Suzuki Grand Vitara JB627. Manual - part 424

10C-8 Immobilizer Control System: 

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

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

S6JB0BA304006

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

Troubleshooting

Step

Action

Yes

No

1

Immobilizer indicator light 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 light 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 
light 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 Light Remains ON after Engine Start

S6JB0BA304007

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

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 U0073: 
Control Module Communication Bus Off in Section 1A”.

Are wire circuits in good condition?

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

Repair the malfunctional 
wire circuit.

10C-10 Immobilizer Control System: 

DTC P1614: Transponder Response Error

S6JB0BA304008

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

Detecting Condition and Trouble Area

Troubleshooting

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.

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”.

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

Trouble Code (DTC) Check”.

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”.

3) Check if that DTC P1614 is detected referring to 

“Diagnostic Trouble Code (DTC) Check”.

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”.

Is immobilizer control module (ICM) normal?

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

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

Immobilizer Control System:  10C-11

DTC P1615: Steering Lock Unit Communication Error (for Vehicle with Keyless Start System)

S6JB0BA304009

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

Circuit Description
When the transponder code in the ignition key is registered in ECM, the remote controller ID code is registered in both 
ECM and keyless start control module at the same time. This DTC is detected only in case that the remote controller 
ID code cannot be registered in both ECM and keyless start control module when the transponder code in the ignition 
key is registered in ECM.

NOTE

• Perform the troubleshooting for DTC P1618 first if both DTC P1615 and P1618 are detected at the 

same time.

• After replacing ECM, be sure to register the transponder code in the ignition key with ECM referring 

to “Registration of the Ignition Key”. After replacing the keyless start control module of the vehicle 
equipped with the keyless start system, be sure to perform “Registration of the Ignition Key”.

 

Detecting Condition and Trouble Area

Troubleshooting

Detecting Condition

Trouble Area

• While registering the transponder code 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 of the transponder code in ECM was 
terminated forcibly.

• Wire circuits between steering lock unit and keyless 

start control unit open or shorted

• CAN communication wire circuits faulty
• Steering lock unit faulty
• Keyless start control module 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 P1615 still detected?

Go to Step 2.

The troubleshooting is 
completed.

2

Registration of the ignition key
1) Turn the ignition switch to OFF position.
2) Turn the ignition switch to ON position, and register the 

transponder code in the transponder in the ignition key 
with ECM referring to “Registration of the Ignition Key”.

Was it possible to register the ignition key (transponder 
code) in ECM?

The troubleshooting is 
completed.

Go to Step 3.

3

Diagnostic Trouble Code (DTC) check
1) Check if any DTC is detected referring to “Diagnostic 

Trouble Code (DTC) Check”.

Is any DTC detected?

Go to Step 4.

Replace ECM with a 
known-good one and 
recheck.

4

Diagnostic Trouble Code (DTC) check

Is any DTC other than P1615 detected in Step 3?

Perform the 
troubleshooting 
referring to the 
corresponding 
flowchart.

Go to Step 5.