1997 F150 5.4 4x4 Airbag light code 52 - Ford Truck Enthusiasts Forums



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1997 F150 5.4 4x4 Airbag light code 52

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Old 09-27-2009, 11:55 PM
davinci73 davinci73 is offline
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1997 F150 5.4 4x4 Airbag light code 52

Hi guys New here, but have had my truck for almost 10 years. The problem started when I let the truck's battery run dead due to not driving it for a long time. then airbag light came on with code 52 which means "Backup Power Supply - Voltage Boost Fault". I've searched all over and really no definate fix other than one thread on a forum that says to short the 2 pronged diag connector on the airbag module until the code clears. I've found the airbag module on the pass kick panel (blue in color) but has no 2 prong connectors on it. It only has 2 wide connectors that plug in from the bottom (white and black connector). I've checked all the fuses and all are fine, have disconnected the module and battery for a long time and still same problem.

Has there been anyone that's fixed this code 52 without taking it to the dealer and get robbed? if so, any help would be great.

thanks!
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Old 09-28-2009, 07:33 AM
projectSHO89 projectSHO89 is online now
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The instructions to short the two pins together are bogus. Disconnecting the battery likewise is not effective as the SRS system behaves differently than does the PCM.

You have two choices:

1) Take the truck to someone with a scan tool that works with the SRS system to reset it. The SnapOn Solus is one example of such a scanner.

2) Wait until you've executed 256 key-on cycles without additional faults and the LFC 52 will reset automatically.
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Old 09-29-2009, 06:10 PM
davinci73 davinci73 is offline
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Quote:
Originally Posted by projectSHO89 View Post
The instructions to short the two pins together are bogus. Disconnecting the battery likewise is not effective as the SRS system behaves differently than does the PCM.

You have two choices:

1) Take the truck to someone with a scan tool that works with the SRS system to reset it. The SnapOn Solus is one example of such a scanner.

2) Wait until you've executed 256 key-on cycles without additional faults and the LFC 52 will reset automatically.

thanks for the reply, that's what I thought about the "2pin connector" theory. So is the 256 key on cycle really a workaround, is it documented anywhere? or has anyone gotten the fix by doing just that letting it cycle the ignition switch to "on"?
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Old 09-30-2009, 08:43 PM
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Old 11-20-2009, 10:14 PM
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code 52 is normally low battery voltage. could be the main battery cables or weak battery, etc. after cleaning the cables, ground and checking battery, it can take some time for the code to clear... or go to somebody that can "clear" it.


http://www.f150online.com/forums/ele...ode-5-2-a.html
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