General Information

General Information

• Familiarity with the function and operation of the high beam assist is essential when addressing complaints.

• Additional information:

• => Owner's Manual

• 434 Headlamp assistant

The high beam assist turns the high beams on and off automatically depending on the surrounding traffic conditions and the vehicle speed. The light recognition sensor (G399) inside the rearview mirror base and the automatic high beam control module (J844) inside the interior rearview mirror control it.

Turn on the high beam assistant:

• Ignition switched on

• Turn the headlamp switch (E1) to the AUTO position

• Tilt the turn signal lever into the high beam position

The high beam assist will switch off when the ignition is turned off.

The high beam assist may not switch off at the right time or not at all under the following conditions:

• On poorly lit streets with street signs that are highly reflective

• For other motorists, pedestrians, and bicyclists that are not easily seen.

• Narrow curves, on-coming traffic partially covered, steep hills

• For on-coming vehicles on streets with a center barrier, when the driver can see clearly over the barrier, for example, truck drivers.

• For faulty high beam assistants.

• Fog, snow and heavy rain

• Dust and sand

• Stone chip in the vision range for the light recognition sensor (G399).

• The vision range of the light recognition sensor (G399) is fogged up, dirty or covered by a sticker, snow or ice.

DTC recognition and display

The high beam assist has OBD.

Use the (Vehicle diagnostic tester) under "Guided Fault Finding".