Component description of headlamp range adjustment control unit - GF82.10-P-2112G

MODEL 463.306 /336 /346 as of model year 2011 /YoM 10

MODEL 463.202 /222 /236 /237 as of model year 2009 /YoM 08

MODEL 463.247 /248 /249 /254 up to 31.8.08 as of model year 2007

MODEL 463.270 /271 /303 /340 /341 as of model year 2007

Fig 1: Locating Headlamp Range Adjustment Control Unit

Courtesy of MERCEDES-BENZ USA

Location

The headlamp range adjustment control unit is located on the center tunnel.

Tasks

Actuation of automatic headlamp range adjustment (HRA [LWR])
Signal acquisition of the front axle sensor (headlamp range adjustment) (A52) and the headlamp range adjustment rear axle sensor (A51)
Actuation of left headlamp range adjustment motor (E1m1) and the right headlamp range adjustment motor (E2m1)
The headlamp range adjustment control unit is also used as a fault memory

Function

In order to correct the headlamp range of the vehicle headlamps, the headlamp range adjustment control unit evaluates the data of the headlamp range adjustment rear axle sensor and the front axle sensor (headlamp range adjustment).

The headlamp range adjustment motors are then actuated in accordance with the data.

Discrete inputs

Circuit 15
Circuit 31
Front axle sensor (headlamp range adjustment)
Headlamp range adjustment rear axle sensor

Discrete output

Left headlamp range adjustment motor
Right headlamp range adjustment motor

CAN signals

The headlamp range adjustment control unit is a subscriber of the drive train CAN.