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.
2001 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Multiplex Control System DTCS
MULTIPLEX CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1211 | Driver's Door ECU Communication Stopped |
| B1221 | Power Window Switch Circuit On Driver's Door |
| B1222 | Door Lock Switch Circuit On Driver's Door |
| B1241 | Body ECU Switch Circuit Diagnosis |
| B1242 | Wireless Door Control Receiver Circuit Malfunction |
| B1248 | AVC-LAN Circuit Communication Stopped |
| B1261 | ECM Communication Stopped |
| B1262 | A/C Amplifier Communication Stopped |
| B1266 | Instrument Panel System Communication Bus Malfunction (B+ Shorted) |
| B1267 | Instrument Panel System Communication Bus Malfunction (GND Shorted) |
| B1271 | Combination Meter ECU Communication Stopped |
| B1274 | Multi-Display Communication Stopped |
| B1293 | Gateway ECU Communication Stopped |
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.