Suzuki WagonR+ RB310 Service Manual page 2937

8G-2 IMMOBILIZER CONTROL SYSTEM
COMPONENTS
The immobilizer control system designed to prevent vehicle burglar and it consists of following components.
D Engine control module (ECM)
D Immobilizer control module (including coil antenna)
D Ignition key with built-in transponder
Operation of this system is as follows.
1. Each ignition key has its FIX CODE (FC) stored in memory. When the ignition switch is turned to ON (II) position,
immobilizer control module tries to read the FC through the coil antenna built in immobilizer control module at
ignition key switch.
2. Immobilizer control module compares FC read in step 1 and that registered in immobilizer control module and
checks if they match.
3. ECM sends variable (generated randomly) to transponder via immobilizer control module and calculates it with
SECRET KEY (SKC) stored in memory according to specified algorithm.
On the other hand, transponder also calculates received variable with SKC stored in memory by means of same
algorithm and sends back to ECM.
4. Only when it is confirmed that ECM/transponder calculated values match, ECM keeps running engine.
If 2 calculated values did not match, ECM stops operation of injectors and ignitor to stop engine in about 1.8
seconds at the first time, after the second time ECM do not let engine start. And so it does when FIX CODEs
in step 2 do not match.
WIRING CIRCUIT
GENERAL DESCRIPTION
DOME
RADIO
5
IG IG
COIL METER
MIL
+
B
+
B
E22
1. ECM
2. Immobilizer control module
3. DLC connector