Suzuki Grand Vitara JB419. Service manual — part 182

Immobilizer Control System: 10C-18

Inspection of Immobilizer Control Module (ICM) and Its Circuit

S5JB0BA304018

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”.

2) Connect ICM connector (2) to ICM.
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

10C-19 Immobilizer Control System:

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

Immobilizer Control System: 10C-20

Reference Waveform

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

Repair Instructions

Immobilizer Control Module (ICM) Removal and
Installation

S5JB0BA306001

Removal

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

Bag System in Section 8B in related manual”.

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

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

4) Remove steering wheel referring to “Steering Wheel

Removal and Installation in Section 6B in related
manual”.

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.

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

2

3

1

I4RS0BA30007-03

10C-21 Immobilizer Control System:

Registration of the Ignition Key

S5JB0BA306002

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
Tech 2 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

S5JB0BA306003

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 Tech 2
Operator’s Manual”.

Procedure after Immobilizer Control Module
(ICM) Replacement

S5JB0BA306004

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 Tech 2 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.

Special Tools and Equipment

Special Tool

S5JB0BA308001

SUZUKI scan tool
—
This kit includes following
items. 1. Tech 2, 2. PCMCIA
card, 3. DLC cable, 4. SAE
16/19 adapter, 5. Cigarette
cable, 6. DLC loop back
adapter, 7. Battery power
cable, 8. RS232 cable, 9.
RS232 adapter, 10. RS232
loop back connector, 11.
Storage case, 12.) / )