Inspection of ICM and Its Circuit: Notes

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

Remove ICM (1) from steering lock assembly or steering lock unit referring to ICM REMOVAL AND INSTALLATION .
Connect ICM connector (2) to ICM.
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.

Fig 1: Checking Voltage Between ICM Connector Terminal

Courtesy of SUZUKI OF AMERICA CORP.

VOLTAGE SPECIFICATION

Terminal	Circuit	Normal Voltage	Condition
G17-1	Power supply	About 12.0 V	Ignition switch at ON position
G17-1	Power supply	0.0 V	Ignition switch at OFF position
G17-2	Ground	Below 0.3 V	Ignition switch at ON position
G17-3	Serial communication line	Below 0.5 V ↑ ↓ Above 10.0 V	See the REFERENCE WAVEFORM
G17-4	Clock line	Below 0.5 V ↑ ↓ Above 10.0 V	See the REFERENCE WAVEFORM
G17-5	Illumination ring control (if equipped)	0.0 V	Ignition key not inserted to the key cylinder Door opened
		0.0 V ↔ 12.0 V	Ignition key at OFF position From the time door is closed to the time interior light faded out completely (As the interior light fades out, the voltage increases.)
		0.0 V ↔ 12.0 V	Door closed From the ignition switch is turned ON to the time interior light is completely faded out (As the interior light fades out, the voltage increases.)
G17-6	Illumination ring power supply (if equipped)	About 12.0 V	-