Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 535

10C-1 Immobilizer Control System: For Petrol Engine Model

Control Systems

Immobilizer Control System

For Petrol Engine Model

Precautions

Precautions in Diagnosing Troubles

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• Before confirming the diagnostic trouble code (DTC), do not disconnect connector from ECM, battery cable from 

battery, ground wire harness, or main fuse. Such disconnection will erase DTC stored in ECM.

• DTC stored in ECM memory can be checked as well as cleared by using SUZUKI scan tool. Before using SUZUKI 

scan tool, read its operator’s manual carefully to know how to use it and what functions are available.

• Be sure to read “Precautions for Electrical Circuit Service in Section 00” before inspection.
• Communication of ECM, BCM, combination meter, TCM, keyless start control module (if equipped), ABS/ESP

® 

control module, 4WD control module (if equipped), Steering angle sensor (if equipped) and DLC is established by 
CAN (Computer Area Network). (For more detail of CAN communication, refer to “CAN Communication System 
Description: For Petrol Engine Model in Section 1A”) Therefore, handle CAN communication lines with care 
referring to “Precaution for CAN Communication System in Section 00”.

Precaution in Replacing ECM

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• If ECM is replaced with new or used one without the 

functionality for the immobilizer control system, the 
engine will not be started. In case of the above, check 
if the newly installed ECM has the functionality for the 
immobilizer control system referring to its part 
number.

• After ECM is replaced with new one or used one, the 

transponder code in the transponder built in the 
ignition key has to be registered with ECM. Or, the 
engine cannot be started up. For the registration 
procedure, refer to “Procedure after ECM 
Replacement: For Petrol Engine Model”.

Precautions in Handling Immobilizer Control 
System

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• Do not turn ON ignition switch with ignition key in 

contact with another one or quite close to another 
one. Or, the immobilizer control system may detect 
some abnormal condition and prevent the engine from 
starting.

• Do not turn ON ignition switch by using ignition key 

with any type of metal (1) wrapped its grip or in 
contact with it. Or, the immobilizer control system may 
detect some abnormal condition and prevent the 
engine from starting.

• Do not leave ignition key in a place where 

temperature is high. High temperature may cause 
damage to the transponder built in the ignition key.

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1

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I3RH0AA30003-01

Immobilizer Control System: For Petrol Engine Model 10C-2

• Do not turn ignition switch to ON position by bringing 

radio antenna close to coil antenna. Or, the 
immobilizer control system may detect some 
abnormal condition and prevent the engine from 
starting.

General Description

Immobilizer Control System Introduction

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The immobilizer control system is an anti-theft device that immobilizes the vehicle. It stops the engine from working 
and prevents the vehicle from being stolen. It mainly consists of the following components.
• Engine Control Module (ECM)
• Immobilizer control module (ICM) with the built-in coil antenna
• Ignition key with the built-in transponder
A code called the transponder code is memorized in the transponder. And, the code is registered with ECM. Basically, 
when the ignition switch is turned ON, ECM reads the code by the coil antenna. Then, if the code in transponder in the 
ignition key does not match with the one registered with ECM, ECM stops the operation of the fuel injection so as not 
to start up the engine and turns the immobilizer indicator lamp ON and OFF using CAN communication lines. (In 
addition to the above operation, ECM also turns the immobilizer indicator lamp ON and OFF when some trouble is 
detected in the keyless start system.)

On-Board Diagnostic System Description (Self-diagnosis Function)

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ECM diagnoses if there is any trouble with the immobilizer control system. The diagnostic information is stored as the 
diagnostic trouble code (DTC) in ECM. To read the diagnostic information, use SUZUKI scan tool referring to 
“Diagnostic Trouble Code (DTC) Check: For Petrol Engine Model”.
With the ignition switch turned ON (but the engine at stop) regardless of the condition of the engine and emission 
control system, ECM indicates whether there is any trouble with the immobilizer control system or not by either lighting 
ON or flashing ON and OFF the immobilizer indicator lamp.

Immobilizer indicator lamp lights ON:
No trouble exists in the immobilizer control system. (After starting up the engine, the lamp turns OFF.)

Immobilizer indicator lamp flashes ON and OFF:
There is some trouble in the immobilizer control system or in the keyless start system. Its diagnostic information is 
stored in ECM.

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10C-3 Immobilizer Control System: For Petrol Engine Model

Schematic and Routing Diagram

Immobilizer Control System Wiring Circuit Diagram

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NOTE
For more details about power supply and ground wire circuits for ECM, BCM, ABS/ESP

® control 

module, keyless start control module and combination meter, refer to “System Circuit Diagram in 
Section 9A”.

 

BLK/WHT

BLK

WHT/BLU

WHT/RED

12V

G24-1

G24-2

12V

5V

12V

12V

PNK/BLU

GRY/BLU

G24-4

G24-3

E23-11

E23-19

BLK

BLK/YEL

12V

E23-29   

WHT

PPL/WHT

E53-46 E53-42

E23-9 E23-17

WHT

RED

E53-13 E53-44

RED

WHT

RED

WHT

RED

WHT

G31-1

G31-3

G28-8

G28-10

G42-19

G42-18

G42-20 G42-29 G42-30

5V

ORN

BRN/YEL

BLK/YEL

G22-3 G22-7 G22-8

G28-13

PPL/RED

1

2

2

2

2

2

3

4

2

5

6

7

15

9

10

11

12

13

14

BLK

BLK/RED

G24-5

G24-6

14

E03-8

E03-10

E03-12 E03-6

8

19

1

2

3

4

G24

16

5

6

G31-2

G31-4

RED

WHT

WHT

RED

17

18

18

20

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1. Battery

6. Data link connector (DLC)

11. Keyless start control module

16. Immobilizer control module (ICM) connector 

(harness side view)

2. Fuse

7. ECM

12. Combination meter

17. To DLC

3. Ignition switch

8. ABS control module

13. From fuse

18. To BCM

4. Junction block assembly

9. Junction connector

14. BCM

19. To BCM and ABS/ESP

® control module

5. Immobilizer control 

module (ICM)

10. Steering lock unit

15. ESP

® control module (Vehicle equipped 

with ESP

® system)

20. To TCM, 4WD control module and steering 

angle sensor (if equipped)

Immobilizer Control System: For Petrol Engine Model 10C-4

Component Location

Immobilizer Control System Components Location

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1

2

3

4

5

6

7

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1. ECM

5. Ignition key without keyless entry system

2. Immobilizer indicator lamp

6. Ignition key with keyless start system

3. Immobilizer control module (ICM)

7. Transponder

4. Ignition key with keyless entry system