Suzuki Grand Vitara JB416 / JB420. Manual — part 422

10C-18 Immobilizer Control System:

DTC P1622: EEPROM Error

S5JB0AA304008

Detecting Condition and Trouble Area

Troubleshooting

1) Clear DTC(s) referring to “Diagnostic Trouble Code (DTC) Clearance”.
2) Turn the ignition switch to OFF position.
3) Check if DTC P1622 is still detected referring to “Diagnostic Trouble Code (DTC) Check”. 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”.
5) Perform “Procedure after ECM Replacement”.

DTC P1623: Unregistered Transponder

S5JB0AA304009

Detecting Condition and Trouble Area

Troubleshooting

14 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”.

Step

Action

Yes

No

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

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 P1623 still detected?

Go to Step 2.

The troubleshooting is
completed.

2

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.

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”.

2) Check if that DTC P1623 is detected referring to

“Diagnostic Trouble Code (DTC) Check”.

Is DTC P1623 detected?

Go to Step 4.

The troubleshooting is
completed.

Immobilizer Control System: 10C-19

DTC P1625: Immobilizer Antenna Error

S5JB0AA304010

Detecting Condition and Trouble Area

Troubleshooting

4

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

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

Is immobilizer controller assembly 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”.

Step

Action

Yes

No

Detecting Condition

Trouble Area

Immobilizer control module (ICM) is faulty.

• Immobilizer 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 P1625 still detected?

Go to Step 2.

The troubleshooting is
completed.

2

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”.

2) Check if DTC P1625 is still detected referring to

“Diagnostic Trouble Code (DTC) Check”.

Is DTC P1625 still detected?

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

The troubleshooting is
completed.

10C-20 Immobilizer Control System:

DTC P1636: Immobilizer Information Registration Failure

S5JB0AA304017

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
• BCM faulty
• ABS 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 P1636 still detected?

Go to Step 2.

The troubleshooting is
completed.

2

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.

3

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

10B”.

Is any DTC detected?

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

Go to Step 4.

4

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

and Installation in Section 10B”.

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check”.

Is DTC P1636 still detected?

Go to Step 5.

The troubleshooting is
completed.

5

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

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

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check”.

Is DTC P1636 still detected?

Recheck CAN
communication wire
circuits and poor
connection at ECM,
ABS and BCM
connectors.

The troubleshooting is
completed.

Immobilizer Control System: 10C-21

DTC P1638: Immobilizer Information Mismatched

S5JB0AA304018

DTC Detecting Condition and Trouble Area

Troubleshooting

Detecting Condition

Trouble Area

• The immobilizer control system information in ECM and

the one in BCM does not match.

• The registration of the immobilizer control system

information in ECM is failed.

• Use of the wrong ECM
• CAN communication wire circuits faulty
• BCM faulty
• ABS 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 P1638 still detected?

Go to Step 2.

The troubleshooting is
completed.

2

Diagnostic Trouble Code (DTC) confirmation
1) Disconnect negative (–) cable from battery for more than

5 seconds.

2) Connect negative (–) cable to battery.
3) Check if any DTC is detected referring to “Diagnostic

Trouble Code (DTC) Check”.

Is DTC P1638 still detected?

Go to Step 3.

The troubleshooting is
completed.

3

Check ECM specification
1) Check ECM part number to see if ECM is applicable to

the vehicle in service.

Is a correct ECM used for the vehicle in service?

Go to Step 2.

Replace ECM with the
correct one and recheck
if DTC P1638 is still
detected by ECM.

4

Diagnostic Trouble Code (DTC) check in ECM

Is any DTC other than P1638 detected in Step 1?

Perform the
troubleshooting
referring to the
corresponding
flowchart.

Go to Step 3.

5

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

10B”.

Is any DTC detected?

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

Go to Step 5.

6

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

and Installation in Section 10B”.

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check”.

Is DTC P1638 still detected?

Go to Step 6.

The troubleshooting is
completed.

7

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

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

2) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check”.

Is DTC P1638 still detected?

Recheck CAN
communication wire
circuits and poor
connection at ECM,
ABS and BCM
connectors.

The troubleshooting is
completed.