PCM Base Radio - No Sound
#1
02-14-2016, 09:37 PM
PCM Base Radio - No Sound
2011 CS with PCM 3.1 and base radio: for the past few weeks, I'll get no sound out of the speakers after starting the car about half the time. Sometimes there will be a big pop or thud sound out of the speakers and then you get audio the rest of that trip. Sometimes turning the car off, removing the key & back on will restore sound. Sometimes opening and closing the passenger door seems to fix it. I fear this is something like a bad capacitor inside the PCM, but after a bit of research I'm hearing there's a separate amp for the base (non-Bose) PCM radio that can be replaced independent of the PCM unit. Does anyone have any information or experience to share here? I'm holding off on getting my dealer involved until it dies completely, but I did have it in for a separate problem (airbag light due to bad driver door pressure sensor) and they didn't find anything.
#3
02-22-2016, 07:19 PM
Access to Amp
Thanks for the info Serg124. The amp is located above the right rear wheel well, is that correct? Can anyone give me any tips on how to disassemble the trim to access the amp (I searched - it sounds very involved, but found no step-by-step instructions).
Also, how difficult would it be to replace the amp with a 3rd party unit? I suspect the sound would be better than the base system.
Also, how difficult would it be to replace the amp with a 3rd party unit? I suspect the sound would be better than the base system.
#5
03-10-2016, 09:16 PM
Fixed
I eventually lost all sound out of the audio system, but the good news is that I was able to fix it. Here's briefly what I did:
1. Identified the amp for the base + PCM sound system as 95864530202 - lists for about $500
2. Tore apart the right rear interior wheel well trim in the cargo bay to expose the amp.
3. Found a wiring diagram for a Boxster amp made by a company called ASK that matches the Cayenne. Probed the amp inputs and found a faint signal, indicating that the amp was likely the problem.
4. Got really lucky and found this writeup for a 911 that describes the exact same symptoms I was having and explains that the relay is probably the issue: http://www.pistonheads.com/gassing/topic.asp?t=1234814
5. Ordered V23086-C1001-A403 relay from eBay and swapped it out
Total time: one month. Total cost: $10 ($7 for the relay and $3 for the two plastic rivets I destroyed while taking the trim panel off)
Hope this helps someone, and good luck!
1. Identified the amp for the base + PCM sound system as 95864530202 - lists for about $500
2. Tore apart the right rear interior wheel well trim in the cargo bay to expose the amp.
3. Found a wiring diagram for a Boxster amp made by a company called ASK that matches the Cayenne. Probed the amp inputs and found a faint signal, indicating that the amp was likely the problem.
4. Got really lucky and found this writeup for a 911 that describes the exact same symptoms I was having and explains that the relay is probably the issue: http://www.pistonheads.com/gassing/topic.asp?t=1234814
5. Ordered V23086-C1001-A403 relay from eBay and swapped it out
Total time: one month. Total cost: $10 ($7 for the relay and $3 for the two plastic rivets I destroyed while taking the trim panel off)
Hope this helps someone, and good luck!
#7
04-04-2016, 12:51 PM
My 2012 Cayenne doesn't have any sound coming from some of the stock front speakers (base system, not Bose). Rear and door bottom speakers are fine, all other fronts (dashboard, center, door top) are out. Verified with balance/fade controls, and reset PCM.
Thinking I need to check the amp to see if some channels are out.
wthayer - your summary info posted is great - thank you. Any additional info/pictures for removing the trunk panels for getting to the amp?
Keith
Thinking I need to check the amp to see if some channels are out.
wthayer - your summary info posted is great - thank you. Any additional info/pictures for removing the trunk panels for getting to the amp?
Keith
Last edited by kredmore; 04-07-2016 at 05:58 PM.
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#8
04-06-2016, 09:48 PM
I should've taken pics of the panel removal, but I didn't.
You want to start with the upper D trim panel - peel back the liftgate seal and pull the trim piece out - it should pop out. On mine there was a little strap that held this trim piece up in the air after I pulled it off - I have no idea why. Then the upper C trim panel at the back of the rear door - the seat belt threads through this. Again, it should just pop out but takes some force. Then remove the passenger side cargo tie down bar on the floor of the cargo area - just take out two torx head bolts under the ties downs and lift it up. You also need to pop out the ribbed chrome trim panel that covers the bottom of the hatch opening - covering the liftgate latch. I didn't take this part out and ended up breaking a little alignment tab on the big wheel well trim piece. I think this piece just pops out but since I didn't remove it, can't say for sure. Finally, there are two big rivets that hold in the wheel well cover - one toward the front and one toward the back. I ended up destroying these to get them out (found new ones at VW dealer for under $2 each). Once these rivets are out, the wheel well cover should come out.
Hope this helps.
You want to start with the upper D trim panel - peel back the liftgate seal and pull the trim piece out - it should pop out. On mine there was a little strap that held this trim piece up in the air after I pulled it off - I have no idea why. Then the upper C trim panel at the back of the rear door - the seat belt threads through this. Again, it should just pop out but takes some force. Then remove the passenger side cargo tie down bar on the floor of the cargo area - just take out two torx head bolts under the ties downs and lift it up. You also need to pop out the ribbed chrome trim panel that covers the bottom of the hatch opening - covering the liftgate latch. I didn't take this part out and ended up breaking a little alignment tab on the big wheel well trim piece. I think this piece just pops out but since I didn't remove it, can't say for sure. Finally, there are two big rivets that hold in the wheel well cover - one toward the front and one toward the back. I ended up destroying these to get them out (found new ones at VW dealer for under $2 each). Once these rivets are out, the wheel well cover should come out.
Hope this helps.
#9
04-07-2016, 05:57 PM
I should've taken pics of the panel removal, but I didn't.
You want to start with the upper D trim panel - peel back the liftgate seal and pull the trim piece out - it should pop out. On mine there was a little strap that held this trim piece up in the air after I pulled it off - I have no idea why. Then the upper C trim panel at the back of the rear door - the seat belt threads through this. Again, it should just pop out but takes some force. Then remove the passenger side cargo tie down bar on the floor of the cargo area - just take out two torx head bolts under the ties downs and lift it up. You also need to pop out the ribbed chrome trim panel that covers the bottom of the hatch opening - covering the liftgate latch. I didn't take this part out and ended up breaking a little alignment tab on the big wheel well trim piece. I think this piece just pops out but since I didn't remove it, can't say for sure. Finally, there are two big rivets that hold in the wheel well cover - one toward the front and one toward the back. I ended up destroying these to get them out (found new ones at VW dealer for under $2 each). Once these rivets are out, the wheel well cover should come out.
Hope this helps.
You want to start with the upper D trim panel - peel back the liftgate seal and pull the trim piece out - it should pop out. On mine there was a little strap that held this trim piece up in the air after I pulled it off - I have no idea why. Then the upper C trim panel at the back of the rear door - the seat belt threads through this. Again, it should just pop out but takes some force. Then remove the passenger side cargo tie down bar on the floor of the cargo area - just take out two torx head bolts under the ties downs and lift it up. You also need to pop out the ribbed chrome trim panel that covers the bottom of the hatch opening - covering the liftgate latch. I didn't take this part out and ended up breaking a little alignment tab on the big wheel well trim piece. I think this piece just pops out but since I didn't remove it, can't say for sure. Finally, there are two big rivets that hold in the wheel well cover - one toward the front and one toward the back. I ended up destroying these to get them out (found new ones at VW dealer for under $2 each). Once these rivets are out, the wheel well cover should come out.
Hope this helps.
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