2026 MG3 rear-view mirror USB: Power Only does not identify an infotainment data port

A device plugged into the USB near the rear-view mirror is not recognised by the infotainment system, raising suspicion of a failed port. The Australian MY26 MG3 manufacturer labels this port as power only. Checking its purpose first is more precise than investigating it as a data port.

Do not overlook Power Only

All trims list 1x USB Port Rear View Mirror (Power Only).[Manufacturer table][Q12] This confirms a USB power outlet at the mirror position; it should not be treated as an infotainment data connection.

“Power only” does not give the specific power, connector type or activation rules. Specifications for other front or rear USB ports cannot fill those gaps. [To be verified]

Match device requirements to the port’s purpose

For accessory selection, state whether the device needs power alone or also data, together with existing cables and usage conditions. For a no-power complaint, retain device status and inspection results. Lack of infotainment recognition alone cannot establish port damage.

This article provides no electrical test or protection-bypass method. Connector appearance cannot establish compatibility with a particular dashcam or adapter. [To be verified]

A fitted port does not prove separate availability

Diagnosis should identify whether the request concerns a cable, port-related component or another object. The equipment entry does not break down the mirror, power supply and wiring into parts. One USB port cannot be assumed to be a separately sold module or used as a basis for altering the original circuit. [To be verified]

Scope and verification

This article covers only Australia, MY26 MG MG3, Petrol Vibe, Petrol Excite, Petrol Essence, HYBRID+ Excite and HYBRID+ Essence.[Scope reference][Q12] The cited product specifications identify functions and parts; they are not fault or replacement criteria.

No public data was available in the reviewed material for the port’s specific type, voltage, current, power, protection or activation logic; accessory compatibility, repair parameters, diagnostic criteria, OE numbers, separate parts availability or interchangeability. [To be verified] Check compatibility or interchangeability using the VIN and the local Australian manufacturer parts catalogue.

For the parts discussed here, use the parts enquiry page.

[Q12]: https://mgmotor.com.au/brochures/MG3_2026_v3.pdf