Central Locking Interface

Some cheap car alarms do
not have a connection for the central locking system. However, in most
it should be possible to find a point in the alarm circuit which is high
when the alarm is activated and low when it is off. This signal can
then be used to drive this relay circuit to operate the central locking
system. The interface circuit converts each toggle of the alarm signal
to a brief pulse to operate the two relays which then are then connected
in parallel with appropriate contacts on the master solenoid in the
central locking system.

Central Locking Interface Circuit

Central Locking Interface Circuit Diagram

Author: Frank Keller – Copyright: Silicon Chip

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