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Home >> Lexus >> 2012 >> IS 250C Automatic Trans >> Repair and Diagnosis >> Electrical >> Starter >> Smart Access System With Push-Button Start (For Entry Function) (Diagnostics & Symptom Tests) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) >> Symptom Tests >> Entry Answer-back Buzzer does not Sound >> Description

Entry Answer-back Buzzer does not Sound: Description

The smart access system with push-button start uses the wireless door lock buzzer to perform various vehicle exterior warnings. When the conditions for each warning are met, the certification ECU (smart key ECU assembly) sends an entry lock/unlock signal to the main body ECU RH (cowl side junction block RH), and the wireless door lock buzzer sounds.