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CDR23 switched 12V?


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I'm still very happy with the addition of a JVC headunit to my Boxster using an FM modulator and the CDR23 as the amp. However, my only complaint is that the Boxster radio stays on for a few seconds after ignition off, but the cell phone power I tapped under the batwing to power the FM modulator turns off as soon as the key comes out - so for a few seconds, the CDR23 plays whatever is coming in on FM at whatever volume it's set to. :(

Does anyone know if there's +12v wire in the harness for the CDR23 that's used to switch the amp in the frunk - or another +12v accessory wire coming from the CDR23 that is hot as long as the CDR23 is active? I'd like to tap that for the RF modulator so the modulator is powered whenever the CDR23 is on.

Thanks in advance!

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...the cell phone power I tapped under the batwing to power the FM modulator turns off as soon as the key comes out...

Does this mean the FM modulator stay on right until you remove the key? Or does it turn off as soon as you turn the key to "off"?

I'm really curious about this because I have been looking for ages for a power source that stays on right until the key is removed.

My cigarette lighter has switched IGN positive, but it goes off as soon as I turn the key off IGN - but yes the radio stays on right until

I remove the key.

Does anyone know if there's +12v wire in the harness for the CDR23 that's used to switch the amp in the trunk - or another +12v accessory wire coming from the CDR23 that is hot as long as the CDR23 is active? I'd like to tap that for the RF modulator so the modulator is powered whenever the CDR23 is on.

According to a diagram in another thread, Pin 5 on the black connector is remote 12V out for amplifier/powered antenna - see here http://www.renntech.org/forums/index.php?showtopic=25868

Though I would check this with a multimeter first! Bob's Ultima site says messing with that cable caused his HVAC to have problems:

http://www.ultima-gtr.org.uk/becker.php

Let us know how it goes!

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Porsche radios in 9x6 and 9x7 series cars are all unswitched power - that is, there are always on.

This is correct. However when the Porsche radio (eg CDR-23) is on, it's Pin A5 provides

+12V to the antenna/amplifier, which could be used as "radio switched" power for an

FM modulator.... correct?

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  • Admin
Porsche radios in 9x6 and 9x7 series cars are all unswitched power - that is, there are always on.

This is correct. However when the Porsche radio (eg CDR-23) is on, it's Pin A5 provides

+12V to the antenna/amplifier, which could be used as "radio switched" power for an

FM modulator.... correct?

Theoretically yes. I do not know how power you can draw from the A5 connection as it is intended for the antenna only.

If this is a US car why not just use the telephone prep power - there is both switch and unswitched 12 volts there.

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the cell phone power I tapped under the batwing to power the FM modulator turns off as soon as the key comes out - so for a few seconds, the CDR23 plays whatever is coming in on FM at whatever volume it's set to. :(

The original poster is already using the cellphone adapter, but is looking for a way to get rid of this 5-second-delay ( caused by the original porsche radio using the CAN bus data to turn off rather than the analog IGN line)

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If this works, I will be 100% happy with my setup.

Let us know it goes. Alternatively, you could make a simple "switch off delay" circuit for your FM mixer device...... I don't know enough about electronics to help, but you'd just need some radioshack parts... transistors and capacitors.... have a look at these schematics if they make sense to you (the text is in german, AUS means OFF):

http://www.bayer-soft.de/elektro/verzoeg2/verzoeg2.htm

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  • 11 years later...
On 4/6/2009 at 12:11 PM, yellowlemon said:

This is correct. However when the Porsche radio (eg CDR-23) is on, it's Pin A5 provides

+12V to the antenna/amplifier, which could be used as "radio switched" power for an

FM modulator.... correct?

Hmmmm. On my 03 Boxster, A5 is constant 12V. I guess the antenna amp doesn’t use much power:-)

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