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 350 AWDFACTORY 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
Use the Manual With the Right Hardware
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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.