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Inspection Of Icm And Its Circuit - Suzuki SX4 Service Manual

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10C-17 Immobilizer Control System:
Step
5
DTC check of BCM
1) Check BCM for DTC referring to "DTC Check in Section
10B".
Is DTC U0073, U0100, U0101, U0155 and/or U1144
detected?
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?
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?

Inspection of 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 "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
1
[A]: ICM connector (harness side view)
Yes
Go to applicable DTC
diag. flow.
Go to Step 7.
Substitute a known-
good ECM and recheck.
[A]
6
5
4
3
2
1
2
No
Go to Step 6.
Repair circuit.
BCM faulty.
S7RW0AA304018
I6RW0BA30003-01

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