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Author Topic: (_!_) SET light came on?  (Read 4930 times)

Offline Betty02

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(_!_) SET light came on?
« on: February 17, 2011, 07:48:42 am »
Well this is embarrassing! It came on this morning on way to work on my dash. Pulled over checked all Tyres etc got back in and held down same button near gearstick for a few decode, it beeped and went of.feel an idiot asking but what does this light mean?
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Offline Cooper

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Re: (_!_) SET light came on?
« Reply #1 on: February 17, 2011, 07:51:39 am »
Typre pressure sensor

Means that there must have been a drop in one of your tyre pressures, it it wasn't obvious which one it was make sure you check them when you get the opportunity
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Offline gulfstream11

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Re: (_!_) SET light came on?
« Reply #2 on: February 17, 2011, 07:52:45 am »
I,ve resisted pressing this button since day 1 of ownership..Its you're tyre pressure monitor.Pressure go,s down light comes on..I've read even the slightest drop is enough to light the bleeder.
Are you the second owner of you're GTI.If so maybe the previouis owner set it up.I don't know if you can have it reset.
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Offline nads1_uk

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Re: (_!_) SET light came on?
« Reply #3 on: February 17, 2011, 07:54:08 am »
I believe it's a low pressure tyre sensor.  Mine has come on in the past, only once mind, I got out checked all the tyres and everything was ok.  I drove to the garage and checked the tyres and again everything ok.  Held the button like you cleared the fault and this have been fine and dandy since - might just be a one off.  If it comes on again check the tyre pressures at a garage.

HTH

Andy
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Offline Betty02

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Re: (_!_) SET light came on?
« Reply #4 on: February 17, 2011, 08:12:16 am »
Must be a very sensitive sensor, all I can think is I swerved quite hard for a nice fresh pothole and it came on so maybe I got some tyre roll, was only doing 25-30 though!

Just got my digital tyre gauge out now, they are all fine no major drops, will get them all on the same PSI.

My omanyts are getting new rubber fitted tomorrow (225/40/18's) what is the best pressure to put in them?

Thanks for the help too!  :notworthy:
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Offline PND

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Re: (_!_) SET light came on?
« Reply #5 on: February 17, 2011, 08:14:34 am »
Set the pressures correctly in all 4 tyres, then press the button till it beeps.  Pressing the button tells the car that all pressures are OK.  Any drop in pressures will (hopefully) then set it off.  Pressing the button when one (or more) may be low is setting it incorrectly and it won't be doing it's job properly!  I think it detects changes through the ABS system (or something similar) so it may have been a pothole-induced hiccup!

Hope that explains it.  :happy2:

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Offline Betty02

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Re: (_!_) SET light came on?
« Reply #6 on: February 17, 2011, 08:19:12 am »
Aghh sh*t so I've pressed it now and it has incorrectly set the pressure! Will it come on with the change over to 18" Omanyts (Currently got standard 17's)?

I want them right? Might let some air out so it picks it up and leave it on until all 4 omanyts are the same and are all on and reset it then?
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Offline PND

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Re: (_!_) SET light came on?
« Reply #7 on: February 17, 2011, 08:24:09 am »
It's only a warning system so it's no drama!  :jumping:  If you just leave it till you've got your new wheels/tyres on and once they've got the correct pressure in them, just press the button again and all will be well.  :happy2:

If you just go with what's written on the inside of your fuel-flap.. Should be something like 2.4bar (34psi) if it's a standard GTI..

Cheers!  :drinking:
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Offline alexperkins

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Re: (_!_) SET light came on?
« Reply #8 on: February 17, 2011, 08:58:49 am »
It uses the ABS sensors in the wheel to detect the rolling radius of the wheels in revolutions per minute. If these increase/decrease, it deems there is a lower pressure tyre, thus enabling the sensor - rather clever little system

Mine did it after about 20 mins when i picked it up - I put it down to the car having new front tyres the day before, and the system not being reset
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Offline VC

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Re: (_!_) SET light came on?
« Reply #9 on: February 17, 2011, 09:19:40 am »
if i change tyres or alloys mine goes off, no drama just push and hold as said  :smiley:
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Offline Richn83

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Re: (_!_) SET light came on?
« Reply #10 on: February 17, 2011, 09:41:33 am »
It also requires you to drive in a straight line for a period of time for the system to detect the rolling radius, it also need to be driven in a straight line for it to activate.  And it really isn't very sensitive its takes a high percentage distance to trip, for this reason it wasn't suitable for fitment in the US and they had to put a more sophisticated system in that has other sensors to provide a correction factor.

My main problem with the system is that it requires you to be moving for it to trip and when your half way home and your tyres are warm its very difficult to correctly rectify a difference in pressure.
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Offline vRStu

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Re: (_!_) SET light came on?
« Reply #11 on: February 17, 2011, 09:53:22 am »
I guess there is always the consideration of reading the manual too  :evilgrin:

You can set it as many times as you like and it should be set after routinely adjusting your tyre pressures.
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Offline RedRobin

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Re: (_!_) SET light came on?
« Reply #12 on: February 17, 2011, 10:30:16 am »
Quote from: alexperkins on February 17, 2011, 08:58:49 am

It uses the ABS sensors in the wheel to detect the rolling radius of the wheels in revolutions per minute. If these increase/decrease, it deems there is a lower pressure tyre, thus enabling the sensor - rather clever little system


....Doubtless a silly question, but where are these ABS sensors? They're not actually fitted on the wheel itself (as my TyreSure wireless sensors are).
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Offline bodger00

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Re: (_!_) SET light came on?
« Reply #13 on: February 17, 2011, 10:31:37 am »
The tyre pressure monitor is your friend :happy2:

Use it so when your missus has a flat, she notices a light and then phones you :wink:
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Offline rich83

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Re: (_!_) SET light came on?
« Reply #14 on: February 17, 2011, 10:33:35 am »
Robin... the ABS sensor is on the hub itself, as pictured below albeit on a mk4. The plastic part is the sensor/connector and the 'holed' disc gives the sensor its reading (a bit like a speedo on a push bike)



All it does it calculate the rotational speed of the wheel, the ESP system also works off this information.
« Last Edit: February 17, 2011, 10:44:45 am by richwig83 »
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