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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Professional Radio doesn't work anymore



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      01-27-2018, 07:27 PM   #1
bmwhitman
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Professional Radio doesn't work anymore

I recently did some coolant bleeding procedures (twice) and did not have a battery charger hooked up. A few weeks later my radio screen went entirely dark.

I tried scanning with the BT tool and noticed that the tool does not recognize the radio module.

I have the Junction Box fault A731 - Bistable relay signal is below threshold.

I tried charging the battery recently hoping that it would correct the situation. My BT tool said by voltage IBS is 8.16 Volts. I assume this too low?

Would replacing the Bistable relay in the junction box (30g relay black) fix this issue or is this a battery issue?
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      01-30-2018, 01:45 PM   #2
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Quote:
Originally Posted by bmwhitman View Post
I recently did some coolant bleeding procedures (twice) and did not have a battery charger hooked up. A few weeks later my radio screen went entirely dark.

I tried scanning with the BT tool and noticed that the tool does not recognize the radio module.

I have the Junction Box fault A731 - Bistable relay signal is below threshold.

I tried charging the battery recently hoping that it would correct the situation. My BT tool said by voltage IBS is 8.16 Volts. I assume this too low?

Would replacing the Bistable relay in the junction box (30g relay black) fix this issue or is this a battery issue?
*Bump*
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      02-01-2018, 08:04 AM   #3
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Perhaps these people could advise you..?

https://www.ebay.co.uk/itm/BMW-CD73-...53.m1438.l2649
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      02-01-2018, 11:04 AM   #4
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Start by putting your battery on a charge then clearing your codes.

How old is the battery?
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      02-02-2018, 12:59 AM   #5
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Quote:
Originally Posted by opjose View Post
Start by putting your battery on a charge then clearing your codes.

How old is the battery?
Battery is about 5 years. I charged it twice but only able to get 8.16 volts. I think it's too low. Is it possible for my car to shutoff radio so that I'm able to start the car?
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      02-02-2018, 02:36 AM   #6
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Your car will shut off anything it can to shed load if the voltage is too low.

Put your battery on a charger overnight and see if the issue seems to go away after starting your car.
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      02-04-2018, 09:52 AM   #7
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Quote:
Originally Posted by opjose View Post
Your car will shut off anything it can to shed load if the voltage is too low.

Put your battery on a charger overnight and see if the issue seems to go away after starting your car.
I replaced my battery. The radio still doesn't work.
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      02-04-2018, 10:37 AM   #8
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you need to to bring your car to indy bmw electric or download bmw rheingold software or ista software and perform test plan which will be displayed when this error will be read
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