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"Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b
Published by nik0
10-02-2009
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"Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

So basically, if you have a Punto like mine (mine's a 51 reg with the 6 speakers+subwoofer system), you will have an ISO connector in two parts, a white part and a black part. The black one is for the speakers, the white one is for power + control signals.

On the top row of the white one, pin 3, is a green and blue wire. This is an ignition switched power connection (as shown in the Haynes manual, and which I confirmed by testing with a multimeter). It is wired through the 7.5A fuse F49 in the interior fusebox. Here is a pic showing the wire:



I connected this to the "switched power" input of the radio. Your colours may be different, but if it's like mine (Pioneer DEH-5000UB ... nice head unit by the way) then the connections are:
Car black (pin 8) --> Radio black (battery negative)
Car red+white (pin 4) --> Radio yellow (THIS IS THE PERMANENT POWER)
Car green+blue (pin 3) --> Radio red (THIS IS THE SWITCHED POWER)

To do this I used a paperclip to pop pin 7 (red wire) out of the ISO socket on the loom that came with the stereo, and poked it back in so as to magically become pin 3, before connecting it to the car. (So no modification to the car wiring was needed, which was nice.)

Here's a pic of the red wire ready to be poked back in to slot 3, to live in its new home above the yellow wire:


I was worried the 7.5A fuse might not be enough, so before I did all this I measured the current drawn by the head unit and it turned out it takes hardly any current from the switched wire anyway (my crappy 2.99 multimeter showed 0.00A, so less than 0.01A... ). Rather, all the current used to power the radio is drawn through the permanent connection. The switched connection seems just to be used as a signal line. This wasn't surprising, since the yellow wire on the loom is big and thick while the red one is quite thin at the head unit end. (All this might not be the case on other radios of course so I would advise checking for yourselfl!!)

So anyway, it's all working lovely, and I'm glad I didn't need to dismantle the steering column and splice the orange wire (although it would have been fun!) Hope this helps.
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Old 21-03-2009   #1
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

This is awsome, works 100%. A lot easier than than wiring it to the cigarette lighter etc...

Top Job
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Old 18-05-2009   #2
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

I need to sort my connection out, i brought an alpine stereo for my 1996 M1 Punto and put all the wires together, but 2 months later my battery died, did a couple of tests and realised it was the stereo draining all the power when the car wasnt in use. atm i have to disconnect the ISO connector everytime i turn off the ignigtion, will this guide help me for my punto?
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Old 21-05-2009   #3
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

yes and it works perfectly
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Old 24-07-2009   #4
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

My problem is that turning the ignition off does not turn the radio off - bad news if you leave the radio on accidentally overnight.

Will this fix that? Why isnt the punto ISO connector done properly in the first place?
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Confused. So what does the radio red (switched) connect to at the moment?
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Old 25-07-2009   #6
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Talking re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Haha, i got my stereo connected straight to the battery and my amp connected to the rear lights ^^
Well, at least now i know there if the bass isn't working i probably didn't turn my lights on ^^
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Old 14-10-2009   #7
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Quote Originally Posted by psychocandy View Post
My problem is that turning the ignition off does not turn the radio off - bad news if you leave the radio on accidentally overnight.

Will this fix that?
Yes.
Quote Originally Posted by psychocandy View Post
Why isnt the punto ISO connector done properly in the first place?
I think because the factory radio is controlled separately (by CANBUS I think). It switches off 20 minutes or so after the ignition.
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Old 17-12-2009   #8
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Quote Originally Posted by exom View Post
Haha, i got my stereo connected straight to the battery and my amp connected to the rear lights ^^
Well, at least now i know there if the bass isn't working i probably didn't turn my lights on ^^
hahahahah
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Old 22-12-2009   #9
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Quote Originally Posted by nik0 View Post
Yes.

I think because the factory radio is controlled separately (by CANBUS I think). It switches off 20 minutes or so after the ignition.
Flippin annoying that they cant use the switched live properly. Number of times I've flattened the battery by leaving the radio on...
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Old 03-01-2010   #10
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Just a quick question:
I just tried this and i couldn't get the red wire out of the black ISO socket. How do you get this out? Wiggle a paperclip around or something?
Many thanks
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Old 18-01-2010   #11
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

since i've done this, everytime i turn the ignition off, and i turn the ignition back on the CD player resets itself and i lose my preset stations and settings. how can i resolve this
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Old 19-01-2010   #12
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

would i be right in thinking i have to move the yellow wire in the radio (permanent power) to pin 4 to link up with the red/white wire in the car which is from the battery? i think this will solve the problem but not100%
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Old 21-02-2010   #13
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

thxs 4 the guide dude, hopefully this will sort my battery flattening problems
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Old 26-02-2010   #14
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re: "Wiring A Punto Stereo To Ignition Using ISO" (yellow red wires) MK2 only not MK2b

Excellent guide, took me two minutes.

Thanks!!
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