Is this convinience relay the box that sits under the rear seat behind the driver. I have auto down front windows, and have tried to do the key held to lock in door trick but it never worked for me.

btw my car has a keyless entry system that has been installed aftermarket, its quite a bunch of wires and 2 Bosch relays too, All of this lives under the knee panel of the driver dash. My car does have a working original alarm system but to make that work I have to lock to trunk or the driver's door with the key. The keyless itself has its own horn but its pretty goofy.

With the keyless I cannot lock or unlock the doors with the remote if the engine is running.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)