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Needs some help diagnosing.

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Old Jun 3, 2025 | 03:46 PM
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Default Needs some help diagnosing.

I was driving and stopped at store. Everything was fine. Come back and crank truck, Front windows will not work, drivers running board stuck in extended poistion, AC will not turn on and finally a Tire Pressure Sensor fault on front left. Truck is a 2016 F150 king ranch 8cyl gas engine. 55K miles on it. Will check all the fuzes when I get home but hoped someone had a quick fix. Thanks, Steven
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Old Jun 3, 2025 | 03:50 PM
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check for a cracked taillight with water intrusion if you have BLIS
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Old Jun 3, 2025 | 03:55 PM
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Will do at next stop. I am assuming if there is it shorted something and affected the other non related systems
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Old Jun 3, 2025 | 04:06 PM
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The electrical connector for the SOD (Side Object Detection) module [aka: BLISS module] is inside the taillamp housing and is unsealed. If you get water into one of the taillamps with CTA/BLISS, the connections to the SOD get corroded or shorted which causes a break in with the MS (Medium Speed) CAN bus circuit. The break upsets the bus addresses causing all sorts of communication problems on the bus. All the modules you are having problems with communicate over the MS CAN bus. This is why it was suggested to check your taillamps.
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Old Jun 4, 2025 | 05:36 PM
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Ok so no water or corrosion inside taillight. Checked all the associated fuzes and relays. All were good. When I was checking the fuses and realys I disconnected the battery since some had some high qmp ratings. After I put everything back in I connected the battery and was ready to admit defeat. I tried one last time and it all worked. I guess disconnecting the battery rest something. Guess I will have to wait for the gremlin to show itself again.
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Old Jun 4, 2025 | 05:38 PM
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Originally Posted by standles
Ok so no water or corrosion inside taillight. Checked all the associated fuzes and relays. All were good. When I was checking the fuses and realys I disconnected the battery since some had some high qmp ratings. After I put everything back in I connected the battery and was ready to admit defeat. I tried one last time and it all worked. I guess disconnecting the battery rest something. Guess I will have to wait for the gremlin to show itself again.
You likely cleared some DTCs in the BCM by disconnecting the battery for a while.
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Old Jun 4, 2025 | 05:50 PM
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The first thing I suspect today when a bunch of funky things start happening is a low voltage (weak) battery that's likely ready to give up the ghost.
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Old Jun 4, 2025 | 06:38 PM
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You inadvertently did a KAM reset. I try to offer that as a fast, cheap, sometimes fix for just like things you had going on. Some listen, some don't, sometimes works, sometimes doesn't.
How olde is your battery?
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Old Jun 9, 2025 | 08:34 AM
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I will go get it checked. Thanks for the tip
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Old Jun 9, 2025 | 08:35 AM
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Originally Posted by johnday in BFE
You inadvertently did a KAM reset. I try to offer that as a fast, cheap, sometimes fix for just like things you had going on. Some listen, some don't, sometimes works, sometimes doesn't.
How olde is your battery?
Thanks, Battery has been in there a while. It is cheap enough insurance I will go get it tested today and changed if neccessary. Especially with a 13 hour roadtrip coming up.

Steven
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