Download BENDIX MC-30 TRAILER ABS CONTROLLER Troubleshooting guide

SECTION B - EC-30™ CONTROLLER POWER-UP SEQUENCE TRAILER ABS WARNING LAMP
Verify that a PLC trailer is connected to
the tractor via the seven pin connector.
Turn ignition on and observe the trailer
ABS warning lamp.
Trailer ABS Warning Lamp at
Power-Up
Trailer ABS warning lamp does not come
on.
Note: Only towing vehicles built after
March 1, 2001 will be required to have
a trailer ABS warning lamp. The trailer
ABS warning lamp, located on the vehicle
dash, is only activated by a PLC signal
from a trailer or diagnostic tool. The
towing vehicle must be equipped with
an EC-30™ controller with PLC. Verify
correct EC-30™ controller part number.
Verify that a PLC signal is present on the
EC-30™ controller power lines. (Refer to
the EC-30™ controller with PLC section of
this document.) If a PLC signal is present
and the trailer ABS lamp does not come
on at power-up,
go to Section E.
The trailer ABS warning lamp stays on.
This is an indication that the trailer ABS
unit has a fault. Identify the manufacturer
of the trailer ABS unit and follow
recommended steps for diagnosis and
repair. For Bendix® MC-30™ trailer ABS
controller assembly, see SD-13-4834.
If the trailer ABS lamp stays on with no
trailer connected, go to Section E.
The trailer ABS warning lamp should
illuminate within 2 seconds of ignition
NO power being applied to the vehicle.
YES
NO
Verify that the trailer ABS warning
lamp stays on for 2.5 seconds and
then turns off.
YES
The ABS unit is
functioning normally.
No service to ABS
components is needed.
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