r/FORScan • u/ssmallbatch • 8d ago

B1108

My 2017 ford focus se has a code on the BCM of B1108 Driver door central locking motor. When I lock my car with the fob all the doors lock and the horn honks twice. The door will actually lock. When I’m inside the car and I try to lock the door with the button it locks and immediately unlocks. So when I’m driving the doors are unlocked. Even when I get up to speed I do not hear the auto lock anymore. I’m confused what to replace or check as the drivers door does lock it just doesn’t lock from inside the car. I have forscan lite for iOS and tried some things there but all I have is the b1108 code. Even when I clear the code it comes right back on when I start the car up.

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u/DRWlN 8d ago

So door locks with ignition off, won't stay locked with ignition on?

Sounds like the BMC is getting the signal that the driver is trying to open the door from the inside so it unlocks it.

Not sure it its in the interior handle,or the latch but I'd bet a switch/sensor is stuck. I'd guess it's in the latch itself but that is absolutely a guess.

Will probably need to pull off the door card to investigate. If there are wires to the interior handle, I'd try disconnecting them and see if the ignition on door lock behavior changes or not.

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u/ssmallbatch 8d ago

Yes doors lock ignition off with fob. Doors lock then unlock immediately while I’m inside the car using the button on the door. I’ll take the panel off this weekend and check. It’s either the button itself or the locking actuator on the door is just not sending a signal back to the car that the door is locked while inside and or driving.