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Hi,
There are a number of issues related to the CDR23 in the '03 models. There are several TSBs regarding inoperative sound. Some are the result of a PST2 Tester with the wrong software version (14.0) being used on the Car and several relate to cars with the PSM option. Clearing Fault Codes using the 14.0 software can render the CDR23 and Amplifier's sound inoperative.
Porsche first suggests getting out of the car, locking the Car with the hand-held transmitter, wait until the Alarm LED flashes and then unlock the car and turn on the CDR23.
Also, the coding for the CDR23 and Amplifier must be correct. This too is set with the PST2 Tester. On the Tester, you need to select Control Units, next select PCM2/CDR23, next select CDR23, then select Coding, check to see that the coding for Type, Variant and Left/Right-Hand Drive are correct. Next select Amplifier, select Coding, and again be sure that the Type, Variant and Left/Right-Hand Drive match the vehicle code. You select [F8] to change the selection. Finally, you must disconnect the battery. Hope this helps...
Happy Motoring!... Jim'99
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