Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 User Manual
Page 22
22
SECTION C - TROUBLESHOOTING THE ABS WARNING LAMP
ABS Warning lamp did not illuminate
during the EC-30
™
controller power-
up sequence.
With a volt/ohm meter, check the
ABS warning lamp, wiring, relay and
fuse. Refer to fi gure 13. When
repair is made, reconnect the 30-pin
connector to the EC-30
™
controller
and rerun the power up sequence.
Go to Section A.
Note: If there is no wire in pin E3
of the 30-pin connector, the EC-30
™
controller is commanding the ABS
warning lamp, using the J1939
serial communications link.
In this confi guration, the actual lamp
is driven by a vehicle dash controller.
Obtain the vehicle manual and verify
the wiring and function of the ABS
warning lamp.
To verify proper EC-30
™
controller
communication, go to Section K.
With a volt/ohm meter, check the
wiring, relay, and fuse. Refer to
fi gure 13. When repair is made,
reconnect the 30-pin connector to
the EC-30
™
controller and rerun the
power up sequence.
Go to Section A.
Turn the ignition on and verify that
the ABS warning lamp turns on.
YES
NO
With ignition on, measure voltage
between pin E3 and ground (pins A1,
A2 or A3). Verify a measurement equal
to battery voltage. (About 12.0 VDC)
YES
NO
I
f having the EC-30
™
controller
connected was preventing the ABS
warning lamp from doing a power-
up lamp check, verify that power
at the EC-30
™
controller is getting
cycled with the ignition switch, by
observing the green VLT LED. Check
for corrosion or damage on the 30-pin
connector and wiring. If none is found,
replace the EC-30
™
controller.
Turn the ignition off and disconnect
the 30-pin connector from the
EC-30
™
controller.
See Note
this page
ABS Warning lamp stays on with no
red LEDs on.
With a volt/ohm meter, check the
wiring, relay and fuse. Refer to
fi gure 13. When repair is made,
reconnect the 30-pin connector to
the EC-30
™
controller and rerun the
power up sequence. If the condition
still exists, replace the EC-30
™
controller. Go to Section A.
E3
ABS
Warning
Lamp
A1,A2,A3
Ground
1
2
3
K J H G F E D C B A
30-Pin Connector
See Note
this page
Turn the ignition off and disconnect
the 30-pin connector from the
EC-30
™
controller.