Activating instrument cluster, function - GF54.30-P-2006R

MODEL 230

Networking

Fig 1: Activating Instrument Cluster - Communication Diagram

Courtesy of MERCEDES-BENZ USA

Activating the instrument cluster (A1)

Because it relies on black-screen technology, the details on the instrument cluster (e.g. displays, gauges, etc.) are clearly visible only when the instrument cluster (A1) has been activated.

When the instrument cluster (A1) is activated:

the current contents appear in the displays,
the instrument cluster illumination is switched on and
the fuel reserve warning lamp (A1e4) is actuated.

The instrument cluster (A1) is activated when terminal 15r is switched on . When terminal 15r is switched off, the instrument cluster (A1) remains active for an additional 30 seconds. If an active warning message is displayed, the run-on time is extended to t=2 min.

When terminal 15r is OFF , the instrument cluster (A1) is activated under the following circumstances:

If the instrument illumination dimmer and reset button (A1r1) is actuated (the instrument cluster (A1) is activated for 30 s)
If the driver's door is opened or closed (the instrument cluster (A1) is activated for 30 s)
If the standing lamps or headlamps are switched on (the instrument cluster (A1) remains active for as long as the standing lamps are on)

If one of the above conditions occurs while the instrument cluster (A1) is already active, the instrument cluster remains active for an additional 30 s from this time.

It is not possible to activate the instrument cluster (A1) using the buttons on the multifunction steering wheel.

Networking (see figure after text)

The status of the left door contact switch (S17/3) on lefthand drive vehicles or the right door contact switch (S17/4) on right-hand drive vehicles is read by the rear SAM control module (N10/8) and transmitted as a message on the interior compartment CAN.
The status of the standing lamps (on/off) is transmitted over the interior compartment CAN by the driver-side SAM control module (N10/10).

The instrument cluster (A1) receives these messages and is activated if necessary.

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