Four-wheel drive problems

My 4wd will not engage at all and the light blinks in 4 high and blinks and beeps in 4 low. I replaced both the transfer case actuator and the ADD on the front diff but nothing has changed. When I turn the knob there is a click behind the glove box, but nothing at either actuator. Is there a relay, or another sensor somewhere that I am missing?

 

You may want to change your title, help is reserved for those that are stranded or needing emergency assistance.

You need to check and post your limit switch voltages here so we can see what's going on.

For info on troubleshooting the 4wd system see the thread below.

https://www.tacomaworld.com/threads/4wd-system-operation-help-thread.742420/

 

Welcome To TW....