Airbag light and other issues

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Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Airbag light and other issues

Postby Sylvester1994 » Sat Jun 09, 2012 5:38 pm

Good day all! Sorry for the long post, but I need to descibe the symptons accuratly if I'm going to get an accurate answer 8-)

So my little Meggy is doing me proud, with nearly 5,000 miles of almost trouble free motoring behind it, but it has given me a desire to upgrade to a nicer example with at least a 6 speed box, but really, I want a 1.9 dCi. :idea

So, the airbag and service lights are on. Now, I've done a search and I know these 2 lights can come on for the same reason, however, all connections are present and correct. For those who don't know, I bought this car from a friend after it was involved in an accident. The service light was already on when he had it, he was informed by a garage that it was due to the EGR valve, so I've cleaned that out, and the light is still on. The car has had a heavy accident before (that has become evident to me whislt rebuilding it, unless Renault built the back half of the car in Iran in 2003 and the front half in Spain in 2005 anyway) and after removing the steering wheel, I have discovered that the airbag is missing. So at least 1 of the 8 airbags isn't even there, and the car has had another accident since at 70mph with a HGV, and both driver and passenger came out without a scratch and with no chassis damage. A testement I think to how safe these little cars are, it's really earnt my respect! So, in short, I'm not bothered about "fixing" the problem so to speak, I just want to switch the damn light off. A friend has theorised that the service light, which when plugged into the MoT man's computers can be turned off, but when the car is driven just a few miles comes back on, could be reccuring because of another undetected fault that requires resetting. How I can get this off permently is a mystery. The light will switch off on the computer and reappear post accident. :evil:

Also, the auto locking doesn't work. I was informed that it did work before this accident. When you hold the button for 10 seconds, it beeps, but it doesn't lock the doors when you moce off. The button locks the doors when you press it though, so it isn't that. Could this be the proximity sensor or a speed sensor and if so, how can I get it going again?

Also, the passenger door doesn't always open properly, as in you have to continually pull on it hard until eventually opens. :nut

Next question, which is a rather sinister one actually is the cars tendency to cut out whist on the move (Has happened once when staionary) and instead of the little dash display saying "Select Neutral" as it would if you stalled it for example, it switches the steering lock on and says "Please press Start + Clutch" as it does when the card is first inserted. This has only ever happened twice, and only ever at low speed and revs, coniciding with a slight hesitnace at that rev. At approx 1500 revs, sometimes the car stutters as if it's about to stall, but doesn't most of the time, only twice when moving has it cut out and switched the steering lock on. I can't see it being the card or reader, as it recognises the card in the slot, and as I understand it, the card must be in the reader and the car stopped for the engine to shut down. As an experiment, I tried to switch the car off whilst moving (Private road of course) and with 2 presses of the button, it cut out, but said "Press Start + Clutch" again, which I did, and it then said "Select Neutral" which I did, and it fired up again, all with the wheels still turning. :eek

I don't know what to so with the car, and I can't sell it in this condition, so any help would be much appreciated!

Many thanks :D

AlexB
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Re: Airbag light and other issues

Postby AlexB » Sun Jun 10, 2012 2:55 pm

Don't sell it, scrap it. I don't think it can be repaired to the original safety standard.
AlexB
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davelowe
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Re: Airbag light and other issues

Postby davelowe » Sun Jun 10, 2012 10:27 pm

Donate it to a good cause. I'm sure some of us would love to examine it and test it. I'll put a weekend into the adventure, for what it's worth...

It isn't safe for obvious reasons.
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Best advice for Megane owners: sell it before it bankrupts you!

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Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Re: Airbag light and other issues

Postby Sylvester1994 » Tue Jun 12, 2012 11:52 pm

Well, thanks for your thoughts lads, I'm starting to accept that is the only option left. Under the test conditions we got the car going with no problems after it cut out, with the wheel lock relinquishing grip ok. Wondering more than anything else if this is a known problem or hoping it might be one of the cars complex sensors playing up. Ah well, shame, but I'll get my money back on it :-)

AlexB
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Joined: Tue Mar 22, 2005 8:17 pm
Currently Drives:: Renaultsport R.S.250 Cup

Re: Airbag light and other issues

Postby AlexB » Wed Jun 13, 2012 8:51 am

Good thinking, Sylvester1994. I appreciate that you did not swear at me as many would have done. My somewhat abrupt earlier post is actually based on quite a lot of thoughts about reliability and safety of modern vehicles.

Megane II was designed in pre- Atosar or ISO26262 era, but the principles were the same. If you read about these, you will understand how difficult it is to make a complex system safe, which means a guaranty that it will never enter a state beyond the specified space of states under a fault. This is achieved by either immobilising the vehicle under a fault or degrading its performance in a controlled manner. This is exactly what most of ignorant owners are complaining about - a dashboard light is on and it refuses to go.

In your original post you mention the fault when the car cuts out while driving, and shows "Please press Start + Clutch" on the display. This indicates a critical fault under which your safety is supposed to be maintained by the subsystem connected to the wheel sensors, which stop the immobilizer form locking the steering and the steering from loosing the power assistance function. At this point you can forget about ESP, ABS and airbags, which are disabled automatically in order to avoid injury through an inappropriate action. So far, so good, although this is what probably causing your concern.

My concern, however, is caused by the other fragments of your writing where you mention that you were able to shut the engine down while driving by pressing Stop twice (rather than five times) and that the autolock function did not work. These mean that the system is not using the speed information for some reason; it does not "know" that you are moving! Therefore, it may enter a state which is considered safe when the car is stationary, but when it is actually moving at an arbitrary speed. It is not good...

My further thoughts are about the mechanical design of the chassis and the car body. It is virtually impossible to repair the bodywork to any safety standard after a serious accident. Furthermore, if any safety-critical part of the car was repaired in an ordinary commercial garage in the UK, it will not be safe until it is rebuild by a specialist. This is because the rate of mistakes made by mechanics in an ordinary garage is not lower than 1/20 (the best-case estimate), while you may want your car being 0.99999 safe...

Two paragraphs in the above text end with an ellipsis symbol, because I don't know how to bring both the electronic and the mechanical subsystems of the car in question back to an acceptable safety level without a very significant investment. I am not talking about reliability and availability metrics, which are more challenging and may render the whole repair effort useless.
AlexB
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Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Re: Airbag light and other issues

Postby Sylvester1994 » Wed Jun 13, 2012 11:34 am

Alex, many thanks for your detailed reply. This explains the issues to me in a much clearer way than I have previously understood. It's a shame, as I like the car, but I would guess its actually worth more in bits than as a car, especially considering what some breakers wanted for good front ends. The dCi engines runs like a trooper with under 100k on it and the car is in very good general condition and is very nice inside. I've got the room and the time, so perhaps shortly I'll be breaking it up. I'm currently loving the nice weather and have no need to drive the car as I have the use of another vehicle. I hope to be a happy Megane owner again soon though with a bigger engined and preferably 5 door car :D

A CC would be really nice :idea

AlexB
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Currently Drives:: Renaultsport R.S.250 Cup

Re: Airbag light and other issues

Postby AlexB » Wed Jun 13, 2012 1:40 pm

RS maybe?... I would have mentioned something with a clover leaf emblem on it, but it is a Renault forum. :devil
AlexB
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User avatar
Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Re: Airbag light and other issues

Postby Sylvester1994 » Wed Jun 13, 2012 1:53 pm

Unfortunately, 1994 is my year of birth, so I can't afford either! Nah, another Megane or an Astra I think :lol:

AlexB
Driving Legend
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Joined: Tue Mar 22, 2005 8:17 pm
Currently Drives:: Renaultsport R.S.250 Cup

Re: Airbag light and other issues

Postby AlexB » Wed Jun 13, 2012 2:58 pm

Ah, too long to wait until the mid-life crisis strikes...

What about Mito 1.4 or 1.4TB? They are insurance group 8/11 and 15 correspondingly.
AlexB
(no, a different AlexB)

User avatar
Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Re: Airbag light and other issues

Postby Sylvester1994 » Wed Jun 13, 2012 3:26 pm

Shwsh! Don't tempt me! :devil

Finance agreement is calling me :banghead Naaah, I'll stick to something used, and cheap. But this little Meggy may shortly be going to the big carpark in the sky :-( But it's been a cheap and enjoyable 6 months :hug

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ikhan
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Currently Drives:: Megane 1.5 DCi (106)

Re: Airbag light and other issues

Postby ikhan » Wed Jun 13, 2012 3:27 pm

AlexB wrote:... I would have mentioned something with a clover leaf emblem on it...


:gg2:
Renault Megane 1.5dCi (106)
Lowered 45mm (Spax)
RenaultSport R26 Front & Rear Bumpers, Spoilers, Door Bullets, & Exhaust
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User avatar
Sylvester1994
Posts: 14
Joined: Sun Mar 25, 2012 11:01 am
Currently Drives:: Megane 2 1.5 dCi
Location: Anglesey, North Wales

Re: Airbag light and other issues

Postby Sylvester1994 » Wed Jun 13, 2012 9:32 pm

OK OK, I get it!!!!

But if I drive one, I'll only go and buy the bloody thing :no

Actually, I'd love one, and it would be a little multi-air one. They have a tendency to work :nut






:ot

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