26
SECTION C - TROUBLESHOOTING THE
TRAILER MOUNTED ABS INDICATOR LAMP
ABS Indicator Lamp did not illuminate
during the MC-30
™
controller power-
up sequence.
YES
NO
ABS Indicator Lamp stays on with
no red LEDs on.
With a volt/ohm meter, check the
ABS indicator lamp wiring. Refer to
(fi gure 16)
. When repair is made,
reconnect the 30-pin connector to
the MC-30
™
and rerun the power up
sequence.
Go to Section A.
If the condition still exists, replace
the EC-30T
™
controller.
Turn off the power and disconnect
the 30-pin connector from the
MC-30
™
controller.
With ignition or brake light power
applied to the trailer, verify that the
green VLT LED is on.
Troubleshoot the power supply to the
MC-30
™
controller.
Go to Section F.
With power off to the MC-30
™
controller,
disconnect the 30-pin connector. Verify
continuity from pin D3 of the 30-pin
connector and the ABS indicator lamp
connector. Refer to
(fi gure 16)
. When
repair is made, rerun the power up
sequence.
Go to Section A.
If condition still exists, replace the
EC-30T
™
controller.
Turn off power to the MC-30
™
controller.
Inspect the condition of the ABS
indicator lamp, connector and ground.
Using a volt/ohm meter, verify continuity
across the bulb. Verify continuity
from trailer chassis ground to the ABS
indicator lamp ground pin.
If repair is made, rerun the power up
sequence.
Go to Section A.
Continue if the indicator lamp and
ground wire check out OK.
D3
ABS
Indicator
Lamp
1
2
3
K J H G F E D C B A
30-Pin Connector
