2000 rodeo 4wd

when i push the 4wd button on the dash,the actuater on the transfer case(rear) engages,but the front does not.
also,the 4wd light never stops blinking now.until i push the button again to
turn it off.
i cant get it to go in 4wd.
is there something on the front to engage the front wheels into 4wd?
some kind of selenoid or actuater?
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