Warning Lamps

General: The background lighting of all warning lamp symbols as well as the engaged drive stage for automatic transmission together with the selected drive program is provided by LEDs.

General brake warning lamp: The warning lamp can be switched on by the light check module (LCM) when, for example, the LCM detects the brake fluid level as being too low or the instrument cluster detects that the brake pad sensor loop has a break to ground. The warning lamp is also switched on after ignition ON as a function check (pre-drive check) and goes out when a minimum engine speed of 400 rpm is exceeded.

Seat belt indicator lamp: The seat belt indicator lamp is activated dependent on the coding data. For vehicles without a seat belt buckle contact, it is switched on for approx. 6 seconds after terminal 15 "ON".

On vehicles equipped with a seat belt buckle contact, the warning lamp is switched on as of terminal 15 "ON" by a corresponding K-bus telegram from the light check module (LCM) until the seat belt contact is opened (seat belt buckle locked in position).

Fuel reserve lamp: The fuel reserve warning lamp is not switched by a reserve contact in the level sensor. It is switched dependent on the tank content compared to a reserve threshold value.

The "fuel reserve" signal is output as information for engine management. It is coupled to the fuel reserve warning lamp and is switched on for 2 seconds as a function check when switching on terminal 15 (pre-drive check).

Turn signal indicator lamps: The turn signal indicator lamps are switched by means of a corresponding K-bus telegram from the light check module (LCM) to the instrument cluster.

Fog light indicator lamp: The fog light indicator lamp is switched by means of a corresponding K-bus telegram from the light check module (LCM) to the instrument cluster.

Rear fog light indicator lamp: The rear fog light indicator lamp is switched by
15 is switched on (pre-drive check).
means of a corresponding K-bus telegram from the light check module (LCM) to the instrument cluster.

High beam indicator lamp: The high beam indicator lamp is switched by means of a corresponding K-bus telegram from the light check module (LCM) to the instrument cluster.

Oil level warning lamp: The warning lamp is switched by means of a corresponding K-bus telegram from the light check module (LCM) to the instrument cluster

As a function check, the warning lamp is switched on for 2 seconds when terminal 15 is switched on (pre-drive check).

Air suspension: If coded, the warning lamp is switched by means of a corresponding K-bus telegram from the air suspension control unit (EHC) to the instrument cluster.

If coded, the warning lamp is switched on for 2 seconds as a function check when switching on the terminal 15 (pre-drive check).

Air suspension: .If coded, the warning lamp is switched by means of a corresponding K-bus telegram from the air suspension control unit (EHC) to the instrument cluster.

Transmission fault: If automatic transmission is coded, the warning lamp is switched by means of a corresponding telegram (150 Baud) from the automatic transmission control unit. By way of this data link, the instrument cluster is also informed of the engaged drive stage in order to display the corresponding drive stage.

NOTE: The indicator lamps listed in the following are controlled directly via corresponding connector pins by the relevant system.

Oil pressure indicator lamp: The warning lamp is switched by the oil pressure switch.

Battery charge indicator lamp: The warning lamp is switched by the D+ terminal 61 signal (charge mode approximately system voltage) to the instrument cluster.

Parking brake warning lamp: The warning lamp is activated by a switch on the parking brake. The switch is open when the parking brake is released.

As a function check, the warning lamp is switched on for 2 seconds when terminal

Airbag indicator lamp: The warning lamp is switched by a signal (ground) from the airbag control unit.

Anti lock brake system indicator lamp: The warning lamp is switched by the ABS control unit. Since the warning lamp must light in the case of a signal line failure a second signal input is provided in the instrument cluster for this warning lamp. In the case of this new ABS control unit, this second line must be connected to ground for the ABS warning lamp to light. The new function, signal line high (system voltage) warning lamp active, signal line low (ground) warning lamp off and signal line high (high-ohmic, interrupted) warning lamp active, also takes into account a break in the signal line. The previous junction, signal line high (high-ohmic) warning lamp off and signal line low (ground) warning lamp active is still possible.

Check engine (exhaust gas warning lamp): The warning lamp "check engine" is switched by a signal (ground) from the engine control unit.

Cruise control active indicator: The "cruise control active indicator" is switched by a signal (ground) from the cruise control unit or by the engine control unit for diesel engines.

Check engine (exhaust gas warning lamp): The "ASC" warning lamp is switched by a signal (ground) from the engine control unit. The warning lamp is switched on statically if the ASC is switched off. When the ASC is switched on, the warning lamp goes out after a function check (pre-drive check) and flashes during a control phase.

As a function check, the warning lamp is switched on for 2 seconds when terminal 15 is switched on (pre-drive check)