E32/E34 ABS/ASC diagnosis via blink (light) code

[shogun]

Push brake pedal and the switch for ASC at the same time and keep it pushed down.
Switch ignition on
Release brake pedal and ASC switch
ASC light starts blinking
BC = blinking Code

BC1 x(=times) blinking - no fault
BC2 x blinking - EMS fault
BC3 x blinking- Motronic fault
BC4 x blinking - RPM sensor (sender)(ABS-Sensor) fault rear left
BC5 x blinking - RPM sensor (ABS-Sensor) fault rear right
BC6 x blinking - RPM sensor (ABS-Sensor) fault front right
BC7 x blinking - RPM sensor (ABS-Sensor) fault front left
BC8 x blinking - ABS-solenoid valve (Hydroaggregate) rear left
BC9 x blinking - ABS-solenoid valve (Hydroaggregate) rear right
BC10 x blinking - ABS-solenoid valve (Hydroaggregate) front right
BC11 x blinking - ABS-solenoid valve (Hydroaggregate) front left
BC12 x blinking - ASR-Plunger valve fault rear left
BC13 x blinking - ASR-Plunger valve fault rear right
BC14 x blinking - valve relais fault
BC15 x blinking - return feed pump fault
BC16 x blinking - storage load valve fault (in German Speicherladeventil)
BC17 x blinking - pressure control
BC18 x blinking - Leakage fault, for example das pressure container empty
BC19 x blinking - pressure fault
BC20 x blinking - influence on transmission, wiring fault
BC21 x blinking - ABS/ASR-control units fault
BC22 x blinking - TD-signal fault ( very often the speed signal)
BC23 x blinking - Option pin wiring fault




To BC 22:
TD Signal fault
control unit terminal 55
ignition off
remove plugs from ABS/ASR-control unit and Motronic-control unit on the left bank (M70)
Check wiring from ABS/ASR-control unit terminal 55 to Motronic- control terminal 6 for broken wires, /Plus-/and ground connection to be checked.
In case you find no fault, read fault codes from MOTRONIC unit/ECU
In case no faults on MOTRONIC: change ABS/ARS control unit.


Translated by me from German language instruction on 7-Forum. I have not checked it and cannot guarantee for correct translation.
Please test at your own and your own risk.
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If anything not correct or to add, pls feel free to do so.

[BillionPa]

holy crap that is awesome.

did you hear the trick about holding down the ASC disable button till the light blinks to disable ASC while leaving ABS active?

[shogun]

many years ago we posted this, but what is that trick with ASC disable? Does that work?