Replacing Head Unit
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=40625
Printed Date: April 29, 2024 at 11:41 AM
Topic: Replacing Head Unit
Posted By: mhtnyc
Subject: Replacing Head Unit
Date Posted: October 10, 2004 at 12:20 PM
Hi, I'm trying to replace the stock head unit from a 2000 Hyundai Elantra GLS with a new CD player. I bought a harness to go from the Hyundai plug to the back of the new head unit (ISO). I've checked wiring diagrams, and everything checks out. However, when I fire everything up, the lights in the buttons come on, but there's nothing on the display and no sound. I brought the unit back to the store where I bought it, the guy tested it out, and everything worked perfectly there. When I put the stock unit back in, it works fine. I did notice that the stock unit had a 7.5 amp fuse in the back, while the new unit had a 15 amp fuse. The fuse panel had a 10amp fuse in the radio slot. I replaced that with a 15, but it didn't help. Does anyone have an idea as to what might be going on? Thanks!
Replies:
Posted By: Velocity Motors
Date Posted: October 10, 2004 at 1:40 PM
Where did you ground the HU to ? Did you use the OEM ground or did you ground it elsewhere ? Check to make suer that the ground is good. All that is required to make the HU function properly is the switch ignition, constant and ground. If all these are properly connected, you shouldn't have any problems with the display.
-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: mhtnyc
Date Posted: October 10, 2004 at 2:30 PM
Thanks for responding! The connector in the car has a black lead that according to the schematic is the ground. However, there is also a single black wire with a female flat blade connector that attached to the chassis of the stock radio. Should I attempt to use THAT one as the ground instead? I'm still stumped, though as to why the buttons on the unit would light up but nothing else, if there's power getting to the unit.
Posted By: mhtnyc
Date Posted: October 11, 2004 at 8:40 AM
I went and got a tester. I ran the voltmeter from the ignition wire to ground and from the battery wire to ground. Both times I got readings of a bit over 12v. I also did not connect the speakers so as to avoid any possible issues there. Still the same problem. I'm totally stuck. I'm almost at the point of giving up, but not yet.
Posted By: Alpine Guy
Date Posted: October 11, 2004 at 9:23 AM
use that extra lil ground wire you said there was. Thats all you need. Right now you just don't have a strong enough ground.
-------------
2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: mhtnyc
Date Posted: October 11, 2004 at 12:49 PM
Alpine Guy wrote:
use that extra lil ground wire you said there was. Thats all you need. Right now you just don't have a strong enough ground.
I tried that. Same result. The buttons light up, but no display and no sound.
Posted By: Thack79
Date Posted: October 11, 2004 at 2:01 PM
Does the car have a factory amp? What kind of CD player?
Posted By: mhtnyc
Date Posted: October 11, 2004 at 2:52 PM
All there is in the car are 4 speakers: one in each front door, and one on each side behind the rear seats. The CD player is a Roadstar CD-655USWM/FM (Swiss brand). Nothing fancy; 4x40 watts.
Posted By: chevyman26
Date Posted: October 12, 2004 at 1:12 AM
Maybe try cutting the ground wire off of the harness and connect it to a known good ground. Use your meter to make sure that the resistance between your ground point and the batt. neg. terminal is less than 1 ohm.
-------------
You'd better get me out of this lord... or else you'll have me to deal with. -- Hunter S. Thompson "F.A.L.I.L.V."
Posted By: fatgotti
Date Posted: October 12, 2004 at 6:13 PM
Try unplugging the harness right from the back of the deck and check the voltage right at the point of the deck especially the ignition wire I have found that some Clarion decks light up like you are saying when the constant is hooked up but the ignition is not getting power. ------------- Fatgotti Yeah my name is John and I am FAT!! YEAH BABY
Posted By: customsuburb
Date Posted: October 12, 2004 at 7:36 PM
Put that 10 amp fuse back! You should never replace fuses in the fuse box with higher ones.
-------------
Posted By: mhtnyc
Date Posted: October 14, 2004 at 6:01 AM
I don't believe it. I found the problem. Today I took the car to the shop to deal with a transmission problem. While I was there, I brought up this problem. Naturally, I plug the new HU in, and it works!! I go back home to finally finish this nightmare, and it doesn't work. Here is where the problem was: The new HU came with a sleeve. You mount the sleeve to the car, then slide the HU in. However, in my car, there's nothing back there on which to mount the sleeve. So, I took the 90° angle brackets off the old HU, and mounted them on the new one, not using the sleeve. Apparently, there's something involving the sleeve and the clips mounted to the HU that causes it not to work if not connected. Which leaves me back at square one...trying to figure out how to mount it WITH the sleeve intact. Thanks to everyone for their help in this so far! Mike
|