Display monitoring/warning messages via indicator lamps, function

P54.30-8337-09

Up to production period 31.08.2006

A1 Instrument cluster

A1e1 Left turn signal indicator lamp

A1e2 Right turn signal indicator lamp

A1e3 High beam headlamp indicator lamp

A1e4 Fuel reserve indicator lamp

A1e7 Brake fluid and parking brake warning lamp

A1e9 Seat belt warning lamp

A1e15 Airbag indicator and warning lamp

A1p8 Electronic speedometer

A1p13 Multifunction display

A1s3 Trip odometer reset button

A1s4 Instrument and controls illumination button, bright

A1s5 Instrument and controls illumination button, dim

P Phototransistor

A1e16 Preglow indicator lamp

A1e17 ABS indicator lamp

A1e41 ESP warning lamp

A1e58 Engine diagnosis indicator lamp

A1e66 Tire pressure monitor warning lamp

A1p2 Fuel level and reserve indicator

A1p5 Tachograph

A1p6 Electronic clock

P54.30-9430-79

As of production period 01.09.2006

A1 Instrument cluster

A1b1 Brightness sensor

A1e1 Left turn signal indicator lamp

A1e2 Right turn signal indicator lamp

A1e3 High beam headlamp indicator lamp

A1e4 Fuel reserve indicator lamp

A1e7 Brake fluid and parking brake warning lamp

A1e9 Seat belt warning lamp

A1e15 Airbag indicator and warning lamp

A1p6 Electronic clock

A1p8 Electronic speedometer

A1p13 Multifunction display

A1s3 Trip odometer reset button

A1s4 Instrument and controls illumination button, bright

A1s5 Instrument and controls illumination button, dim

A1e16 Preglow indicator lamp

A1e17 ABS indicator lamp

A1e33 LIM (variable speed limiter) function indicator lamp

A1e41 ESP warning lamp

A1e58 Engine diagnosis indicator lamp

A1e59 DTR warning lamp

A1e66 Tire pressure monitor warning lamp

A1p2 Fuel level and reserve indicator

A1p5 Tachograph

Turn signal indicator lamps

As an optical check the left turn signal indicator lamp and right turn signal indicator lamp is integrated in the instrument cluster.
These lamps are activated differently according to function.
When functioning as direction indicators, only one of the two indicator lamps is actuated at a time.
The signal for actuating the respective indicator lamp comes via the CAN interior from the steering column module (N80) to the SAM control unit (N10/8).
If one of the turn signal lamps fails, the triggered indicator lamp flashes at twice the frequency.

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The left turn signal indicator lamp and right turn signal indicator lamp is actuated for hazard warning flashing and ATA flashing. The signal for actuating the lamps as hazard warning flashers comes over the interior compartment CAN from the upper control panel control unit (N72/1).
The signal for actuating the anti-theft alarm system flashing comes from the rear SAM control unit via the interior CAN.

While the direction indicator function is available only with "circuit 15 ON", the other flasher modes are also possible with "circuit 15 OFF". An acoustic signal accompanies the rhythmic flashing of the indicator lamp (A1h2).

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When different demands for flasher operation are present, the system assigns hierarchical priorities in the following sequence:

 Electronic alarm system flashers (highest priority)

 Hazard warning flashers (2nd priority)

 Turn indicators (3rd priority)

High beam indicator lamp

With high beam "ON" and headlamp flasher the actuation takes place via the CAN interior through the front SAM control unit (N10).

Fuel reserve indicator lamp

The fuel reserve warning lamp lights up as soon as the reserve level is reached. The actuation is closely linked to the fuel level and reserve indicator.

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Brake fluid and parking brake warning lamp

This warning lamp is actuated if at the start of a journey the parking brake is not released or the minimal brake fluid level is not reached.

The signal for actuating the lamp comes from the front SAM control unit via the interior CAN.

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Seat belt warning lamp

The seat belt warning lamp is actuated as follows:

 The seat belt warning lamp lights up, if "circuit 61 is ON", the vehicle speed > 25 km/h or 15 mph is and the driver seat belt buckle and seat belt warning switch (S68/1) is not closed. The seat belt warning lamp goes out as soon as the driver seat belt buckle and seat belt warning switch is closed.

 The seat belt warning lamp lights up, if "circuit 61 is ON", the vehicle speed > 25 km/h or 15 mph, the front passenger seat occupied and child seat recognition sensor (B48) has detected a person or a child seat and the front passenger seat belt buckle and seat belt warning switch (S68/2) is not closed. The seat belt warning lamp goes out as soon as the front passenger seat belt buckle and seat belt warning switch is closed

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Safety system lamps

The airbag indicator and warning lamp is actuated when there is a fault in the supplemental restraint system (SRS).
It is triggered directly by the restraint systems control unit (N2/7).

The ABS indicator lamp is actuated if there is a fault in the ABS. The signal for actuating the lamp comes via the CAN engine compartment from the ESP control unit (N47-5).

The signal to actuate the lamp comes from the ME-SFI control unit (N3/10) or CDI control unit (N3/9) via the engine compartment CAN.

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Tire pressure monitor warning lamp

This lamp is present only on vehicles equipped with tire pressure monitor (Code 475).

In addition to the multifunction display it lights up yellow, when a rapid pressure loss of  0.2 bar/min is detected.

The signal to activate the lamp is sent by the TPM [RDK] control unit (N88) via the interior CAN.

DTR warning lamp

This lamp is only fitted to vehicles with Distronic (DTR) code 219.

It lights up in addition to the red multifunction display when a minimum distance previously adjusted by the driver is dropped below.

The signal for actuating the lamp comes from the ESP control unit via the CAN interior.

Light sources

The high beam indicator lamp and the preglow indicator lamp are equipped with bulbs as the means of lighting.
All the other indicator and warning lamps in the instrument cluster are equipped with light emitting diodes (LED).

 Apart from the actuations described above all the indicator and warning lamps are also actuated on the lamp test with the exception of the left turn signal indicator lamp, right turn signal indicator lamp and high beam indicator lamp are also actuated on the lamp test.

 In the case of some indicator and warning lamps, e.g. the ABS indicator lamp, at the same time as the actuation a fault message takes place in the multifunction display. While some categories of message can be acknowledged and canceled, the warning and indicator lamps remain on for as long as the problem remains present. These indications cannot be canceled!