pfbz

2004 911 C2, base stereo, which I am upgrading to a Blaupunkt Toronto 420BT.

Question about the windshield antenna amp...

How the antenna amp is powered in the stock configuration? Is it powered from the CDR-23, like a traditional (motorized up/down) power antenna? The standard DIN plug A pin 5? Or is it powered directly and independently of the radio from another switched circuit?

Ssome other connections on DIN plug A of the CDR-23 are a bit non-standard, and before I start feeding 12V+ from the radio into the wiring harness, I wanted to double check.

I've ordered the Bentley 996 service manual, but it hasn't arrived yet. Hopefully it will have 2003/2004 wiring diagrams.

Thanks in advance for any help. This web site is a great resource!

The codes are not transmitted by the MOST bus. They are transmitted by the diagnosis line. This is a white/red wire connected to the green plug on the CDR.

Thanks... That makes sense. And presumably if the diagnosis line is not connected, it goes into lock mode.

Loren,

Thanks for moving my post to the correct place.

I understand your description of how the CDR-23 programming works, and it makes perfect sense for units that are connected to the MOST bus, as I assume most CDR-23's are.

But if the head unit is not connected to the MOST bus (my factory config), I don't get how it could either be programmed by a dealer or detect the s/n of the vehicle it is installed in...

CDR-23 (or later):

These radios do not have a security code - that is, not that the user enters.

These radios are security tested on the MOST (fiber optic bus) system to see if they are the "programmed" radio. The radios are programmed and recognized by the car’s DME and can only be replaced by a shop with a PST2 or PIWIS. These radios will not request a code when battery power is disconnected.

Not sure if this is the right place for this question, but I'll give it a try.

I have a 2003 996 with a CDR-23. It is the base stereo system, no amp, no upgrades.

The fiber port on the CDR-23 has nothing connected to it, just a dummy plug in the hole, so obviously in this case the radio isn't communicating with anything over the optical bus, and works fine after power is disconnected.

• Does this mean that this particular CDR-23 has no security programming requrement?
  
• Will all CDR-23's work without a car specific programming as long as it is in stand-alone mode not communicating with anything else on the MOST bus?
  
• If this radio was used to replace a CDR-23 on another vehicle that did have a bose amp / MOST bus, would this head unit, which works fine in stand-alone mode,then need dealer reprogramming to work once connected to another vehicles MOST bus?
  

Thanks in advance for any info on this.