User's Manual

27
SectionA:(Power-UpSequence)Trailer‑Mounted ABS Indicator Lamp ...............Page 27
SectionB:(Power-UpSequence)Dash‑Mounted ABS Indicator Lamp ................Page 28
SectionC:Troubleshooting the Trailer‑Mounted ABS Indicator Lamp Circuitry .......Page 29
SectionD:Troubleshooting the Power Supply...................................Page 30
SectionE:Troubleshooting the WS‑24
™
Wheel Speed Sensors.....................Page 31
Section F: Troubleshooting the Load Sensor (Out‑of‑Range Condition)..............Page 32
Section G: Troubleshooting the ECU and Wheel Speed Sensor.....................Page 33
Diagnostic trouble code information can be retrieved
from the Bendix
®
TABS‑6
™
Adv module by using blink
code diagnostics, or a diagnostic tool. The following
troubleshootingowchartswillhelpthetechnicianisolate
thecauseandconrmwhethertheproblemresidesinthe
component, wiring or connectors.
Troubleshooting should always begin by observing the dash
or trailer‑mounted ABS indicator lamp during the TABS‑6
Advmodule'spower-upsequence.Ifitisnecessarytotake
electrical measurements, always begin by taking voltage
andresistancemeasurementsatthe 18-pinECUpigtail
harness connector.
Oncethesourceoftheproblemisfound,isolatethearea
needing repair by repeating the measurements at all
connections in the affected circuit towards the modulator,
wheel speed sensor, etc.
Novoltageorresistancemeasurementsaretobemade
on the bulkhead connector pins of the module.
SECTION A: POWER‑UP SEQUENCE ‑ TRAILER‑MOUNTED
ABS INDICATOR LAMP
ObservetheABSIndicatorLamp
atPower-Up
Apply ignition or brake light power
Troubleshoot the trailer‑mounted
ABS indicator lamp circuitry.
GotoSectionC
Troubleshoot
the trailer‑
mounted ABS
indicator lamp
circuitry. Go to
SectionC
The module is functioning normally.
NoservicetotheABSunitisneeded.
Does
the
trailer‑mounted
ABS indicator lamp
immediately illuminate when
power is applied to the
trailer?
Doesthe
trailer‑mounted ABS
indicatorlampstay“ON”for
6.5 seconds and then
turn“OFF”?
NO
NO
YES
YES
Troubleshooting: Flowcharts
Doesthe
trailer‑mounted ABS
indicatorlampstay“ON”for
2.5 seconds and then
turn“OFF”?
NO
PerformEnd-of-Linetest
YES