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.
Diagnostic Trouble Code Chart
Door ECU (driver side)
| DTC No. | Detection Item | Diagnosis |
|---|---|---|
| B1231/31 | Jam Protection Limit Switch Circuit on Driver Door | Jam protection limit switch on driver door |
| B1232/32 | Jam Protection Pulse Switch Circuit on Driver Door | Jam protection pulse switch on driver door |
Monitor Code
The monitor code shows the switch condition when a DTC is output.
When a monitor code is indicated while the switch is not operated, the switch is detected in being stuck. When monitor code is not indicated while switch is operated, it is detected that the switch contact condition is bad.
| DTC No. | Detection Item | Diagnosis |
|---|---|---|
| B1221/21 | Power Window Switch Circuit on Driver Door | Power window switch circuit on driver door |
NO RELATED
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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.