2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

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

      Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      3 - Body ground Below 1 Ω
    Fig 1: Identifying Pattern Select Switch Connector Terminals
    G05288169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

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

      Resistance 

      RESISTANCE SPECIFICATION

      Switch Condition Tester Connection Specified Condition
      Pattern select switch (PWR) 3 - 7 Below 1 Ω
      Pattern select switch (NORM) ↑ 10 kΩ or higher
    Fig 2: Identifying Pattern Select Switch Connector Terminals
    G05288170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE PATTERN SELECT SWITCH ASSEMBLY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - MULTIPLEX NETWORK BODY ECU) 
    1. Connect the connector of pattern select switch.
    2. Disconnect the cowl side junction block (multiplex network body ECU) connector.
    3. Measure the resistance between terminal PWR of the cowl side junction block (multiplex network body ECU) and body ground.

      Resistance 

      RESISTANCE SPECIFICATION

      Switch Condition Tester Connection Specified Condition
      Pattern select switch (PWR) K68 - 18 (PWR) - Body ground Below 1 Ω
      Pattern select switch (NORM) ↑ 10 kΩ or higher
    Fig 3: Disconnecting Cowl Side Junction Block (Multiplex Network Body ECU) Connector
    G05288175Courtesy 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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