High Beam Assist

General Information

Note

• Familiarity with the function and operation of the headlamp assistance is needed if there are customer concerns.
• Additional information:
  • Refer to Owner's Manual.
  • Refer to Self Study Program; No 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 Assist Control Module -J844- inside the interior rearview mirror control it.

To activate the high beam assist, turn on the ignition, turn the headlamp switch to AUTO and move the turn signal lever to 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
• Other motorists, pedestrians, bicyclists not easily seen
• Narrow curves, on-coming traffic partially covered, steep hills.
• On-coming vehicles on streets with a center barrier, when the driver can see clearly over the barrier, for example, truck drivers
• With a faulty light recognition sensor and interrupted voltage supply.
• Fog, snow and heavy rain
• Dust and sand
• Stone impact in the field of vision for the light recognition sensor.
• The vision range of the sensor is fogged up, dirty or covered by a sticker, snow or ice

Note

Depending on the equipment, the high beam assist can also be performed by the Driver Assistance Systems Front Camera -R242-.

Malfunction Recognition and Malfunction Indicator:

The Automatic High Beam Assist Control Module -J844- is equipped with OBD.

Use the Vehicle Diagnostic Tester in "Guided Fault Finding".

Automatic High Beam Assist Control Module -J844-

Automatic High Beam Assist Control Module -J844-, Removing and Installing

The Automatic High Beam Assist Control Module -J844- is installed inside the interior rearview mirror and cannot be replaced separately. If a failure occurs, the entire interior rearview mirror must be replaced.

• Interior Rearview Mirror, Removing and Installing.
• Code the new automatic high beam assist control module after installing it.

Note

It is not necessary to calibrate the new automatic high beam assist control module. The system automatically calibrates the control module.

Automatic High Beam Assist Control Module -J844-, Coding

Code the new automatic high beam assist control module after installing it.

• Code the Automatic High Beam Assist Control Module -J844- using the Vehicle Diagnostic Tester.

Light Recognition Sensor -G399-

Light Recognition Sensor -G399-, Removing and Installing

The Light Recognition Sensor -G399- is inside the interior rearview mirror base and cannot be replaced separately. If a failure occurs, the entire interior rearview mirror must be replaced.

• Interior Rearview Mirror, Removing and Installing.
• Code the Automatic High Beam Assist Control Module -J844- in the interior rearview mirror after installing the Light Recognition Sensor -G399-.

Note

It is not necessary to calibrate the new light recognition sensor. The system automatically calibrates the control module.