2004 Lexus LX 470FACTORY OEM SERVICE PROCEDURE

Multiplex Communication System

MULTIPLEX COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Description
B1211 Driver door ECU communication stop
B1213 Tilt and Telescopic ECU communication stop
B1214, B1215 Door system communication bus malfunction (+B short)/(GND short)
B1218 Body ECU No. 2 communication stop
B1245 Auto wiper ECU communication stop
B1269 Theft deterrent ECU communication stop
B1272 Power seat ECU communication stop
B1273 Sliding roof control ECU communication stop (w/ Sliding roof vehicle only)
B1275 Accessory Bus Buffer communication stop
B1276 Mirror ECU communication stop
B1279 Rain sensor communication stop
B1281 Airbag ECU communication stop
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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