2009 Lexus LS 460 AWDFACTORY 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.
  • Inspect the fuses and relays related to the system before inspecting the suspected areas below.

Power window control system: 

PROBLEM SYMPTOMS CHART

Symptom Suspected Area See
Remote UP/DOWN function does not operate LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
CAN communication system CAN COMMUNICATION SYSTEM
Multiplex network master switch assembly REMOTE UP/DOWN FUNCTION DOES NOT OPERATE 
Driver side power window does not operate with power window master switch D DOOR 1 fuse -
D DOOR 2 fuse -
D-IG1-3 fuse -
D MPX-B 1 fuse -
D-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Multiplex network master switch assembly DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Front power window regulator motor assembly LH 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 power window regulator switch P DOOR 1 fuse -
P DOOR 2 fuse -
P-IG1-1 fuse -
P MPX-B fuse -
P-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Front power window regulator switch assembly RH FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Front power window regulator motor assembly RH FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Harness or connector FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Rear power window LH does not operate with power window regulator switch D RR DOOR fuse -
RR-IG1-2 fuse -
RR MPX-B 2 fuse -
RR-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Rear power window regulator switch assembly LH REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Rear power window regulator motor assembly LH REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Harness or connector REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Rear power window RH does not operate with power window regulator switch P RR DOOR fuse -
RR-IG1-1 fuse -
P MPX-B fuse -
RR-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Rear power window regulator switch assembly RH REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Rear power window regulator motor assembly RH REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Harness or connector REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Driver side power window AUTO UP/DOWN function does not operate D DOOR 1 fuse -
D DOOR 2 fuse -
D-IG1-3 fuse -
D MPX-B 1 fuse -
D-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Multiplex network master switch assembly DRIVER SIDE POWER WINDOW AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Front power window regulator motor assembly LH DRIVER SIDE POWER WINDOW AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH 
Harness or connector 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 P DOOR 1 fuse -
P DOOR 2 fuse -
P-IG1-1 fuse -
P MPX-B fuse -
P-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Front power window regulator switch assembly RH FRONT PASSENGER SIDE POWER WINDOW AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Front power window regulator motor assembly RH FRONT PASSENGER SIDE POWER WINDOW AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH 
Harness or connector 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 D RR DOOR fuse -
RR-IG1-2 fuse -
RR MPX-B 2 fuse -
RR-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Rear power window regulator switch assembly LH REAR POWER WINDOW LH AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Rear power window regulator motor assembly LH REAR POWER WINDOW LH AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH 
Harness or connector 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 P RR DOOR fuse -
RR-IG1-1 fuse -
P MPX-B fuse -
RR-IG1 relay -
LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Rear power window regulator switch assembly RH REAR POWER WINDOW RH AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Rear power window regulator motor assembly RH REAR POWER WINDOW RH AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
Harness or connector REAR POWER WINDOW RH AUTO UP/DOWN FUNCTION DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH 
All power windows do not operate with driver side door key cylinder or wireless transmitter Wireless door lock control system HOW TO PROCEED WITH TROUBLESHOOTING
Power door lock control system HOW TO PROCEED WITH TROUBLESHOOTING
Main body ECU (driver side junction block) 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 LIN communication system HOW TO PROCEED WITH TROUBLESHOOTING
Front door courtesy light switch HOW TO PROCEED WITH TROUBLESHOOTING
Main body ECU (driver side junction block) KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED 
AUTO UP operation does not fully close power window Gam protection is activated) Glass position initialization AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Improper installation (door glass run) AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Power window regulator motor assembly (applicable location) AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Jam protection function does not operate Glass position initialization JAM PROTECTION FUNCTION DOES NOT OPERATE 
Power window regulator motor assembly (applicable location) JAM PROTECTION FUNCTION DOES NOT OPERATE 
Harness or connector JAM PROTECTION FUNCTION DOES NOT OPERATE 
All power window UP functions do not operate with entry lock switch Entry lock and unlock switch ALL POWER WINDOW UP FUNCTIONS DO NOT OPERATE WITH ENTRY LOCK SWITCH 
Main body ECU (driver side junction block) ALL POWER WINDOW UP FUNCTIONS DO NOT OPERATE WITH ENTRY LOCK SWITCH 
AUTO DOWN operation does not fully open power window Glass position initialization AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) 
Factory Service Tools

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