No ATRAC

[06LC]

New owner of a 2006 100 series. Previously had a 3X locked 80 series, and also currently have a 5th gen 4runner with ATRAC. Just all that for context that I'm not new to the scene.

Heres whats happening: When I press CDL button, the 'VSC TRAC' and 'VSC OFF' lights come on, in addition to the CDL light. I then switch to 4LO to get through a gnarly off camber trail section, and both wheels with least traction just spin. Maybe feels like ATRAC is slightly working due to jumping of vehicle, but ultimately wont pull through the obstacle. Cannot hear the ABS working like I can in my 5th gen with ATRAC - which by the way, pulls through the same obstacle with ease. I also do not see the 'TRAC' light come on in the LC during this which from what I've read is not normal. Also, no alarm noise. Finally, when I switch back to 4HI and disconnect the CDL, I can hear and feel the CDL disengage, however the 'VSC TRAC' and 'VSC OFF' lights remain on until I restart the vehicle.

This LC has been on mud before and is tastefully upgraded. Cannot locate the previous user here though. Here is an updated pic. Any help is appreciated!

 

[Trunk Monkey]

Quick search of "atrac not working"

1

Post in thread 'Atrac not engaging help?'

Feb 1, 2026

Hey guys I have an 01 lc and for the life of me can not get the tires to slip on anything. It def feels like 4wd is being engaged but still haven’t heard the atrac “beep” or seen the light. I know the light works because it comes on when I start the truck but my question is aside from crawling up a mountain are there any surefire ways to test my atrac system or trigger it manually? I want to know that it works so I don’t have to find out the hard way. Thanks boys.

Mack,

If you look over on my thread. My 06 doesn't flip any lights on when the transfer case is in low. When I...

• 100s

 

[06LC]

Quick search of "atrac not working"

1

Post in thread 'Atrac not engaging help?'

Feb 1, 2026

Hey guys I have an 01 lc and for the life of me can not get the tires to slip on anything. It def feels like 4wd is being engaged but still haven’t heard the atrac “beep” or seen the light. I know the light works because it comes on when I start the truck but my question is aside from crawling up a mountain are there any surefire ways to test my atrac system or trigger it manually? I want to know that it works so I don’t have to find out the hard way. Thanks boys.

Mack,

If you look over on my thread. My 06 doesn't flip any lights on when the transfer case is in low. When I...

• 100s

Ya I read that one and any others with similar search titles. That one doesnt have a solution and cant find an answer in any others. Otherwise wouldn't have taken time to create an account and post this.

 

[06LC]

Update - I went out to the trail again and attempted the obstacle withOUT the CDL engaged. Was in 4LO and the ATRAC worked like a dream. To make sure I wan't going crazy I attempted the obstacle again in 4LO but this time with the CDL engaged - zero ATRAC.

On one hand I am glad it works, but it doesnt seem right. Any ideas?

 

[Dirt J]

The VSC TRAC light is a warning light, not an indicator light like the VSC OFF. So if VSC TRAC is illuminated there is an issue. This is per the owner's manual.

Since this only happens when you press the CDL, that makes me think it could be CDL relay or related components (3 sensors on the tcase). Looks like there is a black/blue stripe wire you can probe to test if the signal is going to the ABS module for ATRAC. You wire colors may be different due to year model.

 

[06LC]

Switched out the CDL switch on the transfer case and all is well. I do have to say though - this ATRAC doesnt bite as hard as the system in my 5th gen T4R. Takes a lot more driver input to get through an obstacle comparatively. I suppose I need a rear locker. Or maybe I was just completely spoiled by my 3x locked 80 series!