BYD Seal 6 1st generation airbag control unit repair

What is a BYD Seal 6 1st generation airbag control unit?

In the BYD Seal 6 1st generation, the airbag control unit is the central unit of the restraint system (SRS). It evaluates what the crash sensors report and, in an accident, triggers the appropriate airbags and seatbelt pretensioners within milliseconds. After an accident it stores crash data and locks itself.

This control unit is fitted in the BYD Seal 6 1st generation (since 2025). There it continuously monitors all components of the restraint system, that is sensors, squib circuits and wiring. If it detects an inconsistency, it shows this via the airbag warning light.

As long as this light stays on, it can no longer be assumed that the airbags will deploy reliably in an emergency. Having the control unit checked is then advisable.

Why is the BYD Seal 6 1st generation airbag control unit defective?

Most often it is crash data stored after an accident, even if no airbag has deployed; a standard diagnostic tool cannot remove it. Ageing components, cold solder joints, moisture and corrosion on the connectors, or voltage spikes may also be the cause.

A defect first becomes noticeable at the warning light in the instrument cluster: it stays on permanently. If you then try to clear the fault memory and the entry returns immediately, this points to stored crash data. If the control unit does not respond to the diagnostic tool at all, that is a typical sign of a defect.

Even without an accident, the electronics deteriorate over the years. Solder joints can develop fine cracks, and moisture attacks the contacts. Voltage spikes occur, for example, with a weakened battery or when jump-starting.

Common error codes for BYD Seal 6 1st generation airbag control unit repair

The codes in the BYD Seal 6 1st generation point to faults in data communication, internal faults of the control unit, an unsuitable supply voltage, an airbag that is not connected, or stored crash data. Which of them appears in your case depends on the fault pattern and the equipment.

These codes are known for the vehicle, each shown here with its approximate meaning:

• B16AE00 → Fault in the SRS control unit
• B17A000 → Internal fault in the airbag control unit
• B17A200 → Crash recording locked, crash data stored
• B17A600 → Frontal impact detected by the control unit
• B17A800 → CAN bus communication interrupted
• B1694 → Supply voltage too low
• B1695 → Supply voltage too high
• B1600 → Driver front airbag not connected

Fault codes are read out with a diagnostic tool. A code alone cannot tell you with certainty whether the control unit is defective, because connectors, wiring or an airbag module can equally trigger the fault. Only the inspection shows where the cause lies.

What part numbers are available for the BYD Seal 6 1st generation airbag control unit repair?

You will find the part number on the label of the control unit; it defines its exact version. Depending on equipment and year of manufacture, the numbers differ within a model series, so you should look at the label before removal.

There is no reliable list of the numbers for this vehicle. Simply copy the number from the label into the repair order, so that we can check and repair the right version.

The number merely confirms that it is the matching unit. Whether it has a defect only becomes clear by reading out the fault memory or through the inspection.

The route to repair: have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send the unit to us. Checking, repairing and testing at Airbag24 usually take 3–4 working days, after which your own unit is returned to you. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.