Suzuki Wagon R Manual page 4058

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IMMOBILIZER CONTROL SYSTEM (Z10XEP / Z12XEP ENGINE MODELS) 8G4-3
Ignition Key (With Built-in Transponder)
Transponder is built in an ignition key housing. Each transponder
in the key has a FIX CODE (FC) for transmission and SECRET
KEY (SKC) for calculation. The FC will transmitted from the tran-
sponder via the coil antenna to immobilizer control module when
the ignition switch is turned to ON (II) position.
SKC is used for calculation with variable send from ECM.
SKC is preset (programmed) at factory shipment.
Immobilizer Control Module
Immobilizer control module is installed to steering column beside
ignition key switch. The coil antenna is installed to immobilizer
control module. It energizes transponder and transmits the FIX
CODE and data between transponder and immobilizer control
module.
As main functions, immobilizer control module checks matching
between FIX CODE transmitted from transponder and that regis-
tered in immobilizer control module (up to 5 different FIX CODE
can be registered).
Immobilizer control module controls serial communication
between scan tool and ECM.
Immobilizer control module has 3 different values as the follows.
• Password (PWD); for accessing to program by means of
scan tool.
• SECRET KEY (SKC); for ECM and transponder to calculate
with.
• FIX CODE (FC); for checking if transponder is the registered
one.
ECM
As main functions other than engine control, ECM (1) sends ran-
domized data to transponder and checks matching between a
response from transponder and the value calculated in ECM.
According to matching result of the FIX CODE and calculated
value, ECM decides to keep engine running or not.
ECM has 2 different values as follows.
• Password (PWD); for accessing to program immobilizer sys-
tem.
• SECRET KEY (SKC); Calculate with this value for permis-
sion of engine start.