Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEIGHT CONTROL SENSOR SUB-ASSY FRONT LH
1. Connect 3 dry cell batteries (1.5 V) in series.
2. Connect the dry cell battery positive terminal to terminal SHB, and the negative one to terminal SHG to apply the voltage of 4.5 V between terminals SHB and SHG.
3. While slowly move the link up and down with the voltage being applied, check the voltage between terminals SHFL and SHG. See Fig 2.
  
  Fig 1: Link Angle Versus Volage Table - Height Control Sensor Sub-Assy Front, LH
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard:

Fig 2: Inspecting Link Angle Of Height Control Sensor Sub-Assy Front LH
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE HEIGHT CONTROL SENSOR SUB-ASSY FRONT LH
2. OK: Go to next step.
INSPECT HEIGHT CONTROL SENSOR SUB-ASSY REAR LH
1. Connect 3 dry cell batteries (1.5 V) in series.
2. Connect the dry cell battery positive terminal to terminal SHB, and the negative one to terminal SHG to apply the voltage of 4.5 V between terminals SHB and SHG.
3. While slowly move the link up and down with the voltage being applied, check the voltage between terminals SHRL and SHG. See Fig 4.
  
  Fig 3: Link Angle Versus Voltage Table - Height Control Sensor Sub-Assy Rear LH
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard:

Fig 4: Inspecting Link Angle Of Height Control Sensor Sub-Assy Rear LH
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE HEIGHT CONTROL SENSOR SUB-ASSY REAR LH
2. OK: Go to next step.
CHECK HARNESS AND CONNECTOR
1. Check for open and short circuit in harness and connector between headlamp leveling ECU and height control sensor.
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON (See PROBLEM SYMPTOMS TABLE )