Redundant Data Storage - BMW 1999-2005 M3 Service Manual

Electrical System - General
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Other functions are not directly
controlled by the GM V but
interconnected:
Rain sensor (AIC). See
Wipers and Washers.
Sunroof operation (SHD). See
540 Sunroof.
Seat memory (SM) and electrical
operation. See
Outside rear-view mirror control and
heating. See
Bumpers.
Windshield washer jet heating. See
611 Wipers and

Redundant data storage

The following vehicle information is
stored redundantly in the instrument
cluster and the light switch module:
Vehicle identification number (VIN)
Total mileage
Service interval data
This redundancy means that the
instrument cluster or light module may
be replaced without loss of stored data.
The data between the two units is
compared each time the ignition is
switched on (KL 15 on). If the data does
not match the tamper warning dot
(arrow) in the mileage display will be
illuminated. Under certain circumstances
611
520 Seats.
510 Exterior Trim,
Washers.
2/25/2009 11:07 PM