Code Definition

B1000 — Control unit N22 (ACC push button module) is defective

System: Body  |  Type: Manufacturer-Specific  |  Make: Mercedes-Benz

About B1000

B1000 is a manufacturer-specific body diagnostic trouble code recorded for Mercedes-Benz 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.

B1000 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 Mercedes-Benz vehicles, control unit N22 is the Automatic Climate Control (ACC) push button module — the driver-facing control panel in the centre dash that handles fan, temperature, airflow distribution, AC, and rear demist requests. The module reads user input, displays climate status, and communicates those requests to the HVAC blower and actuator control modules via the interior CAN bus. DTC B1000 is stored when an internal self-test within N22 fails or when the module reports itself as defective to the Central Gateway. The driver may notice an unresponsive climate panel, frozen displ...

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