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Home >> Lexus >> 2003 >> IS 300 Base, Automatic >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System >> Component Tests >> Anti-Theft Siren Battery

Anti-Theft Siren Battery

  1. The internal battery is fully discharged.
  2. Set the system inside the vehicle.
  3. Disconnect the connector of the theft deterrent ECU in this condition, and sounds the siren for open detection.
  4. The siren battery is normal when the siren sounds for 30 seconds, stops, then after 5 seconds, sounds again.
  5. Replace the siren battery when the siren stops sounding before 30 seconds elapse because the battery life has run out.
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