Headlamp Alignment Control Module: Description and Operation

GF82.10-P-2112G Component Description of Headlamp Range Adjustment Control Unit
MODEL 463.306 /336 /346 up to 31.5.12 as of model year 2011 /YoM 10
MODEL 463.202 /222 /236 /237 up to 31.5.12 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 up to 31.5.12 as of model year 2007





N71 Headlamp range adjustment control unit

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.