Transmission Control Switch (TCS)
| ITEM | DESCRIPTION |
|---|---|
| 1 | Lever |
| 2 | Unlock switch |
| 3 | Park (P) switch |
| 4 | Light Emitting Diode (LED) display |
| 5 | Electrical connector |
The Transmission Control Switch (TCS) is a linear selector installed in the top of the floor console. It is secured with 4 screws and has 1 electrical connector for all electrical inputs and outputs.
The TCS is connected on the High Speed (HS) Controller Area Network (CAN) powertrain systems bus to the Transmission Control Module (TCM) and other system modules. The TCS receives a permanent fused battery supply via the Battery Junction Box (BJB) and the Engine Junction Box (EJB). The ignition supply is received via the ignition relay in the Body Control Module/Gateway Module (BCM/GWM). The TCS outputs a Park (P)/Neutral (N) signal on a hardwired connection to the Powertrain Control Module (PCM) and the BCM/GWM. It also receives a hardwired park engaged signal from the TCM.
By selecting 'P', Reverse (R), 'N', Drive (D) or Sport (S) on the TCS, the transmission functions as any conventional automatic unit.
Movement of the TCS to any of the 4 positions or operation of the 'P' switch is sensed by the TCS. The sensed position is passed to the TCM via the HS CAN powertrain systems bus. The TCM then reacts according to the new selection request made by the driver. The linear movement of the TCS is sensed by a magnetic system using multiple Hall effect sensors to determine the position of the selector.
The 'S' position selection allows the TCM to operate the transmission using the semi-automatic command shift. Gear selections are sensed by the TCM when the driver operates the steering wheel paddle switches or moves the TCS to the '+' or '-' positions. The TCS allows the driver to operate the transmission similar to a sequential transmission. Once the TCS position is confirmed, the TCM outputs appropriate information on the HS CAN powertrain systems bus. These signals are received by the Instrument Cluster (IC) to display the gear selection information in the message center.
The paddle switches can also be used on a temporary basis when the TCS is in the 'D' position to override the automatic gear selection if required.