MB-Info and telediagnosis button group, component description - GF82.95-P-3213SXU

MODEL 221.0/1 with CODE (494) USA version up to Model Year 8

MODEL 221.0/1 with CODE (389) Mobile phone preinstallation with universal interface, USA/Canada up to Model Year 8

MODEL 216.3 with CODE (494) USA version up to Model Year 8

Illustrated on model 221

Fig 1: Identifying MB-Info And Telediagnosis Button Group Components - Illustrated On Model 221

Courtesy of MERCEDES-BENZ USA

Location

The MB-Info and telediagnosis button group with the integrated MB-Info button and the integrated telediagnosis button is located in the center console at the right of the UPCI [UHI] portable CTEL holder (Universal Handy Interface) (A34/15).

Design

Basically, the MB-Info and telediagnosis button group with the integrated MB-Info button and the integrated telediagnosis button consists of the following:

2 integrated light emitting diodes (LED) for the night illumination (circuit 58d)
2 integrated LEDs for display of the operating conditions (telediagnosis and MB-Info)
The MB-Info button and the telediagnosis button are each equipped with a control resistor connected in parallel to the switch contact

Task

The MB-Info and telediagnosis button group with the integrated MB-Info button and the integrated telediagnosis button can be used - depending on the direction of actuation - to trigger either a telediagnosis call or an MB-Info call. In addition, the respective operating condition is indicated to the driver by means of the 2 integrated LEDs.

Function

In quiescent position, an electrical current flows over the control resistors installed in the MB-Info and telediagnosis button group with the integrated MB-Info button and the integrated telediagnosis button (connected in parallel to the switch contact). The emergency call system control unit (N123/4) thus knows that the voltage supply lines and the ground line are OK. When the MB-Info button or the telediagnosis button is pressed, the respective control resistance is bridged by the respective switch contact.

The MB-Info and telediagnosis button group with the integrated MB-Info button and the integrated telediagnosis button is read in over 4 discrete lines by the emergency call system control unit. When the MB-Info button or the telediagnosis button is pressed, the emergency call system control unit transmits the corresponding request. The emergency call system control unit then actuates the respective LED for the triggered function to provide the driver with a visual feedback.