If the Tires wont spin then it isnt locked in.
If it really is engaged like you think it is and they dont turn then something is broken in the differential. If that was the case then it should be makeing lots of noise.
Now it is very very common for the electro-mechanical device that engages the the 4wheel drive at the differential to go bad. If you look at the front differential you cant miss the 4 wheel drive actuator. It has a couple wires that come out and plug into the wiring harness.
Usually if this part fails I understand the 4wheel drive indicator lights wont come on? I could be wrong on that. My sub is 3 years older and that was the case with it.
Check the electronic device of the front wheel drive ,check its fuse, with the help of an electrician ,if working manualy check with a mechanic,sometimes wires which RE CONNECTED with differentials they are worn aor get dmaged,where are the simple times where no cars on the planet??!so many problems with this technology...
Power distribution is spread 20% to the front wheels & 80% to the rear wheels maybe 30% 70% the reason being that if the front tyres spin while the rear tyres are spinning the car will generally only travel straight ahead & traveling straight ahead on a corner is bad
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