2019 Tata Hexa: ASC quotes Rs. 50K for an infotainment system issue

I am facing a weird humming noise from the speakers and tweeter whenever the key is inserted into ignition. The sound increases as soon as I crank the engine and can hear engine noise through speakers.

BHPian Jaeger recently shared this with other enthusiasts.

I own a 2019 Hexa XTA which came with a 7inch touchscreen Harman unit. All of a sudden, I am facing a weird humming noise from speakers and tweeter whenever the key is inserted into ignition. The sound increases as soon as I crank the engine and can hear engine noise through speakers.

Went to Rudra Motors TASS for diagnosis purpose, kept the car with them for more than a day, still they are not able to do an appropriate diagnosis and concluded that its an issue with music system citing they tried installing another 2017/1028 Hexa unit (old 5inch unit with physical buttons) and confirmed that sound is not coming after installing other system.

Unfortunately, I was not physically available over there when they conducted this test and car was already assembled back to its original unit by the time I could reach ASS and have to take their word as is.

Further more, They have the following suggestion

1. Replace the entire Harman unit which might cost be more than 50-75K, as the existing system cannot be repaired or at least they don't have the expertise to get it repaired.
2. Get an after market android unit installed.

Need suggestion to take this issue with TATA\Harman higher management, as this is completely unacceptable for such a flagship premium product. Also, does anyone have good reference for expert car audio technician in Pune who can help me with this diagnosis and repair if possible.

Here's what BHPian ashis89 had to say on the matter:

It seems like the alternator whine. This occurs due to ground connection issue. Please take the car to any good audio shop and ask them to check the ground connection of the audio system.

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