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Nav Delete Nav to non-nav

 
Old 04-12-19, 08:14 PM
  #1  
Margate330
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Default Nav Delete Nav to non-nav

Hi, I am currently working on a Nav downgrade on my 2004 RX330.
Why? Call me crazy but because I wanted to get rid of the factory outdated Nav system and put in a non-nav unit.
I am also installing a new radio with backup camera where the radio was but I haven't started on the yet but that should be easy compared to what I just did. lol
So far I have bought a used non-nav climate control unit with display on ebay used and it is installed and I have full control of the A/c and other stuff.
Right now it is a work in progress but the good news is that the non-nav unit is in and the A/c works.
For those wondering- it is NOT plug-and-play.
Tomorrow I will finish up on the wiring(I hope lol) but everything I need to work is working so far.
If there is any interest in a nav downgrade plz post below so I know.
If there is enough interest I will show where I'm at and what I've done so far.
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Old 04-13-19, 07:16 PM
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Margate330
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Hi friends,
I have finished the Nav delete.
Here is the before:



And here is the after:



Everything is wired in.
What it took- extra non-nav climate control unit used for $100. My old Nav one had broken a temp button and broken vents so that worked out well cuz the used replacement had everything working good.
The non-nav unit uses the same 14 pin plug from the Nav unit(but wired different) so that was good but it was missing wires in 3 places that needed to be there.
If I thought ahead and got a non-nav unit with the extra plug as I saw in some of the ebay listings it would've saved money because I had to buy an upper dash harness off ebay for $67 so I could rob a 14 pin plug off it to get my extra wire inserts to put in the connector where the wires were missing.
Now that everything is working perfectly I went back and took good notes.
It took many hours testing and pouring over schematics and chasing wires and luck lol but now that the wiring is working it can be done easily in an hour with simple splicing.
If I have time tomorrow I will post how I wired it on my car in case someone needs it in the future.
Honestly I like it better with the non-nav and I'm installing new back up camera and radio tomorrow.
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Old 04-13-19, 07:47 PM
  #3  
joedaddy1
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Crazy but nice work.

i wish China would make an android replacement. Seems like there’s enough 2nd gen RXs in the world to make it worthy.
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Old 04-14-19, 08:24 AM
  #4  
Margate330
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Originally Posted by joedaddy1 View Post
Crazy but nice work.

i wish China would make an android replacement. Seems like there’s enough 2nd gen RXs in the world to make it worthy.
What an excellent idea.
If they would make a kit for the non-nav version(most popular), the folks with nav would only need to run 2 wires under dash to gateway module to pin4(mpx+) and pin 11(mpx-) (which is a very easy splice) and they could use the aftermarket kit too.
One kit for both- nav and non-nav units have all other needed wires in the harness plugs- just different wiring hookup.
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Old 04-15-19, 05:41 PM
  #5  
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Job is finished. Everything went well.
Here is the finished work and how it worked on my car.
(Sorry about the sloppy handwriting and bad drawing I'm not an artist lol)

First pic below is my existing Nav harness plugs and the colors and functions of the wires I needed,



Next pic below is how I wired in the non-nav unit.


Order of steps I took.
Step #1: First I put the new non-nav climate control unit on the work bench bench and powered it up to make sure my power wires were correct using the +B, ACC, IG, and Ground wires shown.
When I saw it power up properly I unplugged the battery and spliced in the wires just mentioned and then hooked the battery back up and turned key on and watched the unit power up.
*Note- After completing this step I had no AC controls or Data or Temp on screen. Airbag light was lit in instrument cluster(speedo) and hazard lights not working.

Step #2: Next I removed the glovebox to get access to the Gateway ECU. Then I unhooked the battery and waited a few mins. Then I got under the glove box looking upward in the dash with a flashlight and located the Gateway ECU(a small box the size of a pack of ciggs and says "Gateway" on it). I disconnected the only 14 pin plug by squeezing the tab and pulling it out. Next ran 2 wires approx 2' long from the climate control unit carefully thru to the Gateway ECU and spliced in the MPX+ and MPX- wires as shown. Then I secured the wires up and out of the way so they can never be pulled or messed with. Next I hooked the battery back up and turned the key and started the car. Now the A/C controls were working properly and the data was on the display(temp, mpg, etc). Without jacking into the gateway the climate control display will do nothing.
*Note- After finishing this step Airbar light was still lit in instrument cluster(speedometer) and hazard lights not working.
**If anyone is wondering- the old Navigation unit also goes to the Gateway ECU to get its AC control and data but it goes to different pins on the ECU- thus the reason to run the 2 wires as shown.

Step #3: Next I unplugged the battery for a few mins and spliced in my LP(lamps?) wire. Then I spliced in my F(hazzard) wires. Then I hooked up the battery and turned the key. Now my red security LED was blinking as normal and hazard lights worked,
*Note- After finishing this step Airbag light was still lit by speedo but everything else was working good.

Step#4: This step made me very nervous. There is a warning in the Lexus Electrical manual that says no tampering, touching, or disrupting airbag stuff for 90 seconds after disconnecting battery for danger of setting off an airbag. It was my best educated guess as to the placement of this wire but I wasn't absolutely sure but I really didn't want to set off my airbag by sending a wrong signal to it by wiring it wrong... So next I disconnected the battery and took an extra extra long smoke break. lol This wire is important because it goes directly to the airbag sensor under the passenger seat so I gave extra time after unhooking battery, After waiting what I felt was long enough I spliced in the P-AB(airbag) wire as shown above. Then I started the car and after a few seconds the airbag light went off in the instrument cluster(speedometer) and everything was well.
*Note- After finishing this step everything was working properly. I took it for a drive, scanned for codes and no problems.

Step #5: Next I unhooked the battery again just to be safe. At this step somewhere in the illumination section in the electrical manual I saw 2 wires ILL+ and ILL-. I am not sure what these wires are for except for dimming purposes but not sure but I wanted everything I can find hooked up. so, next I spliced in ILL+ and ILL- wires. Then I started the car and drove it around and ran my errands. Came home and ran scanner and found no codes. Everything is working perfect.
*Note- Every time I've ever unhooked the battery and restarted the car it always ran a little different for a while. This is normal while the ECU resets and does it's thing.

That's it folks... lol It worked for me and I am just showing how I did it to help others.
Anyone who chooses to use my work do so at your own risk I am not responsible.
Good Luck Peace
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Old 04-16-19, 12:42 AM
  #6  
joedaddy1
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Cool.. for your next challenge...

Replacing factory CD player with the newer gen MP3 cd player...

Mine is broken, but the wiring of the new ones are different from older ones..

I am talking 06 vs 07...
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Old 04-16-19, 07:30 AM
  #7  
Margate330
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[QUOTE=joedaddy1;10494177]

Replacing factory CD player with the newer gen MP3 cd player...
How about putting in a brand new unit instead?
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Old 04-16-19, 07:36 AM
  #8  
joedaddy1
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[QUOTE=Margate330;10494305]
Originally Posted by joedaddy1 View Post

Replacing factory CD player with the newer gen MP3 cd player...
How about putting in a brand new unit instead?
too cheap. $75 vs $300
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