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 Avalon XLSFACTORY OEM SERVICE PROCEDURE
Multiplex Control Systems DTCS
MULTIPLEX CONTROL SYSTEMS DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B1211/11 | Driver Door ECU Communication Stopped |
| B1212/12 | Front Passenger Door ECU Communication Stopped |
| B1214/14 | System Communication Bus Malfunction (Short To Voltage) |
| B1215/15 | System Communication Bus Malfunction (Short To Ground) |
| B1221/21 | Driver Door Power Window Switch Circuit Malfunction |
| B1222/22 | Driver Door Power Door Lock Switch Circuit Malfunction |
| B1223/23 | Front Passenger Door Power Window Switch Circuit Malfunction |
| B1224/24 | Front Passenger Door Lock Switch Circuit Malfunction |
| B1231/31 | Driver Door Jam Protection Limit Switch Circuit Malfunction |
| B1232/32 | Driver Door Jam Protection Pulse Switch Circuit Malfunction |
| B1241/41 | Body Control ECU Switch Circuit Diagnosis |
| B1242/42 | Wireless Door Lock Control Receiver Malfunction |
| B1243/43 | GSW Terminal Circuit To Center Air Bag Sensor Assembly Malfunction |
| B1244/44 | Automatic Light Control Sensor Circuit Malfunction |
| B1251/51 | Power Mirror Switch Circuit Malfunction |
| B1269/69 | Theft Deterrent ECU Communication Stopped |
| B1272/72 | Power Seat ECU Communication Stopped |
Factory Service Tools
Use the Manual With the Right Hardware
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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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