Professional Radio doesn't work anymore

bmwhitman · 01-27-2018, 06:27 PM

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?

bmwhitman · 01-30-2018, 12:45 PM

Quote:

Originally Posted by bmwhitman

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*

Phil325i · 02-01-2018, 07:04 AM

Perhaps these people could advise you..?

https://www.ebay.co.uk/itm/BMW-CD73-...53.m1438.l2649

opjose · 02-01-2018, 10:04 AM

Start by putting your battery on a charge then clearing your codes.

How old is the battery?

bmwhitman · 02-01-2018, 11:59 PM

Quote:

Originally Posted by opjose

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?

opjose · 02-02-2018, 01:36 AM

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.

bmwhitman · 02-04-2018, 08:52 AM

Quote:

Originally Posted by opjose

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.

ptpending · 02-04-2018, 09:37 AM

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

01-27-2018, 06:27 PM	#1
bmwhitman Private First Class 52 Rep 178 Posts Drives: E90 Join Date: Aug 2011 Location: Toronto iTrader: (0) Garage List 2025 BMW G80 M3 Com ... [0.00] 2006 BMW 330i (E90) [0.00]	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?
	Appreciate 0 Tweet Quote

02-01-2018, 07:04 AM	#3
Phil325i Brigadier General 645 Rep 3,227 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Perhaps these people could advise you..? https://www.ebay.co.uk/itm/BMW-CD73-...53.m1438.l2649 __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
	Appreciate 0 Quote

02-01-2018, 10:04 AM	#4
opjose Major 247 Rep 1,377 Posts Drives: 335xi Join Date: May 2016 Location: Md iTrader: (0)	Start by putting your battery on a charge then clearing your codes. How old is the battery?
	Appreciate 0 Quote

02-02-2018, 01:36 AM	#6
opjose Major 247 Rep 1,377 Posts Drives: 335xi Join Date: May 2016 Location: Md iTrader: (0)	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.
	Appreciate 0 Quote

02-04-2018, 09:37 AM	#8
ptpending Brigadier General 618 Rep 3,157 Posts Drives: e81 Join Date: Dec 2013 Location: Poland iTrader: (1)	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 __________________ E81 2007 130i 6cylinder Montego blue Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
	Appreciate 0 Quote