2004 4 Runner 4 wheel low problem

[Pug 65]

My 2004 4 Runner 8 cylinder has all time 4 wheel drive and it works good.
However, I can't get to go into 4 wheel low.
I put it in neutral or park. It just blinks and beeps.
I drive it a few feet slowly then again neutral and 4 wheel low and it just blinks and beeps.
I don't think that it has a tranny dipstick to check level.
Any thoughts why no 4 wheel drive low???

Pug

 

[gptoy96]

See reply in your double post in the general section.