2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK WIRE HARNESS (PATTERN SELECT SWITCH - BODY GROUND) 
    1. Disconnect the E11 pattern select switch connector.
      Fig 1: Identifying E11 Pattern Select Switch Connector Terminals
      G05289632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      E11-3 (E) - Body ground Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to Next Step 

  2. INSPECT PATTERN SELECT SWITCH 
    1. Measure the resistance of the switch.
      Fig 2: Identifying E3 And P7 Connector Terminals
      G05289633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      3 (E) - 7 (P) Pattern select switch (PWR) Below 1 Ω
      3 (E) - 7 (P) Pattern select switch (NORM) 10 kΩ or higher

    NG: REPLACE PATTERN SELECT SWITCH 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - PATTERN SELECT SWITCH) 
    Fig 3: Identifying P4 Passenger Side Junction Block Connector Terminals
    G05289634Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P4 ECU connector.
    2. Measure the resistance of the passenger side junction block ECU.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      P4-18 (PWR) - Body ground Pattern select switch (PWR) Below 1 Ω
      P4-18 (PWR) - Body ground Pattern select switch (NORM) 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND 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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