No sound after replacing battery

jerrekt · 04-07-2022, 12:36 AM

(Has after market radio)
2011 328i with HIFI
Problem started after replacing the battery.
Audio once worked for a single drive after unplugging and plugging battery but would stop working at the next startup.
Tried replacing the amp.
Speakers would work when using the radio (tones when pressing buttons)

(Haven't coded/reset the new battery yet)
Stumped rn :/ Any ideas?

Luper52 · 04-07-2022, 03:04 AM

Code your battery, that should be a given. It's the only way to get longevity out of it.

As for the sound, do you even get the key-in-ignition tones when you get ready to start the car? If not then a module on your MOST fiber optic loop is bad. If they're all good and blink a consistent red light then your head unit might have an issue.

ctuna · 04-07-2022, 03:25 AM

Measure your battery voltage.

jerrekt · 04-07-2022, 09:28 PM

For key-in-ignition tones, it uses my head unit so I switched it out for the OEM radio and it still has the tones so its definitely not either of the head units. I get a weird static bumping noise from the speakers with the OEM unit. Coding the battery may take a bit. I still have trouble getting inpa to connect and see the ignition.

04-07-2022, 12:36 AM	#1
jerrekt Registered 0 Rep 3 Posts Drives: Bmw 328i 2011 Join Date: Nov 2020 Location: California iTrader: (0)	No sound after replacing battery (Has after market radio) 2011 328i with HIFI Problem started after replacing the battery. Audio once worked for a single drive after unplugging and plugging battery but would stop working at the next startup. Tried replacing the amp. Speakers would work when using the radio (tones when pressing buttons) (Haven't coded/reset the new battery yet) Stumped rn :/ Any ideas?
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04-07-2022, 03:04 AM	#2
Luper52 Second Lieutenant 59 Rep 217 Posts Drives: 2007 BMW 335i E90 Join Date: Sep 2019 Location: Birmingham, AL iTrader: (0) Garage List 2007 BMW 335i [10.00]	Code your battery, that should be a given. It's the only way to get longevity out of it. As for the sound, do you even get the key-in-ignition tones when you get ready to start the car? If not then a module on your MOST fiber optic loop is bad. If they're all good and blink a consistent red light then your head unit might have an issue. __________________ If you found my post helpful, please consider hitting the 'Appreciate' button Instagram - YouTube
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04-07-2022, 03:25 AM	#3
ctuna Lieutenant General 1920 Rep 13,122 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Measure your battery voltage.
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04-07-2022, 09:28 PM	#4
jerrekt Registered 0 Rep 3 Posts Drives: Bmw 328i 2011 Join Date: Nov 2020 Location: California iTrader: (0)	For key-in-ignition tones, it uses my head unit so I switched it out for the OEM radio and it still has the tones so its definitely not either of the head units. I get a weird static bumping noise from the speakers with the OEM unit. Coding the battery may take a bit. I still have trouble getting inpa to connect and see the ignition.
	Appreciate 0 Quote