3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBose MOST issues
Leading reported evidence
Use piwis
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
They have to be coded to your car by the dealership using a PIWIS.
Leading evidence: 'Use piwis' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace amplifier' (1 discussions). For that action, 0 discussions report a resolution and 1 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report an unsuccessful attempt
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Unsuccessful attempt · Original poster
I replaced the amplifier with a known working unit and also bypassed the cd changer with no change.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T052503Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently bought a 2004 996 Turbo with a PCM 2.0 unit. Unfortunately, there is no sound through the dreaded Bose MOST system. The E6/E6/Radio fuses are all fine. I looked at the stock amplifier and I noticed a little corrosion on the big rectangular male connector. I replaced the amplifier with a known working unit and also bypassed the cd changer with no change.
There is a faint static sound through the speakers. The PCM 2.0 unit functions fine even though the system has no sound. When the PCM unit has power, you can see a red laser emitting from the MOST plug when it is removed. I can also see a red laser coming out of the amplifier and CD changer MOST plugs when they are individually removed and the fiber link is broken. I cannot connect to any PCM modules that populate in my PIWIS III. The PCM unit will flash a service message for a few seconds and then it gives a communication timeout code. It could be my PIWIS – although I can connect to other modules without an issue. Before I bypassed the cd changer, it would tell me that the changer was unavailable when I selected the button. The CD changer itself does not have a magazine in it so I did not know if that is a normal message to display if there is nothing for the changer to read. It also tells me that the navigation is unavailable when I select the button as well. I am not sure if I have to insert the disc for it to work.
Any ideas on what the issue could be? I am leaning towards trying another PCM 2.0 radio. Maybe I can grab one at the Hershey swap meet. In the meantime, does anyone know how the MOST link is daisy chained? Does it go Radio -> Amp -> CD Changer -> Radio? Looking at a picture of an ebay PCM 2.0 navigation module, it does not look like it has a MOST connection based off the plugs on the back of the unit. I do not think my car has a telephone module, as there is nothing under the passenger side seat. Am I missing anything?
I'd try a new amp before swapping out the head unit. Since the amps are located in the frunk, they are known to go bad. Plus, you can't just swap out a PCM MOST based unit on these cars. Sorry, not plug and play. They have to be coded to your car by the dealership using a PIWIS.
