SRS trouble on the MGF & TF

Fixing the seatbelts and airbags.

If the warning light for the supplemental restraint system (SRS) illuminates on the dashboard of an MGF or TF, there are a number of problems that could have arisen. The components that make up the SRS include the seatbelt tensioners, where the wiring can get trapped or disturbed by the seat, especially if it’s moved forwards and backwards repeatedly. Sometimes, the SRS light only appears when the seat is in a certain position, suggesting its wiring is damaged. If the seatbelt tensioner has failed, they are straightforward to test and just as easy to replace.

Another component that causes issues is a coupling that sits behind the steering wheel. It provides the wiring for the airbag and can get worn over time through use of the steering wheel. If the horn doesn’t work, it’s likely the coupling has failed.

According to marque specialists MGFNTF Bitz, the coupling is designed to last for 5-10 years, and while secondhand couplings can be bought for £10-£12, a new one only costs £35 from them. Steering wheel airbags appear to be a little more robust, so used ones are plentiful and cost just £5.

At the heart of the SRS is a control unit, which has been known to fail, although not as frequently as the coupling and seatbelt tensioners. The unit is hidden away behind the centre console.

Identifying the cause of an SRS fault is possible with diagnostic equipment, but when we tried to pinpoint such a problem on a 1996 MGF, there were no fault codes logged for this system, so we had to rely on a process of elimination. Consequently, MGFNTF Bitz sell a used SRS pack for £20, which includes a control unit, seatbelt tensioners and an SRS coupling to help identify and fix the problem.

Disconnect the battery and leave it for at least 15 minutes before starting the job, to help keep static electricity away from wiring plug connectors.