Inspection Procedure

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

INSPECT LUMBAR SUPPORT SWITCH
1. Remove the lumbar support switch.
2. Measure the resistance.
  Standard:
  
  Upper side control
  
  Fig 1: Terminals Resistance Reference Chart (Upper Side Control)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Lower side control
  
  Fig 2: Terminals Resistance Reference Chart (Lower Side Control)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Inspecting Lumbar Support Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE LUMBER SUPPORT SWITCH

OK: Go to next step.
INSPECT POWER SEAT MOTOR (See INSPECTION )
NG: REPLACE POWER SEAT MOTOR

OK: Go to next step.
CHECK WIRE HARNESS (POWER SEAT CONTROL SWITCH - POWER SEAT MOTOR AND BODY GROUND)
1. Disconnect the P23 switch, P30 and P31 motor connectors.
2. Measure the resistance and voltage of the wire harness side connectors.
  Standard:
  
  Fig 4: Terminals Resistance And Voltage Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Checking Wire Harness (Power Seat Control Switch - Power Seat Motor And Body Ground)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR AND REPLACE HARNESS AND CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )