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SECTION B - POWER-UP SEQUENCE -
DASH MOUNTED TRAILER ABS INDICATOR LAMP
Dash Mounted Trailer ABS
Indicator Lamp at Power-Up
Verify that a PLC trailer is connected to
the tractor via the 7-pin connector. Turn
ignition on and observe the trailer ABS
indicator lamp on the dash.
Verify that the dash mounted trailer
ABS indicator lamp illuminates within 2
seconds of ignition power being applied
to the vehicle.
YES
NO
The dash mounted trailer ABS indicator
lamp stays on. This is an indication that
the trailer ABS unit has a fault.
Go to Section A
If the trailer ABS lamp stays on with no
trailer connected,
Go to Section D.
Trailer ABS indicator lamp does not come
on.
Note: Only towing vehicles built after
March 1, 2001 will be required to have
a trailer ABS indicator lamp.
The trailer
ABS indicator 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
ABS unit with PLC.
Verify that a PLC signal is present on the
trailer ignition power lines. (Refer to the
MC-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,
troubleshoot the dash mounted trailer
lamp circuit on the tractor.
If the tractor is equipped with an Bendix
EC-30
™
controller,
Go to Section D.
Verify that the dash mounted trailer
ABS indicator 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.
