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Hi everyone,

So I have been doing some research before I attempt to install my own radio. I have a 2003 C4S with a MOST system, but non bose. So I have to install 4 wires from the head unit to by pass the amp in the trunk. I can not seem to find a good way to enter the trunk. I have attached some picture, and here is where the harness and optical cable enters the trunk.

It looks very tight, how do I put more wires through the gromet? Should I drill the gromet? The red arrow is where the tunnel through the firewall is.

Please advise!

Thanks !



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There should be a grommet under the carpet above the accelerator pedal. If there is not hole in it cut a small one to pass the wire(s).

The grommet comes out on the windshield side of the battery. You may need to remove the battery to get good access.

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Here's a photo from the front, to the left of the battery (as you look at it) The red arrow shows the one Loren refers to, but if you have a Tiptronic you can use the grommet with the green arrow.


Edit - This is a Right Hand Drive car shown, so you may find it to the right of the battery on yours!!

Edited by Richard Hamilton
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Thanks for all the help so far, so the radio is almost installed, after plugging battery back in and instrument cluster back in, when I put car key in ignition to On position, I get all these errors

"oil level indicator failure"

"temperature failure",

"fuel sensor failure"

"oil pressure failure"

"windshield washer fluid level failure"

I checked all teh connection back to the instrument cluster, the Blue, green, gray. All are secure.

What is wrong?

Edited by Neb33
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Are they all "locked in place"?

All of your failures are on the Blue plug. I would remove and re-seat it and make sure it is locked into place.

Thanks Loren, I took everything apart again, and realize the blue plug was not all the way in. Everything works now. Thanks for all your help.

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