No Sound from Becker Grand prix 7990?

[krestian]

Hi All

Just installed the Becker grand prix 7990 in my 2000 Boxster S, but it will not say anything?

The original unit in my car is the Becker CDR-22 with CD changer and amplifier.

The reason is changed radio was to get an iPod control and the reason I chose the Becker was a) it looks similar to the original and b) it SHOULD be inter-changable as all the socket are identical.

so should be easy.

when I connect the 7990 everything seems to work, iPod, every thing. Just NO sound? The remote voltage for the amplifier on/off( pin 5 on socket A) also seems to work on=13V off=0V

when I reconnect the CDR-22 I get sound again.

It is almost as the amplifier line outputs on the 7990 are muted?

Am I going crazy?

Sincerely
Krestian

 

[Richard_Hamilton]

Socket A Pin 5 is the switched supply +ve for the aerial amplifier. Looks like yellow plug C pin 6 should have the 12v+ for the amplifier. If you would like a copy of the wiring diagram email me at richard996 at gmail d0t c0m

 

[krestian]

Hi Richard

Thanks. I will email to get the wiring diagram.
however, pin 5 is the connector that turns on/off amplifier+ automatic antennas etc.

the yellow plug is only the amplifier Audio outputs.

The thing is that the original radio (CDR-22) is a becker so I have not touched the wiring harness as they should be interchangable??

I dont get it!

Maybe the new radio is faulty?

 

[Richard_Hamilton]

There should be a positive feed in there too:

 

[Richard_Hamilton]

ORIGINAL: krestian
Thanks. I will email to get the wiring diagram.

Krestian - I didn't receive your email. If you used the forum mail system, try emailing me direct, as I don't think it is working properly - I keep getting rejection messages whenever I try using it.

 

[davej_anderson]

Have a look here:

http://www.renntech.org/forums/index.php?showtopic=601&hl=traffic+pro

Sounds like the same issue and should be easy to fix.

 

[krestian]

Thanks guys

It is working now.

It was indeed pin 6 on connector C1 that had to be connected to pin 5 on connector A.

What confused me was that in the CDR-22 manual the pin 6 on C1 is described as "not assigned" and since pin 6 on the new radio is subwoofer output( combined with the description of pin 5 socket A, for amp on/off) i accepted the "not assigned" description.

Anyway, it is up and runnning now

thanks again

sincerely

Krestian