Interior Lights - BMW 1999-2005 M3 Service Manual

Lights
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Interior Lights

The ZKE V general module (GM V)
controls the interior lighting
automatically using input from several
monitors. The lighting can also be
manually controlled.
Each door lock actuator contains a hall
effect sensor for the purpose of
monitoring door open/closed status.
The hall effect sensor is located
directly behind the rotary latch plate
encased in the lock actuator. The
sensor is activated by the rotary latch
plate position.
Door closed: Rotary latch plate in
latched position. Current flow
through hall sensor <5 mA.
Door open: Rotary latch plate in
open position. Current flow
through hall sensor >12 mA.
A change in current flow informs the
GM V when a door is opened or closed.
The overhead front seat interior/map
light unit contains a single main interior
light. The light is controlled by the GM
V automatically or by momentarily
pressing the interior light switch
located on the light assembly. The
switch provides a momentary ground
signal that the GM V recognizes as a
request to either turn the light on (if off)
or turn the light off (if on).
If the switch is held for more than 3
seconds, the GM V interprets the
continuous ground signal as a request
to turn the interior light circuit off
(workshop mode). Workshop mode is
stored in memory: Even if the GM V is
removed from the power supply and
reconnected, the lights do not come
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2/25/2009 11:15 PM