Shift Lock Control System: Removal & Installation Chevrolet Silverado 1500

Removal Procedure

1. Disable the SIR system. Refer to «SIR Disabling and Enabling Zone 3»(ref-238196-S42401173072006072400000) .
2. Remove the body control module (BCM). Refer to «Body Control Module Replacement»(ref-238179-S13881127862006072400000) .
3. Put the shift lever clevis into the neutral position.
4. Disconnect the electrical connector.
5. Using a small screwdriver, pry the automatic transmission shift lock control actuator away from the steering column jacket and the cable shift cam.
6. Remove the shift lock control actuator.

Scheme 388

1. Firmly install the shift lock control actuator onto the steering column jacket and the cable shift cam.
2. Connect the electrical connector.
3. Adjust the shift lock control actuator (with the shift lever clevis in the neutral position) in the following way: Pull out the tab (1) on the adjuster block side (2) of the shift lock control actuator. Press on the adjuster block (2) to compress the internal adjuster spring which disengages the adjuster teeth. Slide the adjuster block (2) as far away from the actuator as possible. Lock the adjuster block (2) in place by pushing in on the tab (1).
4. Inspect the shift lock control actuator for the following items: The shift lock control actuator must lock the shift lever clevis when the shift lever clevis is put into the park position. Depress the brake pedal to move the shift lever out of the park position. The actuator will be energized. Readjust the shift lock control actuator if needed.
5. Install the BCM. Refer to «Body Control Module Replacement»(ref-238179-S13881127862006072400000) .
6. Enable the SIR system. Refer to «SIR Disabling and Enabling Zone 3»(ref-238196-S42401173072006072400000) .

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

1. The automatic transmission shift lock control solenoid.
2. The automatic transmission shift lock control switch.
3. The body control module (BCM).
4. The engine control module (ECM), if equipped with a 6.6L engine.
5. The powertrain control module (PCM), if equipped with a 8.1L engine.

With the ignition in the ON position and the shift lever is in PARK, battery positive voltage is supplied from the BCM to the automatic transmission shift lock control solenoid through the normally-closed automatic transmission shift lock control switch. When the transmission control module (TCM) indicates the shift lever is in the PARK position, the ECM/PCM sends a class 2 serial data message to the BCM indicating the transmission is in the PARK position. This allows current to flow through the switch to the automatic transmission shift lock control solenoid. Since the automatic transmission shift lock control solenoid is permanently grounded, the shift lock control solenoid energizes, 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 de-energize, unlocking the shift lever from the PARK position.

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

1. The automatic transmission shift lock control solenoid.
2. The automatic transmission shift lock control switch.
3. 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.