35
SECTION B: (POWER‑UP SEQUENCE)
DASH‑MOUNTED ABS INDICATOR LAMP
Observethedash-mountedTrailer
ABSIndicatorLampatPower-Up
VerifythataPLCtrailerisconnected
to the tractor via the 7‑pin connector.
TurntheignitionONandobservethe
dash‑mounted trailer ABS indicator
lamp.
Trailer ABS indicator lamp does
not illuminate.
Note:Onlytowingvehiclesbuilt
afterMarch1,2001arerequired
to have a trailer ABS indicator
lamp. The trailer ABS indicator
lamp, located on the vehicle dash,
isonlyactivatedbyaPLCsignal
from a trailer or diagnostic tool. The
towingtrailermustbeequippedwith
anABSunitwithPLC.
VerifythataPLCsignalispresent
on the trailer ignition power lines.
(RefertothePLCCommunications
section of this document.)
IfaPLCsignalispresentandthe
trailer ABS lamp does not illuminate
at ignition, troubleshoot the dash‑
mounted trailer lamp circuit on the
tractor.
The dash‑mounted trailer ABS
indicatorlampstays“ON”.Thisis
an indication that the trailer ABS
unithasaDiagnosticTrouble
Code(DTC).
If the dash‑mounted trailer ABS
indicatorlampremains“ON”with
no trailer connected, troubleshoot
the dash‑mounted trailer lamp
circuit on the tractor.
If the trailer ABS lamp remains
“ON”withatrailerconnected,
rerunthepower-upsequencefor
the trailer‑mounted ABS indicator
lamp. Go to Section A.
Does
the dash‑
mounted ABS
indicator lamp illuminate
within 2 seconds of ignition
power being applied to
the vehicle?
NO
YES
The module is
functioning normally.
NoservicetotheABS
unit is needed.
Does
the
trailer‑
mounted ABS
indicator lamp stay
“ON”for6.5
seconds and
then turn
“OFF”?
NO
YES
Does
the trailer‑
mounted ABS
indicatorlampstay“ON”
for 2.5 seconds
and then turn
“OFF”?
NO
Perform
End-of-Linetest
YES
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