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What would be the cause of the back electric door not to lock?

What would be the cause of the electric back door not locking with the others ?
Glen, August 2015
Without knowing make, model and maybe year, all we can offer as a reason is "a fault"

If you can't/won't be specific, we certainly can't.

XX, August 2015
Defective control
Broken wire or connection (including bad earth)
Defective operating solenoid


These are all guesses...

They usually like you to say the make & model - sometimes it helps

Good luck..., August 2015