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.
Power Window Control System: Fail-Safe
- CHECK POWER WINDOW FAIL-SAFE FUNCTION
HINT:
If there is a malfunction in the power window system, some of the power window functions will be disabled.
Driver side power window
FAIL-SAFE TABLE - DRIVER SIDE POWER WINDOWMalfunctioning Part Disabled Function Operative Function Pulse sensor circuit in power window motor - AUTO UP/DOWN function
- Power window operation function after ignition OFF
- Manual UP (fully pulled UP position)
- Manual DOWN
- Remote (AUTO and manual)
- Remote function after ignition OFF (AUTO and manual)
- MANUAL UP/DOWN function via driver side door lock key cylinder
- MANUAL DOWN function via transmitter
CPU in power window master switch - AUTO UP/DOWN function
- Remote function (AUTO and manual)
- MANUAL UP/DOWN function via driver side door lock key cylinder
- MANUAL DOWN function via transmitter
- Manual UP (fully pulled UP position)
- Manual DOWN
Power windows except driver side power window
FAIL-SAFE TABLE - POWER WINDOWS EXCEPT DRIVER SIDE POWER WINDOWMalfunctioning Part Disabled Function Operative Function - Pulse sensor circuit in power window motor
- CPU In power window master switch
- Communication between master switch and each power window switch
- AUTO UP/DOWN function
- Power window operation function after ignition OFF
- MANUAL UP/DOWN function via driver side door lock key cylinder
- MANUAL DOWN function via transmitter
- Manual UP function (fully pulled UP position)
- Manual DOWN function
- CHECK SWITCH CONDITION WITH INTELLIGENT TESTER
HINT:
DTC B1221 is output when switches of the power window master switch are on. When these switches are off, DTC B1221 is not output. Using this DTC, you can check whether these switches are normal or not.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.