Bendix Commercial Vehicle Systems TABS-6 ADVANCED MC SD SHEET - Manual (Page 35)

35
SECTION B: (POWER‑UP SEQUENCE)
DASH‑MOUNTED ABS INDICATOR LAMP
Observe the 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 the ignition ON and observe the
dash‑mounted trailer ABS indicator
lamp.
Trailer ABS indicator lamp does
not illuminate.
Note: Only towing vehicles built
after March 1, 2001 are 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 trailer 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 PLC Communications
section of this document.)
If a PLC signal is present and the
trailer ABS lamp does not illuminate
at ignition, troubleshoot the dash‑
mounted trailer lamp circuit on the
tractor.
The dash‑mounted trailer ABS
indicator lamp stays “ON”. This is
an indication that the trailer ABS
unit has a Diagnostic Trouble
Code (DTC).
If the dash‑mounted trailer ABS
indicator lamp remains “ON” with
no trailer connected, troubleshoot
the dash‑mounted trailer lamp
circuit on the tractor.
If the trailer ABS lamp remains
“ON” with a trailer connected,
rerun the power-up sequence for
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.
No service to the ABS
unit is needed.
Does
the
trailer‑
mounted ABS
indicator lamp stay
“ON” for 6.5
seconds and
then turn
“OFF”?
NO
YES
Does
the trailer‑
mounted ABS
indicator lamp stay “ON”
for 2.5 seconds
and then turn
“OFF”?
NO
Perform
End-of-Line test
YES