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.
2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
POWER WINDOW CONTROL SYSTEM
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | Reference |
|---|---|---|
| Power window does not operate with multiplex network master switch operation | ECU-B, ECU-IG, PWR fuse | - |
| Multiplex network master switch circuit (power source) | Power Window Master Switch Power Source Circuit | |
| Power window regulator motor circuit | Driver Side Power Window Motor Circuit | |
| Multiplex network master switch | - | |
| Front passenger side power window does not operate with multiplex network switch operation | PWR fuse | - |
| Multiplex network switch circuit (power source) | Front Passenger Side Power Window Switch Power Source Circuit | |
| Power window regulator motor circuit (front passenger side) | Front Passenger Side Power Window Motor Circuit | |
| Multiplex network switch (front passenger side) | - | |
| Rear LH side power window does not operate with multiplex network switch operation | PWR fuse | - |
| Multiplex network switch circuit (power source) | Rear Power Window Switch LH Circuit | |
| Power window regulator motor circuit (rear LH side) | Rear Power Window Motor LH Circuit | |
| Multiplex network switch (rear LH side) | - | |
| Rear RH side power window does not operate with multiplex network switch operation | PWR fuse | - |
| Multiplex network switch circuit (power source) | Rear Power Window Switch RH Circuit | |
| Power window regulator motor circuit (rear RH side) | Rear Power Window Motor RH Circuit | |
| Multiplex network switch (rear RH side) | - | |
| AUTO UP/DOWN function does not operate on driver side | Diagnosis check | DIAGNOSIS SYSTEM |
| Power window regulator motor reset | INITIALIZATION | |
| Multiplex network master switch | - | |
| Wire harness | - | |
| AUTO UP/DOWN function does not operate on any door side except driver side | Diagnosis check | DIAGNOSIS SYSTEM |
| Power window regulator motor reset | INITIALIZATION | |
| Multiplex network master switch | - | |
| Wire harness | - | |
| Remote UP/DOWN function does not operate | DATA LIST/ACTIVE TEST | DATA LIST/ACTIVE TEST |
| Multiplex network master switch | - | |
| Multiplex network body ECU | - | |
| Wire harness | - | |
| Power window can be operated after engine switch is turned off even if operated conditions are not met | Front door courtesy switch | DOOR COURTESY SWITCH CIRCUIT |
| Wire harness | - | |
| AUTO UP operation does not fully close power window (Jam protection function is activated) | Power window regulator motor reset | CUSTOMIZE PARAMETERS |
| Check & clean glass run | - | |
| Multiplex network master switch | - |
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.
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