Dtc P1638: Immobilizer Information Mismatched - Suzuki GRAND VITARA Owner's Manual

DTC P1638: Immobilizer Information Mismatched

DTC Detecting Condition and Trouble Area
Detecting Condition
• 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.
Troubleshooting
Step
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?
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?
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?
4 Diagnostic Trouble Code (DTC) check in ECM
Is any DTC other than P1638 detected in Step 1?
5 Diagnostic Trouble Code (DTC) check in BCM
1) Check BCM for DTC referring to "DTC Check: in
Section 10B".
Is any DTC detected?
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?
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?
Action
Immobilizer Control System:
Trouble Area
• Use of the wrong ECM
• CAN communication wire circuits faulty
• BCM faulty
• ABS faulty
• ECM faulty
Yes
Go to Step 2.
Go to Step 3.
Go to Step 2.
Perform the
troubleshooting
referring to the
corresponding
flowchart.
Perform the
troubleshooting
referring to the
corresponding flowchart
in Section 10B.
Go to Step 6.
Recheck CAN
communication wire
circuits and poor
connection at ECM,
ABS and BCM
connectors.
10C-21
S5JB0AA304018
No
The troubleshooting is
completed.
The troubleshooting is
completed.
Replace ECM with the
correct one and recheck
if DTC P1638 is still
detected by ECM.
Go to Step 3.
Go to Step 5.
The troubleshooting is
completed.
The troubleshooting is
completed.