Code Definition

B1002 — Multiplex integrated control unit internal error

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

About B1002

B1002 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.

B1002 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

On Honda vehicles the Multiplex Integrated Control Unit (MICU) is the central body-electrical module — it controls and multiplexes interior and exterior lighting, door locks, power windows, wiper logic, key/immobiliser interface and the F-CAN/B-CAN body network. DTC B1002 sets when the MICU's internal self-test detects a hardware, EEPROM or processor fault distinct from B1001 — typically pointing to a different failed internal section but still indicating that the unit can no longer be trusted to operate body electrics correctly. Common triggers include corrupt EEPROM/flash data after a lo...

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