Trouble With Wiring In New Yaris Headunit, Lot Of Pictures, Please Hel

[Blobert]

Hi guys,

I finally got all the parts and pieces to change my double DIN Kenwood unit (that was in the Yaris when I imported from Japan) into a better single DIN unit.

Thanks to the great instructions here I managed to take apart the dash and take out the existing unit without difficulty.

The problem is that the wiring adaptor going into the back of the current headunit seems completely incompatible with the new Sony unit I bought.

Here's the current setup, all the wiring goes in to the Kenwood unit here:

Here's a close up of the current adaptor:

And the input on the Kenwood unit:

Now the problem is that this is nothing like what is on my new Sony Unit:

Here is the input on the back of the Sony unit:

It comes with an adaptor that looks like this:

One end goes into the back of the unit, the other two ends look like this:

Now I have no idea how to connect up the old adaptor to the new unit.

I do not have the skill or expertise required to go re-wiring this setup, is there some kind of adaptor I can get to convert from the current input to the Kenwood unit to the new Sony one?

If so what is it called and where can I get it?

Please let me know, my Yaris is sitting in the driveway in a dismantled state and I'd like to get the new unit put in as soon as possible.

Thanks in advance,

Robert

[T600]

The two connectors in your last pic are standard ISO I believe. You need an adapter to convert your car's loom to ISO.

Autoleads and others make them, and Halfords (+ many others) sell the full range but are unlikely to have the one you want in stock.

Call your local Halfords with car details; they'll probably get it in for you within a few days and cost will be about £15.

[Blobert]

Thanks for the reply,

I found one toyota connector:

I believe the adaptor you speak of would allow this to plug into one of the Sony ISO connections.

The problem is there is not another one, the speaker wires are wired directly into the adaptor going into the Kenwood unit so I think some kind of chopping will be required.

If I were to cut all the wires going into the Kenwood unit as shown here:

And using connector blocks match them up with the wires going into the Sony unit here:

Would it work fine?

Please let me know

Just one more thing, what is the big black cable coming out of the current unit?:

I cannot remove it and do not know what it is.

Do I need to attach it to the Sony unit? How would I do this?

Thanks,

Robert

[T600]

Big round one looks like the aerial lead; should just be a push fit.

You're right, you almost certainly can chop and install that way, and if a previous owner has done that, then you may have to do the same. Is the Kenwood the original head unit, or an aftermarket? If the latter maybe the Toyota speaker connector has been removed and your options are to either hard wire, or else put it back to standard, then use an adapter.

However, if the kenwood is the original unit then I'd expect you to be able to get the leads you need to convert it. My local Halfords has a thick book showing thousands of converter leads that you can buy.

I'd strongly recommend you do it without cutting wires if you possibly can because that will give you a safer, and more reliable solution unless you really know your stuff and make a first class job of any new connections.

[Blobert]

Big round one looks like the aerial lead; should just be a push fit.

You're right, you almost certainly can chop and install that way, and if a previous owner has done that, then you may have to do the same. Is the Kenwood the original head unit, or an aftermarket? If the latter maybe the Toyota speaker connector has been removed and your options are to either hard wire, or else put it back to standard, then use an adapter.

However, if the kenwood is the original unit then I'd expect you to be able to get the leads you need to convert it. My local Halfords has a thick book showing thousands of converter leads that you can buy.

I'd strongly recommend you do it without cutting wires if you possibly can because that will give you a safer, and more reliable solution unless you really know your stuff and make a first class job of any new connections.

Thanks for all the replies.

Where can I unplug the aeriel, it is stuck in where it is wired to the Kenwood unit, will the wider part pull apart?

The Kenwood unit is aftermarket and while one loom remains as shown in the 7th image, the other one (with the 4 speaker wires) has been spliced and goes directly into the Kenwood connection shown in the first image. Thus a Toyota to ISO adaptor will not work, or it will but only for half of the wires.

The problem with getting an ISO to Kenwood adaptor and then going from ISO to Sony is that the adaptors are all sockets on the Kenwood end (to plug into a Kenwood unit). I'd need to get one that is Kenwood plug on one end, such a lead does not exist as far as I can see.

So it seems the only option is to hardwire it cutting the wires going into the Kenwood adaptor and attaching them to the ones going into the Sony unit. I would be able to do this using small connector blocks but apparantly this is going to affect sound quality a lot?

Have no idea how to use crimp connections, are these the ones currently being used by the Sony adaptor? Can the plastic block that the wires run into be opened. Where do I get wire crimpers and the small crimps for the top of the wire? Would this be a lot easier than connector blocks? (I can do those)

Thanks again for all the continued help.

[T600]

You're right I think; you have no choice but to go that route.

That aerial lead looks like some kind of adapter from the thick connection used on the Yaris to the thin wire used on the head unit. I'm surprised it won't come apart, but if it won't then I'd probably just cut it. Ideally leave enough to reach the aerial socket on your new head unit, but if you can't do that you'll have to extend it. If you need thin wire to the new unit's aerial and can trust the connector, then cut it on the unit side of the connector.

Not sure about your connections. You can buy the bits you would need to convert the car to ISO plenty of places - with either push in connections or with leads coming out that you'd need to solder connect. Bear in mind that safety - particularly avoiding an electrical fire is even more important than getting good sound quality. Ask at a car audio forum for better advice on the technicalities.

Have you tried Talk Audio? (talkaudio.co.uk) They seem a very helpful bunch, and often at the big car shows.