Suzuki Grand Vitara JB416 / JB420 (ESP model). Service manual - part 107

10C-13 Immobilizer Control System:

11 Check for short to ground wire circuit in communication

wire circuit
1) With immobilizer control module (ICM) connector “G24”

and ECM connector “E23” disconnected, check
resistance between “G24-4” wire terminal at immobilizer
control module (ICM) connector and body ground.

Is resistance infinite?

Go to Step 12.

Repair short to ground
wire circuit in
communication wire
circuit.

12 Check for short to power circuit in communication wire

circuit
1) With immobilizer control module (ICM) connector “G24”

and ECM connector “E23” disconnected, turn the ignition
switch to ON position.

2) Check voltage between “G24-4” wire terminal at

immobilizer control module (ICM) connector and body
ground.

Is voltage 0 V?

Go to Step 13.

Repair short to power
supply wire circuit in
communication wire
circuit.

13 Check for short of communication wire circuit

1) With immobilizer control module (ICM) connector “G24”

and ECM connector “E23” disconnected, check
resistance between “G24-3” wire terminal and “G24-4”
wire terminal at immobilizer control module (ICM)
connector.

Is resistance infinite?

Go to Step 14.

Repair short of
communication wire
circuits.

14 Immobilizer control module (ICM) check

1) Check immobilizer control module (ICM) referring to

“Inspection of Immobilizer Control Module (ICM) and Its
Circuit in related manual”.

Is immobilizer control module (ICM) normal?

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

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

Step

Action

Yes

Immobilizer Control System: 10C-14

DTC P1622: EEPROM Error

S5JB0EA304013

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

Detecting Condition and Trouble Area

Troubleshooting

1) Clear DTC(s) referring to “Diagnostic Trouble Code (DTC) Clearance in related manual”.
2) Turn the ignition switch to OFF position.
3) Check if DTC P1622 is still detected referring to “Diagnostic Trouble Code (DTC) Check in related manual”. If still

detected, go to the next step. If not, the troubleshooting is completed.

4) Replace ECM with new one referring to “Engine Control Module (ECM) Removal and Installation in Section 1C in

related manual”.

5) Perform “Procedure after ECM Replacement in related manual”.

DTC P1623: Unregistered Transponder

S5JB0EA304014

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

Detecting Condition and Trouble Area

Troubleshooting

Detecting Condition

Trouble Area

EEPROM in ECM is corrupted.

Internal failure (EEPROM corruption) of ECM

Detecting Condition

Trouble Area

Transponder code in the transponder built in the ignition
key is invalid.

• Use of the unregistered ignition key
• Immobilizer control module (ICM) faulty
• ECM faulty

Step

Action

Yes

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

(DTC) Clearance in related manual”.

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

Trouble Code (DTC) Check in related manual”.

Is DTC P1623 still detected?

Go to Step 2.

The troubleshooting is
completed.

Diagnostic Trouble Code (DTC) check

Is any DTC other than P1623 is detected in Step 1?

Perform the
troubleshooting
referring to the
corresponding
flowchart, and then go
to Step 3.

Go to Step 3.

Registration of the unregistered ignition key with ECM
and Diagnostic Trouble Code (DTC) check
1) Register the transponder code in the transponder in the

unregistered ignition key with ECM referring to
“Registration of the Ignition Key in related manual”.

2) Check if that DTC P1623 is detected referring to

“Diagnostic Trouble Code (DTC) Check in related
manual”.

Is DTC P1623 detected?

Go to Step 4.

The troubleshooting is
completed.

10C-15 Immobilizer Control System:

DTC P1625: Immobilizer Antenna Error

S5JB0EA304015

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

Detecting Condition and Trouble Area

Troubleshooting

Immobilizer control module (ICM) check
1) Check immobilizer control module (ICM) referring to

“Inspection of Immobilizer Control Module (ICM) and Its
Circuit in related manual”.

Is immobilizer controller assembly normal?

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

Step

Action

Yes

Detecting Condition

Trouble Area

Immobilizer control module (ICM) is faulty.

• Immobilizer control module faulty
• ECM faulty

Step

Action

Yes

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

(DTC) Clearance in related manual”.

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

Trouble Code (DTC) Check in related manual”.

Is DTC P1625 still detected?

Go to Step 2.

The troubleshooting is
completed.

Immobilizer control module (ICM) replacement and
Diagnostic Trouble Code (DTC) check
1) Replace immobilizer control module (ICM) referring to

“Immobilizer Control Module (ICM) Removal and
Installation in related manual”.

2) Check if DTC P1625 is still detected referring to

“Diagnostic Trouble Code (DTC) Check in related
manual”.

Is DTC P1625 still detected?

The troubleshooting is
completed.

Immobilizer Control System: 10C-16

DTC P1636: Immobilizer Information Registration Failure

S5JB0EA304016

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

DTC Detecting Condition and Trouble Area

Troubleshooting

Detecting Condition

Trouble Area

The registration of the immobilizer control system
information in ECM is failed.

• CAN communication wire circuits faulty
• Steering angle sensor (if equipped) faulty
• Keyless start control module (if equipped) faulty
• 4WD control module (if equipped) faulty
• TCM (if equipped) faulty
• BCM faulty
• ABS/ESP

® control module faulty

• Combination meter faulty
• ECM faulty

Step

Action

Yes

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

(DTC) Clearance in related manual”.

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

Trouble Code (DTC) Check in related manual”.

Is DTC P1636 still detected?

Go to Step 2.

The troubleshooting is
completed.

Diagnostic Trouble Code (DTC) check in ECM

Is any DTC other than P1636 detected in Step 1?

Perform the
troubleshooting
referring to the
corresponding
flowchart.

Go to Step 3.

Diagnostic Trouble Code (DTC) check in BCM
1) Check BCM for DTC referring to “DTC Check in Section

10B in related manual”.

Is any DTC detected?

Perform the
troubleshooting
referring to the
corresponding flowchart
in Section 10B.

Go to Step 4.

Replacement of BCM
1) Replace BCM with new one referring to “BCM Removal

and Installation in Section 10B in related manual”.

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check in related manual”.

Is DTC P1636 still detected?

Go to Step 5.

The troubleshooting is
completed.

Replacement of ECM
1) Replace ECM with new one referring to “Engine Control

Module (ECM) Removal and Installation in Section 1C in
related manual”.

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check in related manual”.

Is DTC P1636 still detected?

Recheck CAN
communication wire
circuits and poor
connection at ECM,
ABS/ESP

® control

module and BCM
connectors.

The troubleshooting is
completed.

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