997.2 - what module is under the driver seat?
03-09-2018, 04:25 AM
#1
Racer
Thread Starter
997.2 - what module is under the driver seat?
Busy exploring my new-to-me 2011 997.2 C2S Cab. Although it has a PCM3.0 and Bose, at some point in the past, it had an aftermarket head unit in it and probably a long-gone hidden radar detector.
Was tracing out the leftover wiring from the prior install. Found a cut, purple (not factory) wire in the radio stack that was run down to the module under the drivers seat and spliced into a factory blue wire on that module with a splice tap. Since I don't have a wiring diagram, was wondering what module it is and/or what it might be tapping into? I'd guess reverse for a backup camera, but who knows?
I know the Bose amp module is under the passenger seat.
On the upside, I found two long dead Mophie iPhone chargers, a wireless keyfob to some unknown thing and a $21 under the seats!
Was tracing out the leftover wiring from the prior install. Found a cut, purple (not factory) wire in the radio stack that was run down to the module under the drivers seat and spliced into a factory blue wire on that module with a splice tap. Since I don't have a wiring diagram, was wondering what module it is and/or what it might be tapping into? I'd guess reverse for a backup camera, but who knows?
I know the Bose amp module is under the passenger seat.
On the upside, I found two long dead Mophie iPhone chargers, a wireless keyfob to some unknown thing and a $21 under the seats!
03-09-2018, 01:03 PM
#2
Sounds like your car is already paying you back. Did you buy from an individual, they might have some insight?
03-09-2018, 02:37 PM
#3
Racer
Thread Starter
No, I bought it from a Hyundai dealer down the street from my house. The manuals and books were in the glove box, and I did talk to the local indy shop (RMG in Sunnyvale) who did the last couple of services. They stapled a business card and filled in the maintenance logs, so I stopped by their shop to see if they knew the car. Even had pictures in their computer of the last major service.
But the prior radio install remains a mystery. There's a license plate from reverse camera still installed, and a GPS antenna installed under the windshield cowling (probably a Pioneer, but not sure). Looks like the Bose amp and speakers are unmolested, so it probably had some sort of MOST interface installed.
I'm considering replacing the PCM3.0. While it works fine, just updating the maps alone (parts + labor since it requires dealer to unlock/install) will cost as much as a newer HU. Would gain modern stuff like CarPlay, reverse camera and other newer features. Don't have steering wheel controls, but will lose access to a couple of vehicle settings and the Sports Chrono features.
But the prior radio install remains a mystery. There's a license plate from reverse camera still installed, and a GPS antenna installed under the windshield cowling (probably a Pioneer, but not sure). Looks like the Bose amp and speakers are unmolested, so it probably had some sort of MOST interface installed.
I'm considering replacing the PCM3.0. While it works fine, just updating the maps alone (parts + labor since it requires dealer to unlock/install) will cost as much as a newer HU. Would gain modern stuff like CarPlay, reverse camera and other newer features. Don't have steering wheel controls, but will lose access to a couple of vehicle settings and the Sports Chrono features.
03-09-2018, 03:02 PM
#4
RL Community Team
Rennlist Member
Rennlist Member
No, I bought it from a Hyundai dealer down the street from my house. The manuals and books were in the glove box, and I did talk to the local indy shop (RMG in Sunnyvale) who did the last couple of services. They stapled a business card and filled in the maintenance logs, so I stopped by their shop to see if they knew the car. Even had pictures in their computer of the last major service.
But the prior radio install remains a mystery. There's a license plate from reverse camera still installed, and a GPS antenna installed under the windshield cowling (probably a Pioneer, but not sure). Looks like the Bose amp and speakers are unmolested, so it probably had some sort of MOST interface installed.
I'm considering replacing the PCM3.0. While it works fine, just updating the maps alone (parts + labor since it requires dealer to unlock/install) will cost as much as a newer HU. Would gain modern stuff like CarPlay, reverse camera and other newer features. Don't have steering wheel controls, but will lose access to a couple of vehicle settings and the Sports Chrono features.
But the prior radio install remains a mystery. There's a license plate from reverse camera still installed, and a GPS antenna installed under the windshield cowling (probably a Pioneer, but not sure). Looks like the Bose amp and speakers are unmolested, so it probably had some sort of MOST interface installed.
I'm considering replacing the PCM3.0. While it works fine, just updating the maps alone (parts + labor since it requires dealer to unlock/install) will cost as much as a newer HU. Would gain modern stuff like CarPlay, reverse camera and other newer features. Don't have steering wheel controls, but will lose access to a couple of vehicle settings and the Sports Chrono features.
Peace
Bruce in Philly
03-09-2018, 05:24 PM
#5
Rennlist Member
There is no MOST interface as of a few months ago. I would check your front trunk for holes or evidence where they mounted the new amplifier. Of course, the new head unit may have been the powering unit... but you never know. There are very few amps that will fit in the odd, small space under the passenger seat.
Peace
Bruce in Philly
Peace
Bruce in Philly
Trending Topics
03-09-2018, 06:33 PM
#8
RL Community Team
Rennlist Member
Rennlist Member
I stand corrected.... these must be new because as of not long ago, there was not adapter for the 997.2 Bose Premium. The Porsche Becker linkage between the head unit and amplifier is proprietary and outputs 5.1 processed signals. Our head units play 5.1 DVD-A discs natively. Interesting.
Anyone actually use one?
The most common product for the pre 997.2 PCM3 was MoBridge and of right now, they don't have one for our cars. http://www.mobridge.us/compatibility...46/13148/13348
Peace
Bruce in Philly
Anyone actually use one?
The most common product for the pre 997.2 PCM3 was MoBridge and of right now, they don't have one for our cars. http://www.mobridge.us/compatibility...46/13148/13348
Peace
Bruce in Philly
03-09-2018, 06:41 PM
#9
RL Community Team
Rennlist Member
Rennlist Member
plenty the go the other way too. This is for a aftermarket HU to MOST amp
https://avinusa.com/most-fiber-optic...e-cayenne.html
https://avinusa.com/most-fiber-optic...e-cayenne.html
Peace
Bruce in Philly
03-09-2018, 08:50 PM
#10
Racer
Thread Starter
Nav-TV indicates the MOST-HUR works on the PCM3.0 997 through 2012. The cheaper ones that Seicane and other China ecosystem makers produce seem to be usable in the 997.2 as well as the earlier models. I bought one from eBay that Seicane had on sale. Wanted to experiment with it and see what is inside of it.
None of the interfaces can "fade" front to back. They all take stereo audio input, not 4-channel. I presume the Bose amp doesn't decode front/rear 5.1 format and instead takes an out-of-band signal over the fiber to control the front-rear gain. I'm guessing they do something similar for the center speaker used for nav voice output.
My Bose amp and wiring and speakers are completely unmolested. No taps, nothing. There's some remnants of a prior HU installation, done by a decent shop. There's a USB port in the cubby (that goes to no where), the aftermarket GPS antenna, the reverse camera license plate frame and a few wires left behind. They did a good job of it and re-installed the factory HU when the car changed hands. The wire in question that I started the thread on appears to go to the module that controls the rear lighting.
When I get the MOST hicky, I'll plug it in and see if the Bose amp likes it. Should be easy to test.
None of the interfaces can "fade" front to back. They all take stereo audio input, not 4-channel. I presume the Bose amp doesn't decode front/rear 5.1 format and instead takes an out-of-band signal over the fiber to control the front-rear gain. I'm guessing they do something similar for the center speaker used for nav voice output.
My Bose amp and wiring and speakers are completely unmolested. No taps, nothing. There's some remnants of a prior HU installation, done by a decent shop. There's a USB port in the cubby (that goes to no where), the aftermarket GPS antenna, the reverse camera license plate frame and a few wires left behind. They did a good job of it and re-installed the factory HU when the car changed hands. The wire in question that I started the thread on appears to go to the module that controls the rear lighting.
When I get the MOST hicky, I'll plug it in and see if the Bose amp likes it. Should be easy to test.
03-10-2018, 12:54 AM
#11
Rennlist Member
I stand corrected.... these must be new because as of not long ago, there was not adapter for the 997.2 Bose Premium. The Porsche Becker linkage between the head unit and amplifier is proprietary and outputs 5.1 processed signals. Our head units play 5.1 DVD-A discs natively. Interesting.
Anyone actually use one?
The most common product for the pre 997.2 PCM3 was MoBridge and of right now, they don't have one for our cars. http://www.mobridge.us/compatibility...46/13148/13348
Peace
Bruce in Philly
Anyone actually use one?
The most common product for the pre 997.2 PCM3 was MoBridge and of right now, they don't have one for our cars. http://www.mobridge.us/compatibility...46/13148/13348
Peace
Bruce in Philly
03-10-2018, 03:14 PM
#13
Racer
Thread Starter
I think I'm going to tear down a Bose MOST amp and see what's in it and how to best leverage what's in the car.
One of the hardest things about MOST is that Oasys/Microchip has the OEM market as their bread and butter and there's little available in the way of tools or semiconductors or evaluation boards to play with. Also, since it is a digital transport that can move isochronous packets like audio, as well as asynchronous data packets, like ethernet, there's plenty of opportunity for proprietary data on the optical loop.
Makes it really hard for aftermarket audio to get in. Honestly, the whole car audio aftermarket is pretty much mired in ancient technology for interconnects and interfacing. The more tightly automakers integrate their head units, the more the aftermarket needs to advance. Pretty much though, aftermarket car audio is still about replacing factory 8-track decks and when faced with more advanced stuff, they pretty much can only say, "rip it all out".
Clarion's full digital systems are really interesting and a fresh approach. The idea that the speaker itself is the D/A converter has been around a while, but it has huge advantages.
One of the hardest things about MOST is that Oasys/Microchip has the OEM market as their bread and butter and there's little available in the way of tools or semiconductors or evaluation boards to play with. Also, since it is a digital transport that can move isochronous packets like audio, as well as asynchronous data packets, like ethernet, there's plenty of opportunity for proprietary data on the optical loop.
Makes it really hard for aftermarket audio to get in. Honestly, the whole car audio aftermarket is pretty much mired in ancient technology for interconnects and interfacing. The more tightly automakers integrate their head units, the more the aftermarket needs to advance. Pretty much though, aftermarket car audio is still about replacing factory 8-track decks and when faced with more advanced stuff, they pretty much can only say, "rip it all out".
Clarion's full digital systems are really interesting and a fresh approach. The idea that the speaker itself is the D/A converter has been around a while, but it has huge advantages.
03-10-2018, 04:36 PM
#14
RL Community Team
Rennlist Member
Rennlist Member
I think I'm going to tear down a Bose MOST amp and see what's in it and how to best leverage what's in the car.
One of the hardest things about MOST is that Oasys/Microchip has the OEM market as their bread and butter and there's little available in the way of tools or semiconductors or evaluation boards to play with. Also, since it is a digital transport that can move isochronous packets like audio, as well as asynchronous data packets, like ethernet, there's plenty of opportunity for proprietary data on the optical loop.
Makes it really hard for aftermarket audio to get in. Honestly, the whole car audio aftermarket is pretty much mired in ancient technology for interconnects and interfacing. The more tightly automakers integrate their head units, the more the aftermarket needs to advance. Pretty much though, aftermarket car audio is still about replacing factory 8-track decks and when faced with more advanced stuff, they pretty much can only say, "rip it all out".
Clarion's full digital systems are really interesting and a fresh approach. The idea that the speaker itself is the D/A converter has been around a while, but it has huge advantages.
One of the hardest things about MOST is that Oasys/Microchip has the OEM market as their bread and butter and there's little available in the way of tools or semiconductors or evaluation boards to play with. Also, since it is a digital transport that can move isochronous packets like audio, as well as asynchronous data packets, like ethernet, there's plenty of opportunity for proprietary data on the optical loop.
Makes it really hard for aftermarket audio to get in. Honestly, the whole car audio aftermarket is pretty much mired in ancient technology for interconnects and interfacing. The more tightly automakers integrate their head units, the more the aftermarket needs to advance. Pretty much though, aftermarket car audio is still about replacing factory 8-track decks and when faced with more advanced stuff, they pretty much can only say, "rip it all out".
Clarion's full digital systems are really interesting and a fresh approach. The idea that the speaker itself is the D/A converter has been around a while, but it has huge advantages.
Few think amplifiers are important.... they are about the most important if the other stuff is at least decent. Becker crammed a ton of processing and multi-channel amplification in that tiny thing... well .... my instincts tell me that is the devil in the mess.
Good luck, there have been many many of us over the years who wanted to make this work. This thread is the first I heard in 6-7 years there was a MOST/HUR device to pull the LF/RF LR/RR (or whatever..) channels. Then comes the other issue of sound..... can a tiny digital to analog converter in these things be any good?
BTW, there is another way, to eliminate that amp..... I read on other forums.. that the Becker head unit has a software switch in it that the dealer can flip... it turns the unit from a Bose Premium 5.1 DVDA system to a "base" system. With the flip of the switch, the optical out is turned off, and the dead LF/RF LR/RR pins become active with four channel analog. I thought hard about pulling that trigger but through other issues, my dealer is pretty clueless about these hidden features and I am not sure I want to go there with them.
Peace
Bruce in Philly
03-11-2018, 09:28 AM
#15
Is keeping the head unit driven by the desire to maintain an OEM look? Also would you have the ability to use navigation through the head unit with this set up? I went a different direction and replaced the head unit because I wanted navigation and the after market units have so much more functionality the stock. I know some people prefer to do their navigation through their phones but I really feel the phone is a significant safety hazard while used when driving and that was a major reason for me to get a system that has Apple Car Play. I love the to use Siri for text messages. My Mercedes which is new from last year will read text messages but I cannot send messages which I think is nuts so I have to call people back.