I had the same problem on an '88 Ford Granada, especially in hot weather, I
would lock it from the drivers door and sometimes it would 'cycle' for up to
2 or 3 minutes until the relay timed out, then I could lock them all
manually with the buttons, I ended up disconnecting the central locking as I
was young, lazy and couldn't be bothered to get it sorted.
Sorry I havn't helped your situation though!!
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