Suzuki Grand Vitara JB627. Manual - part 423

10C-4 Immobilizer Control System: 

Component Location

Immobilizer Control System Components Location

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1

2

3

4

5

6

7

I5JB0AA30001-01

1. ECM

5. Ignition key without keyless entry system

2. Immobilizer indicator light

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 light ON check
1) Turn ignition switch to ON position using ignition key.

Does immobilizer indicator light (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 
Light Does Not Come 
ON with Ignition Switch 
ON and Engine Stop”.

2

Immobilizer indicator light flash check

Does immobilizer indicator light 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 light remain ON check
1) Check if immobilizer indicator light remains ON after 

engine start.

Does immobilizer indicator light remain ON after engine 
start?

Go to “Immobilizer 
Indicator Light 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

I5JB0AA30004-01

10C-6 Immobilizer Control System: 

Diagnostic Trouble Code (DTC) Check

S6JB0BA304002

NOTE
To know how to use SUZUKI scan tool in 
detail, refer to its operator’s manual.

 

1) Turn the ignition switch to OFF position.
2) Connect SUZUKI scan tool to data link connector 

(DLC) (1) located under instrument panel at driver’s 
seat side.

Special tool
(A):  SUZUKI scan tool

3) Turn the ignition switch to ON position.
4) Check if any DTC is stored in ECM according to the 

instructions displayed on SUZUKI scan tool. 

5) After completing the check, turn ignition switch to 

OFF position, and then disconnect SUZUKI scan 
tool from DLC.

Diagnostic Trouble Code (DTC) Clearance

S6JB0BA304003

NOTE
To know how to use SUZUKI scan tool in 
detail, refer to its operator’s manual.

 

1) Turn the ignition switch to OFF position,
2) Connect SUZUKI scan tool to data link connector 

(DLC) (1) located under instrument panel at driver’s 
seat side.

Special tool
(A):  SUZUKI scan tool

1) Turn the ignition switch to ON position.
2) Clear DTC(s) according to the instructions displayed 

on SUZUKI scan tool.

3) After completing the clearance, turn the ignition 

switch to OFF position, and then disconnect SUZUKI 
scan tool from DLC.

(A)

1

I4RS0BA30003-03

(A)

1

I4RS0BA30003-03

Immobilizer Control System:  10C-7

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”.

 

Scan Tool Data

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The data listed below is the standard data obtained from the normal vehicle by using SUZUKI scan tool. Those are 
output from ECM. Use them as reference.

Scan Tool Data Definitions
NUMBER OF LEARNT KEY
0 – 4 PCS:  The number of the transponder code in the transponder built in the ignition key that is registered with ECM

NOTE
A maximum of four transponder codes can be registered with ECM. Therefore, the maximal value 
should be 4.

 

DTC No.

Detecting Item

Detecting Condition

Immobilizer 

Indicator 

Light

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

Scan Tool Data

Vehicle Condition

Normal Data

NUMBER OF LEARNT KEY

Ignition switch at ON position

0 – 4

INPUT YEAR

Ignition switch at ON position

2004 or later

INPUT MONTH

Ignition switch at ON position

1 – 12