Shift Lever Assembly
SHIFT LEVER ASSEMBLYDESCRIPTION
In vehicles equipped with an automatic transmission, the Shift Lever Assembly (2) is located at the front of the center console (1).
The Shift Lever Assembly provides four shift positions which are:
- Park (P)
- Reverse (R)
- Neutral (N)
- Drive (D)
In the Drive (D) position, five forward gears are available. On the Shift Lever Assembly next to the "D" is a "+" symbol and a "-" symbol. While in the Drive position, pushing the shift lever to the right toward the "+" on the Shift Lever Assembly will upshift one range at a time. Conversely, pushing the shift lever to the left toward the "-" on the Shift Lever Assembly will downshift one range at a time. This enables the other forward gears to be accessed (engine speed permitting). Also, pushing and holding the shift lever to the left or right will change the transmission gear that is accessed when the shift lever is put into the Drive (C) position.
Also located on the Shift Lever Assembly is the transmission mode switch (W/S). In Standard (S) mode, the vehicle transmission starts off in first gear at all times. In Winter (W) mode, the vehicle transmission starts off in second gear unless manually downshifted and the forward gears have a reduced RPM range. In Winter mode, if transmission kickdown occurs, transmission upshifts and downshifts are the same as Standard mode operation.
OPERATION
The Shift Lever Assembly consists of a printed circuit board, an opti-electronic switch for program selection recognition at the "W/S" program selector, contacts at the shift lever for recognizing the selected shift range, two plugs, and four light emitting diodes (LEDs) to illuminate the shift gate. The shift lever printed circuit board receives digital and analog input signals, controls various components and transfers information to various modules via the Controller Area Network (CAN) bus. The Shift Lever Assembly has input and output signals to the Data Link Connector. The Shift Lever Assembly receives input signals from the selector lever, the W/S switch, the upshift/downshift (+/-) Autostick switch, the shift gate illumination, the kickdown switch, and the brake lamp switch. The Shift Lever Assembly sends output signals to the reverse/park lock and the reverse lamps. A safety mechanism is built into the Shift Lever Assembly to prevent mechanical damage to the automatic transmission. The rear wheel speed is measured through the Controller Antilock Brake (CAB) and delivered to the Shift Lever Assembly. As a result, shifting the selector lever from Neutral to Reverse above approximately 8 km/h (5 MPH) is not allowed.
The ignition lock control cable attached to the Shift Lever Assembly prevents the driver from removing the ignition key if the selector lever is not in the Park position.
Brake Transmission Shift Interlock
BTSI is a safety feature that enables the shift selector lever to stay locked in the Park position when the brake pedal is not depressed (ignition on) or when there is no current present in the Shift Lever Assembly. If the Shift Lever Assembly selector lever cannot be shifted from the Park position due to a mechanical or electrical failure, the selector lever can be released from the Park position using the shift lock override procedure. To do this, insert a long screwdriver into the notch just below the "-D+" symbol on the Shift Lever Assembly and depress the lock button while moving the selector lever out of the Park position at the same time. This will allow the shift lever to be manually moved out of the Park position in order to move the vehicle.