3 Jan 2009

Sony CDX-GT270s Wiring (How to Install a Front Loader)

Recently I replaced the rather embarassing Panasonic cassette tape player in my Mercedes 190E with a new sony CDX-GT270 front loader head unit. I was concerned to find that the wire harness supplied with the sony unit did not look exactly like the Panasonic's harness and my enquiries at the electronics shop were met with an attitude of "if you have to ask you really should get someone else to install it for you". But it only required a little research (just to err on the side of caution) and I managed to get it working and save myself a little cash too.

The process was pretty simple in fact, all I needed to do was:
1. Disconnect the negative terminal of the car battery
2. Slide the Panasonic cassette player out of the console using the release keys
3. Cut the wires off the old Panasonic harness one by one and crimp them onto the matching colours on the sony harness
4. Plug the harness into the sony head unit and connect the antenna
5. Slide the sony unit into place
6. Reconnect the car battery

I can't believe I almost paid someone else to do it. You don't even need to know exactly what colour wire does what, but for the sake of being thorough - the car audio wiring standard is as follows:

white : front left (+)
white/black striped : front left (-)
grey : front right (+)
grey/black striped : front right (-)

green : back left (+)
green/black striped : back left (-)
purple : back right (+)
purple/black striped : back right (-)

black : negative / ground
blue : antenna up/down
red : igntition (+)
yellow : battery (+)
blue/white striped : AMP on/off

Useful car audio links:
Sony XR4950X Car Stereo Installation
Home and Car Audio Answers

Download Sony CDX-GT370/s CDX-GT270/s CDX-GT160/s manual
Download Sony CDX-GT370/s CDX-GT270/s CDX-GT160/s installation


KevinS said...

did you connect the ground? or not ?

Rich said...

Yes, I did connect the ground - it's the black wire and has it's own connnection in the harness.