Trailer Abs does not cycle on/off

Trailer ABS doesn't cycle valves. Side ABS light up for short time ti inform you it's powered. If light doesn't cycle with ignition but on every time you depress brake means trailer ABS module energized from brake light and constant power from the truck is lost. Check central wire for +12 volts.

 

Ignition Power Activation
Ignition Power Activation is the process of using
the vehicle’s ignition switch (or interrupting the
power on the blue wire by some other means) to
display blink codes on the trailer ABS indicator
lamp located on the side of the trailer. This
method is for constant power vehicles only.
To obtain blink codes using ignition power
activation, perform the following procedure:
1. Turn the ignition switch on for no longer
than 5 seconds. The ABS indicator lamp will
be on.
2. Turn the ignition switch off. The ABS indicator
lamp will go out.
3. Turn the ignition switch on. The ABS indicator
lamp will then come on, then go out.
4. The blink code will be displayed three times by
the ABS indicator lamp on the trailer.
NOTE: For ignition power activation, power is
provided by the ignition switch

 

Try unplugging the trailer plug and plugging it in again with the key on.
That might get the light to flash a code.

 

Try changing the power cord.

 

How did you determine that the ABS ecu was toast?

 

I wanna know also

 

If the ECU gets its 12V supply but at least one of the connectors for a WSS doesn't read 5V. You're supposed to have a 5V reference going to each sensor. That will cause the light to come on but there won't be any cycling like you'd hear or see.