B1006 The multiplex integrated control unit lost communication with the door multiplex control unit

What does B1006 mean on a Honda?

B1006. The multiplex integrated control unit lost communication with the door multiplex control unit. Power lock and window features may stop working. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1006

• Faulty door multiplex control unit
• Open or short in the door multiplex control unit harness
• Poor connection in the door multiplex control unit circuit
• Faulty multiplex integrated control unit (MICU)
• Corroded or loose pins on the data link

How to fix B1006

1. Confirm the code with a scan tool and check every module for related faults
2. Inspect the data link connectors at both ends for corrosion and loose pins
3. Test the data link wiring for opens and shorts with a multimeter
4. Repair damaged wiring or connectors before replacing a module
5. Replace the door multiplex control unit that fails testing
6. Clear the code and retest

Sources and review

• Last updated 2026-10-10.