#instrument-panel-gages-and-console) in Instrument Panel, Gages, and 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 engine is running. 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 body control module (BCM)
4. The powertrain control module (PCM)

With the ignition in the ON position, battery positive voltage is supplied 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 BCM provides a ground for the automatic transmission shift lock control solenoid when the transmission is in the PARK position. The BCM receives the transmission gear position information via class2 serial data from the PCM. This causes the automatic transmission shift lock control solenoid to energize and lock the shift lever 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. The BCM turns off the automatic transmission shift lock control solenoid ground circuit when the transmission is out of the PARK position.

See also:
• Scan Tool Does Not Power Up
• Power Mode Mismatch
• Diagnostic Trouble Code (DTC) List
• Diagnostic Trouble Code (DTC) List
• DIAGNOSTIC TROUBLE CODE DEFINITIONS
• Testing for Intermittent Conditions and Poor Connections
• Circuit Testing
• Wiring Repairs
• Stop Lamp Switch Adjustment
• Connector Repairs
• Stop Lamp Switch Replacement
• Checking Aftermarket Accessories
• Battery Negative Cable Disconnect/Connect Procedure
• Console Replacement - Front Floor (Impala)
• Diagnostic System Check - Automatic Transmission Shift Lock Control
• Symptoms - Automatic Transmission Shift Lock Control
• Diagnostic Trouble Code (DTC) List
• Automatic Transmission Shift Lock Control Connector End Views
• Shift Lever Does Not Move with Brake Pedal Depressed
• Shift Lever Can Be Moved without Brake Pedal Depressed