Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 536

10C-5 Immobilizer Control System: For Petrol Engine Model

Diagnostic Information and Procedures

Immobilizer Control System Check

S6JB0AA314001

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: For Petrol 
Engine Model”. 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: 
For Petrol Engine 
Model”.

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: For Petrol 
Engine Model”. 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: For 
Petrol Engine Model 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: For Petrol 
Engine Model”.

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

Immobilizer Control System: For Petrol Engine Model 10C-6

Diagnostic Trouble Code (DTC) Check

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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

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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.

Diagnostic Trouble Code (DTC) Table

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ECM

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

 

(A)

1

I4RS0BA30003-03

(A)

1

I4RS0BA30003-03

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

10C-7 Immobilizer Control System: For Petrol Engine Model

NOTE
If any DTC other than the above DTCs is detected, refer to “DTC Table: For Petrol Engine Model 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.

 

INPUT YEAR
20**:  The year in which the transponder code in the transponder built in the ignition key is registered with ECM

INPUT MONTH
1 – 12:  The month in which the transponder code in the transponder built in the ignition key is registered with ECM

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

DTC No.

Detecting Item

Detecting Condition

Immobilizer 

Indicator 

Lamp

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

Immobilizer Control System: For Petrol Engine Model 10C-8

Immobilizer Indicator Lamp Does Not Come ON with Ignition Switch ON and Engine Stop

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Wiring Diagram
Refer to “Immobilizer Control System Wiring Circuit Diagram: For Petrol Engine Model”.

Circuit Description
When the ignition switch is turned ON, ECM transmits the indication ON signal to the combination meter to turn ON the 
immobilizer indicator lamp in case that there is not any problem with the immobilizer control system. Then, the 
combination meter turns ON the lamp. When the engine is started up, ECM transmits the indication OFF signal to the 
combination meter to turn OFF the lamp. Then, the combination meter turns OFF the immobilizer indicator lamp. 
However, in case that there is some trouble with the immobilizer control system, the immobilizer indicator lamp flashes 
ON and OFF when the ignition switch is turned ON.

Troubleshooting

Step

Action

Yes

No

1

Immobilizer indicator lamp power supply check
1) Turn the ignition switch to ON position.

Do other warning lights come ON?

Go to Step 2.

Go to Step 3.

2

Diagnostic Trouble Code (DTC) check
1) Check if DTC P1674, P1675, P1678 and/or P1685 are 

detected by ECM referring to “Diagnostic Trouble Code 
(DTC) Check: For Petrol Engine Model”.

Is any of them detected?

Perform the 
troubleshooting 
referring to the 
corresponding flowchart 
in Section 1A.

Replace combination 
meter with a known-
good one and recheck. 
If the immobilizer 
indicator lamp still 
remains OFF, replace 
ECM with a known-good 
one and recheck.

3

Fuse check
1) Turn the ignition switch to OFF position.
2) Check if any related fuse is blown.

Is any fuse blown?

Replace blown fuse, 
and then check for 
short.

Go to Step 4.

4

Combination meter power supply wire circuit check
1) Remove combination meter referring to “Combination 

Meter Removal and Installation in Section 9C”.

2) Check for proper connection at “G28-13” and “G28-15” 

wire terminals of combination meter connector.

3) If OK, turn the ignition switch to ON position and 

measure voltage between “G28-13” wire terminal of 
combination meter and vehicle body ground.

Is it 10 – 14 V?

Go to Step 5.

Repair open in power 
supply wire circuit.

5

Combination meter ground wire circuit check
1) Turn ignition switch OFF position.
2) Measure resistance between “G28-15” terminal of 

combination meter connector and vehicle body ground.

Is resistance 1 

Ω

 or less?

Replace combination 
meter with a know-good 
one and recheck. If the 
immobilizer indicator 
lamp still remains OFF, 
replace ECM with a 
known-good one and 
recheck.

Repair open or high 
resistance in ground 
wire circuit.