Check operation of the horn.

• Standard:

• Measurement Condition	Specified Condition
  Battery positive (+) → Terminal 1	Horn sounds
  Battery negative (-) → Horn body

If the result is not as specified, replace the security horn assembly.

Remove the bolt and disconnect the security horn assembly.

Lexus IS250 IS220d GSE20 ALE20 THEFT DETERRENT

Apply MP grease to the sliding areas of the lock.

Measure the resistance according to the value(s) in the table below.

Using a clip remover, remove the 11 clips and cool air intake duct seal.

Lexus IS250 IS220d GSE20 ALE20 THEFT DETERRENT

This circuit provides power for main body ECU RH operation.

Even when the theft deterrent system is in the disarmed state, the security indicator blinks due to a signal output from the immobiliser system. The security indicator blinks continuously due to a continuous signal received from the immobiliser system while in the armed state.

The main body ECU RH causes the security indicator to light up or blink only during the arming preparation state and alarm sounding state.

When the engine switch is turned on (IG), positive (+) battery voltage is applied to the main body ECU RH (cowl side J/B RH). When battery positive (+) voltage is applied to terminal IG of the main body ECU (cowl side J/B RH) while the theft deterrent system is operating, the warning stops.