2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK MANUAL UP/DOWN FUNCTION 
    1. Check that the manual UP/DOWN function of each switch operates normally.

      OK: 

      Manual UP/DOWN function operates normally. 

    NG: OTHER PROBLEM 

    OK: Go to next step 

  2. CHECK AUTO UP/DOWN FUNCTION 
    1. Check that the AUTO UP/DOWN function of each switch operates normally.

      OK: 

      AUTO UP/DOWN function operates normally. 

    NG: OTHER PROBLEM 

    OK: Go to next step 

  3. READ VALUE USING INTELLIGENT TESTER 
    1. Check the DATA LIST for proper functioning of the power window switch on the master switch.

      Multiplex network master switch assembly 

      DIAGNOSIS NOTE CHART

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      P P/W AUTO SW Front passenger side power window switch auto UP/DOWN signal/
      ON or OFF      		 ON: Front passenger side power window AUTO switch operates
      OFF: Front passenger side power window auto switch does not operate      		 -
      P P/W UP SW Front passenger side power window switch UP signal/
      ON or OFF      		 ON: Front passenger side power window manual UP switch operates
      OFF: Front passenger side power window manual UP switch does not operate      		 -
      P P/W DOWN SW Front passenger side power window switch DOWN signal/
      ON or OFF      		 ON: Front passenger side power window manual DOWN switch operates
      OFF: Front passenger side power window manual DOWN switch does not operate      		 -
      RL P/W AUTO SW Rear power window LH switch auto UP/DOWN signal/
      ON or OFF      		 ON: Rear power window LH AUTO switch operates
      OFF: Rear power window LH AUTO switch does not operate      		 -
      RL P/W UP SW Rear power window LH switch UP signal/
      ON or OFF      		 ON: Rear power window LH manual UP switch operates
      OFF: Rear power window LH manual UP switch does not operate      		 -
      RL P/W DOWN SW Rear power window LH switch DOWN signal/
      ON or OFF      		 ON: Rear power window LH manual DOWN switch operates
      OFF: Rear power window LH manual DOWN switch does not operate      		 -
      RR P/W AUTO SW Rear power window RH switch auto UP/DOWN signal/
      ON or OFF      		 ON: Rear power window RH AUTO switch operates
      OFF: Rear power window RH AUTO switch does not operate      		 -
      RR P/W UP SW Rear power window RH switch UP signal/
      ON or OFF      		 ON: Rear power window RH manual UP switch operates
      OFF: Rear power window RH manual UP switch does not operate      		 -
      RR P/W DOWN SW Rear power window RH switch DOWN signal/
      ON or OFF      		 ON: Rear power window RH manual DOWN switch operates
      OFF: Rear power window RH manual DOWN switch does not operate      		  

      OK: 

      ON (power window regulator switch on master switch operates) appears on screen. 

    NG:  Go to step  4

    OK: REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 

  4. CHECK WIRE HARNESS (MULTIPLEX NETWORK DOOR ECU - MULTIPLEX NETWORK SWITCH ASSEMBLY) 
    1. Disconnect the M4, O7 and O3 ECU connectors.
    2. Disconnect the Q6, S5 and S1 switch connectors.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance: 

      Front passenger side 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      M4-7 (MPX3) - Q6-4 (MPX1) Below 1 Ω
      M4-7 (MPX3) or Q6-4 (MPX1) - Body ground 10 kΩ or higher

      Rear LH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      O7-7 (MPX3) - S5-4 (MPX1) Below 1 Ω
      O7-20 (PWSL) - S5-11 (SEL2) Below 1 Ω
      O7-7 (MPX3) or S5-4 (MPX1) - Body ground 10 kΩ or higher
      O7-20 (PWSL) or S5-11 (SEL2) - Body ground 10 kΩ or higher

      Rear RH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      O3-7 (MPX3) -S1-4 (MPX1) Below 1 Ω
      O3-20 (PWSL) - S1-10 (SEL1) Below 1 Ω
      O3-7 (MPX3) or S1-4 (MPX1) - Body ground 10 kΩ or higher
      O3-20 (PWSL) or S1-10 (SEL1) - Body ground 10 kΩ or higher
    Fig 1: Checking Wire Harness (Multiplex Network Door ECU - Multiplex Network Switch Assembly)
    G05300161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  5. READ VALUE USING INTELLIGENT TESTER (WINDOW LOCK SIGNAL) 
    1. Check the DATA LIST for proper functioning of the power window switch on the master switch.

      Multiplex network master switch assembly 

      DIAGNOSIS NOTE CHART

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      P/W LOCK SW Power window LOCK switch signal ON/OFF ON: Power window LOCK switch ON
      OFF: Power window LOCK switch OFF      		 -

    NG:  Go to step  6

    OK: REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 

  6. CHECK WIRE HARNESS (MASTER SWITCH - SWITCH)) 
    1. Disconnect the Q13 switch connector.
    2. Disconnect the Q6, S5 and S1 switch connectors.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance: 

      Front Passenger Side 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      Q13-6 (PWS) - Q6-9 (PCT) Below 1 Ω
      Q13-6 (PWS) or Q6-9 (PCT) - Body ground 10 kΩ or higher

      Rear LH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      Q13-6 (PWS) - S5-9 (PCT) Below 1 Ω
      Q13-6 (PWS) or S5-9 (PCT) - Body ground 10 kΩ or higher

      Rear RH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      Q13-6 (PWS) - S1-9 (PCT) Below 1 Ω
      Q13-6 (PWS) or S1-9 (PCT) - Body ground 10 kΩ or higher
    Fig 2: Checking Wire Harness (Master Switch - Switch))
    G05300162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 

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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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