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 Post subject: Bluetooth Mod for OEM stereo
PostPosted: Sun Jul 07, 2019 9:22 pm 
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Hi All,

Now that my Jeep is 11 years old and I just got a new iPhone XR I am starting to wish for a new stereo. I would love to be able to send tunes to the Jeep’s stereo via Bluetooth but my model of radio is not designed for that.

Image
(Image from AllPar)

There are 3 plug and play options I see. 1) Get the Mopar UConnect module for $2-300. It’s still expensive even though it’s old and probably obsolete. 2) Get a new stereo for $3-500. I like the touchscreen ones with Apple CarPlay. I don’t really have the money for either of these options though. 3) Get a cheap usb powered Bluetooth module that plugs into the aux jack. Functional but ugly. (Fugly?) I don’t like to have stuff hanging off my radio.

I have a plan for a fourth, inexpensive but more elegant option that I’m going to try out. I ordered a Bluetooth receiver chip from EBay for under $5. When it gets here on the slow boat from China I plan to install it inside my stereo where it will be hidden. I have a little soldering experience repairing a few devices around the house, so I think I’ll be able to do it. Here’s the plan:

Bluetooth receiver chip from eBay:

Image

The power input is 5v so I got this 12v to 5v dc to dc converter for about $3:

Image

It is a basic micro usb. I could wire it to the chip directly but since it already has a micro usb adapter, I figured that would be easier. I’ll draw power from the pin on the radio harness that has acc power (not on all the time). I don’t want it to drain the battery when the Jeep is off.

The Bluetooth chip also has a headphone jack, so this is the sound output. I’ll connect a spare head phone cord and solder its wires to the back of the circuit board where the radio’s aux jack is connected. Everything will be hidden and the oem aux jack will still function as designed when I am not streaming Bluetooth. Again the sound wires could be directly soldered to the chip, but since the jack is there I’ll use it.

Image
(Image from AllPar)

Lastly, the aux button on the radio only works if something is actually plugged in. I got this to leave in the radio’s aux jack so that the radio thinks there is an external connection. But it’s nearly flush and pretty subtle and only $0.99.

Image

A couple of things about this chip. It can pair with a phone as soon as it’s powered on. It doesn’t need an on/off or search-for-connection switch. This is good because I won’t be able to reach it once it’s physically inside the radio. It should be reasonably silent when not in use. I’ll see how well it does when I try it out. If the power source is noise free, the sound should be too. Lastly, this is a Bluetooth receiver only, so it can’t be used as a hands free phone device (no microphone connection). Oh well, I’m doing this for tunes not talking on the phone!

I’ll report back on how this goes once I have a chance to try it out. Shipping takes about a month since it’s coming from China, but shipping was free and I can wait. :POPCORN:

I got two of these, one for the Jeep and one for my 1990’s Yamaha amplifier in the living room, for a grand total of $17. So if it doesn’t work, I am not breaking the bank!

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2008 Liberty Sport 4x4 Automatic
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Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
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M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Mon Jul 08, 2019 2:40 pm 
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I bit the bullet some years back and replaced my in-dash unit altogether, but this looks like a very cool project. I am looking forward to seeing how it turns out. :D

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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Mon Jul 08, 2019 5:01 pm 
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Thanks for following, Prof!

I’ll update this thread once I have a chance to play around with the new gizmos. Their arrival time is supposed to be sometime between July 20 and August 30. Not kidding when I said the stuff is on the slow boat. Lol.

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


Last edited by lfhoward on Mon Jul 08, 2019 8:55 pm, edited 1 time in total.

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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Mon Jul 08, 2019 6:20 pm 
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I've had some slow-boat orders of my own. Sometimes it has taken so long that by the time it arrived I had forgotten that I ordered it. :SOMBRERO:

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927/948 OME Springs - Bilstein Shocks - JBA Upper Control Arms - Rage Black Widow Roof Basket - Viper 3606V Alarm System


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Wed Jul 10, 2019 9:39 pm 
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The slow boat (or at least one of them) has come into port!

I had to try this asap!
Image

My 1997 Yamaha amp has joined the 21st Century!
Image

That’s a 5 volt micro usb charger from an old Samsung flip phone powering the thing. That headphone jack wire goes to the Aux In on the back of the stereo, which is actually separate red and white connectors.

The Bluetooth chip is only temporarily suspended in the air, of course. I’ll mount it somewhere inside the case. The old phone charger can plug into one of the switched outlets on the back of the amp, so the chip will turn on and off with the stereo and doesn’t constantly suck power.

Rush’s Jacob’s Ladder was the inaugural song streamed to the stereo. Had to match the era of the stereo of course! It worked flawlessly. No background noise, even when I turned it up. Good sound quality. Good range as I walked into the kitchen with my phone and it didn’t lose the signal.

Next step after mounting the chip in the living room amp will be to put one in the Jeep. I’m still waiting for a 12 volt to 5 volt converter, which will be the equivalent of the old phone charger for the Bluetooth chip inside the Jeep. That cargo is evidently on a different boat!

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Wed Jul 10, 2019 9:48 pm 
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Looks great! :BANANA:

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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Wed Jul 10, 2019 10:52 pm 
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I bought a GROM audio kit for my wife's 05 Sebring. Yea it's not the cheapest thing, but it integrates with the factory radio, has a mic for phone calls, can answer calls and skip music tracks in any audio app, using the radio's buttons. Seriously considering one for the jeep.

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2007 Jeep Liberty Sport 4x4 3.7L 6spd
  • MOABs with Goodyear Wrangler All-Terrain Adventure With Kevlar 245/70R16
  • JBA UCA 4.5
  • OME 790/948/90009/N32
  • Western Suburbanite 7'4" plow
  • DetoursUSA Backbone
  • HF 12k# winch
[SIZE="1"]WTB: project liberty near N.NJ. stick shift, 4x4, working motor optional, CHEAP[/SIZE]


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Wed Jul 10, 2019 10:59 pm 
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sota wrote:
I bought a GROM audio kit for my wife's 05 Sebring. Yea it's not the cheapest thing, but it integrates with the factory radio, has a mic for phone calls, can answer calls and skip music tracks in any audio app, using the radio's buttons. Seriously considering one for the jeep.

That GROM kit looks like a great option. In my case I’ll just use my iPhone to control audio and leave it in the tray above the center stack. (I use it for Waze and it lives there anyway.) Do you have radio controls on your steering wheel? Mine does not and so there is really no reason for the Jeep to communicate and send any control signals back to the chip. There are other Bluetooth chips out there on eBay that have button controls for those functions and a microphone connector but I just went for simplicity. :D

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Thu Jul 11, 2019 5:39 pm 
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Just an update. Phase 1, proof of concept, is complete!

The 1990’s stereo is now even more awesome. The blue light gives it away.

Image

Phase 2 is modding the Jeep radio. I’m still waiting on some parts to arrive but I’ll update this thread when I start the project.

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Sat Jul 13, 2019 5:19 pm 
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This question is for anyone who knows anything about radio wiring harnesses. I got the following info from Scar0's reply to this thread: http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=88&t=78493

Quote:
Radio C2
B1 YL/RD 14 FUSED B(+)
B2 WT/OR 22 CAN IHS (-)
B3 NO CONNECTION
B4 NO CONNECTION
B5 NO CONNECTION
B6 NO CONNECTION
B7 GY/OR 20 AMPLIFIED ANTENNA FEED
B8 GY/LG 18 LEFT REAR SPEAKER (+)
B9 GY/DG 18 LEFT REAR SPEAKER (-)
B10 DG/LG 18 RIGHT REAR SPEAKER (+)
B11 DG/GY 18 RIGHT REAR SPEAKER (-)
B12 BK/WT 18 GROUND
B13 WT/GY 22 CAN IHS (+)
B14 NO CONNECTION
B15 NO CONNECTION
B16 NO CONNECTION
B17 NO CONNECTION
B18 NO CONNECTION
B19 DG/VT 18 RIGHT FRONT SPEAKER (+)
B20 DG/YL 18 RIGHT FRONT SPEAKER (-)
B21 GY/VT 18 LEFT FRONT SPEAKER (+)
B22 GY/YL 18 LEFT FRONT SPEAKER (-)


Basically that's what each wire is supposed to do in the big wiring harness on the back of the radio. What I want is ACC power-- 12 volt that's on when the key is on. I need this to wire up my 12v:5v converter for the bluetooth module.

Based on the following...
B1 YL/RD 14 FUSED B(+)
B2 WT/OR 22 CAN IHS (-)
B12 BK/WT 18 GROUND
B13 WT/GY 22 CAN IHS (+)

... I am thinking of using B12 for ground (-). That seems pretty standard, although maybe B2 would work also? Next is where to get the 12v ACC power from. Based on this it should be either B1 or B13. However, one of these is probably power on all the time to keep the clock and radio settings alive, and the other is ACC power. Do you think the ACC power is B13 because it references the CAN bus?

[EDIT: Found out the 2 CAN bus wires (B2 & B13) are where the radio talks to the computer. They can’t be tapped as a 12v source.]

I know I could tear it all out and start poking around with my multimeter, and it may come to that, but I'm hoping to have a good idea of what I'm doing before I begin operating. I'm not really into exploratory surgery!

Plan B would be to siphon ACC power from the power outlet, but having power come from the radio itself is ideal. (My heated seats mod already takes power from this power outlet and I don't want to overdraw it.) Any experienced radio techs here?

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


Last edited by lfhoward on Sat Jul 13, 2019 11:22 pm, edited 1 time in total.

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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Sat Jul 13, 2019 11:15 pm 
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I don't have steering wheel controls, and neither does the wife's car. It wasn't cheap, but it satisfied the high WAF requirement; she wasn't interested in an aftermarket stereo, wanted the OEM look and feel, and wanted hands free for bitching to her girlfriends during her hour long commute in bumper-to-bumper traffic. :-)r

_________________
2007 Jeep Liberty Sport 4x4 3.7L 6spd
  • MOABs with Goodyear Wrangler All-Terrain Adventure With Kevlar 245/70R16
  • JBA UCA 4.5
  • OME 790/948/90009/N32
  • Western Suburbanite 7'4" plow
  • DetoursUSA Backbone
  • HF 12k# winch
[SIZE="1"]WTB: project liberty near N.NJ. stick shift, 4x4, working motor optional, CHEAP[/SIZE]


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Sun Jul 14, 2019 1:37 pm 
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I’m beginning to consider installing a switch for the Bluetooth module power, since there is no ACC power wire associated with the radio. Also, I’m reading that it would be a good idea to install a 3 amp fuse ahead of the 12v:5v converter. Thinking about doing some electrical reorganization under the dash to clean up some circuits and make this all possible.

I have a 6 circuit fuse block under the dash that I installed a while ago. Currently circuits go to:
2nd dash aux power outlet 15A via relay
Rear 120w inverter and trailer wiring harness 20A

I’m thinking of running a separate circuit for the rear inverter so that the fuse block would be reorganized like this:
2nd dash aux power outlet 15A via relay
Rear 120w inverter 15A
Trailer wiring harness 10A
Bluetooth Module 3A via rocker switch

The only issue is the electrical background noise likely produced by the relay. If it affects the sound quality I’ll have to run a wire for the Bluetooth module direct to the battery. That’s what I had to do for the CB radio because of interference.

_________________
2008 Liberty Sport 4x4 Automatic
Image
Jeepin By Al 4" Lift Kit
Goodyear Wrangler Duratracs 245/75/R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack

M116A3 Trailer build thread: viewtopic.php?f=72&t=77997


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 Post subject: Re: Bluetooth Mod for OEM stereo
PostPosted: Sun Jul 14, 2019 4:25 pm 
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I believe if you ground the bluetooth board to the same point as the radio, that should help a lot with reducing feedback, but these radios seem to do a good job with reducing noise and hiss, I had done something similar with my 730N nav unit, because it didn't support bluetooth for music.

Not sure if you're aware of this site, but it can help you with finding power wires. I know the 4x4 switch has a switched acc power source

http://connectors.dcctools.com/home.htm


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