Bendix Commercial Vehicle Systems TABS-6 ADVANCED MC SD SHEET - Manual (Page 34)

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Section A: (Power-Up Sequence) Trailer‑Mounted ABS Indicator Lamp . . . . . . . . . . . . . . . Page 34
Section B: (Power-Up Sequence) Dash‑Mounted ABS Indicator Lamp . . . . . . . . . . . . . . . . Page 35
Section C: Troubleshooting the Trailer‑Mounted ABS Indicator Lamp Circuitry . . . . . . . Page 36
Section D: Troubleshooting the Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 37
Section E: Troubleshooting the WS‑24 ™ Wheel Speed Sensors. . . . . . . . . . . . . . . . . . . . . Page 38
Section F: Troubleshooting the Load Sensor (Out‑of‑Range Condition). . . . . . . . . . . . . . Page 39
Diagnostic trouble code information can be retrieved
from the Bendix ® TABS‑6 ™ Adv MC 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 MC module's power-up sequence. If it is
necessary to take electrical measurements, always begin
by taking voltage and resistance measurements at the
7-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.
Troubleshooting: Flowcharts
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
Does the
trailer‑mounted ABS
indicator lamp stay “ON” for
2.5 seconds and then
turn “OFF”?
NO
Perform End-of-Line test
YES