BLIS disabled while towing?

[jfdube999]

Was towing my utility trailer the other day, and got multiple warnings in the dash as soon as it was hooked up, saying that a trailer was detected and that BLIS was disabled.

Yes, the trailer was calibrated and attached with the new sensor and everything.

It is my understanding from reading a lot of Ford marketing material, that BLIS is supposed to work with a trailer attached and that the system is supposed to compensate and detect the truck's, as well as the trailer's blind spots. If such is the case, why would the dash tell me BLIS was disabled because of my trailer? Or does this "BLIS with trailer mode" only work with certain types of trailers (not utility ones, apparently)?

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[jcaspar]

This is from the manual. Did you input the trailer length?

 

[jfdube999]

This is from the manual. Did you input the trailer length?

I did not do this procedure, thinking that the new "setup with the sensor" thing took care of the basics. I may just have to do so, and perhaps this will solve the problem. I'm assuming this procedure works in combination with the trailer sensor calibrations, and will not screw things up?

Thanks for this btw

 

[Merccat]

There is another thread regarding trailer brakes not working and the same “trailer not detected” message. They seemed seemed to conclude using dielectric grease on your trailer connector resolves the issue.

The electronics must be sensitive to measuring for specific resistance values to “sense” the trailers presence and anything other than an absolutely perfect electrical connection throws it off. Guess the engineers only tested using brand new trailers lol.

But yes, also BLISS needs to know your trailer length to be able to compensate for the blind spot.

 

[jfdube999]

There is another thread regarding trailer brakes not working and the same “trailer not detected” message. They seemed seemed to conclude using dielectric grease on your trailer connector resolves the issue.

The electronics must be sensitive to measuring for specific resistance values to “sense” the trailers presence and anything other than an absolutely perfect electrical connection throws it off. Guess the engineers only tested using brand new trailers lol.

But yes, also BLISS needs to know your trailer length to be able to compensate for the blind spot.

Lol perhaps, and my trailer is actually brand new. It doesn't have brakes however. I did get a few warnings in the dash during my trip saying that there was a problem with the 'left turn signal' connection. Had to unplug everything and plug it back in. Solved the issue. Maybe I should try dielectric grease on those pins too next time.

 

[Merccat]

Lol perhaps, and my trailer is actually brand new. It doesn't have breaks however. I did get a few warnings in the dash during my trip saying that there was a problem with the 'left turn signal' connection. Had to unplug everything and plug it back in. Solved the issue. Maybe I should try dielectric grease on those pins too next time.

Still though, how awesome is it that these trucks will warn you about potential light issues on your trailer. Despite the flakiness which I feel will eventually get worked out (hopefully with updates), that’s pretty darn cool.

 

[jfdube999]

Still though, how awesome is it that these trucks will warn you about potential light issues on your trailer. Despite the flakiness which I feel will eventually get worked out (hopefully with updates), that’s pretty darn cool.

Absolutely! Greatest vehicle I've owned, bar none.

Stil, it's strange though that I was getting those "left turn signal" errors, because I did try all turn signals and they all worked fine, despite the errors thrown in the dash. Oh well, must be over-sensitive lol!

 

[spud_41]

Still though, how awesome is it that these trucks will warn you about potential light issues on your trailer. Despite the flakiness which I feel will eventually get worked out (hopefully with updates), that’s pretty darn cool.

Man, a couple jobs ago I would have loved being able to check brake lights with an app rather than running from the cab to the trailer multiple times every morning.

 

[sonofzell]

There is another thread regarding trailer brakes not working and the same “trailer not detected” message. They seemed seemed to conclude using dielectric grease on your trailer connector resolves the issue.

Just to chime in with a possible clarification, the threads I've seen that mention the blades on the trailer connections reference the application of conductive grease. I'm pretty sure "dielectric" materials/substances are inherently non-conductive, so I suspect using them for this purpose would be counter-productive.

 

[jfdube999]

Just to chime in with a possible clarification, the threads I've seen that mention the blades on the trailer connections reference the application of conductive grease. I'm pretty sure "dielectric" materials/substances are inherently non-conductive, so I suspect using them for this purpose would be counter-productive.

That's a possibility. However, using conductive grease, in my opinion, increases the chance of causing a short with electricity flowing from one pin to another, no?

 

[Its Not Me]

Absolutely! Greatest vehicle I've owned, bar none.

Stil, it's strange though that I was getting those "left turn signal" errors, because I did try all turn signals and they all worked fine, despite the errors thrown in the dash. Oh well, must be over-sensitive lol!

Now I see a pattern...I too received the "left turn signal" error with no trouble with the light (LED) on trailer flashing away happily...something to keep awareness of and report if it pops up again!

 

[Merccat]

Just to chime in with a possible clarification, the threads I've seen that mention the blades on the trailer connections reference the application of conductive grease. I'm pretty sure "dielectric" materials/substances are inherently non-conductive, so I suspect using them for this purpose would be counter-productive.

Yes sorry conductive grease was going by what they called it in the other thread. The goal is to improve connectivity.

Re shorting: the conductivity of the grease is still pretty low (just better than an incomplete connection). Also, don’t soak the thing in the stuff (envisioning a slimer attack). Just need some on the connectors themselves.

 

[Waxer]

Was towing my utility trailer the other day, and got multiple warnings in the dash as soon as it was hooked up, saying that a trailer was detected and that BLIS was disabled.

Yes, the trailer was calibrated and attached with the new sensor and everything.

It is my understanding from reading a lot of Ford marketing material, that BLIS is supposed to work with a trailer attached and that the system is supposed to compensate and detect the truck's, as well as the trailer's blind spots. If such is the case, why would the dash tell me BLIS was disabled because of my trailer? Or does this "BLIS with trailer mode" only work with certain types of trailers (not utility ones, apparently)?

I had this on my 2018 and was always frustrated, until I found out that the BLIS with trailer connection has to be enabled in a different section of the set-up. I had it set-up and working with my 2018. I don't have my 2018 anymore and have not set-up my 2021 yet, but I will look when I get time this weekend and chime back in here.

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