Code Definition

B1029 — Alarm system siren communication with multiplex integrated control unit lost

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

About B1029

B1029 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.

B1029 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 equipped with a battery backed alarm siren, the Multiplex Integrated Control Unit (MICU) communicates with the intelligent siren over a dedicated data line to verify the siren is present, is healthy, and has its backup battery charged. DTC B1029 is set when the MICU sends its periodic polling messages to the siren and does not receive valid responses within the expected time window, indicating the siren is electrically or logically absent from the network. The siren contains its own internal microcontroller and backup battery so that it can continue to sound if the main vehic...

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