Okay here's the process I went through to install an aftermarket headunit on my 1992 Lexus ES300. Throughout the whole process, I realized how much of a pain in the a**
Lexus's were to modify. In order to modify any little thing, you literally have to end up taking a part everything...unlike my old 91 civic where everything was just plug and play. But in the end I ended up easily saving about $300, learned a lot about electronics, audio, and about cars! And I'm telling you now, I can pretty much outdo any guy at Circuit City or Best Buy...they weren't helpful at all, I went in there and asked them simple questions which they could not answer. STICK TO THIS WEBSITE AND FORUM...YOU WILL LEARN A LOT FROM CLUBLEXUS.COM
I have to give thanks to people like 92lex who really helped out
Speaker wire…anything will do really..get at least 24’
FLAT HEAD SCREWDRIVERS…at least two
A Wire Stripper/Cutter
Wire nuts, crimps, splicers..anything that will connect two or more wires
Rachet...for the passenger seat
Soldering iron if you want to solder
Protective Gloves…for detaching/attaching the battery terminals
INFO AND KNOWLEDGE
On my alpine the wires go as follows:
- 12V ignition power/acc
- Constant 12V power (battery)
Black - Ground
– Dimmer (which I didn’t bother to use)
– Remote (wired this to the remote of my Subwoofer Mono Amp)
And then the 8 speaker wires (+ and -) makes enough for 4 speaker hookups
LEXUS ES300 wiring diagram (amp under seat)
You will use this to figure out which speaker goes to what.
Here’s one I labeled for ya..
LEXUS ES300 Wiring Diagram (for radio/cd changer)
The Lexus ES300
wiring diagram is as follows (for some reason some of my wires were different then what others have said…I blew about 5 fuses just to figure out which one was the power for the stock head unit)
***Before I go on…I must tell you what confused me most about installing an aftermarket stereo. The wires leading to the speakers are not located or connected to the stock radio/dash area!!! They are connected to the AMP under the PASSENGER SEAT!!*** Refer to Step 6) to figure out what I’m talking about
<a href="http://imageshack.us"><img src="http://img233.imageshack.us/img233/9563/92es300stereowires6ui.jpg" border="0" width="663" alt="Image Hosted by ImageShack.us" /></a>
(Props to 92Lex)
with PINK STRIPE
– Power12V…goes to RED ignition wire on head unit
– Constant 12V…goes to YELLOW battery wire on head unit
(one silver dot) – Ground…goes to BLACK wire on head unit
w/ RED STRIPE
(ant) + PINK
w/ BLUE STRIPE (amp)
+ your aftermarket ANTENNAE = Will get your antennae to motorize and get a signal (..basically it will allow yourself to get radio)
***Before you do anything…disconnect the NEGATIVE BATTERY TERMINAL
and do not let it touch any metal…go out and buy a rubber glove to protect your hand when reconnecting it b/c it sparks
Take apart ac/radio/cassette player
---------There are 4 screws…start with bottom, then you have to take out the top grill to get the other screws (this is a B**ch) use this website..it will help:
----------I tried for weeks to get this and I finally got it..just be careful, be patient, and keep loosening each side by prying a little here and there, and then when u finally think u can pop it out…do it (I was so happy when I got it out without breaking it… I was about to get circuit city or someone to do it because I am a clumsy 18 year old kid..but I rather save 70 bucks)
Disconnect all the harnesses…by the way..when u disconnect the top right harness connected to the hazards…You will NOT be able to use your blinkers when driving
…so plan ahead b/c it is such a hazard to drive without blinkers.
Cut the very bottom harness, not the next one up that was connected to the cassette/radio player so the key wires are exposed…the rest just hide away
Connect power, constant battery, ground, and antennae wires…also the dimmer if you want…make sure everything works
PROPS to 92LEX
***AS I NOTED BEFORE...THE POWER IS NOT PINK with BLUE STRIPE...IT'S BLUE w/ a RED STRIPE
Take out passenger seat…there are 4 big screws located at each corner of the seat under some garnishing…just pop them off and unscrew…it makes everything much easier.
Again...props to 92lex for the pictures
Unplug and disconnect the harnesses to the amp, remove the amp, and CUT the wires leading to the blue connector
You can electrical tape up the grey and the two white wires in the middle.
What you must do is add/lengthen speaker wire to each of the speaker output wires from the aftermarket head unit and snake them under the carpeting to connect to the matching speaker wires that were cut from the AMP. Use the diagram I gave u at STEP 2.
***MAKE SURE YOU LABEL the ends of each wire…which one is positive, which one is negative, and where they belong (i.e. LEFT FRONT, RIGHT REAR, etc.)
I used wire nuts to hold the multiple connections together and then electrical taped them to secure them. The wire-nuts work well. Also make sure they clear the way for the seat to move forward and backward…I hooked everything up and when I moved the seat forward…it ripped the wires right out of the electrical tape.
***Optional: instead of having just 4 speakers working you can make use of the 4 other speakers (2 on each side: the “Squawkers” by the window in the dash and the “Door tweeters”) What I did was wire these in with the front door wires. I think 92lex made note that even though this does change the Ohm load on the stereo..it still sounds good. I just wish I had a multi-channel amp so I could control the power output or isolate the tweeters to just emit treble instead of full range sound. Other than that, it does sound amazing…it gives the overall sound a more complete sonic quality with the added highs (they bounce nicely off the window).
Make sure everything works and fit your dash kit in with the stereo. It’s easier to take off the ashtray thing to put the dash in nice and it also allows you to pry off the carpeting so u can fit the wires down the side.
Put everything back together. Make sure to be organized. Keep all the screws and tools in one place like a cardboard box where you can get them for later.
For those with subwoofers, this is what I did:
a) Disconnect NEGATIVE TERMINAL
b) Jack up LEFT FRONT WHEEL, take wheel off, unscrew and then take off the firewall plasticky stuff under wheel well so you can see the wires leading into the car.
c) From the battery area, snake the other end (i.e. not the end with the fuse) through the wheel well so it’s nice and snug.
d) Cut a slit into the rubber glove thing with a razor and snake the cable thing through…this is a pain.
e) Take apart trim and snake it through to the trunk.
f) the Audio cables (POS and NEG) and the remote cable (it’s a thin wire) coming from the Mono Amp from the Sub should wire on the opposite side of the car (to reduce signal noise) and should connect to the back of your head unit. Taking the trim off is very easy…it just pops off.
ANY QUESTIONS JUST PRIVATE MESSAGE ME***
Sorry for the lack of pics..but I just wanted to get it done with, and I’m not about to take my sweet system apart now?!!