MG HS 2nd generation airbag control unit repair

What is a MG HS 2nd generation airbag control unit?

As the central control unit of the restraint system (SRS) in the MG HS 2nd generation, the airbag control unit decides within milliseconds in a crash which airbags and seatbelt pretensioners deploy. To do so, it evaluates the signals from the crash sensors. After a crash it stores crash data and locks itself.

In an impact, the unit compares the sensor readings, assesses the severity of the crash and enables the firing of the appropriate restraint devices. The control unit is installed in the MG HS 2nd generation (since 2024).

As long as nothing happens, it nevertheless remains active: it continuously monitors the sensors, wiring and squib circuits of the entire system. If it detects a fault, the airbag warning light in the instrument cluster alerts you.

Why is the MG HS 2nd generation airbag control unit defective?

Most often the cause is crash data stored in the MG HS 2nd generation airbag control unit after a crash, even if no airbag deployed; an ordinary diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture with corrosion on connectors and voltage spikes.

A weak battery or jump-starting can trigger such voltage spikes. Moisture and corrosion mainly affect the connectors, while ageing and cold solder joints impair the electronics inside the unit.

A fault is indicated if the airbag warning light stays on permanently, the fault memory cannot be reset or the diagnostic tool cannot establish a connection. In this case, first have the fault memory read out before you decide how to proceed.

Common error codes for MG HS 2nd generation airbag control unit repair

The codes in the MG HS 2nd generation point to faults in communication, in the squib circuits of the front airbags, at the crash sensors or in the crash data memory. They can be read out with a diagnostic tool.

The following error codes are known for this vehicle, among others:

• B193E → Deployment record memory is full
• B1932 → Frontal deployment crash data stored
• U0151 → Communication with airbag control unit lost
• B0001 → Driver front airbag squib circuit faulty
• B0010 → Passenger front airbag squib circuit faulty
• B0090 → Left front crash sensor faulty
• B0095 → Right front crash sensor faulty

A single code does not yet prove that the control unit itself is defective. Connectors, wiring or an airbag module may equally be the cause; only testing brings clarity. If possible, enclose the read-out log with the unit you send in.

What part numbers are available for the MG HS 2nd generation airbag control unit repair?

You will find the part number on the label of your control unit; it defines its exact version. Depending on equipment and year of manufacture, the numbers differ within a model series. For the MG HS 2nd generation, state the number you have read in the repair order.

After removal, read the number from the label and enter it in the repair order. This allows your unit to be identified unambiguously. Whether it is actually defective only becomes clear from reading out the fault memory or from testing.

The route to repair: first have the fault memory read out, disconnect the battery and remove the control unit. Then you create a repair order online and send the unit in. Airbag24 repairs your own unit and sends it back. Checking, repairing and testing usually take 3–4 working days at Airbag24.

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.