Displaying indicator/warning messages via indicator lamps, function

P54.30-2698-05

(Shown on instrument cluster during bulb check)

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 Low brake fluid level/parking brake indicator lamp

A1e9 Seat belt reminder lamp (depending on national variant)

Ale15 Airbag indicator and warning lamp

Ale16 Preglow indicator lamp (on vehicles with diesel engines only)

Ale17 ABS MIL

Ale41 ESP warning lamp

Ale47 BAS/EPS malfunction indicator lamp

A1e58 Engine diagnosis malfunction indicator lamp (or "CHECK ENGINE" MIL A1e26 depending on national variant)

A1p1 ECT gauge

A1p2 Fuel level gauge

A1p4 Outside temperature indicator

A1s4 Button for instrument and search lighting (bright)

A1s5 Button for instrument and search lighting (dark)

p Phototransistor

A1p5 Tachometer

A1p6 Electronic clock

A1p8 Electronic speedometer

A1p12 Gear display

A1p13 Multifunction display

A1s3 Trip odometer reset button

Left and right turn signal indicator lamps (A1e1, A1e2)<f>

These are actuated differently depending on the function:

 Only one of the indicator lamps is always actuated for direction flashing

The signal to actuate the lamp comes from the light module(N7-1) via a discrete line.

If one of the turn signal lamps fails the indicator lamps are actuated at double frequency by the light module(N7-1).

 Both indicator lamps are actuated by light module (N7-1) for warning flashing

 Both indicator lamps are actuated by light module (N7-1) for ATA flashing

 Both indicator lamps are actuated by light module (N7-1) for special function flashing

 Whilst direction flashing is only possible when terminal 15 is ON, other types of flashing are possible with terminal 15 OFF. The audible turn signal indicator (A1h2) sounds in parallel with the flashing frequency.

High beam indicator lamp (A1e3)

This lamp is actuated by the light module (N7-1).

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Fuel reserve indicator lamp (A1e4)

This indicator lamp comes on as soon as the reserve range is reached. It is actuated in close conjunction with the fuel level gauge (A1p2).

For more details, see "Displaying fuel level, function" document.

Low brake fluid level and parking brake indicator lamp (A1e7)

This lamp is actuated if the parking brake is not released while driving or the minimum brake fluid level is not reached.

The signal for actuating the lamp comes

 discrete from the brake fluid level switch (S11) for low brake fluid level

 from the traction systems control module (N47) via the CAN/engine compartment for the <f>parking brake indicator.

Seat belt reminder lamp (A1e9)

This indicator lamp is not available for all national variants.

It comes on when the driver's seat belt buckle is not inserted when the engine is running. In addition a warning tone sounds on many national variants.

The signal for actuating the lamp comes directly from the seat belt buckle switch.

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Airbag indicator and warning lamp (A1e15)

This lamp is actuated when there is a fault in the supplemental restraint system (SRS).

It is actuated directly by the SRS control module (N2/7).

For more details, see "SRS airbag indicator lamp..." document.

Preglow indicator lamp (A1e16)

This indicator lamp is only fitted to vehicles with diesel engines.

It comes on when terminal 15 is On, as long as the preglow time is in progress. The signal to actuate the lamp comes from the injection system control module (N3) via the CAN/engine compartment.

In the event of a defect in the preglow indicator lamp (A1e16) a fault code is set in the instrument cluster (A1) and a corresponding message is sent to the injection system control module (N3) via the CAN/engine compartment. However, there is no fault message in the multifunction display (A1p13).

ABS MIL (A1e17)

This lamp is actuated when there is a fault in the ABS.

The signal to actuate the lamp comes from the <f>traction systems control module (N47) via the CAN/engine compartment.

ASR MIL or ESP warning lamp (A1e22 or A1e41)

The vehicles are either equipped with ASR or ESP. The respective lamp is actuated as soon as the system intervenes in the driving situation.

The signal to actuate the lamp comes from the traction systems control module (N47) via the CAN/engine compartment.

Engine diagnosis malfunction indicator lamp (A1e58) or "CHECK ENGINE" MIL (A1e26)

The vehicles are either equipped with the engine diagnosis malfunction indicator lamp (A1e58) or "CHECK ENGINE" MIL (A1e26)

depending on the national variant.

The lamp is actuated when there is a fault in the injection system, ignition system or exhaust emission system.

The signal to actuate the lamp comes from the injection system control module (N3) via the CAN/engine compartment.

 Apart from the actuations described above, all indicator and warning lamps are also actuated on the bulb test with the exception of:

 Left turn signal indicator lamp (A1e1)

 Right turn signal indicator lamp (A1e2)

 Preglow indicator lamp (A1e16)

 In the case of some indicator and warning lamps (e.g. engine diagnosis malfunction indicator lamp (A1e58), a fault message appears in the multifunction display (A1p13) in parallel with the actuation. Whilst most messages can be acknowledged, the indicator and warning lamps come on as long as there is a fault. Acknowledgement is not possible.