I've just got a new car and attached the XR-CA370 to power - but I can not get any lights or anything on the display.
I have followed the connection guide from SONY and connected the black cable to earth and the red and yellow to the 12V+.
I have tried just the red to 12V+ and press reset, nothing.
Just the yellow to 12V+ and press reset, nothing.
AND both red and yellow to the 12V+ and press reset - NOTHING!
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The red wire is for ignition switch power, the yellow is for constant battery, (station and other settings memory). The black is for ground. I got a power converter, 120v ac to 12v dc, from Radio Shack, but I'm not sure they still sell them.
Somewhere along the line you are not receiving a constant power supply to the head-unit. When you turn the key off it is cutting the power to the unit like it is being completely unplugged. Thus the reason it wont remember anything.
It sounds like they messed up your installation. You can confirm their work by verifying that each wire was attached properly.
2005 Pontiac Sunfire Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: Pink
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
Click on this link for a PDF of the installation instructions of the radio (If you don't have the installation guide that came with the radio).
Illumination is the grey wire from the car to the orange with white stripe from the radio.
I suspect that the yellow wire from the car is not connected properly. When the orange wire (constant power from the car) is attached, but not the yellow wire you can insert and eject cds, but it will not turn on. Constant power is used for maintaining the clock and preset radio stations.
If everything looks correct, I would take your car back to the installer and have them correct the issue.
You can order a new faceplate from Panasonic, if that is the problem. (You may find one on ebay, too?) Carefully check the connection before spending anything, as I wouldn't want to suggest spending on something that isn't broken. If you have electronic skills, check the internal connections from the jack to the internal board and every other connection. Also look for cracks in the board. If found, a light coat of solder can fix that up fairly well, and not cost anything.
Of course, this is all a guess, and I would verify everything yourself before doing anything. Good Luck.