10
AU Freephone 1300 538 598
E sales@trailparts.com.au
www.trailparts.com.au
Troubleshooting
Fault Possible Causes Repairs/Checks
In-cab controller shows
‘Low Trailer Battery’
warning.
(old style In-cab Controller
shows Eb Error)
OR
No tail lights / tail lights
go out when brakes are
applied.
In-cab controller shows
‘Please Drive with Your
Headlights On’ message,
even though the headlights
are on
(old style In-cab shows
Ec Error).
Battery is excessively
discharged.
Bad connection between
trailer mounted brake
controller and battery.
Blown battery fuse.
Poor connection on battery
terminals.
In-cab controller and Trailer
mount controller serial
numbers don’t match.
Faulty trailer plug.
In-cab controller cannot
communicate with the
trailer mounted controller
due to interference.
Incorrect wiring by-passes
controller.
Check battery is over 12.5V when
disconnected. If lower replace the
battery.
Check if battery is charging by
measuring the battery voltage
on the trailer. Measure with the
vehicle disconnected which should
be at least 12V, then plug into the
vehicle and turn on the lights. After
30 seconds there should be a rise
in the battery voltage that shows
the Credo pushing charge into the
battery. The battery voltage should
peak at 14.3V.
Check leads, fuse holder and any
connections between the battery
and controller for poor / corroded
connections. Any high resistance
joins will cause excessive voltage
drop to the controller under
braking resulting in the ‘Low
Battery’ error.
Recode the Serial number on the
In-cab remote.
If they do not match then follow
instructions on page 14/15.
Check trailer plug pins are not
corroded or crushed in, and either
spread the pins, remove corrosion
or replace the plug.
Check the controller to In-cab
connection by taking the in-cab
unit back to beside the trailer
mounted controller, if still error is
still present controller needs to be
replaced or repaired.
Check the vehicle connection
goes to only the trailer mounted
controller and all tail and marker
lights from the controller lights
output.
