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.
2012 Lexus IS FFACTORY OEM SERVICE PROCEDURE
Power Window Control System (Diagnostics & Symptom Tests)
- Power Window Control System
- Precaution
- Parts Location
- System Diagram
- System Description
- How To Proceed With Troubleshooting
- Operation Check
- Customize Parameters
- Initialization
- Problem Symptoms Table
- Terminals Of Ecu
- Diagnosis System
- Fail-Safe Chart
- Data List / Active Test
- Symptom Tests
- Remote Up / Down Function does not Operate
- Driver Side Power Window does not Operate with Power Window Master Switch
- 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 LH
- Rear Power Window RH does not Operate with Rear Power Window Switch RH
- 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 with Front Passenger Side Power Window Switch
- 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 with Rear Power Window Switch RH
- 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
- Auto Up Operation does not Fully Close Power Window (Jam Protection Function is Activated)
- Jam Protection Function does not Operate
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.