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.
2002 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Multiplex Control Systems DTCS
MULTIPLEX CONTROL SYSTEMS DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION
| DTC | Description |
| B1211/11 | Wire harness, Driver Door ECU |
| B1221/21 | Power Window Master Switch, Wire harness |
| B1222/22 | Door Lock Control Switch, Door Key Lock & Unlock Switch, Wire Harness |
| B1241/41 | Stop Light Switch, Wire Harness |
| B1242/42 | Wire Harness, Wireless Door Lock Tuner |
| B1248/48 | Wire Harness, Gateway ECU |
| B1261/61 | Wire Harness, ECM |
| B1262/62 | Wire Harness, A/C amplifier |
| B1266/66 | Wire Harness, ECU (Instrument Panel System) |
| B1267/67 | Wire Harness, ECU (Instrument Panel System) |
| B1271/71 | Wire Harness, Combination Meter ECU |
| B1274/74 | Wire Harness, Multi Display |
| B1293/93 | Wire Harness, Power Source Circuit, Gateway ECU |
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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