engine oil RENAULT MEGANE 1997 X64 / 1.G Anti Theft System Manual

Downloaded from www.Manualslib.com manuals search engine 3.2
GENERAL OPERATION
Decoder Unit (BII)
This system is similar to many other immobilizer systems as it uses a transponder within
the head of the key to send its code to the immobilizer when interrogated via the immobi-
lizer ignition key barrel antenna. The code from the key is transferred to the Decoder Unit
which has the following functions:
• Decoding the key transponder signal, via the antenna coil
• Management of the engine immobilizer system by sending the received code to ei-
ther the EMS-ECM (Petrol engine) or the Coded Solenoid Valve (Fuel Cut-off valve
for diesel engines) to authorize the vehicle to be started
• Control of the immobilizer LED
• Central door locking functions (if fitted)
• Courtesy light control (part of central locking if fitted)

Multi Timer Unit (BMT)

The Multi Timer Unit has the same immobilizer function as the Decoder Unit above using
an ignition key with a transponder and an ignition key barrel antenna. The Multi Timer
Unit has the following functions (amongst others):
• Decoding the key transponder signal, via the antenna coil
• Management of the engine immobilizer system by sending the received code to ei-
ther the EMS-ECM (Petrol engine) or the Coded Solenoid Valve (Fuel Cut-off valve
for diesel engines) to authorize the vehicle to be started
• Control of the immobilizer LED
• Central door locking functions (if fitted)
• Courtesy light control (part of central locking if fitted)
Type 'I' Key Recognition Optional IR Rolling Code - Petrol/Diesel
This system can be used with or without an Infrared Remote Control, which would require
a separate control unit.
Type 'J' Coded Card instead of Key
This system is an immobilizer only, a separate system must be used to operate the cen-
tral locking, however, a Coded Card may contain a remote control transmitter for gaining
entry to the vehicle.

Downloaded from www.Manualslib.com manuals search engine 3.5
GENERAL OPERATION
All systems have the same end function, immobilizing the vehicle until the correct code is
presented to the immobiliser unit.
Type 'A' Infrared Remote Control Fixed Code - Petrol
This system uses a combined immobiliser and central door locking control unit with a re-
mote infrared transmitter contained in the plastic keyhead. The transmitted code is fixed
and when received by the control unit receiver it will generate a door open signal and si-
multaneously pass the code to the EMS-ECM. The EMS-ECM compares the received
code against a stored code and if verified it will allow the engine to be started. This type is
for petrol only vehicles and will allow up to seven keys to be used.
Type 'B' Infrared Remote Control Fixed Code - Diesel
This system uses a combined immobiliser and central door locking control unit with a re-
mote infrared transmitter contained in the plastic keyhead. The transmitted code is fixed
and when received by the control unit receiver it will generate a door open signal and si-
multaneously pass the code to the Coded Solenoid Valve. The Coded Solenoid Valve
compares the received code against a stored code and if verified it will allow the fuel to
the engine. This type is for diesel only vehicles and will allow up to four keys to be used.
Type 'C' Infrared Remote Control Rolling Code - Petrol
This system uses a combined immobiliser and central door locking control unit with a re-
mote infrared transmitter contained in the plastic keyhead. The transmitted code is rolling
to reduce the chances of the code being captured and used to enter the vehicle. The
code when received by the control unit receiver it will generate a door open signal and
simultaneously pass the code to the EMS-ECM. The EMS-ECM compares the received
code against a stored code and if verified it will allow the fuel to the engine. This type is
for petrol only vehicles and will allow up to seven keys to be used.
Type 'D' Key Recognition - No Infrared Remote - Petrol
This system uses key recognition only with no remote control of entry. A transponder in
the keyhead reacts to a transmitted signal from a coil wrapped around the ignition key
barrel. If the transponder code is the same as the stored code the EMS-ECM receives a
signal to allow the engine to run. This type is for petrol only vehicles and will allow up to
seven keys to be used.

Downloaded from www.Manualslib.com manuals search engine 3.6
GENERAL OPERATION
Type 'E' Infrared Remote Control Rolling Code - Diesel
This system uses a combined immobiliser and central door locking control unit with a re-
mote infrared transmitter contained in the plastic keyhead. The transmitted code is rolling
to reduce the chances of the code being captured and used to enter the vehicle. The
code when received by the control unit receiver it will generate a door open signal and
simultaneously pass the code to the Coded Solenoid Valve. The Coded Solenoid Valve
compares the received code against a stored code and if verified it will allow the fuel to
the engine. This type is for diesel only vehicles and will allow up to four seven keys to be
used dependent upon the type of shielding on the Coded Solenoid Valve.
Type 'F' Key Recognition - No Infrared Remote - Diesel
This system uses key recognition only with no remote control of entry. A transponder in
the keyhead reacts to a transmitted signal from a coil wrapped around the ignition key
barrel. If the transponder code is the same as the stored code the Coded Solenoid VAlve
receives a signal to allow the engine to run. This type is for diesel only vehicles and will
allow up to four or seven keys to be used depending upon the type of shielding on the
Coded Solenoid Valve.
Type 'G' Key Recognition + IR Rolling Code - 2 ECMs - Petrol/Diesel
This system has both Infrared Remote Control and Key Recognition but have a separate
control for each function. There is no interaction between the two controllers except thst
they share common 'K' & 'L' diagnostic lines to the DLC and the Electric Door Button has
an input to both to allow the code to be entered manually. This systems appears in both
petrol and diesel vehicles and up to seven keys can be used.
Type 'H' Key Recognition + IR Rolling Code - 2 ECMs - Petrol/Diesel
Types 'H' and 'G' are exactly similar in their functionality but Type 'H' has a single inte-
grated control unit.