Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 User Manual
Page 24
24
SECTION E - TROUBLESHOOTING THE TRAILER ABS WARNING LAMP
Trailer ABS Warning lamp did
not illuminate during the EC-30
™
controller power-up sequence.
With ignition off, remove the 30-pin
connector from the EC-30
™
controller.
YES
NO
Turn ignition on and measure voltage
between pin E2 and ground (pins A1,
A2 or A3). Verify a measurement equal
to battery voltage. (About 12.0 VDC)
Only towing vehicles built after
March 1, 2001 will be required to
have a trailer ABS warning lamp.
The trailer ABS warning lamp,
located on the vehicle dash, is only
activated by a PLC signal from
a trailer or diagnostic tool. The
towing vehicle must be equipped
with an EC-30
™
controller with
PLC. Refer to the part number and
confi guration to ensure that the
EC-30
™
controller supports PLC
communications.
Check for corrosion or damage on
the 30-pin connector and wiring. If
none is found, replace the EC-30
™
controller.
With a volt/ohm meter, check wiring,
trailer ABS warning lamp and fuse.
When repair is made, reconnect
the 30-pin connector to the EC-30
™
controller and rerun the power up
sequence. Go to Section A.
1
2
3
K J H G F E D C B A
30-Pin Connector
E2
Trailer
ABS
Warning
Lamp
A1,A2,A3
Ground
See Note
this page
Note: If there is no wire in pin E2
of the 30-pin connector, the EC-30
™
controller is commanding the trailer
ABS warning lamp using the J1939
or J1587 serial communications
link.
In this confi guration, the actual trailer
ABS lamp is driven by a vehicle dash
controller. Obtain the vehicle manual
and verify the wiring and function of
the trailer ABS warning lamp.
To verify proper EC-30
™
controller
communication, go to Section K.
Trailer ABS lamp stays on with no
trailer connected to towing vehicle.
With a volt/ohm meter, verify no
continuity from trailer ABS warning
lamp connector pin to ground. Refer
to fi gure 13. Check for corrosion
or damage on the 30-pin connector
and wiring. If no issues are found,
replace the EC-30
™
controller.
With ignition off, remove the 30-pin
connector from EC-30
™
controller.
See Note
this page