This content was compiled automatically and has not yet been reviewed by a technician. For reference only.
For reference only. Always confirm part numbers and procedures for your specific vehicle.
Audio and Communication
2025 IM5 road noise with RNC: distinguish noise control, audio and sound insulation parts
Australian MY25 IM5 lists Road Noise Control. Separate noise observations from diagnosis, and keep generic RNC principles distinct from this vehicle.
On a rougher road, noise remains audible in the cabin and the owner asks why RNC does not make it completely quiet. For the Australian MY25 IM5, separating the function name, the sound heard and actual fault inspection helps prevent a noise impression from becoming an immediate microphone or audio parts order.
An RNC listing does not identify a replacement part
The manufacturer MY25 technical table lists Road Noise Control (RNC) for Premium 75 RWD, Platinum 100 RWD and Performance 100 AWD.[Manufacturer technical table][P08]
This confirms the equipment, but its name alone does not mean it should eliminate every sound. An owner still hearing road noise and a repairer confirming failure of a control or audio component are separate matters.
Generic noise control principles help distinguish the items involved
One published HARMAN RNC explanation describes a system that obtains reference signals from accelerometers, generates opposing sound waves for noise cancellation, and uses cabin microphones to feed back error information to adjust the cancellation signal.[Generic RNC technology][P14]
This example shows that noise control can involve more than a single speaker and differs from simply adding sound insulation. It illustrates one generic technical approach. It is not an IM5 system diagram and cannot determine this vehicle's sensor count or procurement list. [To be verified]
Describe the conditions in which the sound occurs
A job card can record the road surface, speed range, seat where the noise is most noticeable and any simultaneous music playback problem. Describe any distinct patterned noise separately so that the repairer can distinguish the concerns requiring inspection.
These records support intake; they do not allow an owner to diagnose bearings, tyres or RNC parts by listening. Normal music playback does not establish normal noise control, and remaining road noise does not justify replacing a microphone first. Parts requirements should follow diagnosis.
Scope and verification
This article covers only the manufacturer Road Noise Control configuration of Australian MY25 IM5 Premium 75 RWD, Platinum 100 RWD and Performance 100 AWD. HARMAN information is used only for general principles. It does not establish that HARMAN supplies IM5 or that IM5 uses the same architecture.[Model year and trims][P08] [To be verified]
No public data was available for this vehicle's RNC supplier, control architecture, sensor count/locations, operating frequency band, test conditions, repair parameters, fault or replacement 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 noise control or audio components identified through diagnosis, use the parts enquiry page.
[P08]: https://mgmotor.com.au/brochures/MG_IM5_Brochure.pdf
[P14]: https://news.harman.com/blog/halosonic%3A-the-sound-of-safety
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