Chevrolet Sonic Repair Manual: Automatic Transmission Shift Lock Control Description and Operation
The automatic transmission park lock control system is a safety device that prevents an inadvertent shift out of PARK. The driver must press the brake pedal before moving the park lever out of the PARK position. The system consists of the following components:
- The automatic transmission park lock solenoid (serviced as the automatic transmission shift lock actuator), is located within the floor shift control assembly.
- The body control module, which controls the voltage supply circuit of the park lock control solenoid.
- The engine control module.
The body control module controls the voltage to the park lock control solenoid through the park lock control solenoid controlled voltage circuit. The following conditions must be met before the body control module will supply voltage to the park lock solenoid:
- The ignition is in the ON position.
- The engine control module sends an input via GMLAN serial data to the body control module indicating the transmission is in the PARK position.
- The body control module determines the brake pedal is applied according the brake pedal position.
Since the park lock control solenoid is permanently grounded, the body control module supplies voltage to the automatic transmission park lock control solenoid, unlocking the park lever allowing the driver to move the park lever out of the PARK position as the solenoid energizes. When the brake pedal is not applied, the body control module turns the control voltage output of the park lock control solenoid OFF, de-energizing the park lock control solenoid. The de-energized solenoid mechanically locks the park lever in the PARK position.
Automatic Transmission Fluid Pressure Test Hole Plug Replacement
Automatic Transmission Fluid Pressure Test Hole Plug Replacement
Callout
Component Name
1
Fluid Pressure Test Plug
...
Automatic Transmission Shift Lock Control Function Check
Warning: When you are doing this inspection, the vehicle could move
suddenly. If the vehicle moves, you or others could be injured.
Before starting this check, be sure there is enough roo ...
Other materials:
Selecting a Station
Seek Tuning
If the radio station is not known:
Briefly press SEEK or
SEEK to automatically search for the
next available station. If a station is not found, the radio switches to a more
sensitive search level. If a station still is not found, the frequency that was
last active begins to p ...
Side Window Defogger Outlet Grille Replacement
Side Window Defogger Outlet Grille Replacement
Callout
Component Name
1
Side Window Defroster Outlet Grille (Qty:?€‰2)
Procedure
Use a flat bladed plastic trim tool to aid in the removal of the grille
ass ...
Brake Drum Surface and Wear Inspection
Special Tools
CH-8001 Dial Indicator Set
For equivalent regional tools, refer to Special Tools.
Warning: Refer to Brake Dust Warning.
With the brake drum removed, clean the brake shoe lining contact surface
of the brake drum with denatured alcohol or an equivalent approved brak ...
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