Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Lexus GS 460FACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
Power Window Control System
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Driver side power window does not operate with power window master switch | Multiplex communication system | DRIVER SIDE POWER WINDOW DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH |
| MPX-B fuse | - | |
| Wire harness or connector | - | |
| Front power window regulator motor assembly (for driver side) | - | |
| Power window master switch (for driver side) | - | |
| Front passenger side power window does not operate with front passenger side power window switch | Multiplex communication system | FRONT PASSENGER SIDE POWER WINDOW DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH |
| Front power window regulator motor assembly (for front passenger side) | - | |
| Power window switch (for front passenger side) | - | |
| Wire harness or connector | - | |
| Rear power window LH does not operate with rear power window switch LH | Multiplex communication system | REAR POWER WINDOW LH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH LH |
| Rear power window regulator motor assembly LH | - | |
| Power window switch (for rear LH side) | - | |
| Wire harness or connector | - | |
| Rear power window RH does not operate with rear power window switch RH | Multiplex communication system | REAR POWER WINDOW RH DOES NOT OPERATE WITH REAR POWER WINDOW SWITCH RH |
| Rear power window regulator motor assembly RH | - | |
| Power window switch (for rear RH side) | - | |
| Wire harness or connector | - | |
| Driver side power window Auto Up / Down function does not operate with power window master switch | Front power window regulator motor assembly (for driver side) | DRIVER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH POWER WINDOW MASTER SWITCH |
| Power window master switch (for driver side) | - | |
| Wire harness or connector | - | |
| 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 (for front passenger side | FRONT PASSENGER SIDE POWER WINDOW AUTO UP / DOWN FUNCTION DOES NOT OPERATE WITH FRONT PASSENGER SIDE POWER WINDOW SWITCH |
| Power window switch (for front passenger side) | - | |
| Wire harness or connector | - | |
| 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 |
| Power window switch (for rear LH side) | - | |
| Wire harness or connector | - | |
| 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 |
| Power window switch (for rear RH side) | - | |
| Wire harness or connector | - | |
| Remote Up / Down function does not operate | Power window regulator motor assembly (applicable location) | REMOTE UP / DOWN FUNCTION DOES NOT OPERATE |
| Power window master switch (for driver side) | - | |
| Wire harness or connector | - | |
| Key-off operation function operates even if operating conditions are not satisfied | Front door courtesy light switch assembly (for driver side) | KEY-OFF OPERATION FUNCTION OPERATES EVEN IF OPERATING CONDITIONS ARE NOT SATISFIED |
| Body ECU (cowl side junction block RH) | - | |
| Auto Up operation does not fully close power window (Jam protection function is activated) | Glass position initialization (applicable location) | AUTO UP OPERATION DOES NOT FULLY CLOSE POWER WINDOW (JAM PROTECTION FUNCTION IS ACTIVATED) |
| Check and clean glass run (applicable location) | - | |
| Power window regulator motor assembly (applicable location) | - | |
| 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 | - | |
| Body ECU (cowl side junction block RH) | - | |
| Jam protection function does not operate | Glass position initialization (applicable location) | JAM PROTECTION FUNCTION DOES NOT OPERATE |
| Power window regulator motor assembly (applicable location) | - |
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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