Towbars and parking sensors

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Paul (admin) Paul (admin)
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Towbars and parking sensors

I'm having an established and local small company fit a towbar to my 2017 Corsa, which is packed with every electronic widget known to man including parking sensors.

There is a lot of hype about towbars triggering parking sensors when reversing, and expensive detachable tow hooks are available. Brian the fitter does not expect problems, nor do I after testing with a sheet of plywood roughly where the tow hook would be - no false triggers unless I deliberalty moved the sheet left or right to cover a sensor.

I rely on a bumper plate when hooking up, so Brian is ordering a detachable stainless plate - more bling to match the chrome trim on my car!

Has anybody else had a towbar fitted to a car with parking sensors? Did you have problems?

-Paul
alopenboat alopenboat
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Re: Towbars and parking sensors

On 2 May 2019 at 1:49, Paul (admin) [via UK HBBR Forum] wrote:

>
> Has anybody else had a towbar fitted to a car with parking sensors?
> Did you have problems?
>

Don't most vehicles disable the sensors when a light board is plugged
in. Works great until you want to reverse down the slipway.

--
Sail when you can, row when you must, motor only
when you have to be at work in the morning.

Alastair Law
Yeovil, England.
<http://www.little.jim.freeuk.com>


inwe inwe
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Re: Towbars and parking sensors

In reply to this post by Paul (admin)
My car had factory fitted towbar with loads  (4) sensors and yes a trailer does trigger the alarm bur hey they are redundant anyway when you are towing. You have to rely on pure common sense and driving skill because you have something behind you! A towing hitch is not in their range. The sensors are only active when its in reverse gear anyway. What's the problem?

Richard
Port-Na-Storm Port-Na-Storm
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RE: Towbars and parking sensors

In reply to this post by Paul (admin)

Well funnily enough...............

I was just in the process of changing the wheels on my trailer as the tyres were a tad on the illegal side.

I bought my van in September and it came with reversing sensors, which I have to say are a godsend in supermarket car parks as people have a habit of wandering around with trollies and not watching when you are trying to reverse.

I had a removable tow bar fitted as that was what was recommended. I had previously tested the lighting circuit for the trailer board, which was fine but hadn't checked what happened when you tried to reverse with a trailer on.

A quick try had the sensors screaming like banshees, but after I read the handbook and attached the lighting socket when I engage reverse the dashboard display shows an image of the rear of the van with a trailer attached and the sensors are deactivated.

😁.

Now, two supplementary towing related questions.

What sort of pressure do you run for the average dinghy/trailer combination?

Where do you get rid of your old tyres?

Regards Grum.


Sent from my Xperia by Sony smartphone



---- Paul (admin) [via UK HBBR Forum] wrote ----

I'm having an established and local small company fit a towbar to my 2017 Corsa, which is packed with every electronic widget known to man including parking sensors.

There is a lot of hype about towbars triggering parking sensors when reversing, and expensive detachable tow hooks are available. Brian the fitter does not expect problems, nor do I after testing with a sheet of plywood roughly where the tow hook would be - no false triggers unless I deliberalty moved the sheet left or right to cover a sensor.

I rely on a bumper plate when hooking up, so Brian is ordering a detachable stainless plate - more bling to match the chrome trim on my car!

Has anybody else had a towbar fitted to a car with parking sensors? Did you have problems?

-Paul


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Timmo Timmo
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Re: Towbars and parking sensors

In reply to this post by Paul (admin)
Echo other people's comments... provided appropriate relay is fitted (so trailer socket is not wired direct to indicator cables etc as we used to in the old days) parking sensors will disengage when trailer is plugged in. How much the system integrates with your car's system (Grahams little 'you're towing something!' symbol for example) seems to depend on whether you have a manufacturers spec trailer wiring system or a more generic bypass relay. Have had the generic bypass relays on several cars (because they're much cheaper) and never had problems.

Never had a removeable towbar, always figured I'd be too lazy to unhitch it and, if I did, would probaby forget where I put it. Folding ones were an option, until the cost was revealed. Have now had fixed towbars on more than 7 vehicles with rear sensors and never had a problem with the sensors picking up the towbar. Though Tony, my local friendly towbar fitter, did recommend a swan neck bar on our recent Tourneo Connect acquisition. Reckoned a full bolt on bar might upset the sensors. Apparently, because the car can park itself, it has extra 

Timsensitive sensors. It's a facility wasted on me. I cannot bring myself to let it drive itself! Feels like being offered a shave by an autonomous cut throat razor. Some things I like to control.

 
On 2 May 2019, at 09:49, Paul (admin) [via UK HBBR Forum] <[hidden email]> wrote:

I'm having an established and local small company fit a towbar to my 2017 Corsa, which is packed with every electronic widget known to man including parking sensors.

There is a lot of hype about towbars triggering parking sensors when reversing, and expensive detachable tow hooks are available. Brian the fitter does not expect problems, nor do I after testing with a sheet of plywood roughly where the tow hook would be - no false triggers unless I deliberalty moved the sheet left or right to cover a sensor.

I rely on a bumper plate when hooking up, so Brian is ordering a detachable stainless plate - more bling to match the chrome trim on my car!<img class="smiley" src="x-msg://40/images/smiley/smiley_cool.gif">

Has anybody else had a towbar fitted to a car with parking sensors? Did you have problems?

-Paul


If you reply to this email, your message will be added to the discussion below:
http://uk-hbbr-forum.967333.n3.nabble.com/Towbars-and-parking-sensors-tp4031016.html
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To unsubscribe from UK HBBR Forum, click here.
NAML

Paul (admin) Paul (admin)
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Re: Towbars and parking sensors

Richard, the "problem" sold by many tow bar websites that advertise via Google, is that reversing sensors can trigger without a trailer.
Hence they recommend the super deluxe (and expensive) remove and lose it tow ball, which Tim talked about.

I guess it depends on the car.
My Corsa has 4 reverse sensors, two inner ones face out 10 degrees from centre line. Combine that with my test and I think I'm in safe waters ha ha.

I'll test with a plastic tow hitch cover in place, with convex curves it could reflect ultrasound back to a sensor.

Paul
inwe inwe
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Re: Towbars and parking sensors

Graham
Run them softer rather than hard. To get rid of them either take them to the tip, they probably charge, Here its about £6 EACH. or find a friendly tyre merchant. If you want to be bold leave them outside your gate. In some places that should take a few days!!!

R
Paul (admin) Paul (admin)
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Re: Towbars and parking sensors

inwe wrote
To get rid of them either take them to the tip, they probably charge, Here its about £6 EACH. or find a friendly tyre merchant.
 
Old tyres count as industrial waste, hence the steep recycling charge. There is a huge pile of old tyres in a farmer's field next to junction 5 Northbound of the M5. The farmer makes a tidy income from stockpiling the tyres, undercutting the recycling charge.

I reckon the best solution for worn tyres is to follow Richard's advice, and ask the tyre merchant to fit inner tubes at the same time as fitting new tyres.

I've lost two trailer wheels when the seals broke, once when I accidentally stood on the tyre wearing safety boots! and the other when the pressure dropped in winter. Inner tubes would have saved the day.

-Paul
Grldtnr Grldtnr
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Re: Towbars and parking sensors

This subject very timely ,bought a replacement car and need to fit a hitch, I too have quieried all this guff about towballs, quiet frankly  isn't it just that, balls ,I mean!
My Skoda has reverse sensors, I have managed 40 + years without them ,tho' I do struggle when reversing trailers, so at an exhorbitant cost of £380 ,I am having a ordinary flanged ball fitted, which I want because I can carry my bike as well. Incidentally , the cost is high because of forthcoming regulations on requirements to have dedicated electrics , so that the vehicle manufacturers safety electronics are still compatible, it will no longer be sufficient to have bypass relays.
Gerald.
Paul (admin) Paul (admin)
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Re: Towbars and parking sensors

The fixed hitch and generic electronic system worked fine on my 2017 Corsa, towing MilliBee to Lechlade and back from Reading.

No problems with reversing sensors. A fixed bumper plate would obscure the number plate, so Brian fitted a removable drop-in stainless plate that I tied permanently to the car with a lanyard. Stainless is perfect, most other bumper plates I've had rusted eventually.




BTW The Corsa is automatic and so, so smooth for towing. Tyre pressures up at 39 front 46 rear as per handbook gave a good ride. Minimal overhang at the rear allows the springs and dampers to control pitching (better than my MK2 Mondeo). My conclusion is that small automatic cars are ideal for towing.

However, keeping an eye on real-time MPG makes me think electric cars would be working very hard towing up inclines. We'll cross that bridge when we hit it.

Plug-in charging at Cobnor? Never say never

-Paul
Grldtnr Grldtnr
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Re: Towbars and parking sensors

Ev's for towing ,or ones capable at the moment are few and far between,  manufacturers are iffy about making them homologated (compliant) , because while they are ok towing, it's the stopping that causes problems with sensitive electronics, being fried by regen forces , half a ton of boat and trailer is going to make a difference, I have asked at dealerships.

Paul ,you are genned up with electricals, so I expect you can offer the for's and wherefores about it all.

Gerald.

I get my towbar the 'morrow.
Paul (admin) Paul (admin)
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Re: Towbars and parking sensors

Gerald,

Towing limits have always been based on the performance of car brakes. So if disk brakes are used on EVs (Electric Vehicles) they should be able to stop safely like an IC car (Internal Combustion).

Trailers above 750 kg have built in brakes, which helps. However the 'gross train weight' is the dominant factor - it is the total weight of car + load + trailer which is printed on the car ID plate.

As for EV regenerative braking that depends on the maximum design speed. A car at 80 mph has 2.5 times the energy of a car at 50 mph. So if EV regenerative breaking can work at 80 mph, it can work ok with double the weight at the 50 towing limit.

I'd expect to see an evolution of trailers at the 500kg braked level and perhaps a revised speed of 55 mph on motorways and dual carriage ways. Typical EV Eco modes limit speed to 55 mph anyway. So petrol heads, get used to driving slower.

Paul