General How to Get stereo to turn on/off with ignition/time?

[Almurray42]

Hi there guys, I have seen a similar question asked and I believe a solution was given where you can swap a couple of wires around and the non standard stereo would turn off when you turn the ignition off, BUT you HAVE to have the ignition on to use it! The car is a 51 plate Punto Go Mk2 1.2L 3Door
These are the requirements I am looking to get;
1: Stereo Turns On When Ignition is turned on
2: Stereo Turns Off When Ignition is turned off
3: Pre-sets are not lost when Ignition or stereo are turned off
4: Ability to still manually turn on and off the stereo when the ignition is not on
5: Ability to still manually turn on and off the stereo when the car is running

I know this is possible as it works in most other cars, But I am really stuck on how to do it for my punto... Are there kits available? I can't stand having to manually turn off the radio everytime I get out, but I still want to be able to use the radio for say; 1hr when the keys are not in.... The timing bit really doesnt bother me I just need these requirements!

Thankyou in advance to anyone who contributes and when we reach a solution I will make a tutorial for all to see

Cheers!
¬Al

 

[s and b]

this would all work with a factory radio but you are asking too much from the aftermarket
best is have radio come on if wired from say the fusebox ignition live side

 

[Tony123]

There will be a yellow and red wire on the stereo.. swap these over

 

[leebex]

thats handy to know, bugs me that the aftermarket sterio in my hgt wont come on unless the ignition on.
would prefer the standard sterio myself as the 20 min or so timer is superb with standard fit fiat radios.

 

[Almurray42]

Right okay so without any additional components this is impossible, however i reckon with some research and he right components I can get it to work.
I believe that there are two wires available in the stereo loom;
12v Direct to battery,
12v Ignition switched live.

In order for the stereo to save the pre-sets, I think It will need constant supply voltage; direct from the battery, however this means it would not switch with the ignition.

If there is some way for me to make a circuit that effectively gives the stereo "Full power" (To turn on) when the ignition goes on as-well as when you manually turn it on, And the reverse to happen when you turn it off.... Then I will do my best.

So basically In order to work out how to do this I need to know the requirements of the additional circuit.
So;
1: Which requirements can the stereo fulfil already?
- EITHER
3,4,5

- OR
1,2,5

So depending on the method I choose the circuitt will need to do the following:

EITHER:

Enable automatic ignition switching

OR:

Enable Stereo to be turned on when car is not running +
And keep the radio presets.

 

[Almurray42]

So after a quick think I reckon it would be easier to go with the first option.
So I will need to find out how I can enable automatic ignition switching with the stereo.

In order to do this the circuit will need to "Trick" The stereo into thinking it is being turned on or off with the ignition, so;

When The Power from ignition live is first powered up; Press the on button.
When the power from the ignition goes; Press the button.

^
The above requirements could work BUT I think If I were to turn the stereo off whilst the ignition is on, when I turn off the ignition, the stereo would then come on.

SO...
I need to find out a couple of things; How does the Stereo Register the fact that the user has pressed on/off (Either a single electrical current or a physical connection break)

Its late so I may be talking SH*T but I hope I am on track go get this cracked!

 

[Almurray42]

best is have radio come on if wired from say the fusebox ignition live side

Which of my requirements would this fulfil? I mean would I be able to use it when the ignition is off? + Would I lose the radio presets?

Sorry about the late reply, have been very busy

 

[s and b]

Which of my requirements would this fulfil? I mean would I be able to use it when the ignition is off? + Would I lose the radio presets?

Sorry about the late reply, have been very busy

theres only 1 12 volt constant live to the radio
ignition off
thats why i said find a switched live in fuse box so radio only works via ignition on
of course you could easily have a switched permanent live run through say a toggle switch on the dash

the original fiat radio works by circuit board and basic canbus to get its switched live

 

[Almurray42]

theres only 1 12 volt constant live to the radio
ignition off
thats why i said find a switched live in fuse box so radio only works via ignition on
of course you could easily have a switched permanent live run through say a toggle switch on the dash

the original fiat radio works by circuit board and basic canbus to get its switched live

Right okay, so I basically could wire up a toggle switch to the switched + constant live, but will this keep the presets??

 

[PuntoHowTo]

these threads annoy me, having spent years fitting car radios to cars it really is very simple

any aftermarket radio need 3 connections minimum to power on.

constant live - this power the radio when in use and keeps the presets held, cd position in memory.

Switched live - tells the head unit if the ignition is on or not.

ground or negative.

then you may have a couple of connections for electric aerial and telephone mute etc.
(I am ignoring the speaker wires as thats pretty obvious)

fiat standard radio has 1 live a ground and 2x can-bus network connections, basically the radio switches on and off with the ignition because the cars computer tells the radio that the car has been switched on, its a digital signal which can't be tapped by cheap aftermarket radios.

what this means is to switch the aftermarket radio on and off with the ignition you need to add your own ignition live (switched live) to let the radio know when the ignition is on or off. this is easily done with a patch wire from the cigarette lighter socket on a mk2 punto as the fag lighter is switched with the ignition.

going back to your original list

1: Stereo Turns On When Ignition is turned on all after market stereos will do this if fitted properly
2: Stereo Turns Off When Ignition is turned off all after market stereos will do this if fitted properly
3: Pre-sets are not lost when Ignition or stereo are turned off all after market stereos will do this if fitted properly
4: Ability to still manually turn on and off the stereo when the ignition is not on some after market stereos will do this as part of its additional features
5: Ability to still manually turn on and off the stereo when the car is running all after market stereos will do this if fitted properly

So number 4 is really the only one you can't be sure of, its dependent on the radio you buy.

my biggest fear is you have no idea what you are doing and by the week out you will have hacked the wiring in your car about and be wondering why the car won't start or why the wipers work when you put the car in reverse

 

[Almurray42]

these threads annoy me, having spent years fitting car radios to cars it really is very simple

any aftermarket radio need 3 connections minimum to power on.

constant live - this power the radio when in use and keeps the presets held, cd position in memory.

Switched live - tells the head unit if the ignition is on or not.

ground or negative.

then you may have a couple of connections for electric aerial and telephone mute etc.
(I am ignoring the speaker wires as thats pretty obvious)

fiat standard radio has 1 live a ground and 2x can-bus network connections, basically the radio switches on and off with the ignition because the cars computer tells the radio that the car has been switched on, its a digital signal which can't be tapped by cheap aftermarket radios.

what this means is to switch the aftermarket radio on and off with the ignition you need to add your own ignition live (switched live) to let the radio know when the ignition is on or off. this is easily done with a patch wire from the cigarette lighter socket on a mk2 punto as the fag lighter is switched with the ignition.

going back to your original list

1: Stereo Turns On When Ignition is turned on all after market stereos will do this if fitted properly
2: Stereo Turns Off When Ignition is turned off all after market stereos will do this if fitted properly
3: Pre-sets are not lost when Ignition or stereo are turned off all after market stereos will do this if fitted properly
4: Ability to still manually turn on and off the stereo when the ignition is not on some after market stereos will do this as part of its additional features
5: Ability to still manually turn on and off the stereo when the car is running all after market stereos will do this if fitted properly

So number 4 is really the only one you can't be sure of, its dependent on the radio you buy.

my biggest fear is you have no idea what you are doing and by the week out you will have hacked the wiring in your car about and be wondering why the car won't start or why the wipers work when you put the car in reverse

Sorry to be a pain, I'll try patching it to the cig lighter + Then post back.

 

[Ziggy122]

My Ripspeed unit does pretty much all that

no battery drains
No loos of memory

Only thing it wont do is turn off with ignition, but i remove the facia anyway - no problems

ziggy

 

[SouLz]

Ive tried everything on my stereo. I have a sony explode - ive tried yellow to red, red to red, yellow and red to yellow.

None of them turn off with ignition and the stereo can be used without keys in on all of those..

 

[danielb]

I've got a Sony Xplod that turns on and off with the ignition. The punto already has a switched live connection going to the stereo its just in the wrong pin. All I did was to remove the "switched live" pin from the stereo to car adapter, and then tested the pins on the car with a multimeter to find which one was switched. Then put the pin into the correct hole if that makes any sense.
(I did find pictures of how to do it somewhere I'll have a look)

Dan

EDIT:
* Guides section
* Search stereo
* First result
https://www.fiatforum.com/punto-gui...ereo-ignition-using-iso-yellow-red-wires.html

 

[SouLz]

I've got a Sony Xplod that turns on and off with the ignition. The punto already has a switched live connection going to the stereo its just in the wrong pin. All I did was to remove the "switched live" pin from the stereo to car adapter, and then tested the pins on the car with a multimeter to find which one was switched. Then put the pin into the correct hole if that makes any sense.
(I did find pictures of how to do it somewhere I'll have a look)

Dan

EDIT:
* Guides section
* Search stereo
* First result
https://www.fiatforum.com/punto-gui...ereo-ignition-using-iso-yellow-red-wires.html

So on mine i have a red and blue connectors into iso's - I simply remove the red end from the connector going into the block that connects to the cars loom and attack it into the blue/green pin in the white block? Also do you have to remove this blue/green wire or just add with it.

EDIT: fixed - works

 

[PuntoHowTo]

I've got a Sony Xplod that turns on and off with the ignition. The punto already has a switched live connection going to the stereo its just in the wrong pin. All I did was to remove the "switched live" pin from the stereo to car adapter, and then tested the pins on the car with a multimeter to find which one was switched. Then put the pin into the correct hole if that makes any sense.
(I did find pictures of how to do it somewhere I'll have a look)

Dan

EDIT:
* Guides section
* Search stereo
* First result
https://www.fiatforum.com/punto-gui...ereo-ignition-using-iso-yellow-red-wires.html

Fantastic! that guide suggests using pin 3 off the main ISO power connector, on a normal car this is a switched live for a subwoofer (switched by the radio not the car) to tell the sub when the radio is on. On the mk2 punto it's the CAN-A line digital connection to the cars body computer. Using this to turn your car radio on and off is like to result in a very expensive repair bill for a new body computer (about £350 from the fiat dealership coded to your car) follow that guide at you own risk, you may end up regretting it

The Haynes manual is actually wrong

 

[danielb]

Fantastic! that guide suggests using pin 3 off the main ISO power connector, on a normal car this is a switched live for a subwoofer (switched by the radio not the car) to tell the sub when the radio is on. On the mk2 punto it's the CAN-A line digital connection to the cars body computer. Using this to turn your car radio on and off is like to result in a very expensive repair bill for a new body computer (about £350 from the fiat dealership coded to your car) follow that guide at you own risk, you may end up regretting it

The Haynes manual is actually wrong

:worship::worship::worship:
Ignore me then
Is there anyway someone could add the "follow that guide at you own risk, you may end up regretting it " to the guide itself. I would've appreciated knowing that I just wired the car to die .
Stereo (switched wire) now rewired to the switched 12V at the window switches. Stereo now stays on until the door is opened or the timer... finishes? .
Is that a problem?
Dan

 

[s and b]

:worship::worship::worship:
Ignore me then
Is there anyway someone could add the "follow that guide at you own risk, you may end up regretting it " to the guide itself. I would've appreciated knowing that I just wired the car to die .
Stereo (switched wire) now rewired to the switched 12V at the window switches. Stereo now stays on until the door is opened or the timer... finishes? .
Is that a problem?
Dan

what it is is that the car you are rewiring is 11 years old ad so myself and andy dont really see these anymore other than being hoisted into the pit of doom
the ones we see and particurlarly the later mk2b versions will indeed cause expensve problems if a live is fed backwards via the iso plug

the easiest way to confirm if you have more than one 12 volt live via a switched ignition is with a good old multimeter,if you did indeed use one on a later punto you will find only one 12 volt supply

thanks for laughing i just like andy try and help and stop people making expensive mistakes but what the heck we can clean up and charge you plenty when punko no starty and you come bleating our way we come in peace not shoot to kill

 

[danielb]

what it is is that the car you are rewiring is 11 years old ad so myself and andy dont really see these anymore other than being hoisted into the pit of doom
the ones we see and particurlarly the later mk2b versions will indeed cause expensve problems if a live is fed backwards via the iso plug

the easiest way to confirm if you have more than one 12 volt live via a switched ignition is with a good old multimeter,if you did indeed use one on a later punto you will find only one 12 volt supply

thanks for laughing i just like andy try and help and stop people making expensive mistakes but what the heck we can clean up and charge you plenty when punko no starty and you come bleating our way we come in peace not shoot to kill

The pin I used that Andy said is the "CAN-A line" showed up as 12V with the multimeter though.
I understand that CAN lines should be left alone and any feedback is not a good idea I'm in my last year of my degree, Automotive Electronic Engineering I just don't know these car's very well and didn't realise the factory stereo used CAN. I just wondered how the power window timer worked? and if its "safe" to switch using that.
Dan

 

[PuntoHowTo]

The pin I used that Andy said is the "CAN-A line" showed up as 12V with the multimeter though.
I understand that CAN lines should be left alone and any feedback is not a good idea I'm in my last year of my degree, Automotive Electronic Engineering I just don't know these car's very well and didn't realise the factory stereo used CAN. I just wondered how the power window timer worked? and if its "safe" to switch using that.
Dan

Windows power is switched on and off by the body computer, you should find the radio won't switch off until the time out period of about 2 mins or the door is opened (I forget what point it switches off the windows?) any how its most likely safe and won't cause any damage, although it would annoy the crap out of me! all for the sake of a 24inch piece of wire from the fag lighter socket?

the connection diagram printed on the label on top of the factory radio is generally a good place to look if you're unsure

factory radio uses CAN to know when the ignition is on or off and takes a speed signal to adjust volume in relation to speed it also is integral to the security of the car radio, put it in a different car and it won't work