Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 104

10C-1 Immobilizer Control System: 

Control Systems

Immobilizer Control System

Precautions

Precautions in Diagnosing Troubles

S5JB0EA300001

• 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 in related manual” 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 in Section 1A”) Therefore, handle CAN communication lines with care referring to “Precaution for CAN 
Communication System in Section 00 in related manual”.

Immobilizer Control System:  10C-2

Schematic and Routing Diagram

Immobilizer Control System Wiring Circuit Diagram

S5JB0EA302001

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 in related manual”.

 

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

I5JB0DA30001-02

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)

10C-3 Immobilizer Control System: 

Diagnostic Information and Procedures

Diagnostic Trouble Code (DTC) Table

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ECM

NOTE
ECM detects diagnostic trouble code (DTC). Immobilizer control module (ICM) does not.

 

NOTE
If any DTC other than the above DTCs is detected, refer to “DTC Table in Section 1A”.

 

DTC P1614: Transponder Response Error

S5JB0EA304008

Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram”

Detecting Condition and Trouble Area

DTC No.

Detecting Item

Detecting Condition

Immobilizer 

Indicator 

Lamp

P1614 Transponder response error

Transponder code in the transponder built in 
the ignition key cannot be read through 
immobilizer control module (ICM).

Flash

P1615

Steering lock unit communication error (for 
vehicle with keyless start system)

• While registering the transponder code in 

the transponder built in the ignition key in 
ECM, the keyless start control module sent 
a signal to ECM indicating that the ID code 
could not be registered.

• The ID code could not be registered in the 

keyless start control module or ECM.

Flash

P1616

Unregistered keyless start control module (for 
vehicle with keyless start system)

ECM detects different ID codes registered in 
ECM and keyless start system.

Flash

P1618

Keyless start control module CAN 
communication error (for vehicle with keyless 
start system)

Reception error of communication data for 
keyless start control module is detected for 
longer than specified time continuously.

Flash

P1621 Immobilizer communication line error

Communication error between immobilizer 
control module (ICM) and ECM is detected by 
ECM.

Flash

P1622 EEPROM read/write error

EEPROM in ECM is corrupted.

Flash

P1623 Unregistered transponder

Transponder code in the transponder built in 
the ignition key is invalid.

Flash

P1625 Immobilizer antenna error

Immobilizer control module (ICM) is faulty.

Flash

P1636 Immobilizer information registration failure

Communication error between ECM and 
BCM is detected by ECM.

No operation

P1638 Immobilizer information mismatched

• Communication error between ECM and 

BCM is detected by ECM.

• Wrong ECM or BCM is used.

No operation

Detecting Condition

Trouble Area

Transponder code in the transponder built in the ignition 
key cannot be read through immobilizer control module 
(ICM).

• Use of the ignition key without the transponder
• Use of the unregistered ignition key
• Corruption of the transponder in the ignition key
• Immobilizer control module (ICM) faulty
• ECM faulty

Immobilizer Control System:  10C-4

Troubleshooting

Step

Action

Yes

No

1

Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code 

(DTC) Clearance in related manual”.

2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic 

Trouble Code (DTC) Check in related manual”.

Is DTC P1614 still detected?

Go to Step 2.

The troubleshooting is 
completed.

2

Diagnostic Trouble Code (DTC) check
1) Check if any DTC other than P1614 is detected referring 

to “Diagnostic Trouble Code (DTC) Check in related 
manual”.

Is any DTC other than P1614 is detected?

Perform troubleshooting 
referring to the 
corresponding flowchart 
in this section, and then 
go to Step 3.

Go to Step 3.

3

Registration of the ignition key in use with ECM and 
Diagnostic Trouble Code (DTC) Check
1) There is a possibility that the unregistered ignition key is 

used. Therefore, register the transponder code in the 
transponder in the ignition key with ECM referring to 
“Registration of the Ignition Key in related manual”.

2) Check if DTC P1614 is detected referring to “Diagnostic 

Trouble Code (DTC) Check in related manual”.

Is DTC P1614 detected?

Go to Step 4.

The troubleshooting is 
completed.

4

Registration of the new ignition key with ECM and 
Diagnostic Trouble Code (DTC) check
1) The transponder in the ignition key is corrupted or the 

ignition key without the transponder is used. Therefore, 
prepare the new ignition key.

2) Register the transponder code in the transponder in the 

new ignition key with ECM referring to “Registration of 
the Ignition Key in related manual”.

3) Check if that DTC P1614 is detected referring to 

“Diagnostic Trouble Code (DTC) Check in related 
manual”.

Is DTC P1614 detected?

Go to Step 5.

The troubleshooting is 
completed.

5

Immobilizer control module (ICM) check
1) Check immobilizer control module (ICM) referring to 

“Inspection of Immobilizer Control Module (ICM) and Its 
Circuit in related manual”.

Is immobilizer control module (ICM) normal?

Replace ECM with new 
one referring to “Engine 
Control Module (ECM) 
Removal and 
Installation in Section 
1C in related manual”, 
and then perform 
“Procedure after ECM 
Replacement in related 
manual”.

Replace immobilizer 
control module (ICM) 
with new one referring 
to “Immobilizer Control 
Module (ICM) Removal 
and Installation in 
related manual”.