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
configuration 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 configuration, 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 figure 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
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