Suzuki 2006 SX4, Service Manual

Page: 1441 / 1478

Immobilizer Control System: 10C-16
Inspection of ICM and Its Circuit
S6RW0CA304018
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 “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.
6 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?
Go to Step 7. Repair circuit.
7 Replacement of BCM
1) Replace BCM with new one referring to “BCM (Included
in Junction Block) Removal and Installation in Section
10B”.
2) Check ECM for DTC referring to “DTC Check”.
Is DTC P1638 still detected?
Substitute a known-
good ECM and recheck. BCM faulty.
Step Action Yes No
1 2 3 4
1
2
5 6
[A]
I6RW0BA30003-01
[A]: ICM connector (harness side view)