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

[Cozmo]

I've read through this whole thread, and I'd love to be able to do a mod like this to use my iPod without a lame casette adapter. I understand that it wont work if the head unit wont switch to CD. I've got a 92 SC4, with the Pioneer CD player. Does anyone know if there has to be a magazine present in the CD player for the head unit to switch? The CD player appears to power on, but there was no CD magazine when I bought the car, so I dont know if its working correctly or not. Thanks.

[89MA70]

would connectiong a Mini-to-RCA be the same and the ipod adapter? (for non iPod application)

[PureDrifter]

it will work, but the sound wont be as clean since you likely (on most other mp3 players) be using a preamp input

[panasonic]

Hi does anyone have in PDF format, wiring schematic for 1997 LS400 ?
I'm looking for the speaker and subwoofer wire to install a DVD/MP3 player.

Thanks.

[1SICKLEX]

Originally Posted by panasonic

Hi does anyone have in PDF format, wiring schematic for 1997 LS400 ?
I'm looking for the speaker and subwoofer wire to install a DVD/MP3 player.

Thanks.

Please start a separate thread. THanks

[Oliverted]

We made this and the day we finished it a smaller relay appeared ,so this is now MK 1 once the smaller dongle is finished I would like to install it.
Maybe using the the passenger heated switch to trigger the device I could avoid making any holes for switch ?
?
I have a 99 with the nak I have looked but before I go chopping wires could someone confirm the pin outs for me?

[gman44116]

Would anyone be interested for a fee to make these parts required? I have a 2000 gS300 with stock stereo no nav. I would be willing to supply all parts..

thanks for your consideration.

[blkjap]

Originally Posted by PureDrifter

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 http://www.clublexus.com/forums/show...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


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 )

***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
Horta for moral support


ADDENDUM:



^flashy layouts courtesy of member rgarjr

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

WOW, THIS IS GREAT. I LOVE THIS SITE..... Hope I can get it right.

[tonysgs300]

holy shiite thats alot of work to get an ipod working? wouldnt it be better or at least faster to buy a new cd player?

[PureDrifter]

Originally Posted by tonysgs300

holy shiite thats alot of work to get an ipod working? wouldnt it be better or at least faster to buy a new cd player?

if you think this is bad good luck getting your sub working with an aftermarket headunit using the oem amp...

[DJ420]

Kudos. This write-up is awesome!

[mkaye]

is it still a problem if the HU has sub outputs?

mark

Originally Posted by PureDrifter

if you think this is bad good luck getting your sub working with an aftermarket headunit using the oem amp...

[PureDrifter]

Originally Posted by mkaye

is it still a problem if the HU has sub outputs?

mark

only if you bypass the OEM amp and add in an amplifier for the sub separately....not worth it for the stock 8in sub.

[waseem3000]

Pure Drifter sorry to bother you but is it possible to tell me what wires to bypass for LX470 w/Nakamichi (Year 1999 American Specs) as I already made the relays and everything else ready and just need to know where and what wires to bypass. If you need pics of the wires I can get them and post them here. Also for the LS400 w/o Nakamichi (Year 1999 American Specs) the instructions are the one you provided in the begining as I just wanted to clarify as I will be doing this for both my cars.

This is an excellent writeup and thumbs up to your work!!! Keep it Up and Good Luck for your studies as recently finished and got an Aeronautical Engineering degree and I know how hard studies can get! So best of luck and keep up the good work! And thanks in advance!

[waseem3000]

Originally Posted by waseem3000

Pure Drifter sorry to bother you but is it possible to tell me what wires to bypass for LX470 w/Nakamichi (Year 1999 American Specs) as I already made the relays and everything else ready and just need to know where and what wires to bypass. If you need pics of the wires I can get them and post them here. Also for the LS400 w/o Nakamichi (Year 1999 American Specs) the instructions are the one you provided in the begining as I just wanted to clarify as I will be doing this for both my cars.

This is an excellent writeup and thumbs up to your work!!! Keep it Up and Good Luck for your studies as recently finished and got an Aeronautical Engineering degree and I know how hard studies can get! So best of luck and keep up the good work! And thanks in advance!

Guys is there anyone who can help me with the wiring for LX470 for installing this mod.. I have searched everywhere and cant seem to find it. so please can anyone help me... I will be very glad and thankful.