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Old 22-09-2010, 14:55   #1
chipsceola
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Thumbs up Rover 75 Symphony audio system

Hi Guys thought I would pass on this little tip (should work with any 75 and any audio system) - when disconnecting the battery it's normal to lose the radio security code, all well and good if you know what it is, but a real pro0blem if you don't!

Answer is to turn on headlights before disconnecting the battery, when you refit presto, all will be back to normal with no need to reset radio.

I know this works because changed battery at my local garage only yesterday, to day the original supplying dealer rang me back as promised having checked their PC system for my code, unfortuneately they could not give me this as not shown on system.

Does anybody know how to retrieve it from the ECU please, or can a MG Rover mechanic tell us what is maximum time battery can be taken off for without the need to rest?

cheers guys,chipsceola
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Old 22-09-2010, 15:16   #2
jimbo
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Quote:
Originally Posted by chipsceola View Post
Hi Guys thought I would pass on this little tip (should work with any 75 and any audio system) - when disconnecting the battery it's normal to lose the radio security code, all well and good if you know what it is, but a real pro0blem if you don't!

Answer is to turn on headlights before disconnecting the battery, when you refit presto, all will be back to normal with no need to reset radio.

I know this works because changed battery at my local garage only yesterday, to day the original supplying dealer rang me back as promised having checked their PC system for my code, unfortuneately they could not give me this as not shown on system.

Does anybody know how to retrieve it from the ECU please, or can a MG Rover mechanic tell us what is maximum time battery can be taken off for without the need to rest?

cheers guys,chipsceola
Hi there and

Normally it is very rare for the Symphony to be code enabled and I truthfully cannot see how it would be retained if the headlamps were left on when disconnecting the battery.

Just my thoughts.

Regards
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Old 22-09-2010, 19:57   #3
simon.h
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Thats a new one on me!
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Old 22-09-2010, 22:05   #4
poppy
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Quote:
Originally Posted by chipsceola View Post
Hi Guys thought I would pass on this little tip (should work with any 75 and any audio system) - when disconnecting the battery it's normal to lose the radio security code, all well and good if you know what it is, but a real pro0blem if you don't!

Answer is to turn on headlights before disconnecting the battery, when you refit presto, all will be back to normal with no need to reset radio.

I know this works because changed battery at my local garage only yesterday, to day the original supplying dealer rang me back as promised having checked their PC system for my code, unfortuneately they could not give me this as not shown on system.

Does anybody know how to retrieve it from the ECU please, or can a MG Rover mechanic tell us what is maximum time battery can be taken off for without the need to rest?

cheers guys,chipsceola

Hiya, although i have the code written in my service manual so no chance of forgetting, that is brilliant, must try it.. Poppy.
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Old 23-09-2010, 11:10   #5
chipsceola
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Originally Posted by jimbo View Post
Hi there and

Normally it is very rare for the Symphony to be code enabled and I truthfully cannot see how it would be retained if the headlamps were left on when disconnecting the battery.

Just my thoughts.

Regards
Hi Jimbo you could be right, but had 2 75's 1st is 1.8 Classic with Harmony (dead battery) the other 1.8T Con. Tourer with Symphony, the first needed radio code re-entered when battery changed - the 2nd retained it's code and mechanic said 'headlights on' to protect ECU. As can't see how ECU could be damaged by disconnecting battery, can only think it protects info stored in ECU while power off.

Chipsceola
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Old 23-09-2010, 13:30   #6
jimbo
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Quote:
Originally Posted by chipsceola View Post
Hi Jimbo you could be right, but had 2 75's 1st is 1.8 Classic with Harmony (dead battery) the other 1.8T Con. Tourer with Symphony, the first needed radio code re-entered when battery changed - the 2nd retained it's code and mechanic said 'headlights on' to protect ECU. As can't see how ECU could be damaged by disconnecting battery, can only think it protects info stored in ECU while power off.

Chipsceola
Harmony's were normally supplied code enabled and consequently your's needed the code entering when the battery supply was interupted.

As I said most if not all Symphony were not code enabled - think it was a dealer option at the time of delivery - truthfully how do you know your's is. Not sure what the ECU the mechanic is refering to, if he means the main car ECU that has nothing to do with the security code of the head unit, if he means one inside the head unit it's a new one on me.

Regards
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Old 23-09-2010, 15:12   #7
chipsceola
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Quote:
Originally Posted by jimbo View Post
Harmony's were normally supplied code enabled and consequently your's needed the code entering when the battery supply was interupted.

As I said most if not all Symphony were not code enabled - think it was a dealer option at the time of delivery - truthfully how do you know your's is. Not sure what the ECU the mechanic is refering to, if he means the main car ECU that has nothing to do with the security code of the head unit, if he means one inside the head unit it's a new one on me.

Regards
Hi jimbo, thanks info about harmony/symphony makes sense, and truthfully no I don't know if my symphony is code protected, just assumed so because when switch on the display of 'code' is same as harmony and indeed most other radio units that are.

Previous cars often had advice/ info to 'unprotect' but these handbooks don't give that option. Anyway must admit I am much happier now, for whatever reason the power was cut and radio still worked. Still don't have a code for it, but not now something I'll worry about until perhaps it fails to switch back on after a battery disconnect - if dealers by default didn't code them, that will hopefully never happen.

chipsceola
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Old 24-09-2010, 08:44   #8
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radio code

Hi

If you require the code for your radio all we require from you is the serial number which is etched on the side beginning with RG, BP or AL or KE.
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