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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old August 11th, 2018, 07:11   #1
jbourke367
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Default Inspection - Crash Sensor

So my car is due for inspection in September. In its current state it will not pass due to the airbag light on the dash. The light is for the crash sensor on the drivers side.


2 Faults Found:
01221 - Crash Sensor Side Airbag; Driver Side (G179)
29-10 - Short to Ground - Intermittent
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent


I was going to start with unplugging the battery and waiting 10-20 minutes, unplugging the sensor and inspecting the wires, cleaning the connections then plugging back in to try and clear the code. My question is how to get the carpet up. After some research it seems that this sensor is not under the seat but underneath the carpet. How exactly do I pull the carpet up? I am not sure what trim I have to remove to do so.

Last edited by jbourke367; August 11th, 2018 at 07:24.
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Old August 12th, 2018, 18:01   #2
joep1234
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I had a crash sensor in the front under the bumper cover of my Beetle that would trip a code every time I hit a large water puddle. You could clear it once it dried out. The fix is to clean the terminals and use dielectric silicone on it when you plug everything back up.
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Old August 13th, 2018, 07:14   #3
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I'm surprised it's be a fail - in NY it's only the check engine light that will cause a fail. ABS and airbags don't matter (or really anything besides the ECU saying it's ready)
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Old August 13th, 2018, 07:21   #4
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Remove the seat, pull the sill plate trim up and hang it out of the way (you do not have to remove it completely), and pull the carpet up enough to reach in there to get access.

I would not go through all the trouble of "inspecting" it, just get a new sensor and replace it and clear the DTCs.
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Old August 13th, 2018, 07:37   #5
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Also, for 1999.5 cars anyway, there are only the side impact sensors mounted on brackets, under the sound deadening, under the carpet, under the front seats; and the sensor(s) built into the SRS module. There are no sensors on the front of the car.

To remove the carpet: Remove the seats, center console, b pillar trim, and sill trim.

I want to say the sensors are mounted are mounted just in front of the "cross bar" running across the floor of the car. They might be just in front of the seat track... I can't remember.



-J
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Maybe I should pay MYSELF to do bad work on my car!

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Old August 13th, 2018, 10:53   #6
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Quote:
Originally Posted by compu_85 View Post
Also, for 1999.5 cars anyway, there are only the side impact sensors mounted on brackets, under the sound deadening, under the carpet, under the front seats; and the sensor(s) built into the SRS module. There are no sensors on the front of the car.
To remove the carpet: Remove the seats, center console, b pillar trim, and sill trim.
I want to say the sensors are mounted are mounted just in front of the "cross bar" running across the floor of the car. They might be just in front of the seat track... I can't remember.

-J
I am having trouble finding this part online to purchase. Does this mean the entire SRS module must be replaced? I cannot seem to find the crash sensor by itself for purchase on a 99.5.
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Old August 13th, 2018, 11:04   #7
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I believe there are two versions, with or without side bags, because I think those were still an option in '99, but most of our cars had them?

You can give the dealer your VIN, then have them search ETKA for G179, and it will call out (usually) which one your car needs. But there are sometimes mistakes in ETKA.

Best to get the part number off of the sensor. It takes 10 minutes. It is on the body brace that the forward mount of the seat attaches to. You do not need to take the center console out. Seat, sill plate trim, pull of the carpet, and it is right there. You can usually see the wire harness heading to it once the sill plate trim is up.
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Last edited by oilhammer; August 13th, 2018 at 11:08.
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Old August 13th, 2018, 13:01   #8
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Even Mk3s with side bags had side crash sensors IIRC. Side airbags were standard for 1999 Mk4s.

Looks like the sensor is NLA now?

https://parts.vw.com/p/Volkswagen_19...J0909606M.html

It might be superseded.
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Old August 13th, 2018, 13:11   #9
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6Q0-909-606-K-001 or 002 is what I come up with, the 001 or 002 has to do with it having side airbags or not.... but then when you look it up for a newer car, that I know has side bags, they still list both numbers but no description, just the PR codes.

I think the Golf CL did not have side bags, that may be why ETKA shows that. Not sure though.
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Old August 14th, 2018, 07:57   #10
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having the exact crash sensor. please update in what you've done to fix the problem. thanks in advance for everything! also thanks everyone else for all you posted, i feel it would come handy.
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Old August 18th, 2018, 09:54   #11
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Default What a headache

I am in the process of getting the old sensor out so I can grab a part number off of it. In the process I found that the entire floor of the car is soaking wet! No wonder the sensor is shorting out! I have water dripping out of the grommets and there is a small puddle underneath the car at one of the grommets in the rear. What do I do? Where do I start? idparts sells the grommets for underneath the car but is that likely the issue?

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Old August 18th, 2018, 10:28   #12
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All of the sensors I am finding are red in color vs. this tan one. Is that okay? Or is there something different with it?
[IMG][/IMG]
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Old August 18th, 2018, 10:43   #13
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Quote:
Originally Posted by jbourke367 View Post
I am in the process of getting the old sensor out so I can grab a part number off of it. In the process I found that the entire floor of the car is soaking wet! No wonder the sensor is shorting out! I have water dripping out of the grommets and there is a small puddle underneath the car at one of the grommets in the rear. What do I do? Where do I start? idparts sells the grommets for underneath the car but is that likely the issue?
Got sunroof? If so there's a decent chance the drains (rather, the lack of draining) are the cause of it.

The other high-probability possibility is a plugged drain from the A/C evaporator pan or (you hope not!) a perforated pan itself. The former you can usually clear, the latter sucks badly as you have to pull the entire dash to get to it.
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Old August 18th, 2018, 11:20   #14
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This is the view from inside the car looking at the backseat. Are the grommets supposed to plug the hole completely? Or allow the car to drain if water gets inside? Right now its basically a straight shot to the driveway. I seem to learn everything the hard way.
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Old August 18th, 2018, 11:22   #15
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Quote:
Originally Posted by Genesis View Post
Got sunroof? If so there's a decent chance the drains (rather, the lack of draining) are the cause of it.
The other high-probability possibility is a plugged drain from the A/C evaporator pan or (you hope not!) a perforated pan itself. The former you can usually clear, the latter sucks badly as you have to pull the entire dash to get to it.
No my golf does not have a sunroof
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