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under bonnet next to the batttery
The BMW 518 central locking relay switch is located beneath the dashboard. The central locking relay switch will be on the drivers side of the dashboard.
check the wires and switch and maybe relay
The central locking relay is attached to the ECU, fitted behind the right (EU) back passenger side panel.
negative triggering relay.
drivers side door
Don't sell the car, its probably just a relay that need replacing.
sounds like the towing electrics have been wired up wrong
They are at the back behind the ashtray, look in the gap at the top of the fuses.
There are 4 central locking relays on this car. In one of the engine bay fuse boxes, the one whcih contains the multi fuction module. There are six slots above this, 4 of them contain the central locking relays. Good luck....
inside of the driver side door
in the fuse box under the bonnet its a 15amp blue.