GF54.30-P-0002FL Instrument Cluster (IC), Function

GF54.30-P-0002FL Instrument Cluster (IC), Function

Instrument cluster (A1), general
The instrument cluster notifies the driver of all dynamic and static driving conditions as well as about the current condition of the systems installed in the vehicle.

In the event of faulty vehicle functions or functions relevant to safety, corresponding warnings are issued via the IC.

The following displays are incorporated in the instrument cluster in order to be able to convey information to the driver:
- Permanent displays (e.g. vehicle speed, rotational speed, tank contents)
- Indicator lamps (green, yellow or blue) (e.g. turn signals, high beams)
- Warning lamps (red) (e.g. coolant level, brake fluid level)
- Multifunction display (A1p13) (e.g. outside temperature indicator, display travel distance)

The instrument cluster makes the following functions possible:
^ Activate instrument cluster function sequence
^ Function sequence for indicator lamp test

The following functions are also possible; they are described in separate documents:
^ control/warning messages, function
^ Display operating conditions, function
^ Comfort displays, function Trip computer, function
^ Settings on workshop level, function

Activate instrument cluster function sequence
For the following events the background illumination of the multifunction display in the instrument cluster is activated:
- Unlock the vehicle with the transmitter key (A8/1)
- Open or close driver door
- Change of status "Transmitter key inserted"

The following events activate the background illumination of the multifunction display and the scale illumination of the instrument cluster:
- Standing lights on or
- Circuit 15R ON

After switching off circuit 15R, the instrument cluster remains active for t = 40 s. If a fault exists this time is increased to t = 120 s.

Additional function requirements for indicator lamp test
^ Circuit 15 ON

Indicator lamp test function sequence
The indicator lamp test serves the function test of certain warning lamps and indicator lamps in the instrument cluster.
The instrument cluster carries out this test automatically each time circuit 15 is switched on. The electronic ignition lock control unit makes available the circuit status of circuit 15 (N73) on the chassis CAN (CAN E).

The function of the following warning and indicator lamps is checked during the indicator lamp test:
- Fuel reserve warning light (A1e4)
- Brake fluid and parking brake warning lamp (A1e7)
- Seat belt warning lamp (A1e9)
- Supplemental restraint system indicator lamp (A1e15)
- Antilock brake system indicator lamp (A1e17)
- ESP(R)/ASR OFF warning lamp (A1e32)
- Electronic Stability Program warning lamp (A1e41)
- ESP SPORT indicator lamp (A1e46) (model 212.077/277)
- Coolant temperature warning lamp (A1e54)
- Engine diagnosis indicator lamp (A1e58)
- DISTRONIC warning lamp(A1e59) (with code (233) DISTRONIC PLUS)
- Tire pressure monitor warning lamp (A1e66) (with code (475) Tire pressure monitor (Premium))

The indicator lamp test terminates when the engine is started (circuit 61 ON).

The function of the following indicator lamps is not checked:
- Left turn signal indicator lamp (A1e1)
- Right turn signal indicator lamp (A1e2)
- High beam indicator lamp (A1e3)
- Preglow indicator lamp (A1e16) (on diesel engine)
- Rear fog light indicator lamp (A1e18)
- Fog lamps indicator lamp (A1e57)
- Low beam indicator lamp (A1e67)