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

I5JB0BA30005-02

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

S6JB0AA326002

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

S6JB0AA326003

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

1

I4RS0BA30007-03