MG ZR RF airbag control unit repair

What is a MG ZR RF airbag control unit?

The airbag control unit manages the entire restraint system in the MG ZR RF. It registers an accident via the crash sensors, decides which airbags and seatbelt pretensioners deploy, and makes faults visible through the airbag warning light.

In the MG ZR RF (2001 to 2005) it works as an SRS control unit, that is, as the control unit for the entire restraint system. The control unit comes from Autoliv. While driving, it constantly checks the system for faults and reports any irregularity via the warning light in the instrument cluster. If an accident occurs, only milliseconds remain in which it evaluates the sensor signals and decides on deployment.

After an accident the unit stores crash data and locks itself. This also applies to cases in which no airbag deployed. You can tell because the warning light stays on permanently; the restraint system is only ready for use again after the repair.

Why is the MG ZR RF airbag control unit defective?

Most often the cause is crash data that an accident has left in the MG ZR RF airbag control unit, even if no airbag deployed. Other possible causes are aged electronic components, cold solder joints, moisture with corrosion on connectors, and voltage spikes.

An ordinary diagnostic tool cannot remove this stored crash data. Simply clearing the fault memory therefore achieves nothing in this case.

Other damage develops gradually: components wear out over the years, solder joints lose contact, and penetrating moisture makes connectors corrode. Voltage spikes in the vehicle electrical system, for example from a weak battery or incorrectly connected jump leads, also affect the electronics.

You can tell there is a fault when the airbag warning light stays on permanently, the fault memory cannot be cleared, or the diagnostic tool gets no connection to the control unit.

Common error codes for MG ZR RF airbag control unit repair

The codes of the MG ZR RF relate to stored crash data, a full recording memory, lost communication, the firing circuits of the front airbags and the frontal crash sensors. This gives you a rough idea of which kind of fault the system is reporting.

The following codes occur on this vehicle, among others:

• B193E → Deployment recording memory is full
• B1932 → Frontal deployment data (crash data) stored
• U0151 → Communication with the airbag control unit lost
• B0001 → Driver front airbag, squib circuit stage one faulty
• B0010 → Passenger front airbag, squib circuit stage one faulty
• B0090 → Left frontal crash sensor faulty
• B0095 → Right frontal crash sensor faulty

Error codes are read out with a diagnostic tool. A single code does not prove, however, that the control unit itself is defective, since connectors, wiring or an airbag module can equally be to blame. Only the inspection shows where the fault lies.

Attach the read-out report to the unit you send in.

What part numbers are available for the MG ZR RF airbag control unit repair?

The part number on the label of the control unit defines the exact version. Depending on equipment and year of manufacture, the numbers also differ within the MG ZR RF model range.

The following numbers are known for this vehicle, although the list need not be complete:

• YWC001180 (Autoliv)
• YWC107010

Compare the number on your unit with this list. This only ensures that it is the matching unit. Whether it is actually defective only becomes clear from reading out the fault memory or from the inspection at Airbag24.

The route to repair begins with having the fault memory read out. In the next step you disconnect the battery and remove the control unit. After that you create a repair order online, and finally you send in the unit. Inspection, repair and testing at Airbag24 usually take 3–4 working days. 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.