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Discussion Starter #1
I have a 1991 Mustang GT and am trying to find the backup battery to the airbag module and can't seem to locate it.

The module has two part numbers:

FD0F14B056AA

"With Foam" F1Df14B056AA


Now my module has a strip of foam on it, so I'm assuming it's the "With Foam" number but I have no idea.

It unplugged from the harness with two plugs and was located behind the A/C controls. But for the life of me I can't find where a backup battery might exist.

Thanks for any help
 

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it's the bank of capacitors inside the module, they are likely bad.

You can also blow the safety fuse inside the module if you disconnect a sensor with the battery connected.
 

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Discussion Starter #3
it's the bank of capacitors inside the module, they are likely bad.

You can also blow the safety fuse inside the module if you disconnect a sensor with the battery connected.
No I'm looking for a separate box that is the backup battery. I thought it was behind the glovebox, but the only thing behind there is the A/C unit.

In the picture below the smaller box is what I'm looking for.
 

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Discussion Starter #4
Well I found the backup battery. That apparently is good.

I got another module that was a different part number but supposed to be for 90-91 Mustangs and that gives me an error code of 13

Sigh.
 
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