Knorr-Bremse Group
7
Doc. No. Y250910 (EN - Rev. 001)
September 2016
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KB4TA / KB4TA D System Diagnostics
C o m m e r c i a l V e h i c l e S y s t e m s
PD-203-390
Chart 2
Power-up Sequence − Trailer-mounted ABS Warning Lamp
NO
NO
YES
YES
Apply ignition or stop lamp power and
observe the trailer-mounted
ABS warning lamp.
The trailer-mounted ABS warning lamp
should immediately illuminate when the
power is applied to the trailer.
Verify that the trailer-mounted ABS warning
lamp stays “ON” for approximately 2 se-
conds and then goes “OFF”.
The KB4TA module/KB4TA D ECU is
functioning normally. No service to the
ABS unit is needed.
ABS Warning Lamp at Power up.
Troubleshoot the trailer-mounted
ABS Warning Lamp circuitry.
Go to Chart 3.
Troubleshoot the trailer-mounted
ABS Warning Lamp circuitry.
Go to Chart 3.
Y026787: 006: EN: Released: Fri Nov 11 11:18:50 CET 2016: