Inspection Of Immobilizer Control Module (Icm) And Its Circuit - Suzuki Swift Sport 2004 Service & Repair Manual

Step
5 CAN communication circuit check
1) Disconnect connectors from ECM, BCM and ABS
control module.
2) Check CAN communication circuit for open, short and
high resistance.
• Between ECM and ABS control module
• Between BCM and ABS control module
Is each CAN communication circuit in good condition?
6 Replacement of BCM
1) Replace BCM with new one referring to "BCM (Included
in Junction Block Assembly) Removal and Installation in
Section 10B".
2) Check ECM for DTC referring to "Diagnostic Trouble
Code (DTC) Check".
Is DTC P1638 still detected?

Inspection of Immobilizer Control Module (ICM) and Its Circuit

ICM and its circuit can be checked at ICM wiring connector by measuring voltage.
CAUTION
!
ICM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ICM with
connector disconnected from it.
Voltage Check
1) Remove ICM (1) from steering lock assembly or steering lock unit referring to "Immobilizer Control Module (ICM)
Removal and Installation".
2) Connect ICM connector (2) to ICM.
3) Check voltage at each terminal.
NOTE
As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when the
ignition switch is turned to ON position.
Action
3. ICM connector (harness side view)
Immobilizer Control System:
Yes
Go to Step 6.
Substitute a known-
good ECM and recheck.
1
2
3
3 2 1
4
G24
10C-16
No
Repair circuit.
BCM faulty.
S7RS0BA304018
I4RS0BA30005-02