GX470 Navigation + DVD Bypass Procedure

Step 1:

Remove the bottom plastic moldings that start just below the wood trim on the sides of the NAV. The easiest way is to use a flat object (like a putty knife) with a cloth over it to protect against marking anything. Once you begin to pry it up, you can just pull since the entire piece is held on via tension clips.




Step 2:

Pull off wood side trim. I pulled from the bottom. Again, it is held on via tension clips so a little force is all you need. BE EXTREMELY CAREFUL WITH THE WOOD PANELS. My driver’s side wood panel began cracking on the right inside near the vent.

Note: "A" is a wire harness that goes to the hazard lights on the left and "B" is a wire harness that goes to the passenger seat belt light on the right. Disconnect these to make it easier to work.



Step 3:

Remove bottom section (with Ashtray and lighter) buy pulling backwards (again, tension clips... Lexus just makes it so easy for us). You will need to remove the wiring harness attached to this as well so you can place this piece out of the way.

Note the circle where I had run the wires through the blank next to the "Second Start"

Follow the instructions below are for the 2003 - 2006 GX470

Click here to go to the 07+ instructions

Use socket wrench (you may need a 4" extension) to unscrew the 4 hex bolts/screws holding the Nav system in place. Remove the entire screen unit by pulling back toward you. You do not have to pull it out very far to have full access to the rear to get to the wires. I put a towel on my shifter to rest the unit against. There are (4) wire harness connections to the back of the screen. You want to remove the second one (circled) to access the appropriate wires.

The two wires you need access to are the Violet wire with red stripe on pin #5 and the light green wire on pin #13. If you will not be using a switch, cut the violet/red wire and tape the ends, then cut the light green wire and ground the part that goes to the screen. This will simulate the parking brake.

If you choose to use a switch, run 4 wires (2 for each side of the wires) to the blank next to "Second Start". I chose to use twist connectors on this install to make it easier to revert back to factory settings when I return my lease. "A" shows my splice on the screen side, "B" shows the splice on the vehicle side, and "C" shows my 4-wire run (one cable) which goes to the blank.

Install Switch. You can use a simple double-pole, double-throw switch from Radio Shack (about $3). They fit perfectly in the blank (there are several types). I drilled just a round hole just slightly larger than 1/2". If you drill it exact, the nut on the switch will hold it in perfectly. My switch is below.

I chose solder the connections on the rear of the switch since they are very close together and didn't want inadvertent grounding/crossing of wires.

Wire the leads from the screen to the "common" section of the switch. On one side of the switch, wire the corresponding wires from the vehicle side so when the switch is "on" the screen is set to factory default. On the other side of the switch (green wire only for e-brake), wire a ground wire. I used one of the screws on the side of the radio to make for a short run.

Throwing the switch up reconnects the original factory wires.
Throwing the switch down disconnects the violet wire and grounds the light green wire, allowing you to watch a DVD on the navigation screen.

Follow the instructions below are for the 2007+ GX470

Step 4:

After Following the instructions to take apart the dash (at the very top of this page Steps 1-3). You should see have access to the back of the Navigation unit, as pictured below:

Looking at the harnesses at the back of the Navigation screen you will see the connector that you will need to modify, it is the one closest to the Driver side of the Navigation screen. You will see the harness of interest circled in red below:

Step 6:

Below is picture of the Blank next to the 2nd STRT button with the Radio Shack switch installed in it. I used a drill to create the hole for the switch. I don't remember what side I used but it was greater than 1/2". Below are links to the a few of the different types of switch you may used for this MOD. I am not good at soldering so I used the quick disconnectors.

Part 275-695
http://www.radioshack.com/product/in...tId=2062525&cp

Part 275-691
http://www.radioshack.com/product/in...tId=2062521&cp

Below pictures are of the wires you need to cut. First of all I cut my wires very far from the white Navigation plug. I decided to cut very far away from the plug so that if the Lexus technician go searching far an issue with the Navigation system or radio he does not notice any strange wires close to the Navigation screen. Please pay attention to which green wire you cut. There are several light and dark green wires in the plug closes to the driver side. Cut the light green wire with the brown rings or dots.

You will need to purchase some butt splice or twist connectors for 18-22 gauge wires in addition to five 18-22 guage wires of 24" to 32" in length. I bought a cable that had 4 wires in it and 1 extra wire to run the ground wire.

Below is a picture showing the routing of the wires to the switch and to the radio for grounding.

Below is a picture showing the routing of the wires to the switch and to the radio for grounding. Directly below this picture is another picture showing you exactly how to connect these wires to the switch

Step 10:

Reassemble everything in reverse. This part should take all of 5 minutes. Lexus makes everything so that it snaps right back together nicely.

Here is some additional information that I found is useful to most Lexus vehicles

Unlocking the Navigation

(to enter addresses while Driving)

Note: This needs to be performed every time you shut off the car. Once the Override is activated, the nav system and phone system can be operated while the vehicle is in motion. The system returns to its default settings each time the car is started.

There are 5 different procedures here. These 5 procedures are unique, You will need to find the right one by completing the steps indicated below. I have included some notes right below the procedure number to help you indentify which procedures might apply.

 

WARNING: Be safe - only use this when a passenger can safely input addresses or phone numbers. The service menu contains other options that should only be used by a Lexus or Toyota service professional. Do not attempt to access the service menu if you are not a Lexus or Toyota service professional.

 

Procedure 1:

- for more current navigation systems (2007+ years) -

If you have the 6.1 version Navigation this bypass requires that you create a hybrid Navigation disc... you can follow the instructions on this webpage: Hybrid-Nav Instructions

Procedure 2:

( for most 2004-2006 navigation systems ) 1) Press "Menu" button
2) Press "Volume" on the Nav Screen"




3) Press the "speaker" picture on the top left screen




4) Press the bottom left corner of the screen (it's blank, nothing there)




5) Repeat steps 3 & 4
6) A screen should now Appear w/ several functions
7) Find the "Override" button and hold until you hear a "beep"



8) The Override button letters should now be in black as the others are white



9) Press the Back button and you are ready to go!

*** Keep in mind this feature is required to be done every time you start the vehicle. It will not retain this in memory ***

Procedure 3:

( for some 2002-2006 navigation systems )

Step 1 Press The Menu button
Step 2 Press the Volume button
Step 3 Press The Upper Left of the screen
Step 4 Press The Lower Left of the screen
Step 5 Press Upper Left of the screen again
Step 6 Press Lower Left of the screen again
Step 7 Press and hold the Override Button until system beeps
Step 8 Press Back Button in upper right corner
Done! The Buttons For Navigation & Phone are now accessible

 

Procedure 4:

( for some 2002-2006 navigation systems )

Older Lexus and Toyota Systems may require a slightly different process:
Step 1 Press The Menu button
Step 2 Press the System button
Step 3 Press The Upper Left of the screen
Step 4 Press The Lower Left of the screen
Step 5 Press Upper Left of the screen again
Step 6 Press Lower Left of the screen again
Step 7 Press The Lower Right of the screen
Step 8 Press and hold the Override Button until system beeps
Step 9 Press Back Button in upper right corner
Done! The Buttons For Navigation & Phone are now accessible

 

Procedure 5:

( for some 2002-2006 navigation systems )

Some versions may use the following steps:
Step 1 Press The Menu button
Step 2 Press the DVD button
Step 3 Press The Upper Left of the screen
Step 4 Press The Lower Left of the screen
Step 5 Press Upper Left of the screen again
Step 6 Press Lower Left of the screen again
Step 7 Press The Lower Right of the screen
Step 8 Press and hold the Override Button until system beeps
Step 9 Press Back Button in upper right corner
Done! The Buttons For Navigation & Phone are now accessible

WARNING: Be safe - only use this when a passenger can safely input addresses or phone numbers. The service menu contains other options that should only be used by a Lexus or Toyota service professional. Do not attempt to access the service menu if you are not a Lexus or Toyota service professional.

1. Push the “ODO TRIP” switch in the switch box to change the display to blank.
2. Turn the engine switch off.
3. Turn the engine switch on with the trip meter “RESET” switch held down.
4. Keep pushing the “RESET” switch for longer than 7 seconds after the engine switch is turned on.