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Service Air Bag
02-02-2015, 08:53 PM
Post: #1
Service Air Bag
1997 Cadillac Deville with "Service Air Bag" displayed on the display. The code it reported was SDM B1148 which indicated the passenger door airbag system. I replaced the original Side Air Bag Sensor (16209116) with a wrecking yard 25732983 module which according to the GM dealer was the last release of that module and was backward compatible. I cleared the SDM codes and now it is reporting a SDM B1147 (Drivers Door) code. Obviously the Service Air Bag message is still on the display. I have no idea what's going on. The only thing I can think of is the "updated" modules may have to be replaced in pairs.

Note: I do not have access to a scanner or Modis so I read/cleared the codes through the dash controls.

Any help would be appreciated.
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02-02-2015, 10:47 PM
Post: #2
RE: Service Air Bag
Not all that familiar with this car so reading on the web these modules go into self test each time the ignition is switched on and that code tells us the circuit resistance is not correct. IOW, open, shorted, or defective module.

OTOH, if one module failed due to old age then it's quite possible the other is suffering the same fate. Perhaps a trip to the same salvage yard for parts on the other side?

What I would do first is take the necessary precautions of disabling the system (disconnect the battery and wait) then follow the harness to the driver's side sensor / module and double check for damage or poor connections. I am not aware of any other tests that can be done by DIY types other than asking nicely if a dealer can scan the system for clues. I have not found a way to see if the code is current or history without using a scan tool. What I am driving at is the possibility that YOU set a code while working on the system and for some reason it will not totally clear from the dash.

Let us know how you make out.
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02-03-2015, 08:42 PM
Post: #3
RE: Service Air Bag
It was the dealer that told me it was the sensor (for $135.00). When you pull the OBDii codes on the dash on these cars it shows the error codes as either "current" or "history". The history codes won't turn on the Service Air Bag warning. The battery was disconnected when I changed the sensor so I don't see how I could have caused it but anything's possible.


(02-02-2015 10:47 PM)Rupe Wrote:  Not all that familiar with this car so reading on the web these modules go into self test each time the ignition is switched on and that code tells us the circuit resistance is not correct. IOW, open, shorted, or defective module.

OTOH, if one module failed due to old age then it's quite possible the other is suffering the same fate. Perhaps a trip to the same salvage yard for parts on the other side?

What I would do first is take the necessary precautions of disabling the system (disconnect the battery and wait) then follow the harness to the driver's side sensor / module and double check for damage or poor connections. I am not aware of any other tests that can be done by DIY types other than asking nicely if a dealer can scan the system for clues. I have not found a way to see if the code is current or history without using a scan tool. What I am driving at is the possibility that YOU set a code while working on the system and for some reason it will not totally clear from the dash.

Let us know how you make out.
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02-03-2015, 09:46 PM (This post was last modified: 02-03-2015 09:47 PM by Rupe.)
Post: #4
RE: Service Air Bag
Found a few pages of tech bulletins that may be worth looking through to see if something applies in your case. Perhaps a clue to your idea of both sensors needing to be done together?

http://www.automd.com/tsb/cadillac_m/deville_mm/1997_y/
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02-17-2015, 10:58 PM
Post: #5
RE: Service Air Bag
Update: After a couple of days the air bag warning went out only to come back on and off again intermittently. The code continued to show the drivers side module so I replaced it with the same part number as I did the passenger side. I may be jumping the gun but so far no errors or warnings. Conclusion, I either had two bad modules or the "updated" part number must be changed in pairs.


(02-03-2015 09:46 PM)Rupe Wrote:  Found a few pages of tech bulletins that may be worth looking through to see if something applies in your case. Perhaps a clue to your idea of both sensors needing to be done together?

http://www.automd.com/tsb/cadillac_m/deville_mm/1997_y/
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02-17-2015, 11:20 PM
Post: #6
RE: Service Air Bag
Thanks for the update as very few people take the time for a follow up.

BTW, my gut feeling on stuff like this is both sides have seen the same service under the same conditions over the years so likely they will fail within a similar time frame. IOW, similar to a tail light... when you change one the other fails soon so you might as well change all of them at the same time. (well, bulbs are cheaper but you see what I mean)

Anyway, keep us posted if anything else develops.
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