Lexus IS300

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Disconnect the solenoid connector. Using an ohmmeter, measure the resistance between terminals. See Fig 1. Resistance should be 12-17 ohms. If resistance value is not as specified, replace the solenoid. See KEY INTERLOCK SOLENOID under REMOVAL & INSTALLATION.
Momentarily apply battery positive voltage to terminal KLS+ and ground terminal KLS-. See Fig 1. Ensure an operating noise can be heard from the solenoid. If the solenoid does not operate, replace the solenoid. See KEY INTERLOCK SOLENOID under REMOVAL & INSTALLATION.

Fig 1: Measuring Resistance Of Key Interlock Solenoid (Lexus IS300)