Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control 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:
• | The automatic transmission shift lock control solenoid. |
• | The automatic transmission shift lock control switch. |
• | The park/neutral position switch. |
With the ignition in the ON position, battery positive voltage is supplied
to the park/neutral position switch. When the transmission is in
the PARK position the contacts in the park/neutral position switch
are closed. This allows current to flow through the switch 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 automatic transmission shift lock control
solenoid is permanently grounded. This energizes the automatic transmission
shift lock control solenoid, locking 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, causing the
automatic transmission shift lock control solenoid to release. This
allows the shift lever to move from the PARK position.