Suzuki GRAND VITARA JB416 Service Manual page 456

10C-18 Immobilizer Control System:
Step
6 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 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
in related manual".
2) Check ECM for DTC referring to "Diagnostic Trouble
Code (DTC) Check: in related manual".
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.