ALARM SYSTEM AND HORN
DESCRIPTION AND OPERATION 86-4-11
Central door locking switches
A momentary action switch mounted on the fascia allows for central door locking/unlocking from within the vehicle.
The switch is mounted adjacent to the clock.
Input/Output
The input from the central door locking/unlocking switch to the BCU is either zero volts or an open circuit. Zero volts
indicates the switch is closed. An open circuit indicates that the switch is open. When the BCU sees an open circuit,
it pulls the input high internally.
The central door locking/unlocking switch has a dedicated signal input to the BCU. This allows the BCU to identify
the lock/ unlock request.
TestBook provides the ability to monitor the real time state of the central door locking/ unlocking switch.
Handset and receiver
The handset is incorporated in the key. It uses coded radio frequency signals to lock, unlock and super lock the vehicle
remotely with a range of up to 10 metres (33 ft). The handset also mobilises the vehicle by transmitting a
remobilisation signal when the handset is within range of the passive remobilisation exciter coil.
The receiver is located in front of the rear sunroof beneath the headlining. Signals transmitted by the handset are
distributed to the BCU via the receiver.
Input/Output
The BCU supplies the receiver with a 12 volts power supply. On receiving a valid signal from the handset, the receiver
transmits a 1000 baud signal to the BCU to allow locking/unlocking of the vehicle.
TestBook provides the ability to monitor the real time state of the remote receiver.