Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 548

10C-53 Immobilizer Control System: For Diesel Engine Model

Inspection of Immobilizer Control Module (ICM) and Its Circuit

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ICM and its circuit can be checked at ICM wiring connector by measuring voltage.

CAUTION

!

 

ICM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ICM with 
connector disconnected from it.

 

Voltage Check

1) Remove ICM (1) from steering lock assembly or steering lock unit referring to “Immobilizer Control Module (ICM) 

Removal and Installation: For Diesel Engine Model”.

2) Connect ICM connector (2) to ICM.

5

Check for communication circuit between steering lock 
unit and keyless start control module
1) With the ignition switch at OFF position, disconnect 

steering lock unit connector and keyless start control 
module connector.

2) Check for proper connection at terminals and wires of 

each connector referring to “Intermittent and Poor 
Connection Inspection in Section 00”.

3) If OK, check for open, short, and high resistance in each 

circuit between steering lock unit and keyless start 
control module. Refer to Step 2 in “DTC No. 11: 
Communication Error with Steering Lock Unit in Section 
10E”.

Is each circuit in good condition?

Go to Step 6.

Repair malfunction part 
and recheck.

6

Steering lock unit power supply check
1) Connect keyless start control module connector.
2) With ignition switch at ON position, check power supply 

terminal voltage of steering lock unit connector. Refer to 
“Keyless Start Control Module Power and Ground Circuit 
Check in Section 10E”.

Is voltage 4 – 6 V?

Replace steering lock 
unit and recheck.

Substitute a known-
good keyless start 
control module and 
recheck. If DTC B1718 
is still detected, 
substitute a known-
good ECM and recheck.

Step

Action

Yes

No

Immobilizer Control System: For Diesel Engine Model 10C-54

3) Check voltage at each terminal.

NOTE
As each terminal voltage is affected by the battery voltage, confirm that it is 12 V or more when the 
ignition switch is turned to ON position.

 

3. ICM connector (harness side view)

1

2

3

3

1

2

4

5

6

7

8

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Connector Terminal

Circuit

Normal Voltage

Condition

G24

1

BLK/
RED

Illumination ring ground

0 V

• Ignition key not inserted to the key cylinder
• Door opened

0 V

→12 V

• Ignition switch at OFF position
• From the time door is closed to the time 

interior light faded out completely (As the 
interior light fades out, the voltage 
increases)

0 V

→12 V

• Door closed
• From the ignition switch is turned ON to the 

time interior light completely faded out (As 
the interior light fades out, the voltage 
increases)

2 WHT

Illumination ring power 
supply

About 12 V

Ignition switch at ON position

About 12 V

Ignition switch at OFF position

3

PPL/
WHT

Serial communication line 
of data link connector

About 6 V

Ignition switch at ON position, scan tool 
connected

About 7 V

Ignition switch at ON position, scan tool 
disconnected

4

BLK/
WHT

Ignition switch signal

About 12 V

Ignition switch at ON position

About 0 V

Ignition switch at OFF position

5 WHT

CAN communication line 
(low) for each control 
module

See the reference 
waveform

—

6 RED

CAN communication line 
(high) for each control 
module

See the reference 
waveform

—

7 BLK

Ground for ICM

About 0 V

Constantly

8

BLU/
BLK

Power source

About 12 V

Constantly

10C-55 Immobilizer Control System: For Diesel Engine Model

Reference Waveform

NOTE
CAN communication line signal is pulse. Pulse signal displayed with a regular frequency which varies 
depending on vehicle condition.

 

1. CAN communication line signal (High)
2. CAN communication line signal (Low)

Measurement terminals

CH1: G24-5 to G24-7
CH2: G24-6 to G24-7

Oscilloscope settings

CH1: 1 V/DIV
CH2: 1 V/DIV
TIME: 40 

µs/DIV

Measurement condition

Ignition switch at ON position.

I5JB0BA30006-01

Immobilizer Control System: For Diesel Engine Model 10C-56

Repair Instructions

Immobilizer Control Module (ICM) Removal and 
Installation

S6JB0AA326001

Removal

1) Disconnect negative (–) cable from battery.
2) Disable air bag system referring to “Disabling Air 

Bag System in Section 8B”.

3) Remove driver air bag (inflator) module referring to 

“Driver Air Bag (Inflator) Module Removal and 
Installation in Section 8B”.

4) Remove steering wheel referring to “Steering Wheel 

Removal and Installation in Section 6B”.

5) Remove steering column lower and upper covers.
6) Disconnect connector (1) from ICM (2).
7) Remove a screw (3) from ICM.

8) Remove ICM from steering lock assembly.

NOTE
The antenna part of ICM is fragile. Therefore, 
do not add strong power to the part or twist 
the part.

 

Installation
Reverse the removal procedure noting the following.
• After ICM replaced, perform “Procedure after 

Immobilizer Control Module (ICM) Replacement: For 
Diesel Engine Model”.

Registration of the Ignition Key

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To finish the registration of the ignition key, the 
transponder code memorized in the transponder built in 
the ignition key has to be registered with ICM. To register 
the transponder code with ICM, perform “Register Ig 
Key” mode of SUZUKI scan tool referring to “SUZUKI 
scan tool Operator’s Manual”.

NOTE

• A maximum of four transponder codes can 

be registered with ICM.

• At an early part of the registration process, 

all transponder codes of the ignition keys 
in use already registered with ICM are 
cleared. Therefore, before starting the 
registration, prepare all ignition keys in 
use in addition to the new ignition key(s) to 
be registered with ICM.

 

Procedure after ECM Replacement

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After ECM is replaced with new one or used one, the key 
verification code stored in the ECM has to be registered 
with immobilizer control system. To register key 
verification code stored in the ECM with immobilizer 
control system, perform “Replace ECM” mode of 
SUZUKI scan tool referring to “SUZUKI scan tool 
Operator’s Manual”.

Procedure after Immobilizer Control Module 
(ICM) Replacement

S6JB0AA326004

After ICM replaced with new one or used one, 
transponder code memorized in the transponder built in 
the ignition key in use has to be registered with ICM and 
then, key verification code stored in the ICM has to be 
registered with immobilizer control system. To register 
ignition key in use with ICM and to register verification 
code stored in the ICM with immobilizer control system, 
perform “Replace Immobilizer Module” mode of SUZUKI 
scan tool referring to “SUZUKI scan tool Operator's 
Manual”.

NOTE

• A maximum of four transponder codes can 

be registered with ICM.

• At an early part of the registration process, 

all transponder codes of the ignition keys 
in use already registered with ICM are 
cleared. Therefore, before starting the 
registration, prepare all ignition keys in 
use in addition to the new ignition key(s) to 
be registered with ICM.

 

2

3

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