Touchpad, Component Description - GF54.21-P-4511RR
Model 190
With Code 446 (Touchpad only)
Model 190
With Code 448 (Touchpad)
With Code 520 (Audio 20 USB)
Model 190
With Code 531 (COMAND APS)
Shown On Model 190.3 With Code 446 (Touchpad only)
Shown except for code 446 (Touchpad Only)
Location
The touch pad is located on the center console.
Tasks
The touchpad is the central control element for the telematics functions. The touch pad 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)
- Favorites button
When changing from one menu entry to another one, the touchpad provides haptic feedback. These functions can be activated and parameterized using the diagnosis tester.
Receiving signals
For example, the touchpad reads in the following signals over the telematics CAN (CAN A):
- Wake-up signal
- On-board electrical system status
- Terminal status of terminal 15
- Engine running status
- Terminal 58d
- Control signals from the head unit (A26/17)
With code 446 (Touchpad only), the touchpad reads in the operation signals of the right lower control panel (N72/5) via the Drive Unit control unit (N145/1) and audio LIN (LIN A4).
Sending signals
The touchpad sends the operation signals over the telematics CAN to the head unit.
With code 446 (Touchpad only), the touchpad transmits control signals from the head unit to the Drive Unit control unit via the audio LIN.
Structure
The touch pad features a touch-sensitive operating surface and three integrated buttons.
Variants
The size varies depending on equipment installed. The larger variant with code 446 (Touchpad only) is installed without Audio/COMAND control panel (A40/9).
| Wiring diagram for front central operating unit | PE82.00-P-2060-97HBA |