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 Scion tC Automatic TransFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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 this system before inspecting the suspected areas below.
POWER WINDOW CONTROL SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Power Window Switches on Each Door Operate, but Remote Operation from Power Window Master Switch is not Possible | Power window regulator master switch assembly | Refer to ON-VEHICLE INSPECTION |
| Harness or connector | - | |
| Driver Side Power Window does not Operate with Power Window Master Switch | Power window regulator master switch assembly | Refer to ON-VEHICLE INSPECTION |
| Power window regulator motor assembly LH | Refer to INSPECTION | |
| Harness or connector | - | |
| Passenger Side Power Window does not Operate with Passenger Side Power Window Switch | Power window regulator switch assembly | Refer to INSPECTION |
| Power window regulator motor assembly RH | Refer to INSPECTION | |
| Harness or connector | - | |
| Power Windows do not Operate at All | Power window regulator master switch assembly | Refer to ON-VEHICLE INSPECTION |
| Harness or connector | - | |
| Key-off Operation Function Operates even if Operating Conditions are not Satisfied | Front door courtesy light switch assembly LH | Refer to INSPECTION |
| Front door courtesy light switch assembly RH | Refer to INSPECTION | |
| Main body ECU (multiplex network body ECU) | Refer to REMOVAL | |
| Harness or connector | - |
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.