Suzuki GRAND VITARA User Manual

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.

Suzuki GRAND VITARA Specifications

General

Brand	Suzuki
Model	GRAND VITARA
Category	Automobile
Language	English