Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 - Manual (Page 21)

21
SECTION B - EC-30 ™ CONTROLLER POWER-UP SEQUENCE -
TRAILER ABS WARNING LAMP
Trailer ABS Warning Lamp at
Power-Up
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.
The trailer ABS warning lamp should
illuminate within 2 seconds of ignition
power being applied to the vehicle.
YES
NO
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.
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.
Verify that the trailer ABS warning
lamp stays on for 2.5 seconds and
then turns off.
NO
YES
T h e A B S u n i t i s
functioning normally.
No service to ABS
components is needed.