Shift Interlock System Chevrolet Equinox I

Scheme 68

Scheme 69

Automatic Transmission Shift Lock Control Connector End Views

A/T Shift Lock Solenoid Connector Part Information OEM: 12052832 Service: 12101825 2-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A PK 139 Ignition 1 Voltage B WH 816 A/T Shift Lock Solenoid Supply Voltage

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Automatic Transmission Shift Lock Control

Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. 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.

Scan Tool Output Controls

Body Control Module (BCM)

Scan Tool Data List

Body Control Module (BCM)

Powertrain Control Module (PCM)

Circuit Description

The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a controlled ground to the automatic transmission shift lock control solenoid. The BCM utilizes a smart driver to monitor the voltage and current flow of the automatic transmission shift lock control solenoid control circuit. DTC B2707 will set when the BCM detects a short to ground when the solenoid is in the OFF state.

DTC Descriptor

This diagnostic procedure supports the following DTC

DTC B2707 Gearshift Unlock Circuit Low

Conditions for Running the DTC

1. The ignition switch is in the ON position.
2. The brake pedal is released.
3. The transmission is in the PARK position.

Conditions for Setting the DTC

The BCM detects the shift lock control solenoid control circuit is grounded for a minimum of 1 second.

Action Taken When the DTC Sets

The BCM disables shift lock control solenoid operation until the next key cycle.

Conditions for Clearing the DTC

1. A current DTC B2707 will clear when the malfunction is no longer present and the ignition switch is cycled.
2. All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles.

Diagnostic Aids

1. If the A/T shift lock control circuit is shorted to ground, the automatic transmission shift lock control solenoid will be energized. The shift lever will not shift out of PARK position with the brake pedal depressed.
2. Perform the tests while wiggling the wires and connectors. This may often cause an intermittent malfunction to appear. Refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/i-2004-2009/remont/body-electrical/#how-to-diagnosis-repair-the-wiring-systems-testing__testing-for-intermittent-conditions-and-poor) in Wiring Systems.

Test Description

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. 4: Tests for ground at the control circuit of the automatic transmission shift lock control solenoid.

DTC B2707

The body control module (BCM) controls the automatic transmission shift lock control solenoid by providing a controlled ground to the automatic transmission shift lock control solenoid. The BCM utilizes a smart driver to monitor the voltage and current flow of the automatic transmission shift lock control solenoid control circuit. DTC B2708 will set when the BCM detects a short to voltage when the automatic transmission shift lock control solenoid is active.

This diagnostic procedure supports the following DTC

DTC B2708 Gearshift Unlock Circuit High

1. The ignition switch is in the ON position.
2. The brake pedal is depressed.
3. The transmission is in the PARK position.

The BCM detects a short to voltage at the control circuit driver of the automatic transmission shift lock control solenoid for a minimum of 1 second.

1. The BCM disables shift lock control solenoid operation until the next key cycle.
2. The security light, service light and malfunction indicator lamp (MIL) lamp are always ON with the ignition OFF.

1. A current DTC B2708 will clear when the malfunction is no longer present and the ignition switch is cycled.
2. All BCM history codes will clear after 100 ignition cycles with no current codes active during the 100 ignition cycles.

1. If the A/T shift lock control circuit is shorted to battery positive voltage, the automatic transmission shift lock control solenoid will be unlocked. The vehicle will shift out of PARK without depressing the brake pedal.
2. Perform the tests while wiggling the wires and connectors. This may often cause an intermittent malfunction to appear. Refer to «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/equinox/i-2004-2009/remont/body-electrical/#how-to-diagnosis-repair-the-wiring-systems-testing__testing-for-intermittent-conditions-and-poor) in Wiring Systems.

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 the control circuit of the automatic transmission shift lock control solenoid.

DTC B2708

Symptoms - Automatic Transmission Shift Lock Control

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control system. Refer to «Checking Aftermarket Accessories»(/chevrolet/equinox/i-2004-2009/remont/body-electrical/#how-to-diagnosis-repair-the-wiring-systems-testing__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/equinox/i-2004-2009/remont/automatic-trans/#shift-interlock-system__shift-lever-does-not-move-with)
2. «Shift Lever Can Be Moved without Brake Pedal Depressed»(/chevrolet/equinox/i-2004-2009/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. Remove the shift control assembly. Refer to «Shift Control Replacement»(/chevrolet/equinox/i-2004-2009/remont/automatic-trans/#automatic-transaxle-af33-5-introduction-2-of-2) .
2. Disconnect the brake transaxle shift interlock (BTSI) solenoid harness connector.
3. Using a screwdriver, disconnect the plastic retainers at solenoid base and at the park lock lever.
4. Remove the solenoid from the shift control assembly.

Installation Procedure

1. Install the solenoid onto the shift control assembly. Connect the plastic retainers at the solenoid base and at the park lock lever.
2. Connect the BTSI solenoid harness connector.
3. Install the shift control assembly. Refer to «Shift Control Replacement»(/chevrolet/equinox/i-2004-2009/remont/automatic-trans/#automatic-transaxle-af33-5-introduction-2-of-2) .

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 body control module (BCM)
3. The powertrain control module (PCM)

The BCM controls the voltage to the shift lock control solenoid through the shift lock control solenoid controlled voltage circuit. The following conditions must be met before the BCM will supply voltage to the shift lock control solenoid

1. The ignition is in the ON position.
2. The PCM sends a class 2 message to the BCM indicating the transmission is in the PARK position.
3. The BCM determines the brake pedal is not applied according to the stop lamp switch.

When the ignition is in the ON position, the ignition 1 fuse supplies voltage to the automatic transmission shift lock control solenoid as the BCM supplies a ground to the control circuit, mechanically locking the shift lever in the PARK position as the solenoid energizes. When the brake pedal is applied, the BCM turns the ground of the control circuit OFF, de-energizing the shift lock control solenoid. The de-energized solenoid releases the mechanical lock allowing the driver to move the shift lever out of the PARK position. When the transmission is out of the PARK position, the shift lock control solenoid remains de-energized.

See also:
• Diagnostic System Check - Vehicle
• Testing for Intermittent Conditions and Poor Connections
• Body Control System Schematics
• Circuit Testing
• Wiring Repairs
• Connector Repairs
• Control Module References
• Checking Aftermarket Accessories
• Diagnostic Starting Point - Lighting Systems
• Scan Tool Data List
• Shift Control Replacement
• DTC B2707
• Shift Lever Does Not Move with Brake Pedal Depressed
• Shift Lever Can Be Moved without Brake Pedal Depressed