Displaying Check/Warning Messages Via Indicator Lamps, Function

Displaying Check/Warning Messages Via indicator Lamps, Function







Left (A1e1) and right (A1e2) turn signal indicator lamps
These are activated differently according to function:
- When functioning as direction indicators, only one of the indicator lamps is actuated at a time. The signal for actuating the lamp comes over the interior compartment CAN from the steering column module (N80). If one of the turn signals fails, the indicator lamps are actuated at twice the normal frequency. The instrument cluster (A1) receives the information about the defective turn signal from the control module that actuates the defective turn signal.
- When functioning as hazard warning flashers, both indicator lamps are actuated together. The signal for actuating the lamps comes over the interior compartment CAN from the lower control panel control module (N72).
- When functioning as ATA alarm flashers, both indicator lamps are actuated together. The signal for actuating the lamps comes over the interior compartment CAN from the driver-side SAM control module (N10/10).

NOTE:
- While the direction indicator function is available only with terminal 15 ON, the other flasher modes are also possible with terminal 15 OFF.
- The audible turn signal indicator (A1h2) ticks in time with the flash frequency.

When different demands for flasher operation are present, the system assigns priorities in the following sequence:
- ATA alarm system flashers (highest priority)
- Direction indicators and hazard warning flashers (lowest priority)

NOTE: Priorities for turn signal and hazard flasher operation are assigned by the steering column module (N80), with the hazard warning flashers assuming a higher priority than the turn signals.

High beam indicator lamp (A1e3)
- The high beam ON and headlamp flasher are actuated over the interior compartment CAN by the driver-side SAM control module (N10/10).

Fuel reserve warning lamp (A1e4)
This warning lamp lights up as soon as the reserve level is reached. Its actuation is closely linked to the fuel level and reserve gauge (A1p2).
For further details, refer to "Displaying fuel level, function".

Brake fluid and parking brake warning lamp (A1e7)
This lamp is actuated when the parking brake is not released while driving or when the brake fluid level drops below the minimum level.
The signal for actuating the lamp comes over the interior compartment CAN from the driver-side SAM control module (N10/10).

Seat belt warning lamp (A1e9)
This indicator lamp is not available in all national versions.

Version Warning lamp Acoustic warning signal
ECE t = 6 sfrom engine start
USA t = 6 s from engine start t = 6 s from engine start
Japan t = 6 s from terminal 15 ON t = 6 s from terminal 15 ON

The seat belt warning lamp (A1e9) always lights up for t = 6 s. The status of the driver's side seat belt buckle (engaged or open) is irrelevant (all).

The acoustic warning signal sounds for t = 6s.
It stops sooner if the seat belt buckle on the driver's side is engaged (USA, Japan).

NOTE: None of the national versions monitors the status of the seat belt buckle on the front passenger's side.

The signal for actuating the lamp comes over the interior compartment CAN from the left front seat adjustment control module with memory (N32/1).

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 restraint systems control module (N2/7).
For further details, refer to "SRS airbag indicator lamp ..."

ABS indicator lamp (A1e17)
This lamp is actuated when there is a fault in the ABS system. The signal for actuating the lamp comes over the engine compartment CAN from the ESP, SPS and BAS control module (N47-5).

ESP and ABS warning lamp (A1e41)
This lamp is actuated whenever the system intervenes in the driving situation.
The signal for actuating the lamp comes over the engine compartment CAN from the ESP, SPS and BAS control module (N47-5).

Engine diagnosis indicator lamp (A1e58) or CHECK ENGINE malfunction indicator lamp (A1e26)
Depending on the national version, vehicles are equipped with either the engine diagnosis indicator lamp (A1e58) or the CHECK ENGINE malfunction indicator lamp (A1e26).
The lamp is actuated when there is a fault in the injection system, the ignition system or the exhaust system.

The signal for actuating the lamp comes over the engine compartment CAN from the ME-SFI control module (N3/10).

DTP warning and indicator lamp (A1e59)
This lamp is present only in vehicles with Distronic (code 219a). It lights up white when the system detects a preceding vehicle. It switches to red when the distance to this vehicle falls below the safety margin. An acoustic signal also sounds.

The signal for actuating the lamp comes over the engine compartment CAN from the DTR control module (N63/1).

Light sources
The light sources employed for the indicator lamps are bulbs. All indicator and warning lamps in the instrument cluster (A1) are equipped with light emitting diodes (LEDs).

NOTE:
- In addition to the actuations described above, all of the indicator and warning lamps with the exception of the
- left turn signal indicator lamp (A1e1),
- right turn signal indicator lamp (A1e2)
- high beam indicator lamp (A1e3)
are also actuated during the lamp test.
- The actuation of some indicator and warning lamps (e.g the engine diagnosis indicator lamp A1e58) is accompanied by the appearance of a fault message in the right multifunction display (A1p15). While some categories of message can be acknowledged and canceled, the warning and indicator lamps remain lit for as long as the fault remains present. These indications cannot be canceled!