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I recently purchased a used 99 C2 Cab with the OEM PCM1 navigation unit installed. Unfortunately, the screen is cracked and the unit doesn't work. I've procured a replacement unit and am wondering how to swap out the new unit for the old. For example, do the "keys" that one normally uses to take the radio out work for the nav unit, too? Or, should I just take everything to my local dealer and have them do the the work?

Any help and advice greatly appreciated.

While I'm at it, my driver's side window doesn't go down quite all the way. Is this a "memory" problem, or something that also needs a dealer's attention.



Porsche 356 Super 90 (sold)

Porsche C2 Cab

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You don't need the becker removal keys for the PCM1. Just pop off the side covers using a butter knife at the bottom of each side piece. It feels like you'll break something, but keep twisting the knife and it will pop off. If you have leather, be careful not to damage it. Then remove the torx screws (I think they are T20, but I'm not positive). Grab the unit at the sides and slide it out. It's heavy and a bit awkward, so don't let it tip forward and smash into the shifter. Oh, yeah, it's already broken. I'd put a towel over the shifter before installing the new one, just in case. You'll need to disconnect several connectors and the aentenna at the back. Note also that there is a clip underneeth the PCM unit that is connected to the alarm. When you install the new unit, you'll need to attach the alarm connection so that it touches only the insulated part of the unit, otherwise you'll get an alarm error. If the plastic is not on the new unit, you can just put a piece of tape in its place to keep it from completing the circuit. You might also have to pop out the switches on the sides of the PCM and pop 'em in the new one. Just when you think you'll break 'em, they'll pop out.

I think you might need the dealer to program the PCM to match your car, but I'm not sure. I don't know if that would keep your car from starting, but if it did, I suppose you could put the old one back in.

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