BENDIX BW1959 プリント

STATUS INDICATOR

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T h e   E C - 1 2   c o n t r o l l e r   h o u s e s   t h e
electronics  that  regulate  the  antilock
system.  The EC-12 contains a diagnostic
window and a 14 pin connector.

The EC-12 mounts on the M-12 modulator
with four bolts and it is internally connected
to  the  solenoids  by  a  four  pin  connector.
Sensors  mounted  at  the  wheel  end  send
wheel  speed  information  to  the  EC-12
through the 14 pin connector.  If wheel lock
up is impending, the EC-12 commands the
solenoids  to  modulate  brake  chamber
pressure on the axle(s) in which the system
is installed.  The MC-12  modulator controller
receives power and ground from the vehicles
electrical  system.    During  start  up,  trailer
antilock immediately runs a self check.  The
trailer status light flashes once and then goes
off.  Should a problem occur, the status light
comes on and remains on.

If  the  status  light  remains  on,  inspect  the
EC-12  for illuminated LEDs. If no status light
was  installed,  the  diagnostic  LEDs  should
be checked periodically.

Reset controller with magnet after repair.

Diagnostic
Window

Resistance Across Pins

1500 - 2500 ohms

(Ref. SD-13-4754)

MC-12 Modulator

Controller

(Ref. SD-13-4762)

Mounting

Block

Tie Wrap

7 PIN CONNECTOR

Front

Connector

Wheel Speed

Sensor

IF INDICATOR REMAINS ILLUMINATED

SYSTEM REQUIRES SERVICE