Touchpad, Component Description - GF54.21-P-4511GN

MODEL 166 as of model year 2016 

with CODE 531 (COMAND APS) 

MODEL 292 

with CODE 531 (COMAND APS) 

Shown on model 292, as of 01.06.2016 

Shown on model 292, up to 31.05.2016 

Location 

The touch pad is located on the center console.

Tasks 

The touchpad is the central control for various telematics functions. The touchpad can be used to operate the functions shown on the Audio/COMAND display (A40/8). To this end, the touch pad fulfills the following tasks:

• Touch-sensitive registration of control signals 
• Receiving signals 
• Sending signals 

Touch-sensitive registration of control signals 

The user input (operating gestures, including pressing, and handwriting recognition) is detected by the touch-sensitive user interface and the palm rest is recognized. In addition, the touch pad detects when the following integrated buttons are pressed:

• "Back" button
• Background Audio button (enables operation of the audio source without leaving the current menu)
• Home and Favorites button

Model 166 as of model year 2018

with code 531 (COMAND APS)

Model 292

as of model year 2018

with code 531 (COMAND APS)

When changing from one menu entry to another one, the touchpad provides haptic feedback. This function can be activated and parameterized using the diagnosis tester.

Receiving signals 

The touchpad is connected through the telematics CAN (CAN A) to the vehicle electronics.

For example, the touchpad reads in the following signals over the telematics CAN:

• Terminal 15 status
• On-board electrical system status
• Engine running status
• Terminal 58d
• Wake-up signal
• Control signals from the COMAND controller unit (A40/3)

Sending signals 

The touchpad sends the control signals over the telematics CAN to the COMAND controller unit.

Wiring diagram for touch pad

PE82.00-P-2061-97NBA