Suzuki Grand Vitara JB416 / JB420. Manual - part 419

10C-6 Immobilizer Control System: 

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 remote 
controller ID code could not be registered.

• The remote controller ID code could not be 

registered in the keyless start control 
module or ECM. And, the registration 
procedure of the transponder code in the 
transponder built in the ignition key was 
terminated forcibly.

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

Immobilizer Control System:  10C-7

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.

 

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

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

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

10C-8 Immobilizer Control System: 

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”.

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”.

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.

Immobilizer Control System:  10C-9

Immobilizer Indicator Lamp Remains ON after Engine Start

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

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

DTC P1614: Transponder Response Error

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Detecting Condition and Trouble Area

Troubleshooting

Step

Action

Yes

No

1

Diagnostic Trouble Code (DTC) check
1) Start engine.
2) Check if any DTC is detected by ECM referring to 

“Diagnostic Trouble Code (DTC) Check”.

Is any DTC detected?

Go to “Immobilizer 
Control System Check”.

Go to Step 2.

2

CAN communication wire circuits check
1) Check CAN communication wire circuits between 

combination meter and ECM referring to “DTC P1674: 
CAN Communication (Bus Off Error) in Section 1A”.

Are wire circuits in good condition?

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

Repair the malfunctional 
wire circuit.

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

Step

Action

Yes

No

1

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

(DTC) Clearance”.

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

Trouble Code (DTC) Check”.

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”.

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.