Abs System Inspection - BMW 1999-2005 M3 Service Manual

Suspension, Steering and Brakes — General
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troubleshooting of major ABS
components requires special test
equipment and knowledge and should
be performed by an authorized BMW
dealer.
ABS is self-tested by the control module
each time the car is started. Once the
test is complete, the ABS dashboard
warning light turns off. If the light
remains lit or comes on at any time
during driving, a system fault has
occurred and ABS is electronically
disabled. The conventional braking
system remains fully functioning.
When a system or component failure
occurs in the electronic braking and
stability control systems, either the brake
warning light, ABS warning light, or the
ASC / DSC warning light will
illuminate.Troubleshooting and
diagnosis for the electronic braking and
stability control systems must be made
using an electronic scan tool.
Brake bleeding functions, as well as
component coding and initialization must
be completed using BMW scan tools DIS
or MoDiC.

ABS system inspection

A visual inspection of the ABS system
components may help to locate system
faults. If no visual faults can be found
and the ABS light remains on, have the
system diagnosed by an authorized
BMW dealer.
Carefully inspect the entire ABS wiring
harness, particularly the pulse sensor
harnesses and connectors near each
wheel. Look for chafing or damage due
to incorrectly routed wires.
Carefully remove the wheel speed
sensors. Clean the sensor tips. Inspect
toothed wheel on wheel hub. Check for
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