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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2006

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Airbag light on 2000 Pont Montana

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Paul - 25 Oct 2006 21:59 GMT
In the 6 years I've owned this van, the airbag light has come on a few
times, stayed on for several days, and then stayed out for
months/years.  Now that I want to sell it, the pesky light is back, and
is on more than it is off (bumps in the road set it on/off
occasionally).  Looking at the service manual, I see that the connector
on the airbag computer (located under the front passenger seat
carpeting) has a built in jumper which grounds the low side of the
airbag lamp, illuminating it,  when you pull the connector off of the
computer.  When the connector is seated properly, the jumper is
supposed to open, and let the computer control the airbag lamp.
Apparently the jumper is an anti-tampering device.  I suspect that the
jumper is not fully retracted and is making intermittent contact and
falsely lighting the airbag lamp.  I want to pull off the connector to
inspect/repair the jumper, but the manual repeatedly warns that you
should go thru a lengthy procedure to disarm the airbag circuitry
before attempting ANY repairs, and another lengthy procedure to re-arm
the system afterwards.  They warn that if you don't, you risk
unintentional airbag deployment.  Do I really need to go thru these
procedures before unplugging the connector from the airbag computer?
Wouldn't it be enough to pull the SIR fuse and wait an hour or so?  It
will be hard to sell a car with the airbag lamp on, but harder to sell
if I accidentally deploy one or more airbags.  The disarm procedure
involves ripping out a bunch of trim panels, and I don't want to mess
with that unless absolutely necessary.

TIA,
Paul
MT-2500 - 25 Oct 2006 23:09 GMT
Paul Wrote:
> In the 6 years I've owned this van, the airbag light has come on a few
> times, stayed on for several days, and then stayed out for
[quoted text clipped - 23 lines]
> TIA,
> Paul

It is very risky/dangerous to fool with the air bag system.
They can save your life or kill you in a split second.
Your best bet is to get it on a sir capable scanner and find out where
the problem is.
Or just leave it to a professonal that is trained in air bag repair.
Good Luck
MT

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MT-2500

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Ted Mittelstaedt - 26 Oct 2006 12:03 GMT
> Paul Wrote:
> > In the 6 years I've owned this van, the airbag light has come on a few
[quoted text clipped - 27 lines]
> It is very risky/dangerous to fool with the air bag system.
> They can save your life or kill you in a split second.

Wrong.  Air bags never saved anyone's life who was belted in.
Only fools depend on air bags to act instead of a seat belt.  There's
plenty of stories out there of older cars that were in accidents where
the bag did not deploy.  Whether because the igniter material
got old or the computer was nonfunctional, who knows.

Air bag systems are like any other system.  Easier in fact since
the air bag computer tells you where the problem is.  If you
pull the battery and let it sit overnight without power then the
air bag isn't going to explode.  And when working on the wiring
to the bag you just don't get in front of the bag until you unplug
the bag from the harness, and wear ear protection.  If the bag
does happen to explode due to some dumb thing you did then
you will be changing your pants and off to the wrecking yard for
another bag, then be working on the upholstery with a vacuum
cleaner.

> Your best bet is to get it on a sir capable scanner and find out where
> the problem is.

This, at least, is correct.  You cannot do anything without a
scanner.  Shotgunning an airbag system by wiggling connectors
is as stupid as shotgunning any other electrical system by wiggling
connectors.  At any case, if there is a bad connector it is most
likely going to be in the clockspring other than anywhere else.

Ted
 
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