Display monitoring/warning messages via indicator lamps, function - GF54.30-P-2011S

MODELS 215, 220

Illustration shows instrument cluster during lamp check (valid up to 31.8.02) on model 220

Fig 1: Overview Of Instrument Cluster - Valid Up To 31.8.02 On Model 220

Illustration shows instrument cluster during lamp check (as of 01.9.02) on model 220

Fig 2: Overview Of Instrument Cluster - Valid As Of 01.9.02 On Model 220

Left turn signal indicator lamp (A1e1), right turn signal indicator lamp (A1e2)

These are activated differently according to function:

During operation as directional indicators only one of the indicator lamps is triggered.
The lamp activation signal is transmitted via the interior CAN from the column jacket module (N80).

If one of the turn signal lamps fails, the indicator lamps are triggered at twice the normal frequency. The instrument cluster (A1) receives the information about the defective turn signal lamp from the control unit responsible for activating that particular lamp unit.
When the hazard warning flashers are operated both indicator lamps are triggered. The signal for actuating the lamps comes over the interior CAN from the upper control panel control unit (N72/1).
When the flashers are triggered for the anti-theft alarm system both indicator lamps always flash. The trigger signal for the lamps is received from the left front SAM control unit (N10/6) via the interior CAN.
Both indicator lamps always flash when the lamps are triggered for special functions. The trigger signal for the lamps is received from the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) via the interior CAN.

While turn indication is only possible with "circuit 15 ON", the other types of flashing are also possible with "circuit 15 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:

Flashing for special functions (highest priority)
Flashing for anti-theft alarm system
Hazard warning flashing
Direction indicators (lowest priority)

High beam indicator lamp (A1e3):

This lamp is activated differently according to function:

For high beam ON and the headlamp flasher, the left front SAM control unit (N10/6) sends the signal to switch on the steady light via the interior CAN.
For special functions, such as the emergency alarm, the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) sends the trigger signal for the lights to flash on and off via the interior CAN.

If different requests to turn on the high beam occur at the same time, the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) request has the highest priority.

Fuel reserve warning lamp (A1e4):

This warning lamp comes on as soon as the reserve level is reached. Control of this lamp is linked to the fuel level and reserve indicator (A1p2).

For more information, see document "Display fuel level, function"

Brake fluid level and parking brake warning lamp (A1e7):

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

The left front SAM control unit (N10/6) sends the trigger signal for the lamp via the interior CAN.

Seat belt warning lamp (A1e9) valid up to 31.8.02:

This indicator lamp is not provided in all national markets.

The lamp comes on when the engine is running if one of the front seat belt buckles is not fastened when the seat is occupied. A warning tone (model 220) or gong (model 215) also sounds.

The left front seat adjustment control unit with memory (N32/1) or right front seat adjustment control unit with memory (N32/2) sends the signal to switch on the lamp via the interior CAN.

Seat belt warning lamp (A1e9) valid as of 01.9.02:

The seat belt warning lamp (A1e9) operates in the same way as in vehicles valid up to 31.8.02 except that a gong sounds in both vehicle models.

Airbag indicator and warning lamp (A1e15):

This lamp is triggered to signal malfunctions in the supplemental restraint system (SRS).

It is triggered directly by the restraint systems control unit (N2/7).

Preglow indicator lamp (A1e16) :

This indicator lamp is only fitted in vehicles with a diesel engine.

The lamp comes on with "circuit 15 ON" as long as the preheat time is running. The signal to activate the lamp is sent by the CDI control unit (N3/9) via the engine compartment CAN.

If there is a fault with the preglow indicator lamp (A1e16), an error bit is set in the instrument cluster (A1) and a corresponding message is sent to the CDI control unit (N3/9) via the engine compartment CAN. There is, however, no fault message in the multifunction display (A1p13)!

ABS indicator lamp (A1e17):

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

The signal to activate the lamp is sent by the traction system control unit (N47) via the engine compartment CAN.

ESP warning lamp (A1e41) and ESP indicator lamp (A1e42) valid as of 01.9.02:

The ESP warning lamp (A1e41) is actuated whenever the system intervenes in the driving situation.

The ESP indicator lamp (A1e42) is triggered when there is a fault in the system.

The signal to activate the relevant lamp is sent by the traction system control unit (N47) via the engine compartment CAN.

Engine diagnosis indicator lamp (A1e58) or CHECK ENGINE (A1e26):

The vehicles vary according to national version, and are equipped with either an engine diagnosis indicator lamp (A1e58) or a 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.

The signal for actuating the lamp comes is sent by the CDI control unit (N3/9) or the ME-SFI [ME] control unit (N3/10) via the engine compartment CAN.

DTR warning lamp (A1e59):

This lamp is present only on vehicles equipped with Distronic (DTR) (Code 219a).

It is activated if the vehicle gets too close to the vehicle in front. An acoustic signal also sounds.

The signal to activate the lamp is sent via the engine compartment CAN from the DTR control unit (N63/1).

Tire pressure monitor warning lamp (A1e66)

This lamp is present only on vehicles equipped with tire pressure monitor (Code 475). The lamp lights up yellow in addition to the multifunction display (A1p13) when the system detects rapid pressure loss of ≥ 0.2 bar/min.

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

Light sources

Bulbs are used for the following indicator lamps:

Left turn signal indicator lamp (A1e1)
Right turn signal indicator lamp (A1e2)
High beam indicator lamp (A1e3)
Airbag indicator and warning lamp (A1e15)
Preglow indicator lamp (A1e16)

All other indicator and warning lamps in the instrument cluster (A1) are equipped with light emitting diodes (LED).

In addition to the operation scenarios 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)
Preglow indicator lamp (A1e16)

are also triggered during the lamp test.

Triggering and illumination of some indicator and warning lamps, such as the engine diagnosis indicator lamp (A1e58), is accompanied by the appearance of a malfunction message in the multifunction display (A1p15). 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!

Instrument cluster (IC), location/task

GF54.30-P-3039S