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.
2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Power Window System (Diagnostics)
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Component Location
- Control Module I/O Signal
- Inspection Mode
- Diagnostic Procedure for Subaru Select Monitor Communication
- Data Monitor
- Freeze Frame Data
- Active Test
- Work Support
- Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC B2B00: Driver's Door Power Window Auto Switch Stuck
- DTC B2B01: Driver's Door Power Window Manual Up Switch Stuck
- DTC B2B02: Driver's Door Power Window Manual Down Switch Stuck
- DTC B2B03: Driver's Door Power Window Pulse1 And 2 No Signal
- DTC B2B04: Driver's Door Power Window Pulse 1 No Signal
- DTC B2B05: Driver's Door Power Window Pulse 2 No Signal
- DTC B2B06: Driver's Door Power Window Pulse Direction
- DTC B2B07: Driver's Door Power Window Position
- DTC B2B08: Driver's Door Power Window Continuous Reversal
- DTC B2B09: Driver's Door Power Window Control Module EEPROM
- DTC B2B10: Passenger's Door Power Window Driver's Door Auto Switch Stuck
- DTC B2B11: Passenger's Door Power Window Driver's Door Manual Up Switch Stuck
- DTC B2B12: Passenger's Door Power Window Driver's Door Manual Down Switch Stuck
- DTC B2B14: RR Door Power Window Driver's Door Manual Up Switch Stuck
- DTC B2B15: RR Door Power Window Driver's Door Manual Down Switch Stuck
- DTC B2B17: RL Door Power Window Driver's Door Manual Up Switch Stuck
- DTC B2B18: RL Door Power Window Driver's Door Manual Down Switch Stuck
- DTC B2B20: Passenger's Door Power Window Auto Switch Stuck
- DTC B2B21: Passenger's Door Power Window Manual Up Switch Stuck
- DTC B2B22: Passenger's Door Power Window Manual Down Switch Stuck
- DTC B2B23: Passenger's Door Power Window Pulse 1 And 2 No Signal
- DTC B2B24: Passenger's Door Power Window Pulse 1 No Signal
- DTC B2B25: Passenger's Door Power Window Pulse 2 No Signal
- DTC B2B26: Passenger's Door Power Window Pulse Direction
- DTC B2B27: Passenger's Door Power Window Position
- DTC B2B28: Passenger's Door Power Window Continuous Reversal
- DTC B2B29: Passenger's Door Power Window Control Module EEPROM
- DTC B2B31: RR Door Power Window Manual Up Switch Stuck
- DTC B2B32: RR Door Power Window Manual Down Switch Stuck
- DTC B2B33: RR Door Power Window Pulse 1 And 2 No Signal
- DTC B2B34: RR Door Power Window Pulse 1 No Signal
- DTC B2B35: RR Door Power Window Pulse 2 No Signal
- DTC B2B36: RR Door Power Window Pulse Direction
- DTC B2B37: RR Door Power Window Position
- DTC B2B38: RR Door Power Window Continuous Reversal
- DTC B2B39: RR Door Power Window Control Module EEPROM
- DTC B2B41: RL Door Power Window Manual Up Switch Stuck
- DTC B2B42: RL Door Power Window Manual Down Switch Stuck
- DTC B2B43: RL Door Power Window Pulse 1 And 2 No Signal
- DTC B2B44: RL Door Power Window Pulse 1 No Signal
- DTC B2B45: RL Door Power Window Pulse 2 No Signal
- DTC B2B46: RL Door Power Window Pulse Direction
- DTC B2B47: RL Door Power Window Position
- DTC B2B48: RL Door Power Window Continuous Reversal
- DTC B2B49: RL Door Power Window Control Module EEPROM
- DTC B2B50: Power Window Main Switch Failure
- Diagnostics with Phenomenon
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.
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.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.