Suzuki Grand Vitara 2011 Manual page 2180

10C-25 Immobilizer Control System: For Petrol Engine Model
Step
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: For Petrol Engine Model".
Is DTC P1638 still detected?
7 Replacement of ECM
1) Replace ECM with new one referring to "Engine Control
Module (ECM) Removal and Installation: For Petrol
Engine Model in Section 1C".
2) Check ECM for DTC referring to "Diagnostic Trouble
Code (DTC) Check: For Petrol Engine Model".
Is DTC P1638 still detected?
Action Yes
Go to Step 6.
Recheck CAN
communication wire
circuits and poor
connection at ECM,
ABS/ESP® control
module and BCM
connectors.
No
The troubleshooting is
completed.
The troubleshooting is
completed.