Stereo/Electrical Hacking Help - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Insert BS here A place to discuss anything you want

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-15-2010, 01:07 AM   #1
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default Stereo/Electrical Hacking Help

So I'd like to hook up an auxiliary input to my stock 95 Honda Accord head unit, via the MBUS connector (used for an add-on Alpine 6 disk cd changer) on the back of the head unit.

The problem is emulating a cd player, so it can go into AUX mode.

Since my add-on Alpine changer won't read disks any more (head unit still works fine), can I just splice into the R/L channel lines of the MBUS cable and connect to my IPOD? I'm assuming it will still go into AUX mode since the changer is still present.

MBUS pin out:

kenzo42 is offline   Reply With Quote
Old 03-15-2010, 01:10 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,315
Total Cats: 1,913
Default

Probably.

I'd cut the L and R wires, and tap the SIG GND line.
Joe Perez is offline   Reply With Quote
Old 03-16-2010, 02:22 AM   #3
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

Quote:
Originally Posted by Joe Perez View Post
Probably.

I'd cut the L and R wires, and tap the SIG GND line.
What do you tap the SIG GND to? I'm assuming another ground, but from where?
kenzo42 is offline   Reply With Quote
Old 03-16-2010, 02:25 AM   #4
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

I did something similar using the IPBUS input on a Pioneer head unit I had. Run the ground to the ground that will be coming out of the Ipod. If the volume is too low, even with the Ipod turned all the way up, get a battery-powered headphone amplifier from the shack. I had to do that.
Bryce is offline   Reply With Quote
Old 03-16-2010, 02:32 AM   #5
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

This is going to sound stupid, but where is the ground that comes out of the Ipod? I'm using a Y cable (2 RCA plugs to a mini jack) cable. I'm assuming there's a ground, but where is it on the Y cable?
kenzo42 is offline   Reply With Quote
Old 03-16-2010, 02:38 AM   #6
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

I believe the ground would be common between the 2 RCA jacks. It would be the outer "ring" on them.
On mine, I just cut the end off a 1/8th to 1/8th cable, it had 3 wires coming out of it. IIRC, ground would have continuity with postion 1 on those plugs in the picture.
Bryce is offline   Reply With Quote
Old 03-16-2010, 03:08 AM   #7
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,315
Total Cats: 1,913
Default

Quote:
Originally Posted by kenzo42 View Post
This is going to sound stupid, but where is the ground that comes out of the Ipod? I'm using a Y cable (2 RCA plugs to a mini jack) cable. I'm assuming there's a ground, but where is it on the Y cable?
On each of the two RCA cables, you have a tip (center) and a sleeve (outer). The two tips are right and left. The two sleeves are both ground.

Alternately, you can forgo this RCA business and just use a 1/8" plug. See here for TRS pinout. Follow the right-most column under "stereo".

Tip = Left
Ring = Right
Sleeve = GND.
Joe Perez is offline   Reply With Quote
Old 03-16-2010, 03:44 AM   #8
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

Thanks to both of you.
kenzo42 is offline   Reply With Quote
Old 03-16-2010, 03:49 AM   #9
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

One more question, what do you think is signaling the head unit that there is an aux. connected? In other words, how can I emulate a cd changer w/ no changer actually there?
kenzo42 is offline   Reply With Quote
Old 03-16-2010, 01:11 PM   #10
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,315
Total Cats: 1,913
Default

Quote:
Originally Posted by kenzo42 View Post
One more question, what do you think is signaling the head unit that there is an aux. connected?
No idea. My guess would be that they communicate over the data bus line.

Quote:
In other words, how can I emulate a cd changer w/ no changer actually there?
Obtain a serial data analyzer, capture and analyze the datastream that passes between the two devices, learn assembly, build and program a microcontroller to emulate that communication, connect it to the data bus, profit.
Joe Perez is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Hi turbo kitten nelson8708 Meet and Greet 11 09-06-2015 10:49 AM
Fun with a Sawzall rharris19 General Miata Chat 61 06-28-2012 09:50 PM
Hacked up my fenders to fit the 275ís. bbundy General Miata Chat 33 01-17-2010 08:24 PM
Track Day Prep Stein Insert BS here 12 05-13-2009 08:15 PM
EMB where to get cable for laptop? Project84 E-Manage 3 09-03-2008 05:24 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:41 PM.