2007 Lexus IS 350FACTORY 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.

      Standard resistance 

      HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND) STANDARD RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      3 - Body ground Below 1 Ω
      Fig 1: Identifying Pattern Select Switch Assembly
      G05316917Courtesy 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.

      Standard resistance 

      PATTERN SELECT SWITCH ASSEMBLY STANDARD RESISTANCE SPECIFICATIONS

      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 Assembly
      G05316918Courtesy 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 - MAIN BODY ECU) 
    1. Connect the connector of pattern select switch.
    2. Disconnect the cowl side junction block (main body ECU RH) connector.
    3. Measure the resistance between terminal PWR of the cowl side junction block (main body ECU RH) and body ground.

      Standard resistance 

      HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - MAIN BODY ECU) STANDARD RESISTANCE SPECIFICATIONS

      Switch Condition Tester Connection Specified Condition
      Pattern select switch (PWR) J75 - 18 (PWR) - Body ground Below 1 Ω
      Pattern select switch (NORM) ↑ 10 kΩ or higher
      Fig 3: Identifying Cowl Side Junction Block (Main Body ECU RH) Connector
      G05316919Courtesy 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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