BMW 3 (E46). Manual - part 275
angle changes.
LWR monitors vehicle load via two hall
effect sensors mounted to the front and
rear suspension members. When an
adjustment to the angle of the headlight
beams is necessary, LWR
simultaneously activates two stepper
motors (one in each headlight
assembly). The stepper motors drive a
threaded rod that moves the lower edge
of the headlight carrier plates. The
pivoting movement adjusts the vertical
position of the headlight beams.
At each axle of the vehicle, the LWR
sensor (A) is mounted to a fixed point on
the suspension subframe. A lever (B) is
connected to the moving suspension
member. The sensor output voltage
changes as the suspension moves up
and down.
All LWR diagnosis is accessed through
the light control module.
Note:
LWR is not available with standard
halogen headlights.
Headlight vertical aim
system components
1
-
Bolt M5
2
-
Right front ride
height sensor
mounting
bracket
3
-
Self-locking nut
M6
4
-
Front ride
height sensor