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.
2021 Honda Insight EXFACTORY OEM SERVICE PROCEDURE
Power Window Master Switch DTCS
| DTC | Description | DTC type |
|---|---|---|
| B1125 | Driver's power window motor A pulse malfunction | Signal error |
| B1126 | Driver's power window motor B pulse malfunction | Signal error |
| B1127 | Driver's door lock key cylinder switch malfunction | Signal error |
| DTC | Description | DTC type |
|---|---|---|
| B1128 | Driver's door lock switch malfunction | Signal error |
| B1129 | Driver's door lock knob switch malfunction | Signal error |
| B1130 | Front passenger's power window motor A-phase pulse signal input error | Signal error |
| B1131 | Front passenger's power window motor B-phase pulse signal input error | Signal error |
| B1140 | Driver's power window position detect circuit malfunction | Signal error |
| B1142 | Power Window Master Switch lost communication with the other units (UART communication error) | Loss of communication |
| B1145 | Front passenger's window position detect circuit malfunction | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Power Window Master Switch lost communication with MICU (body control module) | Loss of communication |
| U128D | Power Window Master Switch lost communication with gauge control module | Loss of communication |
Factory Service Tools
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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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