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Immobilizer Control System: 10C-16

Inspection of Immobilizer Control Module (ICM) and Its Circuit

S7RS0BA304018

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.

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?

Go to Step 6. Repair circuit.

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?

Substitute a known-

good ECM and recheck.

BCM faulty.

Step Action Yes No

G24

I4RS0BA30005-02

3. ICM connector (harness side view)

Suzuki SWIFT 2005 User Manual

Questions and Answers: