Suzuki Wagon R Manual page 4057

8G4-2 IMMOBILIZER CONTROL SYSTEM (Z10XEP / Z12XEP ENGINE MODELS)
Components
The immobilizer control system designed to prevent vehicle burglar and it consists of following components.
• Engine control module (ECM)
• Immobilizer control module (including coil antenna)
• Ignition key with built-in transponder
Operations
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
BLK/YEL
2
1
1. Battery
2. Fuse
3. Ignition switch
General Description
5
BLK/RED
4
3
6
BLK/RED
BLK/WHT
4. Junction box
5. Main relay
6. SVS lamp
7
G21-49
G21-33
BLU/BLK G21-19
PPL/WHT G21-29
G21-51
G21-2
WHT
8
G17-7
G17-5
G17-2
PPL/WHT
WHT/BLU G17-9
9
G09-16
WHT/BLU
G09-5
BRN
7. ECM
8. Immobilizer Control Module
9. Data Link Connector (DLC)
BLK
G17-4
G17-6
BLK
WHT/RED
G09-7
G09-4