Urgent help needed please - W208 wiring

[Gollom]

Solved - Urgent help needed please - W208 wiring

Aftermarket stereo does not switich off with ignition - am I right in saying that I need to take the unconnected red cable from the connector to something like the live on the cigar lighter?

Also, there are three wires that plug into the cigarette lighter - one brown and 2 pink/green. Would pink/green be live and brown ground?

Many thanks!

 

[Gollom]

Aftermarket stereo does not switich off with ignition - am I right in saying that I need to take the unconnected red cable from the connector to something like the live on the cigar lighter?

Also, there are three wires that plug into the cigarette lighter - one brown and 2 pink/green. Would pink/green be live and brown ground?

Many thanks!

Well, thought I had solved it!

Connected the red wire from the back of the sony unit to a pink/green wire that goes into the cigarette lighter. Makes no difference at all - the stereo stays on when I remove the key

What am I doing wrong Oh Wise Ones?

 

[petecb]

did you buy and iso adaptor cable ? if so have a look at where the red and the yellow wires from the back of your sony go to . I also have a sony head unit in my clk and i will have a look to see where they end up on the origional harness , i'll post a pic - if i can

 

[petecb]

pink and green thick wire goes to stereo red, and green and red thin wire goes to stereo yellow

 

[Gollom]

pink and green thick wire goes to stereo red, and green and red thin wire goes to stereo yellow

Green and red? I only see two pink/green wires (plus brown) going into the back of the cigarette lighter

 

[petecb]

pink and green thick wire goes to stereo red, and green and red thin wire goes to stereo yellow

thats from the main stereo harness , if your stereo is working without a switched live then the permanent live and switched live must be bridged somewhere , check that the yellow cable from the back of the stereo doesnt connect to the red one . if you dont , when you find the switched live needed you will energize it with the ignition off aswell.

 

[markmifsud]

Quite often you will find that the red and yellow wires will already come with bullet separators so that you can easily revers the two connections to suit the car.

 

[Gollom]

thats from the main stereo harness , if your stereo is working without a switched live then the permanent live and switched live must be bridged somewhere , check that the yellow cable from the back of the stereo doesnt connect to the red one . if you dont , when you find the switched live needed you will energize it with the ignition off aswell.

Quite often you will find that the red and yellow wires will already come with bullet separators so that you can easily revers the two connections to suit the car.

Ahhh! The light begins to dawn! From memory the yellow wire is connected via a bullet connector and the red wire is free with one half of a connector. So I take the yellow cable coming from the back of the stereo and connect to the loose red cable? Do I then need to make a conenction from th red cable to a pink/green cable going to the cigarette lighter or not.

Apologies for being a bit slow on this - not my forte! A-B-C instructions would be most welcome

 

[markmifsud]

one of them is a perm feed, meant to retain the settings, the other is a switched feed for main power, just put one on the switched, one on perm +v and see what happens, if it still stays on, then reverse them

 

[petecb]

one of them is a perm feed, meant to retain the settings, the other is a switched feed for main power, just put one on the switched, one on perm +v and see what happens, if it still stays on, then reverse them

if you get them the wrong way round it will still turn on and off with the ignition but just wo'nt retain any settings . just try and save a radio staion and then turn on and off . behind the stereo there is a thick pink and green wire this is the switched live as it provides most of the stereo's power , this must be connected to the red wire of the stereo (switched live ) if you get hem the wrong way round you will blow a fuse . the red and yellow wires from the stereo must not connect in any way , if they are disconnect them and use a sepearte permanent feed for the yellow wire. both permanant and switched are behind the stereo in the harness .

 

[markmifsud]

No, if they are back to front, it will either stay on all the time, or work correctly.
If the memory wire is connected to the switched line, then the main wire must be on the perm feed, so will always be on, reverse the wires, you will have memory on perm, and main on switched. The radio will only power up via the main feed, not by the memory wire. Both red and Yellow wires are meant to take a +12v feed, so whilst it will not work as intended, it will not pose any safety issue should they get to make contact.

 

[petecb]

No, if they are back to front, it will either stay on all the time, or work correctly.
If the memory wire is connected to the switched line, then the main wire must be on the perm feed, so will always be on, reverse the wires, you will have memory on perm, and main on switched. The radio will only power up via the main feed, not by the memory wire. Both red and Yellow wires are meant to take a +12v feed, so whilst it will not work as intended, it will not pose any safety issue should they get to make contact.

no to your no .
sony car stereos need 2 12v feeds. with the ignition on both will hav 12v . with the ignition off only 1 will remain energized so the stereo will power down. if the switched live on the stereo is recieving the permanent live from the car , it will draw too many amps for the permanent feed - hence the size of the cabling , so at high volume the stereo will draw more amps than the cable or the fuse will allow. if the power feeds are bridged then the permanent feed will also energize the circuit used for the switched feed. as far as a safety issue , i'd just hope that the fuse protecting the permanent feed has been rated properly cause if it hasn't then the power drawn by the stereo may result in the cables melting and/or setting fire , too much resistance in the cable will result in heat - generally a bad thing in small cables in confined spaces. The permanent feed should never be used to power such a piece of equipment with a high power usage , but only to be used as an auxillary feed as it was meant to .

 

[markmifsud]

The existing perm feed is what is used to power Comand, so I doubt there is any reduction in available current, which of course would be protected for over current by the fuse

if both of the yellow and Red wires were connected to the same source, either switched or perm, it would have no effect on the other circuit, there was no mention of bridging the actual supply lines together, nor mention of Sony (although Sony is the same as any other after market system, requiring 1 x perm for main power, and 1 x switched for memory)

He has it solved now anyway

 

[jaymanek]

Ive often come across this with newer cars with CAN.. i.e that there is no ignition feed and the constant feed is the wrong colour when using an ISO adaptor!

Anyway, easiest thing is to use the ignition feed from the cigar lighter and the permanent feed at the ISO but you will need to swap the red/yellow at the ISO plug so that it works...
A lot easier with a simple multi meter or even just an electrical tester screwdriver thingy.

 

[mercedescl500]

This might be of some help, diagram included !. Linky

Signal to Noise:Head Units - Marcus Fitzhugh

HTH.

 

[markmifsud]

Also, to help make this clearer, a section of a Sony installation diagram

 

[Gollom]

Also, to help make this clearer, a section of a Sony installation diagram

http://img169.imageshack.us/i/sonywire.jpg/

All the help is fantastic. However I am now totally confused! So in A-B C language

With a Sony unit I need to follow schematic B?

Does a connection need to be made from any wire(s) to my cigarette lighter? If so, which colour(s)?

Thanks everybody!

 

[petecb]

personally i'd stick with the intended harness ,
yellow from stereo to red/green , and red to pink/green .
this way your using the wiring as intended and also as rated

 

[rossyl]

All the help is fantastic. However I am now totally confused! So in A-B C language

With a Sony unit I need to follow schematic B?

Does a connection need to be made from any wire(s) to my cigarette lighter? If so, which colour(s)?

Thanks everybody!

Hi did you ever resolve this, as I have the same issue. My headunit (Sony) is always on.

Which schematic did you follow on the Sony diagram shown on this thread?

I have a Kenwood head unit that i'd like to hook up, but that does not even turn on. It makes a whirring noise, but that is it. It does not turn on.

Cheers

 

[rossyl]

All the help is fantastic. However I am now totally confused! So in A-B C language

With a Sony unit I need to follow schematic B?

Does a connection need to be made from any wire(s) to my cigarette lighter? If so, which colour(s)?

Thanks everybody!

Hi did you manage to resolve this? If so which schematic did you follow on the Sony diagram shown in the thread.

I currently have a Sony head unit that alwasy stays on, and would like to sort this out.

Also, I have a Kenwood unit that only makes whirring noises when plugged in - it does not turn on. Again probably a power issue.

Would appreciate your response.

Cheers