1 Introduction
5
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
ON = Turn ON message to the “trailer ABS” lamp
OFF = Turn OFF message to the “trailer ABS” lamp
Removing a trailer with a fault will cause the ABS lamp to turn off.
Remember to have the trailer with the fault repaired as soon as
possible before returning it to service.
ABS Modulator Valves
Modulator valves control the air pressure to each affected brake
during an ABS function.
Valve Arrangement Option
In Figure 1.4, the modulator valves on the rear axle are mounted
separately and a relay valve is used to deliver air pressure to the
modulator valves. There is also an optional valve package available
from Meritor WABCO, the ABS valve package, which may be found
on certain vehicle models. The ABS valve package may be used on
all D and E version units, including D and E Basic, and is available
for front or rear axle installation.
Single Trailer to Multiples ABS lamp is on and
stays on when a new
trailer with no new fault
is added.
There was a fault in
existence before the
new trailer was added
AND the ignition was
not turned off before
the trailer was added.
Use lamp on side of
trailer to identify fault.
Make necessary repairs.
Single Trailer to Multiples ABS lamp is on and
stays on when a new
trailer with a new fault is
added.
ABS fault was in
existence before the
new trailer was added
AND the ignition was
not turned off before
the trailer was added
AND the new trailer has
an ABS fault.
Signal from Trailer to Tractor ECU
Status of Trailer ABS
Lamp on Vehicle Dash Explanation Action
message
lamp on
lamp off
ON ON ON ON ON ON
OFF OFF OFF
0.5
sec
4003986a
message
lamp on
lamp off
ON ON ON ON ON ON
ON ON ON
0.5
sec
4003987a
Table B: Dash-mounted Trailer ABS Indicator Lamp Operation (Information for Service Technicians)
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