Toyota 2006 Tundra Owner's Manual page 213

To activate the system, push the "AUTO
LSD" switch with the vehicle stopped.
The "AUTO LSD" is activated under the
following condition. At this time, the
"AUTO LSD" indicator light will come
on.
The driving mode is set in the two−
D
wheel drive mode (in the four−wheel
drive mode, the system does
work.)
Driving at a speed under 100 km/h (62
D
mph)
To cancel the system, push the "AUTO
LSD" switch once again.
202
'06 TUNDRA_U (L/O 0508)
If the engine is turned off while the
"AUTO LSD" indicator light is on and then
restarted, the indicator light will turn off
automatically.
not
Without tachometer
With tachometer
2006 TUNDRA from Oct. '06 Prod. (OM34458U)