Alternative Differential Locker Mod. by "dbbd1"

We can call this this DBBD1- wire mod.
It is just that, an alternative. I liked the relay idea that a lot of you have done but I was not comfortable with a few things, mostly cutting that many wires, but more importantly, you could engage it at any time. I am not the only one to drive my truck, wifey does on rare occaisions, as will friends in need. I did not want them looking at the locker switch and thinking "oh, what does this do" and engaging the locker at 60mph! With this mod, you engage my switch (fools the ecu), then hit the stock locker switch when you want/need it. My way is easier, only one wire to hookup to a switch then from the switch to ground. What we are doing is fooling the 4wd ecu into thinking that the truck is in 4low. We are going to just short across the 4low switch that is on the transfer case. When your truck is in 4low, it shorts this wire to ground anyways. We will just do this with our internal switch. The only downside to this is that if you start the truck with the switch "on," (truck thinking that you are in 4low), the green 4wd light on your dash starts blinking. If you flip the swtich after you start it up, all is fine. I can live with that. It will still lock up though, even with the greenie blinking. It disables ABS (on my truck) and I assume VSC on those of you that have it. All other functions are the same and it works just the same as the relay version of this mod, locks up and will accept whatever speed you want to go. Now the pic's.


Here is a write-up on removing the glove box (sorry for the hijack of the pic's)
http://www.toyotanation.com/forum/showthread.php?t=170576


This is the connector we are looking for. It is to the right and up, behind your glove box. You can see it in 6th and 8th pic's down. It is the top connector on the white plastic box of connectors.



I just "tinned" the wire (put solder on it, gave it some rigidity) and stuck it in next to the top left wire. It is yellow w/black stripe. Just squeezed it in there and put a couple of zip ties on all on all of the wires to keep it from slipping back out. It stays in there nice and good. I then ran that wire over to my switch. (Yes, there are actually 2 wires there. I had a 4-conductor cable that I used, so I ran 2 to the switch from there and 2 to the ground from the switch)




Then ran the wire from the switch to the ground, same as shown in the TPMS mod referred to above.


Now to go out and play. Remember just to flip the switch after the truck is "on" and you are good to go. Then all you need to do is hit the locker switch when you want to lock up.

 

dude you are amazing. i just did this mod in 2 minutes and tested it out and all is well. thanks for a great tip.

 

So I did this mod today, and it turns out the ECM doesn't like it.

Drove around the block and on came the CEL. Pulled the code and had a P2772 - Low Range Error. Apparently the ECM looks at both the low range switch and the 2H-4H-4L switch to make sure they agree. Well, since they don't with this mod it will throw a CEL. And, with the CEL on and the P2772 stored the transmission (auto) will NOT upshift into 5th gear.

On to the relay mod I guess...

 

this makes me not want to do it.. any way to do this without using another switch? idc that it can be activated anytime...

 

Holy thread revival Batman!

 

I have a Reg Base Cab with the 2.7L someone was telling me it won't accept this mod cause it's not an Access Cab or Dble Cab and is not a TRD.
I've read some stuff about it and I'm like really gona be PISSED cause on the bed of my Truck it says TRD and all that happy horse crap. I read a mod somewhere here and it was talking about cutting a yellow wire with a "THIN" black stripe on it "second one down from the top" which I did, and have this button on the drivers left side dash panel with a vehicle symbol and squiggly lines like is sliding. I push it and no lights or anything when in 4H or 4L except the 4L light flashing and no sound. But I can't tell if the truck is doing a dang thing. Soooo, I put the wire back together temporarily and now all those light come on and except the squiggly line light goes out and the Auto/LSD light goes out when I shift into 4L. but the 4L light indicator comes on and does not flash.

I apologize if I'm posting this in the wrong place, I'm just lost as all Hell and I'm torn to bits over the BS cause I don't understand what the deal is.

Thanks for all and any help from ya'll.

 

what year is your trk

 

Can you upload pics of how you wired the switch in. I want to do this the right way the first time.

 

Are the only one on here that can't figure out what wire it is? Am I just completely missing an entire sections to this?

 

I know this thread is kinda old but I just finished this mod a few weeks ago and works great! Thanks @toku58 for the great write up.