seat BMW X5 1999 E53 Central Body Electronics User Guide

STEERING COLUMN OPERATION
The adjustable steering column is similar to the E38 in components, mechan-
ical linkages and electrical operation. The steering column adjusting switch is
mounted on the left side of the steering column and provides for four directions
of column movement.
The motors for tilt and length also employ ripple counter modules for motor control and
memory recall. The control electronics for the steering column are integrated into the seat
module. The steering column switch inputs are processed by the seat module and the out-
put signals are sent to the steering column ripple counter modules for motor activation.
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RIPPLE
COUNTER

GENERAL FUNCTIONS OF ZKE III
CONSUMER CUT OFF
The interior lights are connected to the consumer cut out circuit. These consumers are con-
nected to KL 30 and can remain on if one of the control switches are left on. This would
prevent the ZKE from going into the sleep mode. However, the consumer cut off will switch
Kl 30, to the interior lighting, off after 16 minutes.
OVERLOAD PROTECTION
The seat and steering column motors are provided operating power through the consumer
cutoff / overload protection relay module as on the E38. The consumer cutoff signal from
the GM signals the relay to maintain operating power to the consumers.
If an overload condition exists, the relay module detects the increase in amperage and
opens the relay. The relay module is located in the electrical carrier forward of the glove
box.
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