B1007 The multiplex integrated control unit lost communication with the combination switch control unit
What does B1007 mean on a Honda?
B1007. The multiplex integrated control unit lost communication with the combination switch control unit. Lights and wiper controls may stop working. This Honda-enhanced code applies to Honda and Acura models that use this code.
Common causes of B1007
- Faulty combination switch control unit
- Open or short in the combination switch control unit harness
- Poor electrical connection in the combination switch circuit
- Faulty multiplex integrated control unit (MICU)
- Corroded or loose pins on the data link
How to fix B1007
- Confirm the code and check every module on the system for related faults
- Inspect the data link connectors at both ends for corrosion and loose pins
- Test the data link wiring for opens and shorts with a multimeter
- Repair damaged wiring or connectors before replacing a module
- Replace the combination switch control unit that fails testing
- Clear the code and retest
Sources and review
- Last updated 2026-10-10.