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Does Obd2 Show When Lights Are On And Off?


agent_zed

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more out of interest than actually being able to do anything with the info..

 

So i am fitting a towbar to my peugeot 3008 and by the look of it the actual physical bar bit is an easy job. The hassle comes with all the electrics having to splice into wires and fitting a bypass relay etc

 

So i got to thinking why couldn't someone make a bluetooth (or wireless) obd2 connector (like the elm ones that are £4) that talks to a module that you can stick in the boot and run off the aux power or in the actual trailer on a separate battery. Or even a wired one that isn't fixed you just plug into the obd2 and your front aux socket and run the cable through to the boot to connect to the trailer socket. Which comes back to the first question if the obd2 port knows if you put your brakes on for example.

 

anyone know?

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Guest jhfozzy

Some vehicles can report back which lights are on via OBD so it is possible but I don't know any system that makes use of it.

 

Most new cars are quite easy to fit tow electrics to as they are usually plug and play. However this ease of fitting normally comes at a hefty price. I've fitted some kits that the adaptor cost around £200 and there was no other way to fit.

 

Do not fit an old type trailer hitch (splicing directly into the wires) to a newer car that uses CAN or smart wiring as you can do permanent damage to the car.

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i'm ok splicing in as long as i use a bypass relay aren't i? so the vehicle wiring just tells the bypass to turn on the lights with a different power source. Not like the old days of pulling power from the vehicle lights directly.

 

thats right isn;t it?

 

I asked about 'trailer prep' (which i'd seen mentioned on peugeot forums) and the parts guy at the peugeot dealer hadn't heard of it. Said it would take 4-5 hours labour to fit. From what i can see the towbar fits on the 4 bolts that hang down. 'Should' be a 20min job. If the electrics were plug and play that would be another 20mins..

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Guest jhfozzy

Yeah, sorry I missed you mention a bypass relay.

 

4-5 hours does sound slightly excessive but with the bypass relay unless you have a permanent live in the rear of the vehicle you have to run one from the battery and through (or under) the vehicle.

 

We average out 2-3 hours for a bar and electrics.

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thankfully i have an aux socket in the boot which i intend to use as the power supply. I figure that should be beefy enough for a few lights.

 

This is why i was thinking how awesome it would be in you could plug into the odb and just run a cable through the car when needed off the cigarette socket or have a wireless module receiving in the boot or trailer. Led lights hardly pull any juice so could be run off a separate battery in the trailer. But as this is only in my head i guess i'll stick with the bypass relay for now :)

 

thanks

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ah ok will check.

 

apparently if the trailer is pre 1998 you don't need lights as long the car lights are visible from 6m away in a straight line behind the vehicle. half tempted to buy an old trailer and not worry about lights at all!

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