Trailer ABS

There is a system you can use to get blink codes if you don't have a code reader. For my trailer, I can unplug the electrical cord, wait 1 second, then plug it back in five times in a row. After the last time of plugging it in, the yellow ABS light on the back driver side of the trailer will use a combination of short and long blinks to let me know which code it is. I'll search Google or I think I have a PDF on my phone to cross reference the code, then troubleshoot from there.

There are a number of different things that could cause the ABS light to come on, so you'll want to know which codes you are having in order to begin your troubleshooting. It could be a faulty sensor(or sensor not close enough to the tone ring), a mechanical problem with a wheel end, faulty wiring, or even a bad brake control unit.

 

Look inside the backs of the wheels, at the brake assemblies, and make sure the ABS sensor rings aren’t hanging on the axle tubes.

I can’t remember which manufacturer/model of brakes. But, where I used to work, they had a massive problem with sensor rings coming off the hubs, so checking for them became part of my pre-trip. I encountered three different trailers, myself, and had to have the loads swung.

They look something like this.

 

What does a reefer trailer have to do with abs?
You need to figure out what that plug is for and what is all involved with it

 

Have to agree with Flood, but you can also do a visual inspection. You can have a chaffed sensor wire like Uncleal13 suggested.
You may still have to take it to a shop to have it replaced.

 

There will be small coaxed cable on top of each axl enyering hub.
both sides follow cable to sensor and push in with a flat bar like a pencil size.