Code Definition

B1010 — Multiplex integrated control unit communication with door multiplex control module lost

System: Body  |  Type: Manufacturer-Specific  |  Make: Honda

About B1010

B1010 is a manufacturer-specific body diagnostic trouble code recorded for Honda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1010 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Honda Multiplex Integrated Control Unit (MICU), located behind the dashboard on the driver's side, serves as the central communication hub for the vehicle's body electrical multiplex network. DTC B1010 is set when the MICU detects a loss of communication with one or more Door Multiplex Control Modules (DMCM), which manage door-related electrical functions including power windows, door locks, mirror controls, and courtesy lights. The MICU continuously polls the DMCMs over dedicated multiplex communication wiring, and if expected response data is not received within the specified timeout per...

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