Hello All,
I was helping someone here might recognize my problem on my 2003 XK8 convertible and chime in.
I was out Saturday with the top down and parked for a few hours, when i got back into the car, i noticed the radio (Alpine) display looked very different, it was not dark, but rather had all the displays in a row, such as dolby , can't exactly remember, but it was bright, not scrambled, just was not correct. Please recall the Navigation was working fine at this point.
I did what the internet said to try, which was disconnect. negative terminal to the battery and put it to the positive post of the battery for 30 seconds, which i did.
when i turned the key on everything came back except the radio and navigation, both seem to have no power and the antenna for radio does not come up.
I checked all associated fuses, but they all appear good. I do not have a shop manual currently, but that will change soon.
Oh Yes, I should mention that I do not have a CD for Navigation system, I do not know if that matters or not.

Thank you all in advance for any help you may offer.

Rick

 

Hello again,
so today, still without a manual, I went out and tried working on car again, I opened up trunk and checked battery voltage, it is 12.7 volts.
i then pushed eject button on both Navigation CD and cd changer, both had power, I could hear their motors running, I checked all associated fuses according to owners manual, they were all good, but still no power to stereo head or navigation screen???

I should also mention that about a Week before this failure, the hydraulic motor for the convertible top was leaking, so I took it back to the place I bought it and had it repaired, which they did, however, the first time I dropped the top and put it back up, this is when the Navigation and stereo head unit went dark


thank you in advance for your advice and for time

Rick

 

I can’t speak to how the Nav unit and the head unit are connected. But on my 2002 XKR when my amp was going out the power to the head unit and the nav was intermittent.

when the music finally died for good I bought a used amp and that fixed everything.

Z

 

How were you able to trouble and pin point your issue to amp?
I do not have electrical schematic yet, so can really only check fuses
thank you for your help

 

Suspicious.
"Whenever something goes wrong after work has been done, revisit the work done". Perhaps someone didn't reconnect a connector, or something got snagged. I know the pump is nowhere near the head unit but the NAV and amp are close by.

You can download the Electrical Guide from member Gus' encyclopaedic site:
http://www.jagrepair.com/images/Auto.../jagxk2003.pdf.

 

I’ll have to tell on myself again; I don’t have the brain power (anymore?) to figure out how to test the amp.

But reading the forum there were more than just few people with the same or similar audio issues that were fixed successfully by replacing the amp. So I just took a flyer and bought an eBay amp since the cost was so low. About $36 if I recall correctly.

if you do go that route, make sure the part you purchase has the same part number sticker on it as your original part.

good luck, if you buy a used amp, and that’s not the issue, I’m sure you can sell and not lose a dime.

Z

 

@Momboy - despite your clearly stating 2003 in your initial post, the link I gave was to the 2002 EG.

I've amended my post to include the correct link for the MY2003 EG. My apologies.

 

I honestly don’t know where to start, all I know right now is I have power to the cd changer or Navigation Cd, I think, both the cd changer and Navigation will both eject their magazines and that the fuses associated with radio all all good.
originally I had a weird display on stereo head, but not dark and I could still play music and cd’s, just could not tell which cd was playing, or see radio station display, but radio and nav did still work, then I did a hard reset, every thing came back on line except radio and navigation, both now have no power
where do I even start?
thanks all in advance

rick

 

Oh yes, where is the entertainment control module and Alpine Amp located

thanks all

Rick

 

in my 2002 XKR, with the Alpine system, the amp is in the trunk stacked with the CD player. It’s a 60 minute job to replace.

 

Hello all, so does the power from the amp run the Navigation and radio?
I honestly don’t know where to begin troubleshooting no radio or nav power,
any ideas would be more than greatly appreciated

Rick

 

Am I correct or not, I have a Alpine radio, 320 watt amp and Navigation, it seems the radio head unit, navigation and cd changer all are controlled by Amp, is that the correct assumption?
thanks all,

Rick

 

You need to stop trying to fix this and instead spend the weekend to download, study and understand the wiring diagram/electrical guide that Michaelh posted above. The guide will show you where every single module in the car gets its power, which fuse/relay it comes from, and which ground point in the car the module is connected to.

Trying to diagnose an electrical problem without the electrical guide is like trying to change a wheel when you can't even remember where you parked the car.

 

Brew a gallon of coffee to go with that reading. When you need a break, go over to eBay and order an amp for about $40

yes, it’s following superstition instead of total logic. But the price is right and it would be an easy way to rule in or rule out the amp as an issue.

 

I went to eBay, looks like they are $100, any particular site you recommend, or seller?

thanks

Rick

 

No, not now that they’ve gone up, that’s too bad.

if you decide to go that route try to find a seller that accepts returns, as not all of the do .

I don’t recall my seller, it’s been 3 or 4 years.

Z

 

Have you tried just unplugging the amplifier to see if that makes any difference? You will have to do so anyway if you are going to try swapping it. You could test for power and ground at the connectors while you've got it unplugged also.

 

As an experiment I pulled the fuse for the amplifier and as expected the head unit carried on working fine, just no sound and no CD player.
​

 

Thanks Dibbit, did your radio and Nav work before you pulling fuse, was it the 30 amp in boot/trunk fuse box?

 

Yes the radio/CD is all working fine. The original sat nav head unit is long since gone, but the replacement Garmin is powered from the original power connections and also works fine with the amp fuse in or out.

The fuse I pulled was the #18 30A boot fuse box. If I were you I would unplug the amp and see if anything changes.