Electric locking problem and aftermarket stereo issue.

Hi. I have a problem with a few electrical things. I've put a new head unit in and it's storing radio channels but not the sound settings. It's okay after a few minutes when restarting the car but any more than a few minutes, the unit starts again with the demo/factory settings. BUT the radio channels are always saved. Also, the remote locking doesn't work after a few minutes of no engine use. When I open the door with the key, the remote locking then kicks back into life. I've recently had a new battery fitted. I've had experienced stereo fitters scratching their heads with it, all relevant wires have been swapped around the problems persist. Does anyone have any ideas? Thanks.

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Hi vitalhours

vitalhours wrote:I've put a new head unit in and it's storing radio channels but not the sound settings. It's okay after a few minutes when restarting the car but any more than a few minutes, the unit starts again with the demo/factory settings

Common problem. The incorrect wiring changes have been made for the battery backup and 'ignition' live feeds for the C3

vitalhours wrote:Also, the remote locking doesn't work after a few minutes of no engine use. When I open the door with the key, the remote locking then kicks back into life.

This is linked to the above problem where the CL is put into deep sleep because of excessive battery drain due to incorrect wiring to the after market radio.

vitalhours wrote: I've had experienced stereo fitters scratching their heads with it, all relevant wires have been swapped around the problems persist.

All relevant wires are not connected correctly.

vitalhours wrote:Does anyone have any ideas?

If you want to prove my above statement, just remove the aftermarket head unit from the car (disconnect it from the car) and see that the Central Locking goes back to normal. Its a simple test to prove its the radio.


Solution:

Swap pins/wires 4 and 7 over on the ISO power plug is sufficient for low to mid power head units. Or buy the swapping lead on eBay (here)

Any head unit that draws a heavy current will need an extra fused feed to the battery rather than just a swap, but swapping is OK for most like for like radio swaps (power wise).

Thank you for the info, I'll check it out and see how I get on. Much appreciated, have a nice day!

I've purchased that adapter so I'll know soon. Thanks.

Happy ending, thanks for your help.

vitalhours wrote:Happy ending, thanks for your help.

Good new. Thank you for the update. Enjoy your new stereo

Hiya I've got exactly the same problem.
Will this adapter turn off the radio when I turn my car off?
Also do I need another adapter to make my steering control for stereo work?

Davidg86 wrote: ↑Mon Dec 28, 2020 9:28 pm Hiya I've got exactly the same problem.
Will this adapter turn off the radio when I turn my car off?

Yes

Davidg86 wrote: ↑Mon Dec 28, 2020 9:28 pm Also do I need another adapter to make my steering control for stereo work?

Yes, one of these adaptors if your new headunit is SWC compatible.

Hiya really sorry but what does sec compatible mean.
Will this sort my steering wheel control AND turn my radio off when I turn of my car as I have that problem too. Also my key fob didnt work until i put my factory fitted one back in. So I'm guessing it's all related. It's a bloody nightmare.
I was told to come on here as even tho it is all over my head someone on here will be able to point me to what I need

Hello Davidg86

Davidg86 wrote: ↑Mon Dec 28, 2020 11:12 pm Hiya really sorry but what does sec compatible mean.

SWC - steering wheel controls.

You can't make the factory fitted C3 steering wheel controls work with an aftermarket headunit if the aftermarket does not support that function.