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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 consist of the following components:
• The automatic transmission shift lock control solenoid.
• The automatic transmission park lock solenoid (Regal only).
• The automatic transmission shift lock control switch.
• The transmission range switch.
Regal
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 and park lock solenoids. The transmission range switch provides a path to ground in the PARK position. With the automatic transmission shift lock control and park lock solenoids energized the shift lever is locked 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 and park lock solenoids to release. This allows the shift lever to move from the PARK position.
Do the brake lights work ? If not could be cause by bad brake light switch .
Symptoms - Automatic Transmission Shift Lock Control
Important: Review the system operation in order to familiarize yourself with the system functions. Refer to LINK. Automatic Transmission Shift Lock Control Description
Visual/Physical Inspection
• Inspect for aftermarket devices which could affect the operation of the Brake Shift Interlock Control System. Refer to Checking Aftermarket Accessories in Wiring Systems.
• 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.
Step
Action
Value(s)
Yes
No
Schematic Reference: Shift Lock Control Schematics
DEFINITION: This table will test a operation of the automatic transmission shift lock control system
1
Did you review the automatic transmission shift lock control description and perform the necessary inspections?
--
YES - Go to Step 2
NO - Go to Automatic Transmission Shift Lock Control Description
2
Verify the fault is present.
Does the system operate normally?
--
YES - Go to Testing for Intermittent Conditions and Poor Connections
NO - Go to Step 3
3
Turn ON the ignition, with the engine OFF.
Press and hold the brake pedal.
Attempt to move the shift lever out of the PARK position.
Does the shift lever move out of the PARK position?
--
YES - Go to Step 4
NO - Go to Automatic Transmission Shift Lock Control Always On with Ignition in Run
4
Release the brake pedal.
Block the wheels and apply the parking brake.
Attempt to move the shift lever out of the PARK position.
Does the shift lever move out of the PARK position?
--
Go to Automatic Transmission Shift Lock Control Inoperative
Go to Testing for Intermittent Conditions and Poor Connections
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