Tiburon SRS again

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Robert Zimmermann - 24 Jan 2005 20:38 GMT

Hello,

i wrote a week aog, that i had a little Problem with my SRS of my '97
Tiburon 2,0FX.
The car wasn't moved over the weekend and as i startet the engine on monday
morning, the (srs malfunction-) indicator light flashes 6 times and then
stays on continuously. The outside temperature was about -2 degr. Celsius.
Supply Voltage is 13,5V while engine running and 11,8V engine
stopped/ignition on.

After "hyundaitech" gave me the hint (thank you), i had it scanned on
Wednesday. The fault was, that the SRSCM had detected "dab - high resistance
". My dealer resetted the code, the light was off.
Everything worked fine. Thursday, Friday, no problems. Today (monday) the
same procedure as last week. Temperature below -5 degr. Celsius and the car
wasn't moved since Friday. After starting the engine, the inicator-light,
flashes six-times and stays on again.
Any hints?
I don't think, there is a problem with the dab.
Can it be, that becouse of a low batterie voltage while starting, the srscm
recognizes a problem, where there is no problem?

Thanks in advance
Rob

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hyundaitech - 24 Jan 2005 23:17 GMT

Intermittent high resistance issues with the Driver's Air Bag (DAB) are
typically caused by the clock spring, the device in your steering column
maintaining contact as you turn the steering wheel. I'd replace it or
have it replaced.

Did the dealer do any actual diagnosis, or just read the code, tell you
what it was, and clear the lamp?

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Robert Zimmermann - 25 Jan 2005 18:24 GMT

> Intermittent high resistance issues with the Driver's Air Bag (DAB) are
> typically caused by the clock spring, the device in your steering column
> maintaining contact as you turn the steering wheel. I'd replace it or
> have it replaced.

Really? As i wrote, i had this problem twice. In both times, the car wasn`t
used for more than two days and it was cold. It didn't appear, when the car
was used a day before. Somehow i thought that a low batterie voltage while
starting the engine could cause the problem.
But in every case, i will (as soon as it got a little bit warmer outside)
check the clock-spring. After disconnecting the dab, an Ohm-Meter should
show whether there is a problem with it or not. Thanks very much.

> Did the dealer do any actual diagnosis, or just read the code, tell you
> what it was, and clear the lamp?

He just read the code and cleared the lamp.
But, by the way, i don't trust very much in the electronical knowledge or
capacity of a "normal" German automechanic. Normally they change one part
after the other as long as the problem is gone. And you have pay each and
every part. :-(

Rob

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hyundaitech - 26 Jan 2005 20:56 GMT

I would strongly recommend against trying to check this with an ohmmeter.
This can trigger an air bag to blow off or damage the computer. Also, to
prevent unwanted deployment, many connectors have shorting bars that short
the pins together when that connector is unplugged to prevent there being a
potential which could cause an air bag to deploy.

A low battery voltage *will not* cause the code you received. All the
conditions you describe are consistent with a clock spring failure.

For liability reasons and for your own safety, I advise you to not try to
electrically check your air bag system and will provide no advice on how
to do so. I don't know you and I do not know how qualified you would be
to take such an undertaking. If it makes you feel any better, if it were
my car, I would just buy the clock spring and put it on if I had your
symptoms. In your case, however, I would advise paying a professional to
work on it, since it involves the dangers of the air bag system.

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Robert Zimmermann - 27 Jan 2005 19:16 GMT

> I would strongly recommend against trying to check this with an ohmmeter.
> This can trigger an air bag to blow off or damage the computer. Also, to
> prevent unwanted deployment, many connectors have shorting bars that short
> the pins together when that connector is unplugged to prevent there being a
> potential which could cause an air bag to deploy.

I know. As i wrote in my last mail, i, of course, will disconnect the dab
(from the clock-spring - and, of course, also the srscm on the "other side
of the wire") - _first_.
After doing so, there is only a "piece of wire" including the clock-spring
left, that can be checked with an Ohm Meter i guess.

> A low battery voltage *will not* cause the code you received. All the
> conditions you describe are consistent with a clock spring failure.

Thank you. I definitely _will_ keep that in mind. I'm glad about any
information i can get and very thankful about your help.

> For liability reasons and for your own safety, I advise you to not try to
> electrically check your air bag system and will provide no advice on how
> to do so. I don't know you and I do not know how qualified you would be
> to take such an undertaking.

Sorry, i should have given the information first, that i'm an
electronic-engineer and in electronics for 23 Jears now.
I think i _am_ qualified to know, what and where i'm able to measure.
So don't panic...:-))

>If it makes you feel any better, if it were my car, I would just buy the

clock spring and put >it on if I had your symptoms.

It does make me feel better.

>In your case, however, I would advise paying a professional to work on it,

since it >involves the dangers of the air bag system.

Belive it or not, the owner of a car with symptoms like mine, that takes ist
to a normal German Garage (even Hyundai), will have the dab, the clock
spring and probably the srscm replaced. If he is in bad luck, the complete
wiring will be replaced too.
Therefore i would like to know, where the problem _really_ is. I hope you
will understand that.

Rob

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hyundaitech - 28 Jan 2005 02:32 GMT

I do. Good luck.

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