I have a 97 astro van and I installed a pioneer deh-2000mp stereo in it ,,,the stereo came from a different car and worked fine.
but since I installed it, it will work fine while idling in the parking lot but as soon as I drive a couple of feet I loose the audio but the display is still on ,,,,any suggestions to what I can do to fix it SAD
Replies (6)
swez on 04/21/2009 07:12:01
Welcome to CK!
It seems there is a basic wiring problem to correct and perhaps installing a dedicated ground wire to insure the new HU is fully operational. Here is the GM wiring color codes for the stock radio:
http://www.the12volt.com/installbay/stereodetail/454.html
There are 16 wires in all to be checked. The ILL and Dimmer lines can be disconnected for now to simplify your quest.
The easy ones are the 8 speaker lines. Once those are out of the way, the rest is whittled down to the key power and memory functions of the HU.
Did you buy/use a HU conversion harness for this install? These are cheap, easy to find and vehicle specific. Most common HU brands use the same color codes too.
Finally, a dedicated ground wire is very important for Aftermarket HU's. If that is not used, the grounds we rely on are the antenna and the wiring harness. Neither are as reliable as a direct ground to bare metal in the floor pan or firewall. In your case, it seems like the antenna is now the primary ground and as soon as the vehicle is moving, that ground is ineffective.
The other thing to consider is the physical connections for your main wires. Here, barrel type crimp connectors are a good choice for wire joints. (Wrapping bare waire and taping it off, are not good practice as tape tend to go soft in hot weather and gets loose in cold weather)
Comments/Questions?
Swez
ttocs on 04/22/2009 15:04:01
I would check your speaker connections. Pioneers will shut the amp down if any of the speaker wires ground out to keep from blowing an amp. If you replaces speakers recently check behind them.
swez on 04/22/2009 15:52:37
Good to see ya back on CK there ttocs! Was getting kinda slow here the past week while you were away.
How's the job hunt going? (Terrible mess here in MI) Lots of bogus ads and MLM companies scamming those who can least afford to pay to get a look at their scam deals... after one has paid good money to review a lousy deal, they cannot get their $$$ back easily.
Beware!
Swez
soundbuilder on 04/22/2009 20:27:40
hey guys
so this is what I've done
ran a dedicated ground = not fixed,,,,lol I was hoping it would be that easy
ran a dedicated power line from the battery = not fixed
disconnected the rear speakers and went for a very short drive,,,lol nota
with the front speakers disconnected = unsuccessful
finally I went into the basement and dug out a car speaker I have had for years hooked it up and went for a drive....eeeee (smile) it works
so it looks like I'm rewiring the speakers in my van,,,,booo (no smile)
a friend of mine said it could be because the factory HU has SCV which I think stands for (speed controlled volume). he said there might be a module unit that the speaker wires go to first and adjust the volume going to the speakers, doesn't seem right to me I would think that would be a part of the HU not in the dash. but at least I know my stereo works
thx for the help
ttocs on 04/23/2009 09:49:58
I assume the factory speakers are still in it?
swez on 04/23/2009 13:13:14
It's rare that factory wiring goes bad unless one encounters rodents inside the cabin, under the hood or badly rusted raceways. More often, stock speakers will fail due to age and summer heat.
Make sure your wiring job at the HU is up to snuff and use that known good test speaker to check that audio signals are indeed getting to the factory speakers. If you get music at any or all factory wiring harnesses, the wiring is probably OK.
As for the SCV circuit, that's probably a feature that is built into the Factory HU and has a sensor to monitor vehicle speed. As speed goes up, so does road noise and the radio compensates per the circuit design.
Swez
PS Am glad you tried the dedicated ground idea. Most aftermarket HU's will work on harness grounds. However, some of the more powerful HU amps have trouble with noise issues and the dedicated ground will deminish/eliminate most of that.
but since I installed it, it will work fine while idling in the parking lot but as soon as I drive a couple of feet I loose the audio but the display is still on ,,,,any suggestions to what I can do to fix it SAD
Replies (6)
swez on 04/21/2009 07:12:01
Welcome to CK!
It seems there is a basic wiring problem to correct and perhaps installing a dedicated ground wire to insure the new HU is fully operational. Here is the GM wiring color codes for the stock radio:
http://www.the12volt.com/installbay/stereodetail/454.html
There are 16 wires in all to be checked. The ILL and Dimmer lines can be disconnected for now to simplify your quest.
The easy ones are the 8 speaker lines. Once those are out of the way, the rest is whittled down to the key power and memory functions of the HU.
Did you buy/use a HU conversion harness for this install? These are cheap, easy to find and vehicle specific. Most common HU brands use the same color codes too.
Finally, a dedicated ground wire is very important for Aftermarket HU's. If that is not used, the grounds we rely on are the antenna and the wiring harness. Neither are as reliable as a direct ground to bare metal in the floor pan or firewall. In your case, it seems like the antenna is now the primary ground and as soon as the vehicle is moving, that ground is ineffective.
The other thing to consider is the physical connections for your main wires. Here, barrel type crimp connectors are a good choice for wire joints. (Wrapping bare waire and taping it off, are not good practice as tape tend to go soft in hot weather and gets loose in cold weather)
Comments/Questions?
Swez
ttocs on 04/22/2009 15:04:01
I would check your speaker connections. Pioneers will shut the amp down if any of the speaker wires ground out to keep from blowing an amp. If you replaces speakers recently check behind them.
swez on 04/22/2009 15:52:37
Good to see ya back on CK there ttocs! Was getting kinda slow here the past week while you were away.
How's the job hunt going? (Terrible mess here in MI) Lots of bogus ads and MLM companies scamming those who can least afford to pay to get a look at their scam deals... after one has paid good money to review a lousy deal, they cannot get their $$$ back easily.
Beware!
Swez
soundbuilder on 04/22/2009 20:27:40
hey guys
so this is what I've done
ran a dedicated ground = not fixed,,,,lol I was hoping it would be that easy
ran a dedicated power line from the battery = not fixed
disconnected the rear speakers and went for a very short drive,,,lol nota
with the front speakers disconnected = unsuccessful
finally I went into the basement and dug out a car speaker I have had for years hooked it up and went for a drive....eeeee (smile) it works
so it looks like I'm rewiring the speakers in my van,,,,booo (no smile)
a friend of mine said it could be because the factory HU has SCV which I think stands for (speed controlled volume). he said there might be a module unit that the speaker wires go to first and adjust the volume going to the speakers, doesn't seem right to me I would think that would be a part of the HU not in the dash. but at least I know my stereo works
thx for the help
ttocs on 04/23/2009 09:49:58
I assume the factory speakers are still in it?
swez on 04/23/2009 13:13:14
It's rare that factory wiring goes bad unless one encounters rodents inside the cabin, under the hood or badly rusted raceways. More often, stock speakers will fail due to age and summer heat.
Make sure your wiring job at the HU is up to snuff and use that known good test speaker to check that audio signals are indeed getting to the factory speakers. If you get music at any or all factory wiring harnesses, the wiring is probably OK.
As for the SCV circuit, that's probably a feature that is built into the Factory HU and has a sensor to monitor vehicle speed. As speed goes up, so does road noise and the radio compensates per the circuit design.
Swez
PS Am glad you tried the dedicated ground idea. Most aftermarket HU's will work on harness grounds. However, some of the more powerful HU amps have trouble with noise issues and the dedicated ground will deminish/eliminate most of that.
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