How To: Build and Hardwire an Auxillary Input to OEM Stereo
 

Edit for 2014:
-Yes, you can use a bluetooth stereo adapter to get A2DP wireless audio with this modification, The Monoprice unit (id 7364 ~$20 http://www.monoprice.com/Product?c_i...seq=1&format=2) works just fine.
Concept:

How this works is that 4 SPDT (single pole double throw) 12v Relays are used to switch between the factory CD changer signal and external source (must be preamp) before the sound goes into the OEM amplifier.

because of this, you MUST have a somewhat working CD changer, as long as it turns on you're fine.

This SHOULD work on any lexus model that uses a CD changer that gives out a preamp. output (pretty much all iirc).
Confirmed Applications:
LS400 (all years incl. NAK** and Navi cars)
GS300/400 (98-02 incl. Nak**, ML, and Navi)
GS300 (1st gen https://www.clublexus.com/forums/sho...6&postcount=16)
SC300/400 (all years)**

**=will intercept signal between CD Changer and Headunit, not amp, needs to be done on SC300/400 (all), 98-00 GS3/4 with NAK, and 98-00 LS400 with NAK (NOT needed on non-nak 98-00 LS/GS)

Should work on:
IS300 (all years)
LX450/470 (pre 02)
SC430 (all years)

if i missed any its not because they wont work, its because i havent checked :)

Here is a basic overview of how the whole thing will look like, including specific instructions on wiring the trigger switch :)
https://www.clublexus.com/gallery/da...ng_outline.JPG

Materials:

1. 4x SPDT Relays @ $1.50/each = $6 (bulk)
2. 14x crimp on (female) spade connectors @ $3.25
3. 14x crimp on butt connectors @ $3.25
4. 4-5ft 18awg or better Speaker wire @ $.75/ft
5. 14-16awg wire for 12v power
6. spst switch (i used radio shack Model: 275-634)
7. 2x solder type Phono plugs @ $1.50/pair (4.99/4 radioshack Model: 274-319)
8. 2x RCA female coupler @$4/pair (radioshack Model: 274-874)
9. superglue-$1.50 (useful tip: avoid gel)
10. 2sq. in. 2sided padded tape @ $2 (optional)
11. Ipod dock to RCA output cable (for ipod specific install, use this because u get line-lvl (preamp) outputs :woot:)

***Since creating this tutorial Radioshack has started stocking FEMALE Phono plugs, which would mean you can save a bit of money by not having to use male plugs and female couplers. Radio shack model no. 274-337
Tools:

1. Soldering Iron
2. Flux
3. Solder
4. Wire Crimper
5. Wire Cutters
6. Wire Strippers
7. Needlenose Pliers
8. small knife/exacto knife
9. bravery
10. socket set (optional for install)
11. medium size screwdrivers (philips+flathead)

Props:
Salimshah for telling me to go check my wiring again :egads:
Horta for moral support :D


ADDENDUM:
http://i88.photobucket.com/albums/k173/rgarjr/ipod.jpg

http://i88.photobucket.com/albums/k173/rgarjr/sss.jpg
new pic 1-2011 below
http://img820.imageshack.us/img820/6297/auxinmod.jpg
^flashy layouts courtesy of member rgarjr :hello:

also, let me make it clear. I AM NOT SELLING THIS.

i have materials enough for 1-2 more ppl and they have contacted me during the development phase of my little project.

If, however, there is enough demand AND the CL Admin/Moderators don't mind there is possibility to change that.

Donations are accepted to help cover the cost of development :)
pm me for paypal

Before Starting:
A-cut 4 pieces of 18ga. speaker wire to approx 10-16in. (thats 4pieces meaning 8 ind. wires) and strip both ends, attaching female spade connectors to one side only. the other sides leave bare since these are what we will be connecting the factory headunit/amp lines to using butt connectors.

for reference, the Red wires will be going INTO the Amplfier (headunit on some models) and the black will be coming FROM the CD changer.

B-cut and strip 2 more pieces (4 strands) of speaker wire (can be shorter, mine were approx 9-10 in.). on one end connect 4 female spade connectors. on the other end (should be bare at this point) you will connect/solder on your RCA terminals. remember when doing this that in an RCA cable, the center is positive and the outside is negative.
*pic coming soon*


Step 1.
first thing u need to do is bind/connect/glue 4 of ur SPDT relays together so that the 86 and 85 poles are back to back as in the next image (which is upside down) Also labelling the relays makes later steps MUCH simpler.

http://i178.photobucket.com/albums/w...edCIMG0186.jpg

Step 2.
This is where the soldering skills come in handy, you need to connect all 4 relays in parallel (shown below) so that they energize at the same time.

http://i178.photobucket.com/albums/w...edCIMG0182.jpg

Step 3.
Connect the RCA tipped wires to the 87 Terminals on your relays. in this case, the red rca is right and the black is left, with red and black being + and - respectively.

http://i178.photobucket.com/albums/w...edCIMG0189.jpg

Step 4.
continuim to B-Cut 4 pieces of speaker wire (8 wires) approx 10-16in long. stip both ends and on one end of each crimp on a pair of female spade connectors. leave the other ends bare for now, they will get butt connectors later.

Step 5.
take 1 of the wires you just made, and connect the red to the 30 terminal on the L+ relay, its the one that is sideways to the rest. Then connect the black wire to the 87A termina, the one directly in the middle.

http://i178.photobucket.com/albums/w...edCIMG0198.jpg

6.Repeat step 5 with the next relay. in this case it was L-
at this point you should have this.

here is ONE channel, ie LEFT in this case, completed.

http://i178.photobucket.com/albums/w...edCIMG0201.jpg

7. repeat Step 5. two more times for R+ and R-
now you have this:
http://i178.photobucket.com/albums/w...edCIMG0209.jpg

(^shown with RCA adapters and iPod cable attached)

part 3 coming soon :)

Installing the relays into the harness (finally!!)

This is specific for a 95-00 LS400(w/o NAK) but the same basic idea encompasses the entire range of vehicles. the only differences will be which wires to cut, the location of the amp (or headunit/cd changer), and where u run ur power wire.

in the 95-00 LS400 the amp we are tapping is underneath the front passenger seat. we dont need to remove the seat to do this mod, just move it all the way forward and up.

http://i178.photobucket.com/albums/w...r/CIMG0009.jpg
using the flathead and philips screwdrivers, remove the 2 blanks from the AC duct under the seat, then remove the 2 screws and remove the duct itself.

http://i178.photobucket.com/albums/w...r/CIMG0011.jpg
this is what you should be looking at with the cover removed. say hello to your amplifier :hello:

http://i178.photobucket.com/albums/w...r/CIMG0013.jpg
remove the right most black plug and the orange one next to it, this orange plug is the harness coming from the OEM cd changer, and, consequently, the one we are most interested in.

http://i178.photobucket.com/albums/w...r/CIMG0014.jpg
the plug numbers read like a book, top left is Pin no. 1, and then number across. bottom Left starts with Pin no. 4.
for the 98-00 LS w/o nak or navi these are the pins we intercept.

Pin__Color___Signal
2____black___CDR+
3____Red_____CDL+
5____White___CDR-
8____Green___CDL-

http://i178.photobucket.com/albums/w...r/CIMG0015.jpg
snip snip. best to do the cutting/crimping one wire at a time.

http://i178.photobucket.com/albums/w...r/CIMG0016.jpg
Black goes to harness and red goes into the amp/plug.

http://i178.photobucket.com/albums/w...r/CIMG0017.jpg
now you have this. see why labeling is a good idea...

http://i178.photobucket.com/albums/w...r/CIMG0019.jpg
now repeat the last couple steps for the rest of the signals and you ahve this.

definitly interested in this. ill try it and let you know if it works on an RX

Beautiful job man!! :thumbup:

It does work on the 1SC-- (=confirmed) -- However, a signal/line driver may be desired if your mp3 player's output doesn't match the gain of the CD changer source-- (Mine doesn't) Ipods are louder than my olympus player (500i -- 20g -- full color touchscreen)-- So ipods may be fine without a signal driver inline--

This is a very good mod by the way-- I will also be testing what signals the head unit needs to switch to cd w/o the changer present at all-- (not sure how that'll go yet, but hopefully well) .. It may be that all the h/u needs is a certain resistance on one pair to think the changer is there and powered up--

Why not just use a 4 pole double throw relay? I've personally used this tons of times in the past, much cleaner install, less wiring, less chance of failure. Every relay will need 12v & ground of some sort. Why add wiring when you don't need to? You'll probably pay slightly more for the 4 pole relay, but it's worth it. This will work on any CD changer or any audio source for that matter as long as you can tap into the pre-amp level inputs...

http://freespace.virgin.net/richard.deas/relay1.jpg

Good info. for the board though...

4pdt relays will work but the issue is finding them to work with 12v. i looked and found them after a while but the place only sold in bulk

the plus with using SPDT relays is that they are VERY commonly available.

why arent the pics showing up?? must find a new host now :doh:

If the mods don't mind me posting as i find this link pretty useful for the thread, though it is ebay, these are pretty good prices. Then again i dont know much when it comes to electronics.
http://cgi.ebay.com/Aromat-NF4EB-12V...hippingPayment
So they would run about 10 bucks shipped anywhere in the US.

Moderator Edit: ebay link may not work long-term.

actually i wouldnt reccomend that unless u have a decent bit of experience working with PC mount relays. the pins are TINY and pretty impractical unless u plan on mounting it on a PCB.

that was another isssue i had with 4PDT relays - they are mostly PC mount only.

Puredrifter you have a pm thanks.

Make that 2! :)

procedures are up :)

next update will be prolly in a week or so. it will be a step by step installation ( in this case in my Dad's LS)


also, let me make it clear. I AM NOT SELLING THIS.

i have matierals enoughh for 1-2 more ppl and they have contacted me during the development phase of my little project.

If, however, there is enough demand AND the CL Admin/Moderators don't mind there is possibility to change that.

Donations are accepted to help cover the cost of development :)
pm me for email

Hell of a job so far, cant wait for the rest! :thumbup:

This looks awesome man. I can't wait to try this myself. I'm a complete newb to wiring and such so I have a couple questions. Is a B-Cut just stripping the protection away from the wires themselves? And on the 4 SPDT relays, did you just sodder all the 85s together and all the 86's together.

Also, where can an "iPod dock to RCA output cable" be purchased?

Great job doing this and great pictures btw.
*two thumbs up*

PureDrifter: would this work on a 01 gs300 w/navi?

yes .

i see that you are doing this project on a ls400 ..are you going have a digram on a gs w/navi? thankz

I saw this in person at the meet. His installation was very clean. The sound was crisp. I can't wait to do this myself once I have time.

after i do/post the install il post up what each gen. of car needs to do.

thankz cant wait to do this project
:woohoo:

Good deal. Brings up my last question - from what I can see, this cable doesn't charge the IPod does it. O well.

no, i was unable to find any cable that did this and it seems that the only way i get it to charge would be if i made my own cable, which is a big project that i just dont want any part of :p

my ipod lasts a week on average on a full charge :)

I guess thats true if you have the output volume on it turned all the way down with the setup you've made. I think I've fried my battery on it from using it soo much and always having it plugged in. Mine lasts for ~3 hours volume 2/4 to 3/4.

output volume will make no difference since the sound u pull from the ipod is coming through the dock, meaning its preamp sound. thats why the volume on the ipod has no effect on the volume through the stereo.

Check out this cable @ http://www.autosound2000.com/ipodadapters.htm

audio/video and power hook-up for charging $29.95 :thumbup: (it's about half way down the page)

http://i150.photobucket.com/albums/s...iPodAVDoc1.jpg

thats pretty much it, they have this one though which is even more better suited since we dont need video :)
IPOD-RCA CABLE ADAPTER
$24.99
http://www.autosound2000.com/a2000/i...odRCAPlus1.jpg


but my iPod rarely leaves the car and a week is just enough time for me to bring it inside, charge it and reload all my podcasts :p


Oh, and the 3.5mm miniplug is an additional preamp output ;)

So that's what the 3.5mm was for!

Did my own version, thanks Puredrifter for the help though, really easy once you figure it out :). Heres a pic of it :)http://i83.photobucket.com/albums/j3...g?t=1174449984
Its the plug at the end :).
http://www.youtube.com/watch?v=urOFqTN8NhwVid of performance.

Now all we need is a schematic for an auto-sensing turn on ic to trigger a single
4pdt relay -- I'm looking into doing this with a transistor that will see the 25mv ~ or so from the ipod or other mp3 player being produced when the player is in between songs-- (otherwise it would auto-switch back to the changer betweens songs) --

I'll be measuring the output at full volume from the headphone jack during and between songs-- then choosing an appropriate value transistor to trigger a single 4pdt relay to make this whole process automatic--

I wouldn't even be attempting this whole switching setup, but after removing my cd changer and re-installing it several times it's decided to start working again mysteriously on it's own...

:thumbup:

Keep up the good work-- I'm right behind ya-- though I wish I had an Ipod now instead of my Mrobe 500i -- it will only last about 6hrs before needing a charge-- and olympus hasn't released a car charger that I know about-- (that's just splitting hairs though)

PureDrifter, any update on Part III yet?

will be up by sunday night.

basically shows how to wire the switch+run the ipod cable. i put both in the lower center console box.

I don't wanna break balls or anything but this how-to looks familiar to one posted quite some time ago. For those of you who are waiting for pictures on how to complete the project there are more than enough instructions in the thread below.

"Adding audio input to SC430 for MP3 or satellite radio ..."
https://www.clublexus.com/forums/sho...d.php?t=120322

i have seen that tutorial and it is similar but i firmly believe that a switch does NOT provide enough isolation for the inputs. i tried a similar switch (only on 1 side, didnt have a 4pdt switch on hand) and could still faintly hear the cd changer coming through the ipod signal.

the no.1 reason im using relays is that each channel is switched individually, with no possibility for any crossover/contamination of the input signals.


ps. tut. is on hold for a day since photobucket wont let me load pics :p

PureDrifter: can you post up my car digram also 01 gs300

idk about a diagram but i can tell you which plug/wires to tap/cut?

il have it by toms.

Waiting on Pt. III
 

Thanks for the original post and I'm waiting for the next set of instructions.

any updates on pt.3 thankz

yea any updates for part 3,

waiting for update too...

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