ABS electronic control unit
M50 is supplied (at pins 12 and
25) directly by the battery by the line protected by maxifuse F5
of the engine compartment junction unit B1.
The ignition-operated supply (INT/A) reaches
pin 23 from the line protected by the fuse
F42 of under facia
control unit B2.The control unit is earthed via pins 11
and 24.
The four sensors
K70, K71, K75, K76 send
wheel speed signals tp pins 20-19, 8-7, 22-21, 10-9 of M50, respectively.
Brake pedal switch
I30 sends an enablement
signal to pin 17 of control unit M50: the ABS cannot intervene unless
the brake pedal is pressed.
The switch
I30
is supplied
when the ignition is switched on (INT) from fuse F37 of junction
unit
B2
.
Pin 16 of
M50 emits a discrete speed
signal that is sent tol Body Computer M1;
the same signal is
also copied via the CAN network.
Pins 1 and 2 of ABS control unit
M50
connect to engine control unit M10, Body Computer M1 and and instrument
panel E50 to control the ABS warning light and - if the problem
lies in the EBD function - the low brake fluid level and handbrake
warning lights.
The special 'fault' warning light comes on if
there is a problem with one of the above mentioned warning lights.
Self-diagnostic data can be read by connecting
to connector C of Body Computer
M1- pin 1: it receives signals
from pin 6 of the control unit M50 via the special diagnostic line. See E8010 DIAGNOSTIC MULTIPLE CONNECTOR