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Mercedes w211 radio head unit is not working .live and earth wires to unit are fine .will i need to replace the head unit.

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2 Suggested Answers

  • 1596 Answers

SOURCE: fitting new head in car

Safer to REWIRE SUB Or Speaker With you own Wire then YOU Determin POS and Ground

Posted on Oct 20, 2010

  • 71 Answers

SOURCE: i have a jvc head

The ground to most electicals is a black wire if its not there you can run a wire to any metal that runs to the frame

Posted on Nov 06, 2010

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1 Answer

How to wire sreaker system


this is the same as a home speaker system, if installing an amp and sub you need to make sure you have a pre-out on your cd/tape/radio head unit. this will look like a red and white hole usally with l and r on it,
you will need to run a male phono to phono lead from the head unit to the amp, You will also need to run a fused live 12v from your battery to the amp live input (red wire) and a remote (usally blue) from your head unit to the amp (make sure you run the live ond remote on opisite sides of the car to the phonos as they can interfere with each other).
you also need to run an earth/ground to your amp, this must not be to long, i normaly just un srew a screw in the boot and connect it to that.
once this is done you can wire up your sub to the amp making sure to match - to - and + to plus.
hope this helps

Jan 02, 2011 | Car Audio & Video

1 Answer

I recently installed the Alpine iDA-X100 model and I am having difficulties with my sub and amp. It works perfectly fine when it's on radio mode, however as soon as I switch it to Ipod it turns my amp...


Hi,

Initially, determine if the remote trigger of the amp is present on both instances; radio and iPod. This would be the blue or blue/white wire from head unit and would read +12VDC when the head unit is turned on. Otherwise, if +12 is present during radio mode but absent during iPod, then it might be that the internal switching would need looking into or a short temporary fix would be to wire a separate power on toggle switch for the amp.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 16, 2008 | Alpine Car Audio & Video

1 Answer

I have a jvc head unit that is replacing the factory radio. all was going well till i cant find the earth the orginal radio had


The ground to most electicals is a black wire if its not there you can run a wire to any metal that runs to the frame

Nov 06, 2010 | Car Audio & Video

1 Answer

I have a 81 grand prix the radio wiring harness is not there thers just loose wires how do i fid the harness to hook the wires back up so i can add an after market harness and cd player


you need a volt meter and 9v battery. earth black contact from meter & then
  1. with ign off probe wire to find a live , thats the memory feed goes to yellow on radio
  2. with ign on probe wires that the constent live goes to red on radio
  3. when lights on probe wires thats the illumination feed (if fitted to car, but not used on many new radios
  4. then get 9v battery and with remaining wires pair and connect to battery, when speaker buzz's mark pair as they are ( ie front right rear left etc ) the speaker wires from the new radio are paired by colour ( one with black stripe with is the negative of the pair)
  5. there should be a ground/earth which if you cant find just hook one to the body/chassis

Jan 03, 2010 | Car Audio & Video

1 Answer

No radio will work in my car: Light just come on that it not even on the screen.


if you've used the loome plugged into the car check that the wires line up and the car has enough wires most new head units have 6 wires while most older cars only have 5 therefore you need to bypass the stereos ignition wire by joining it to the live wire and reconnecting all other wires as they would on the loome

May 12, 2009 | Car Audio & Video

2 Answers

When i turn my radio on my sub makes sounds and backfeeds even when the engine is off. i tried switching the remote wire from my radio to different wires but it either doesn't work or still makes the...


Hi It will be an earth problem or even if your speaker wires or rca leads are running along side any power wires from your car, Find the most chunky metal part of your dash, clear all paint away, make the earth wire from your head unit less than 1 foot from you head unit and make sure its not conected to any earth that run back to your cars power system. if it still makes the noise make sure your speaker wires or rca leads are not running along the cars power wire they will pick up feed from them. make sure your head unit is not earthed to your cars arial silly as it sounds the arial plug in is one of your main earths to your cars audio system. hope you work it out

May 06, 2009 | Car Audio & Video

2 Answers

Hi , I just brought a KD-G646 head unit and it wont play cd's at all. The radio works fine, but the usb only works if the unit is turned down. Could i have something wired wrong or is the unit faulty. It...


well, the USB problem i cant help you with, but if the cd isnt loading, theres probably something wrong with the loading mechanism, which usually means that the unit is faulty. it would be more cost efficient to buy a new head unit than to pay someone for the parts and labor to repair the one you have.

Aug 18, 2008 | JVC Car Audio & Video

1 Answer

Hi, i just installed my pioneer head unit into my new astra gsi, but everytime i switch the engine off, the unit resets itself and all of my settings. i used to have this unit in my fiesta and it...


yes the wiring is different on the back of the head unit you have a black (earth) red (power) and yellow (memory) you will have to find you memory in the cars wiring it goes to straight power , also you can join red a yellow together and take it to the positive of the battery but you can only turn the cd player on and off but the actual unit its self .

Jun 30, 2008 | Pioneer Car Audio & Video

2 Answers

Car stereo installation speakers


Your old unit was a common ground unit meaning all speaker grounds as well a radio ground were the same. The new unit should NOT be connected to this wire configuration. Newer units change the potential difference of the speaker power meaning that the - wire of the unit may have negative 24v on it so IT CANNOT BE REFERENCED TO EARTH OR CHASSIS GROUND.

I would recommend rewiring the speakers to the radio for best reliability and sound quality.

Dec 31, 2007 | Jl Audio 12W3 Car Subwoofer

8 Answers

Kenwood car stereo KDC-W3534 : warning message PROTECT


i had the same problem and i just disconnect the battery and and reconnect it and everything works fine!! try it

Dec 19, 2007 | Kenwood KSC-310CCS Center Channel Speaker...

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