Description

External Controls

OPERATION

NOTE:
Refer to Automatic Transmission for electrical Control Diagram

Transmission Control Switch (TCS)
Rotation of the TCS (transmission control switch) to any of the five positions is sensed by the TCM (transmission control module) and the Gear Shift Module (GSM) via the high speed CAN (controller area network). The TCM (transmission control module) and the GSM react according to the selected position if all parameters for that selection are met.
The TCS (transmission control switch) has a magnetic system using Hall effect sensors to determine the position of the switch. The 'S' (Sport) position selection allows the TCM (transmission control module) to operate the transmission as a semi-automatic 'CommandShift' system. Gear selections are sensed by the TCM (transmission control module) when the driver operates the steering wheel paddle switches. Once the TCS (transmission control switch) position is confirmed, the GSM to rotates the transmission selector shaft (if required) and outputs applicable information on the high speed CAN (controller area network) which is received by the TCM (transmission control module) to activate the correct gear and to instrument cluster to display the selected mode or gear in the instrument cluster message center.
The paddle switches can be used on a temporary basis when the TCS (transmission control switch) is in the 'D' position to override the automatic gear selection if required.

Paddle Switches
The paddle switches are hardwired to the speed control switch on the steering wheel. Operation of a paddle switch completes a ground path to the speed control switch. The speed control switch converts the completed ground signal into a LIN (local interconnect network) signal which is passed via the clockspring and the steering wheel module to the CJB (central junction box). The CJB (central junction box) converts the signal into a high speed CAN (controller area network) signal to the TCM (transmission control module).
Pulling the LH (left-hand) downshift (-) paddle switch provides down changes and pulling the RH (right-hand) upshift (+) paddle switch provides up changes. The first operation of either paddle switch, after 'S' sport mode is selected, puts the transmission into permanent manual CommandShift. Rotation of the TCS (transmission control switch) back to the 'D' position returns the transmission to conventional automatic operation.
Temporary operation of CommandShift mode can also be operated with the TCS (transmission control switch) in the 'D' position. Operation of either the upshift or downshift paddle switches activates the manual CommandShift mode operation. If the TCS (transmission control switch) is in 'D', CommandShift will cancel after a time period or can be cancelled by pressing and holding the upshift (+) paddle switch for approximately 2 seconds.

Neutral and Park Shift Lock
The shiftlock strategy is controlled by the GSM. Shiftlock is activated when the TCS (transmission control switch) is in 'P' or 'N' and the engine is not running.
The shift lock is a requirement for the TCS (transmission control switch). The switch is always locked at ignition on when the engine is not running, except after an engine stall when the selector is not in 'P' (Park) or 'N' (Neutral). If, when driving with the TCS (transmission control switch) in 'S', 'D' or 'R' at a speed of more than 10 km/h (6 mph), the driver selects 'P' or 'N' without the brake pedal depressed, the TCS (transmission control switch) will be immediately locked once the vehicle speed falls to below 10 km/h (6 mph).
With the brake pedal pressed, the TCS (transmission control switch) will remain unlocked for as long as the brake pedal remains pressed, regardless of vehicle speed. The transmission will only engage the Park once the vehicle speed is less than 10 km/h (6 mph). If the driver selects 'N' and releases the brake pedal with a vehicle speed of less than 10 km/h (6 mph), the TCS (transmission control switch) will be locked 2 seconds after 'N' is selected. The TCS (transmission control switch) will remain locked until the driver presses the brake pedal again.

DESCRIPTION

Transmission Control Switch (TCS)
The TCS (transmission control switch) is a rotary switch installed in the floor console and controls the driver transmission selections.
The TCM (transmission control module) and the GSM allow the transmission to be operated as a conventional automatic unit by selecting P R N D on the TCS (transmission control switch). Rotation of the TCS (transmission control switch) allows the selection of P R N D S. Depressing and rotating the TCS (transmission control switch) clockwise from the D position, S mode can be selected. The TCS (transmission control switch) is a fully electronic rotary transmission switch with no mechanical connection to the transmission. Mechanical operation of the transmission corresponding to selections made on the TCS (transmission control switch) is performed by a Gear Shift Module (GSM), located above the TCM (transmission control module) on the transmission casing.
For additional information, refer to Transmission Description Locations
The TCS (transmission control switch) rises from its console once the engine is running. When the engine is stopped with the TCS (transmission control switch) in any position other than N, it retracts into the console again. If the TCS (transmission control switch) is in position N when the engine is stopped, it remains in the raised position for up to 10 minutes, for use in a drive-through car wash for example. After 10 minutes the TCS (transmission control switch) automatically retracts. The TCS (transmission control switch) also retracts if P is selected within the 10 minute period. If the TCS (transmission control switch) does not rise from the console when the engine is started, but electrical power is supplied to the TCS (transmission control switch), the retracted
TCS (transmission control switch) can still be rotated to make selections.
If electrical power to the TCS (transmission control switch) is lost, the TCS (transmission control switch) will not rise from the console when the engine is started and the retracted TCS (transmission control switch) cannot be rotated. The TCS (transmission control switch) contains an internal interlock solenoid to prevent the switch from being rotated when the engine is not running.
The engine can be stopped with the TCS (transmission control switch) in any position. Once the engine is stopped the switch will automatically reset to the P position and the transmission Park lock will be engaged, except if the TCS (transmission control switch) is in the N position when the engine is stopped.
LED (light emitting diode)'s on the TCS (transmission control switch) illuminate to display the selected position. If the brake pedal is not depressed when a selection is made, the selected position LED (light emitting diode) flashes and the mode selection is not performed.

Paddle Switches
Two gear change paddle switches are fitted at the rear of the steering wheel and allow the driver to operate the transmission as a semi-automatic manual transmission using the CommandShift feature. Each paddle switch has three connections; ground, illumination PWM (pulse width modulation) supply and ground switch signal.
The LH (left-hand) paddle switch (-) controls the downshifts and the RH (right-hand) paddles switch (+) controls the upshifts.

Emergency Park Release
The 'shift by wire' system has no mechanical provision to remove the vehicle from Park in the event of a system fault. A service mode is available which allows the TCS (transmission control switch) to rise without the engine running to allow selection of Neutral when a fault condition exists.
The following procedure will initiate the service mode:
- Put the ignition on (power mode 6).
- Hold one of the paddle switches and depress the brake pedal continually for 10 seconds. Service mode is now active and the TCS (transmission control switch) will rise from the console.
- Service mode will remain active until the ignition is off or the engine is started.
If there is a system power failure and the service mode cannot be activated, the GSM must be removed and the transmission selector shaft manually rotated to the Neutral 'N' position. Refer to the relevant service repair procedure for access details.