PCM1 (8bit) Codes

[Richard Hamilton]

A friend of mine has bought a 1999 C4 Coupe (RoW LHD). It's a long story, but the car had been sitting unused for over 5 years, and of course the battery had gone totally flat, and the PCM codes have been lost.

I know very little about PCM, but before taking an (expensive) trip to the dealer:

Is there just one security code?

Is there a way of retreiving the serial number(s) without removing the units?

Is the system made by Becker, and if so will the "junk" decoder I have work?

Any info would be greatly appreciated.

[Richard Hamilton]

No info anyone?

[Loren]

Richard - did you look in the DME Vehicle Data?

Sometimes they put the code in there so you can look it up.

[Richard Hamilton]

I haven't been able to check this myself, because my friend is a long way from me, and I'm not back in the driving seat yet. The car had some work done by a specialist workshop in Germany to get the car running, and they got the radio working but not the satnav. Apparently, there was a 5 digit code stored in the DME, which they gave my friend, but that sounds highly suspect to me.

My understanding now is that there are two codes - one for radio and one for satnav. I guess the next step is to take out the nav unit and try the junk decoder with the serial number. I was hoping that he may be able to get the serial number by pressing a button, as can be done with some of the Becker radios. I assume it is made by Becker, but have a nagging doubt that it might be a Siemens unit, although I have no memory of where that thought came from.