Height Control Sensor (Rear)
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Connect 3 dry batteries of 1.5 volts in series. See Fig 1. Connect terminal No. 3 to the batteries' positive (+) terminal and terminal No. 1 to the batteries' negative (-) terminal, then apply voltage about 4.5 volts between terminals No. 1 and No. 3. Measure the voltage between terminals No. 1 and No. 2, when the height control sensor link is slowly moved up and down. See INSPECTING HEIGHT CONTROL SENSOR VOLTAGE table. If the voltage is not as specified, replace the height control sensor.