2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH - BODY GROUND) 
    1. Disconnect the connector of the pattern select switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Specified Condition
      4 - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying Pattern Select Switch Connector Terminal
    G05261294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  2. INSPECT PATTERN SELECT SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below

      Standard resistance 

      RESISTANCE REFERENCE

      Switch Condition Tester Connection Specified Condition
      Pattern select switch continuously pressed (2nd STRT) 3 - 4 Below 1 Ω
      Pattern select switch released (2nd STRT) ↑ 10 kΩ or higher
      Fig 2: Identifying Pattern Select Switch Connector Terminal
      G05261295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH - ECM) 
    1. Connect the connector of the pattern select switch.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Switch Condition Tester Connection Specified Condition
      Pattern select switch continuously pressed (2nd STRT) E8-27 (SNWI) - Body ground Below 1 Ω
      Pattern select switch released (2nd STRT) ↑ 10 kΩ or higher
      Fig 3: Identifying Pattern Select Switch Connector Terminal And ECM Connector Terminal
      G05844413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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