Suzuki Grand Vitara JB416 / JB420. Manual - part 418

10C-2 Immobilizer Control System: 

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”.
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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Immobilizer Control System:  10C-3

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, 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

E23-13

E23-28

BLK

BLK/YEL

12V

E23-5

WHT

PPL/WHT

E03-8 E03-10

E23-4 E23-19

WHT

RED

E03-12 E03-6

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

E23

C37

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

3

4

18

19

5

6

7

10

11

17

20

47

46

49

50

51

21

22

52

16

25

9

24

14
29

55

57

54 53

59

60

58

2

26

27

28

15
30

56

48

32

31

34

35

36

37

40

42

39 38

44

45

43

41

33

1

12

13

23

8

1

2

3

4

5

6

7

8

9

10

11

17

16 15 14 13 12

22 21 20 19 18

G28

G31

1

2

3

4

7

8

9

10

11

14

15

16
36

34

35

24 23

21

22

28 27

25

26

37

39 38

40

18 17

13 12

19

20

1

2

3

4

G24

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

G44

E03

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

1

2

2

2

2

2

3

4

2

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

BLK

BLK/RED

G24-5

G24-6

5

6

14

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10C-4 Immobilizer Control System: 

Component Location

Immobilizer Control System Components Location

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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. BCM connector (harness side view)

3. Ignition switch

8. ABS control module

13. From fuse

18. ABS control module connector (harness side 

view)

4. Junction block assembly

9. Junction connector

14. BCM

19. Keyless start control module connector 

(harness side view)

5. Immobilizer control 

module (ICM)

10. Steering lock unit

15. Combination meter connector (harness 

side view)

20. ECM connectors (harness side view)

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

Immobilizer Control System:  10C-5

Diagnostic Information and Procedures

Immobilizer Control System Check

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Step

Action

Yes

No

1

Immobilizer indicator lamp ON check
1) Turn ignition switch to ON position using ignition key.

Does immobilizer indicator lamp (1) come on?

Go to Step 2.

Check if DTC P1636 
and/or P1638 are 
detected by ECM 
referring to “Diagnostic 
Trouble Code (DTC) 
Check”. If detected, 
perform the 
troubleshooting 
referring to the 
corresponding flowchart 
in this section. If not 
detected, go to 
“Immobilizer Indicator 
Lamp Does Not Come 
ON with Ignition Switch 
ON and Engine Stop”.

2

Immobilizer indicator lamp flash check

Does immobilizer indicator lamp flash on and off 
continuously in Step 1?

Check what DTC is 
detected by ECM 
referring to “Diagnostic 
Trouble Code (DTC) 
Check”. Then, perform 
the troubleshooting 
referring to the 
corresponding flowchart 
in this section.

Go to Step 3.

3

Engine start check
1) Start engine using ignition key.

Does engine start?

Go to Step 4.

Perform “Engine and 
Emission Control 
System Check in 
Section 1A”.

4

Immobilizer indicator lamp remain ON check
1) Check if immobilizer indicator lamp remains ON after 

engine start.

Does immobilizer indicator lamp remain ON after engine 
start?

Go to “Immobilizer 
Indicator Lamp 
Remains ON after 
Engine Start”.

Immobilizer control 
system is in good 
condition. Then, go to 
“Keyless Start System 
Check in Section 10E” 
for the vehicle with 
keyless start system.

1

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