Display monitoring/warning messages via indicator lamps, function

P54.30-8453-09

P Phototransistor

A1 Instrument cluster

A1e1 Left turn signal indicator lamp

A1e2 Right turn signal indicator lamp

A1e3 High beam indicator lamp

A1e4 Fuel reserve indicator lamp

A1e7 Brake fluid and parking brake warning lamp

A1e9 Seat belt warning lamp

A1p1 Coolant temperature display

A1p2 Fuel level and reserve indicator

A1p5 Tachometer

A1p6 Electronic clock

A1p8 Electronic speedometer

A1p12 Gear indicator

A1p13 Multifunction display

A1p16 Transmission mode display

A1r1 Instrument illumination brightness control and reset button

A1e15 Airbag indicator and warning lamp

A1e17 ABS indicator lamp

A1e41 ESP and ABS warning lamp

A1e54 Coolant temperature warning lamp

A1e58 Engine diagnosis indicator lamp

A1e59 DTR warning lamp

A1e66 Tire pressure monitor warning lamp

A1e67 Low beam indicator lamp

Turn signal indicator lamps

The left turn signal indicator lamp and the right turn signal indicator lamp are integrated into the instrument cluster to provide a visual check. These are activated differently according to function.

If one of the turn signal lamps fails, the triggered indicator lamp flashes at twice the frequency.

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When functioning as hazard warning flashers and anti-theft alarm system (ATA [EDW]) flashers, the left turn signal indicator lamp and the right turn signal indicator lamp are actuated simultaneously.

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 While direction signaling is only possible when terminal 15 is switched ON, the other types of turn signal modes are also possible when terminal 15 is switched OFF. An acoustic signal accompanies the rhythmic flashing of the indicator lamp (A1h2).

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)

 The turn signal confirmation when the vehicle is opened or closed is handled in the same way as the hazard warning flashers.

High beam indicator lamp

The high beam indicator lamp is actuated with high beam "ON" and headlamp flasher "ON".

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Low beam indicator lamp

With low beam "ON", the low beam indicator lamp is actuated.

Fuel reserve indicator lamp

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

Brake fluid and parking brake warning lamp

This warning lamp is actuated at the start of a journey if the brake fluid level is below the minimum level. The warning lamp remains lit until the parking brake is released.

 In  is located the symbol "Brake" instead off "(!)" In the instrument cluster.

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Seat belt warning lamp

The seat belt warning lamp is actuated as follows:

 The seat belt warning lamp lights up when the circuit status is "Circuit 61 ON", the vehicle speed is >25 km/h and the driver seat belt buckle restraint systems switch (S68/3) is not closed. The seat belt warning lamp goes out as soon as the driver seat belt buckle restraint systems switch is closed.

 The seat belt warning lamp lights up when the circuit status is "circuit 61 ON", the vehicle speed is >25 km/h, 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 restraint systems switch (S68/4) is not closed. The seat belt warning lamp goes out as soon as the front passenger seat belt buckle restraint systems switch is closed.

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 On USA vehicles, seat occupation is detected by the WSS (Weight Sensing System) control unit (N2/13).

Safety system lamps

The airbag indicator and warning lamp is actuated when there is a fault in the supplemental restraint system (SRS). It is actuated directly by the restraint systems control unit (N2/7) over a discrete line. The ABS indicator lamp is actuated when there is a fault in the antilock brake system (ABS). Depending on the national version, vehicles are equipped with either the engine diagnosis indicator lamp or the CHECK ENGINE indicator lamp (A1e26). The lamp is activated if there is a fault in the injection system, the ignition system or the exhaust system.

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DTR warning lamp

If the following distance is dropped below the DTR warning lamp lights up red. An acoustic signal also sounds.

Light sources

The high beam indicator lamp and the low beam indicator lamp (as of 1.6.05) are fitted with bulbs. All other indicator and warning lamps in the instrument cluster are fitted with light emitting diodes (LEDs).

Tire pressure monitor warning lamp

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

 Apart from the actuations described above all the indicator and warning lamps are also actuated on the lamp test with the following exceptions:

 Left and right turn signal indicator lamp

 High beam indicator lamp

 Preglow indicator lamp (A1e16) (diesel)

 Seat belt warning lamp

 The actuation of some indicator and warning lamps, e.g. the engine diagnosis indicator lamp, is accompanied by the appearance of a warning message 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. Messages cannot be acknowledged.