Further to Mike's message there is a switch actuated by the door locking
indicator button which is for actuation of central locking function. This is
only on driver's door so that the driver's key can operate the central
locking function. This has to be wired into the alarm or immobiliser
circuitry for central locking to work from a remote fob.
All the best, Peter.
700/900/90 Register Keeper,
Volvo Owners Club (UK).