BMW Luxury Touring Community banner

1 - 12 of 12 Posts

·
Registered
Joined
·
364 Posts
Discussion Starter #1
Hi All! I've read everything in the HoW and my service manual CD on point, and my question persists.

I'm trying to run the audio signal from the rear speakers into my autocom, and I need to know which wires in the center coupler are which. By opening the speakers, I've figured this much out:

LEFT....................Yellow......................Yellow/Blue....................

RIGHT...................Blue/Grey................Blue/Purple
....................

Now, I just need to know if one is NEG and one POS, and if so, which is which?

I turned on the radio and put the voltmeter on each of the four wires separately, and EACH shows 7 volts. I was expecting to find one wire per side that had no voltage, and figured that would be the negative wire. But they both have a voltage, and I don't know why.

I'm doing something of a non-traditional autocom install. Since I frequently ride alone, I wanted the ability to turn off the autocom unit. So, I installed a SPST switch in the topcase aside the rear seat to cut power to the unit. I ALSO ran a DPDT relay in parallel off that switch. The relay will switch the positive audio signal wires from the bike radio between the rear speakers and the autocom unit. That way, when I turn off the autocom, the rear speakers work as normal, and when I turn on the autocom, the relay activates, cutting the signal from the rear speakers and sending it to the autocom instead. (If this paragraph is confusing, it is ancillary to my main question above and can be discarded en masse.)

All is installed and working well. The relay is wired and activates as planned, and the leads are all set to be soldered into the wiring harness. I just need to know what the above-mentioned colored wires are doing.

Thanks!
 

·
IBR# 366
Joined
·
16,533 Posts
Check Jim Beard's K1200LT Autocom Install page. Look for the link to 1200 LT SML-S-CRA Wiring for the info you need.

The SML-S_CRA is a wiring lead sold by Autocom that does exactly what you want, though it sounds like you've already got the bulk of the work sorted out.

Basically, the Yellow/Blue and Blue/Grey wires are positive, and the Yellow and Blue/Purple are negative.

And the reason you're seeing voltage on all leads is that these are speakers, not light bulbs. Speakers are just coils, which take a continuously variable voltage signal, not just 12 Vdc and Ground.
 

·
Registered
Joined
·
364 Posts
Discussion Starter #3
Thanks for the info. I read Jim Beard's great autocom install page in the HoW a few times before beginning the project, but he doesn't show the pos/neg pinouts - only which colors go with each other. Now that I have that info, I can finish the project. Thanks again!
 

·
IBR# 366
Joined
·
16,533 Posts
It's true he doesn't label them as + and - but it's the left + and right + wires that get cut in his diagram. Glad it helped.
 

·
Registered
Joined
·
29 Posts
meese said:
Check Jim Beard's K1200LT Autocom Install page. Look for the link to 1200 LT SML-S-CRA Wiring for the info you need.

The SML-S_CRA is a wiring lead sold by Autocom that does exactly what you want, though it sounds like you've already got the bulk of the work sorted out.

Basically, the Yellow/Blue and Blue/Grey wires are positive, and the Yellow and Blue/Purple are negative.

And the reason you're seeing voltage on all leads is that these are speakers, not light bulbs. Speakers are just coils, which take a continuously variable voltage signal, not just 12 Vdc and Ground.
I have looked at Jim Beard's instruction set regarding hooking up rear speakers to headphones on an Autocomm and many other threads about the subject. My question is: Will Jim Beard's instructions work on my K1200LT 2000 model?

A few of the threads mentioned 2005 and 2006 models and a couple of people with 2009 models had some questions about it. But will Mr. Beards instructions work on a 2000 model?

Thank you in advance
Jonny Oliver
2000 K1200 LT
1993 K1100 LT
 

·
Registered
Joined
·
14,452 Posts
joliver said:
I have looked at Jim Beard's instruction set regarding hooking up rear speakers to headphones on an Autocomm and many other threads about the subject. My question is: Will Jim Beard's instructions work on my K1200LT 2000 model?

A few of the threads mentioned 2005 and 2006 models and a couple of people with 2009 models had some questions about it. But will Mr. Beards instructions work on a 2000 model?

Thank you in advance
Jonny Oliver
2000 K1200 LT
1993 K1100 LT
Been a long time since I've worked on an Autocomm installation, butt yes, Beard's instructions should work for a 2000 LT.
 

·
Premium Member
Joined
·
4,874 Posts
joliver said:
I have looked at Jim Beard's instruction set regarding hooking up rear speakers to headphones on an Autocomm and many other threads about the subject. My question is: Will Jim Beard's instructions work on my K1200LT 2000 model?

A few of the threads mentioned 2005 and 2006 models and a couple of people with 2009 models had some questions about it. But will Mr. Beards instructions work on a 2000 model?
I used those instructions on my 2002 several years ago and they worked beautifully. Not one problem in 8 years with the Autocom. Only problem with the AutoCom "system" was the big black wire connecting it to my helmet. Bluetooth solved that problem in the new bike.
 

·
Registered
Joined
·
223 Posts
Just be careful to make the splices on the proper side of the main plug going to the trunk and speakers. DAMHIK.

Larry Johnson
 

·
Registered
Joined
·
29 Posts
Thanks Dick and Dan Diver for your replies. Larry, I havn't looked at the diagrams for a couple of weeks, but will the diagrams tell me which side to cut into? I would guess the proper side is after the main plug on the way to the speakers.

From an electrically challenged rider! (As if you couldn't tell!)

ljjohns said:
Just be careful to make the splices on the proper side of the main plug going to the trunk and speakers. DAMHIK.

Larry Johnson
 

·
Registered
Joined
·
223 Posts
You're not as challenged as I am. Yes, it should be on the side going to the trunk and speakers, the end with the blue arrow.

For reasons known only to God, I made the connections on the other side.I should have had a clue when I had to reverse the color connections, but I forged on. Now I can't remove the trunk fully because the Autcom wiring is fixed to the end of the connector coming from the front of the bike.

Larry Johnson
 

·
Registered
Joined
·
29 Posts
ljjohns said:
You're not as challenged as I am. Yes, it should be on the side going to the trunk and speakers, the end with the blue arrow.

For reasons known only to God, I made the connections on the other side.I should have had a clue when I had to reverse the color connections, but I forged on. Now I can't remove the trunk fully because the Autcom wiring is fixed to the end of the connector coming from the front of the bike.

Larry Johnson
This is the best site of advisors that I have ever experienced or ever heard of. Thank each of you for keeping me straight. I hope that someday I can help out too.

Jonny Oliver
Concord, NC
 

·
Registered
Joined
·
270 Posts
meese said:
Check Jim Beard's K1200LT Autocom Install page. Look for the link to 1200 LT SML-S-CRA Wiring for the info you need.

The SML-S_CRA is a wiring lead sold by Autocom that does exactly what you want, though it sounds like you've already got the bulk of the work sorted out.

Basically, the Yellow/Blue and Blue/Grey wires are positive, and the Yellow and Blue/Purple are negative.

And the reason you're seeing voltage on all leads is that these are speakers, not light bulbs. Speakers are just coils, which take a continuously variable voltage signal, not just 12 Vdc and Ground.

Save yourself some grief, autocom makes a lead with instructions which will save you a lot of time and it will work properly after you are finished. This leads requires a ground loop isolator, without it the radio will just howl in you headset. Kieth call me for more info. 918-446-2245
 
1 - 12 of 12 Posts
Top