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Air Bag Impact Sensor - 2006 GMC Sierra
#1372019 Tue Aug 04 2020 02:30 AM
Joined: Dec 2013
Posts: 877
Shop Shark
A couple of years ago, one of the front air bag impact sensors went out on my GMC. I got out my scan tool and found that sensor 1 (driver side) was bad. I replaced it thru NAPA for approximately $135.00 with an employee discount. I think they retail for some where north of $330.00.

Last week, sensor 2 (passenger side) went out. I purchased a used OEM sensor on EBay for $45.00, with a money back guarantee. The front impact sensors are located on a cross member that's covered with a plastic shield. These things seem to corrode from the inside to the outside and are known to fail for no good reason at all. It's a terrible design in my opinion. Anyone have a good source on these over-priced little gems?

Thanks,


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377632 Sat Sep 19 2020 01:41 PM
Joined: Dec 2013
Posts: 877
Shop Shark
I installed the replacement sensor and reset the error code. No problems noted.

I decided to cut the sensor open and have a look. Here's the internal corrosion I mentioned, (CLICK). [flickr.com]


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377638 Sat Sep 19 2020 03:50 PM
Joined: Apr 2005
Posts: 9,023
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Well, that explains that!šŸ‘šŸ»


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
ā€˜65 Chevy Biscayne 4dr 230 I-6 one owner (Iā€™m #2)
ā€˜39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
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Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377651 Sat Sep 19 2020 05:42 PM
Joined: May 2015
Posts: 2,801
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Would it do any good to slather it with silicone? Of course, that probably wouldn't help on the used one if corrosion has already gotten a foothold.

I couldn't even tell from your picture how the dang things might work. Was that a circuit board I saw? Some sort of accelerometer, I assume.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377710 Sun Sep 20 2020 01:07 AM
Joined: Dec 2013
Posts: 877
Shop Shark
That silicone might be a good idea on a new sensor, but it seems like the aluminum bushing oxidizes from the inside out. The sensors reside in a rough neighborhood, nestled under the radiator on a cross member. I'd be happy to pay a little more for a sensor that didn't corrode, but I don't think that's an option. Maybe a stainless steel bushing would be the solution?

Yes, a crusty circuit board and most likely an accelerometer. When I tested the one in the pic with my ohmmeter it was open. I'm not sure what the resistance would be on a good sensor?


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown
Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377716 Sun Sep 20 2020 01:33 AM
Joined: May 2015
Posts: 2,801
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Did the aluminum bushing split and take out the circuit board? I have a kicker mount on my boat that did that. Stainless thru-bolts with aluminum spacers. The aluminum corrosion products are like ice (bigger than the original material). Result is split bushings.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Air Bag Impact Sensor - 2006 GMC Sierra
HandyAndy #1377751 Sun Sep 20 2020 02:08 PM
Joined: Dec 2013
Posts: 877
Shop Shark
Yes, that's my take on the sensor failure. I suppose once they split, moisture finds its way in. The result is a short on the circuit board. It's a terrible design built for failure.


Andy

His: 1947 Chevrolet 3104 [flic.kr]
Hers: 2008 American Saddlebred [flic.kr]

"I proudly Stand for the Flag and Kneel for the Cross" Unknown

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