(Upper Control Panel Control Unit, Component Description - GF54.21-P-6040GR)

Model 166 

up to Model year 2016 

Courtesy of MERCEDES-BENZ USA

Shows Model 166.0 

Location 

The upper control panel control unit is located on the center console.

Task 

The upper control panel control unit performs the following tasks:

• Reading in of signals 
• Transmitting signals 

Reading in of signals 

The upper control panel control unit reads in the requests for function feedback over the Battery sensor LIN (LIN B15). These are then transmitted by the SAM control unit (N10).

Feedback on the activity of the following functions is provided by the corresponding light-emitting diodes in the buttons on the upper control panel control unit's controls:

• Anti-theft alarm system (ATA) (with CODE 551 (Anti-theft alarm system (ATA)))
• Parking system (with CODE 220 (PARKTRONIC) or CODE 235 (Active Parking Assist))
• Front seat heater (with CODE 873 (Seat heater for left and right front seat) or CODE 401 (Front comfort seats, incl. seat heating and seat ventilation))
• Front seat ventilation (with CODE 401 (Front comfort seats, incl. seat heating and seat ventilation))
• Stationary heater (with CODE 228 Stationary heater)
• ECO start/stop function (with CODE B03 (ECO start/stop function))

Transmitting signals 

The upper control panel control unit sends the function requests for the following buttons over the battery sensor LIN to the front SAM control unit:

• ESP OFF button
• Parking system button (with CODE 220 (PARKTRONIC) or CODE 235 (Active Parking Assist))
• Left front seat heater button (with CODE 873 (Left front and right seat heater) or CODE 401 (Front comfort seats, incl. seat heating and seat ventilation))
• Right front seat heater button (with CODE 873 (Left front and right seat heater) or CODE 401 (Front comfort seats, incl. seat heating and seat ventilation))
• Left front seat ventilation button (with CODE 401 (Front comfort seats incl. seat heating and seat ventilation))
• Right front seat ventilation button (with CODE 401 (Front comfort seats incl. seat heating and seat ventilation))
• Stationary heater button (with CODE 228 Stationary heater)
• ECO start/stop function button (with code B03 (ECO start/stop function))