Bendix Commercial Vehicle Systems TABS-6 ADVANCED SINGLE CHANNEL - Manual (Page 27)

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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 flowcharts will help the technician isolate
the cause and confirm 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
t h e t r a i l e r ‑
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