my PCM2.1 not working ( no display, no sound ...)
 

My car is 2003 Cayenne Turbo with PCM2.1
6 months has passed since the audio system failed.
No response, No sound, No display... screen is black T T.
I tried all the way I suggested at this forum, but it was useless.
(for example... press digit 1,4,8, replace fuse, Starting pattern...)
So I decided to disassemble the PCM2.1

first my PCM2.1 on board


https://cimg2.ibsrv.net/gimg/rennlis...4f9527ec9c.jpg


2. separate from the dashboard

https://cimg0.ibsrv.net/gimg/rennlis...5bd3813a8f.jpg

3. check the fuse - OK

https://cimg5.ibsrv.net/gimg/rennlis...be5580e3e3.jpg

4. check cables - OK

https://cimg9.ibsrv.net/gimg/rennlis...f054b500fe.jpg

5. open PCM2.1

https://cimg1.ibsrv.net/gimg/rennlis...e1efd71b19.jpg


6. detail check - i think There was nothing wrong with the sight.hahaha

https://cimg0.ibsrv.net/gimg/rennlis...8b416897d7.jpg

7. assemble PCM2.1 T T

https://cimg3.ibsrv.net/gimg/rennlis...f2cfaaad5d.jpg

finally, I realized that I couldn't fix it myself.

But I wonder what I am asking for now.

There seems to be no physical problem inside the PCM, so may the PCM fail because it doesn't supply power?
How can I check if there is a problem with applying the PCM?
I wish someone would reply to me. please~~
I am so sad to see my dumb Cay these days.

Did you put a volt meter on + pin of the power connector with the connector disconnected You might not be getting power to unit at all. From the post it looks like you only checked the fuse on the back of the pcm.
There should be a main fuse in the fuse box on the vehicle if power is absent at the connector.
Ypu should check continuity across the fuse a visual will work, 99% of the time sometimes the link breaks at the joint of one of the feet.

THX KEVIN~
Thank you for your kind answer.
Not only a fuse at the rear of the pcm, but also the fuses (D8&9) relating to the PCM in the fuze box of the passenger compartment have been replaced.
I think There were no problems with the visually checked fuses.T T

But there is something curious about it.
Your reply 'Did you put a volt meter on + pin of the power connector with the connector disconnected'
I'm sorry, but I honestly didn't understand it.
Excuse me, but I'd appreciate it if you could explain it a little bit.
Thanks once again.

OMZ
 

Finally, I visited an audio repair shop to fix the PCM2.
Experts searched the PCM2 completely, but eventually my audio didn't work.
OMZ
Experts said he would repair my PCM2 for a week, but I was reinstalling and returned to work.

But today, I knew one thing!!!
We found that the power supply from the vehicle to the PCM was not a problem, but that there was a problem with the power supply in the PCM.

OMZ, considering the cost of replacing the Unit, I am devastated.

Well my post was just make sure you were getting power at the connector. You may want to try ebay for a replacement. Sorry for the pcm death!

Many thanks KEVIN
 

Thanks you very much! Kevin
I will find another work to fix my PCM2
I'll find out and I'll talk to you after fixing it!!
Thank you KEVIN

Good luck! Wish you best!