ABS light

If the truck is clicking then it's doing its diagnostics so that's good. Yes trailer is supposed to click unless it's old enough to be exempt. Need to know trailer year but you may have no power to centrr pin on your light cord.

 

Trailer is 2010. Vanguard. There is no power coming from the back of the truck to the center pin. I have two circuit breakers im thinking it might be, trl mrkr or trl tail. Is there an easy way to check these

 

I checked with test light all the circuit breakers. They are all working. Could this be a bad relay?

 

Well I think I have it figured out. Not sure if its "legal" but here's how it works. There is a sticker beside where pigtail plugs in that I never noticed before, says center pin has no continuous power, it is wired for accessorial use. So I find one of my optional switches and find it turns on the power to the center pin. If I have this switched on, as soon as trailer is plugged in it does the initial check and does the clicking as well as light on for maybe 5 seconds then off. Key on or off doesn't matter. However, it does not briefly light up when brakes are applied. If switch is left off, no initial check is done however it does light up briefly every time brakes are applied.

Question: does it need to light up momentarily upon each pressing of brakes? Is there a simple way to trigger a fault to see if the fault indicator is indeed working?

 

Sorry for the delay. I was plowing down an alfalfa field.

Yep you figured it out. ABS gets its power from the center pin so make sure you have that switch on when you get DOT'd. If I understand the ABS system correctly, the trailer light is not supposed to come on with brake applications.

Sounds like there was nothing wrong after all. Well except for the dash light question. Good thing you didn't take it to the TA or they'd probably have installed new ABS computers and modulator valves and other such crap.

 

My truck is the opposite. I have power on the center pin even with the key off. I have no clue how or why it is wired that way. If it's going to be parked for a while I unplug the pigtail. Problem comes when the dot wants to check trailer A.B.S. light. I have to jump out and unplug replug pigtail to let the trailer do it's cycle. It's the same thing as turning the key on off but try to argue that with the long arm of the law.
I'm almost positive that if you are pulling a 98 or newer trailer [ with a.b.s.] with a truck that is pre 94ish? [ without a.b.s.] That the trailer a.b.s. light is supposed to come on momentarily at every brake application. That is signaling all ok. But nothing at start up.

 

When I`m in a `94 or older truck the NYDOT don`t even bother with the ABS...even if the trailer is new.

``Ìt`s a ninety-six you said Driver?``.....
``No, EIGHTY-six.``.
....Òh. EIGHTY-six....(pause as it sinks in).......really?...... Well I guess I won`t worry about checking ABS then.``

Another benefit of old iron.

 

@rank bwahahahaahahahhahahahaha. Throw them abs lights on a toggle and sneakily turn on wait three and turn off. All better now.

@Fishrun They may need your company because the tickets on the company more so than you? Like a fix it ticket, with it being their equipment??

 

April2023 safety blitz next month.
ABS LIGHT IS NOT OUT OF SERVICE

While ABS problems don't lead to out-of-service violations, CVSA wanted to focus on the critical role ABS plays in reducing the risk of collisions by preventing the wheels from locking up or skidding, allowing a driver to maintain control of the vehicle while braking.