Problem with security system
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Joined: May 2025
Posts: 1
Problem with security system
I have a 2017 F250 Super Duty, I removed the rear seats to make room for dog kennels in the back area, after removal the security system goes off five or six times when parked and locked.
Is the security system connected with the back seat in some way?
I unplugged the wiring to the seat when removed.
Is the security system connected with the back seat in some way?
I unplugged the wiring to the seat when removed.
Last edited by Dusty 1; May 28, 2025 at 02:01 PM.
Senior Member
Joined: Feb 2024
Posts: 1,229
From: California
During your rear seats removal you might accidentally interfere pulled or pinched with the BSM (body security module) or any other modules wiring harness you didn't pay attention to. Note that even BSM is not in the rear seats area and PCM is the brain, a hub that can communicate with other modules, so it's possible for BSM to interconnect with other modules indirectly thru the PCM.
Rule number one, always disconnect your battery ground cable when working with any electrical within your car.
Here's an example of a mistake 99% people continue make mostly because they are either clueless or lazy or don't have the right tool.
How to check a fuse in the fuse box?
When you have a DMM (check for resistance or continuity) or test light simply probe the 2 little exposed terminals on top of the fuse without removing the fuse itself
When you pull the fuse out for visual inspection or to bench test the fuse with your DMM without disconnecting your battery ground, the moment you pull you create a break to the circuit. A break like this might not have any affect to older cars but not on newer cars since 2 decades ago that such break can send an alert to the module and even trigger a CEL or a DTC.
Now let's get back to your BSM, if you inadvertently created a break by pulling the seat connector out without first disconnecting your battery ground, the consequences are unimaginable.
What to do now?
Use a capable scanner with bidirectional support (foxwell nt510 elite w/ Ford) to reset your BSM. When PCM is the hub, a scanner like that should be able to reset any module that can communicate with the PCM. Or check online how to reset BSM without a scanner.
If the reset doesn't help, you will need to inspect all the nearly affected wiring during your rear seats removal.
Rule number one, always disconnect your battery ground cable when working with any electrical within your car.
Here's an example of a mistake 99% people continue make mostly because they are either clueless or lazy or don't have the right tool.
How to check a fuse in the fuse box?
When you have a DMM (check for resistance or continuity) or test light simply probe the 2 little exposed terminals on top of the fuse without removing the fuse itself
When you pull the fuse out for visual inspection or to bench test the fuse with your DMM without disconnecting your battery ground, the moment you pull you create a break to the circuit. A break like this might not have any affect to older cars but not on newer cars since 2 decades ago that such break can send an alert to the module and even trigger a CEL or a DTC.
Now let's get back to your BSM, if you inadvertently created a break by pulling the seat connector out without first disconnecting your battery ground, the consequences are unimaginable.
What to do now?
Use a capable scanner with bidirectional support (foxwell nt510 elite w/ Ford) to reset your BSM. When PCM is the hub, a scanner like that should be able to reset any module that can communicate with the PCM. Or check online how to reset BSM without a scanner.
If the reset doesn't help, you will need to inspect all the nearly affected wiring during your rear seats removal.
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Ellen Kachalsky
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Jan 1, 2018 12:55 PM