Suzuki WagonR+ RB310 Service Manual page 2938

B+
Body ground
ECM ground
OBD-II serial data line
(K line of ISO 9141)
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 transponder
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 con-
trol 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.
D Password (PWD); for accessing to program by means of scan
tool.
D SECRET KEY (SKC); for ECM and transponder to calculate with.
D 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 re-
sponse from transponder and the value calculated in ECM.
According to matching result of the FIX CODE and calculated val-
ue, ECM decides to keep engine running or not.
ECM has 2 different values as follows.
D Password (PWD); for accessing to program immobilizer system.
D SECRET KEY (SKC); Calculate with this value for permission of
engine start.
DATA LINK CONNECTOR (DLC)
DLC is in compliance with SAE J1962 in its installation position, the
shape of connector and pin assignment.
OBD-II serial data line (K line of ISO 9141) is used for SUZUKI scan
tool to communicate with immobilizer control module, Airbag SDM,
ABS control module, etc.
IMMOBILIZER CONTROL SYSTEM 8G-3