2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

PROBLEM SYMPTOMS CHART

Symptom Suspected Area See
Remote UP / DOWN function does not operate Multiplex network master switch assembly REMOTE UP / DOWN FUNCTION DOES NOT OPERATE 
Wire harness REMOTE UP / DOWN FUNCTION DOES NOT OPERATE 
AUTO UP operation does not fully close power window (jam protection is activated) Power window regulator motor assembly AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Power window regulator assembly AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Door glass run AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Door glass AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Driver side power window does not operate with power window master switch Multiplex network master switch assembly DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Power window regulator motor assembly LH front (driver side) DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Multiplex network door ECU front LH (Driver door ECU) DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Wire harness DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Front passenger side power window does not operate with front power window switch Multiplex network switch assembly (passenger side) FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Power window regulator motor assembly RH front (passenger side) FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Multiplex network door ECU front RH (Passenger door ECU) FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Wire harness FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Rear power window LH does not operate with rear power window switch Multiplex network switch assembly (rear LH) REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Power window regulator motor assembly LH rear REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Multiplex network door ECU rear LH (Rear door LH ECU) REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Wire harness REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Rear power window RH does not operate with rear power window switch Multiplex network switch assembly (rear RH) REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Power window regulator motor assembly RH rear REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Multiplex network door ECU rear RH (Rear door RH ECU) REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Wire harness REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Driver side power window AUTO UP / DOWN Function does not operate Multiplex network master switch assembly DRIVER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Power window regulator motor assembly LH front (driver side) DRIVER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Wire harness DRIVER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Front passenger side power window AUTO UP / DOWN function does not operate Multiplex network switch assembly (front passenger side) FRONT PASSENGER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Power window regulator motor assembly RH front (front passenger side) FRONT PASSENGER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Wire harness FRONT PASSENGER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Rear power window LH AUTO UP / DOWN function does not operate Multiplex network switch assembly (rear LH) REAR POWER WINDOW LH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Power window regulator motor assembly LH rear REAR POWER WINDOW LH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Wire harness REAR POWER WINDOW LH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Rear power window RH AUTO UP / DOWN function does not operate Multiplex network switch assembly (rear RH) REAR POWER WINDOW RH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Power window regulator motor assembly RH rear REAR POWER WINDOW RH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Wire harness REAR POWER WINDOW RH AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Jam protection function does not operate Multiplex network (master) switch assembly JAM PROTECTION FUNCTION DOES NOT OPERATE 
Power window regulator motor assembly JAM PROTECTION FUNCTION DOES NOT OPERATE 
Wire harness JAM PROTECTION FUNCTION DOES NOT OPERATE 
All power windows do not operate with driver side door key cylinder or wireless transmitter Multiplex network master switch assembly ALL POWER WINDOWS DO NOT OPERATE WITH DRIVER SIDE DOOR KEY CYLINDER OR WIRELESS TRANSMITTER 
Wireless door lock control system ALL POWER WINDOWS DO NOT OPERATE WITH DRIVER SIDE DOOR KEY CYLINDER OR WIRELESS TRANSMITTER 
Power door lock control system ALL POWER WINDOWS DO NOT OPERATE WITH DRIVER SIDE DOOR KEY CYLINDER OR WIRELESS TRANSMITTER 
Key-off operation function operates even if operating conditions are not satisfied Multiplex network master switch assembly KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED 
Front door courtesy light switch assembly LH (driver side) KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED 
Wire harness KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED 
Multiplex network body ECU (cowl side junction block RH ECU) KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED 
Factory Service Tools

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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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