hzhao

ObsidianBl

ObsidianBl

Alright, here is my rendition of the quick tap turn signal mod. Thanks to @Hzhao for paving the way for this project, to @Acrad for the Posi-Tap and online Electronic wiring diagram website, and to @tecman for originally posting the GX relay diagram.

I originally wanted to make an adapter for the GX so I didn't need to tap into the wires and keep it 100% stock. During my search, I could not find a Toyota/Lexus part # for just the connector piece that matches what you see on the OEM turn relay. I went out and bought a turn signal relay to try and modify as a connector. I shelved that idea, due to the extra work that was involved. I would have had to either de-solder the OEM relay or snip the pin leads and then hot glue the pins to the connector.
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Parts Needed:
Aftermarket 8 pin relay with quick tap turn signal

• I used the Diode Dynamics Smart Tap ($60)
  • https://www.diodedynamics.com/smartt...er-module.html
• Closeup pictures of the Smart Tap and instructions
• This relay has adjustable turn signal lengths (from 3, 4, 5, or 6 clicks)
• It also has a departure feature, where your turn signals stay on for 10-90 of seconds to light the way to the vehicle.
• It also has about 8 custom hazard functions.... Watch the video on their website... "http://vimeo.com/232843697"

8 pin wiring harness

• This was a used part from Ebay. It came with the OEM Toyota relay ($12)

8 pieces of the Posi-tap (Part# PT2426)

• for 24-26 gauge wires. Purchased on ebay ($12.90)

10mm socket + socket wrench
Plastic Trim Removal Tool or flat head screw driver
Phillips Screw Driver
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Initial steps to access turn signal relay
Removal pictures to see the OEM turn relay is here.
The flasher relay is very easy to get to. I accessed the relay by removing the following:

1. Mirror and odo control panel
   • Remove the wiring to the mirror control, dash light and ODO. Press in the tabs and pull the wiring.
2. The D-shape dash side panel that goes up against the driver side door
3. Driver side air vent closest to the driver side window.
   • The instrument cluster bezel will pop out as you remove the air vent.

Everything is held in by the clips on the upper portion. I was able to get the panels off just using my hands. I didn't need the panel removal tools until I reached the lower cover where the knee airbag is.

Next minor steps are

• to remove any floor mats
• to remove the knee pad trim that is directly to the left of the gear shifter and to the right of the gas pedal. This is also held in by clips and can be removed with or without the pry tool. We need to remove this to fully drop the lower dash panel .
• to remove the plastic trim cover located to the left of the dead pedal. This hides a bunch of connectors and wires. This was tricky to remove. There is a black mushroom looking lock that is directly to the left of the dead pedal. Once removed you can pull the trim towards the driver seat to release a plastic pin. There is also a metal pin underneath the door sill area. Pictures can be seen here because this piece will come loose. Pic #1, Pic #2, Pic #3

Lower Dash Trim
The lower dash panel is held in by purple and white pressure clips and x2 10 mm bolts. The image below shows the inside after it was removed from the dash.
Note: The x2 10mm bolts are on the far left and far right. The one on the right is hidden by a plastic cap that needs to be pried downwards (using your pry tool or flat head screwdriver)

Lower Dash Removed
Hidden 10mm bolt (located above the gas pedal area)


8 Pin Relay wires with Positaps connected
These were purchased from ebay and arrived in 2 days. This is really ingenious. Something simple enough that works really well. The wires for the turn signals are about 22-24 gauge. Looking at Acrad's post, it looks like I was supposed to tap into the OEM turn signal relay wires first and then connect it to my donor wires. I think either way will work.
Picture is seen here

Turn signal wire harness
Wire Harness Diagram (with wiring color codes)

• Note:
• the GX wiring connector diagram is looking at it from the BACK
• The 8 pin wiring connector diagram is looking at it from the FRONT

Online Wiring diagram to confirm the color codes and #'s (See black rectangular box)
Wire harness from the GX

Installed
Wires connected/tapped
Closeup of the Posi-Tap
Smart Tap to the 8 pin connector
Zip tied to the wire loom that has the headlight washer and traction control

• I zip tied it here so it would be easy to uninstall and reattach the OEM connector if I needed to tow with the GX.

Cons to the Diode dynamic relay

• Arrival Lighting does not seem to work
• The turn signal clicks seem to be lower in volume/tone (or I'm starting to loose my hearing in that spectrum)
• On initial testing it is not compatible with Hzhao's OBD auto folding mirror module
  • This is due to the hazard flashing on the OBD module
  • I think the non hazard flashing module from Aliexpress will work

So far, this has been tested on a 200 mile road trip (without towing) and has worked flawlessly.
Let me know if you have any questions.

Otherone

I completed this mod this morning. It was fairly simple with the detailed write up above. I was an idiot and started to wire it to match the numbers (i.e., 1 =1) instead of the matching functions, but when nothing worked I realized what I did.

This doesn't appear to interfere with my auto fold module since I got it without the flashing. Also, it doesn't appear to have the arrival lighting, but I don't really care about that and plan to turn down the departure lighting to its minimum setting. For the sound, I don't notice any difference but I mounted the relay next to the vent so it may just be close proximity that makes it appear to be the same volume. With the wiring in place, if I ever need to revert back it should be quick with no tools; just pull the mirror controls panel and vent out then swap the plugs. So far very happy with it.

ObsidianBl

ObsidianBl

Clay

This is also high on my list of things to mod on this vehicle.

binhster

hzhao

If you don't care about 30A towing relay, all you need are 8 pins as I have done.

binhster

hzhao

You are correct. Other wires are just for the trailer combination lights.

Agarakon

I ordered a Diode Dynamics smart tap relay. I have one in my Subaru and love the convenience of it.

I pulled the lower dash apart and found the flasher relay in my 2010 GX 460 is an 18 pin setup versus the 8 pin from Diode Dynamics.

Is this consistent across the 2010-2016 model years?

Is there another company that makes a replacement relay that allows LED and is programmable?

Thanks everyone!

ltsr

I emailed Diode Dynamics a few months back, they don't support the GX460.

I'd be curious to see what else we can do short of replacing the stalk (which someone here has done)

Agarakon

Nice of them to list them for sale and sell one to me eh?

ltsr

If I use the "search by vehicle" function, all that lists for the GX460 are LED bulbs.

But I did see this:

https://www.diodedynamics.com/led-fl...xus-gx460.html

can you share a link to what you purchased?