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From: jeff in Atl on 18 Feb 2007 17:16



I recently installed a Jensen VM9510 that I got second hand. I had to
order the head unit's wiring harness from Audiovox/Jensen, and I
paired it to an aftermarket harness adapter that fits my car (I've had
experience with this sort of install).

Anyway, when I hooked everything up, it all worked perfectly, except
that there is no sound to the rear speakers. I checked the balance and
fade, and the various speaker configurations (this is also a DVD unit
with a flip out display panel). I also checked the harness adapter I
bought against my car's wiring diagram, and that matched up ok.
Finally, I used a multimeter to look for DC voltage on the speaker
wires. The rear speaker wires show a tiny bit of power that does not
fluctuate. The front speaker pairs show a bit more power that does
fluctuate with the music (it is a digital multimeter, so it doesn't do
changing voltages very well).

Is there a better way to use a multimeter on this? Any idea on why the
head unit doesn't seem to be sending anything to the rear speakers? Is
there a work around (e.g. using the RCA outs to run the rear
speakers)?

Information:
Jensen VM9510 CD/DVD/MP3 player with 1.7" flip out sceen
1998 Suburaban (previously a factory Delco system, no OnStar, no Bose)
Factory speaker wiring and speakers

Any help greatly appreciated. Thanks.

Jeff
From: e-nigma on 19 Feb 2007 10:37

"jeff in Atl" <jeffgodfrey(a)nospam.hotmail.com> wrote in message
news:dkjht2hgqkegcrc8ghm3ou0skan6ilql7j(a)4ax.com...
>
>
>
> I recently installed a Jensen VM9510 that I got second hand. I had to
> order the head unit's wiring harness from Audiovox/Jensen, and I
> paired it to an aftermarket harness adapter that fits my car (I've had
> experience with this sort of install).
>
> Anyway, when I hooked everything up, it all worked perfectly, except
> that there is no sound to the rear speakers. I checked the balance and
> fade, and the various speaker configurations (this is also a DVD unit
> with a flip out display panel). I also checked the harness adapter I
> bought against my car's wiring diagram, and that matched up ok.
> Finally, I used a multimeter to look for DC voltage on the speaker
> wires. The rear speaker wires show a tiny bit of power that does not
> fluctuate. The front speaker pairs show a bit more power that does
> fluctuate with the music (it is a digital multimeter, so it doesn't do
> changing voltages very well).
>
> Is there a better way to use a multimeter on this? Any idea on why the
> head unit doesn't seem to be sending anything to the rear speakers? Is
> there a work around (e.g. using the RCA outs to run the rear
> speakers)?
>
> Information:
> Jensen VM9510 CD/DVD/MP3 player with 1.7" flip out sceen
> 1998 Suburaban (previously a factory Delco system, no OnStar, no Bose)
> Factory speaker wiring and speakers
>
> Any help greatly appreciated. Thanks.
>
> Jeff

You need to set the voltage to the AC setting not DC.
Best way to test it is use a test speaker, or a small home speaker and check
the speaker lines right from of the main unit
It is unlikely that the unit has bad outputs. problem could be is the unit
settings or vehicle may have a factory amp on the rear channels.
If vehicle has an factory amp, it is usually under the driver seat.
If for some reason the unit does not have any output right from the unit,
you can add an external amp the rear RCA outputs. The Grey RCA's on the main
harness is for a rear external amp and the black pair is for front amp


From: jeff in Atl on 22 Feb 2007 20:53
On Mon, 19 Feb 2007 10:37:11 -0500, "e-nigma" <kalelmail(a)yahoo.com>
wrote:

>
>"jeff in Atl" <jeffgodfrey(a)nospam.hotmail.com> wrote in message
>news:dkjht2hgqkegcrc8ghm3ou0skan6ilql7j(a)4ax.com...
>>
>>
>>
>> I recently installed a Jensen VM9510 that I got second hand. I had to
>> order the head unit's wiring harness from Audiovox/Jensen, and I
>> paired it to an aftermarket harness adapter that fits my car (I've had
>> experience with this sort of install).
>>
>> Anyway, when I hooked everything up, it all worked perfectly, except
>> that there is no sound to the rear speakers. I checked the balance and
>> fade, and the various speaker configurations (this is also a DVD unit
>> with a flip out display panel). I also checked the harness adapter I
>> bought against my car's wiring diagram, and that matched up ok.
>> Finally, I used a multimeter to look for DC voltage on the speaker
>> wires. The rear speaker wires show a tiny bit of power that does not
>> fluctuate. The front speaker pairs show a bit more power that does
>> fluctuate with the music (it is a digital multimeter, so it doesn't do
>> changing voltages very well).
>>
>> Is there a better way to use a multimeter on this? Any idea on why the
>> head unit doesn't seem to be sending anything to the rear speakers? Is
>> there a work around (e.g. using the RCA outs to run the rear
>> speakers)?
>>
>> Information:
>> Jensen VM9510 CD/DVD/MP3 player with 1.7" flip out sceen
>> 1998 Suburaban (previously a factory Delco system, no OnStar, no Bose)
>> Factory speaker wiring and speakers
>>
>> Any help greatly appreciated. Thanks.
>>
>> Jeff
>
>You need to set the voltage to the AC setting not DC.
>Best way to test it is use a test speaker, or a small home speaker and check
>the speaker lines right from of the main unit
>It is unlikely that the unit has bad outputs. problem could be is the unit
>settings or vehicle may have a factory amp on the rear channels.
>If vehicle has an factory amp, it is usually under the driver seat.
>If for some reason the unit does not have any output right from the unit,
>you can add an external amp the rear RCA outputs. The Grey RCA's on the main
>harness is for a rear external amp and the black pair is for front amp
>


Thanks for the great suggestions!

I swapped the front speakers and rear speaker wires in the harness,
and suddenly got sound from the rear speakers, but not the front. So,
I don't think that there is an amp in the truck. There is, however,
two wires in the wiring harness (green and green stripe) that don't
have mates on the wiring adapter I bought.

Anyway, after determining that there just doesn't seem to be signal
coming from the rear speaker wires, I used an adapter to listen to the
RCA pre-outs with a headset. The front RCA's were fine, but the rear
ones, I couldn't hear much w/o turning the volume up, and then all I
got was some low volume staticy music in one ear.

Is this a bad head unit? I can't escape the feeling that some setting
in there has disabled the rear sound for some dual-zone DVD viewing
purpose, but I have been through every setting and the manual many
times.

Any other suggestions are great appreciated.

Jeff
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