4 wheel drive won't engage fuse/relay location on the vehicle?

These are located in the power distribution box in the engine compartment near the brake master cylinder. Fuse #17 is for Electronic Shift On The Fly Relay,Transfer Case Shift Motor and relays #40 and #41 are Electronic Shift On The Fly Relay #1 and #2.

Do you have a air bag light lit on the instrument cluster ? I ask this because , if the air bag light is lit , could be a clock spring problem . I know ,what the heck is this guy talking about . You have a air bag on the steering wheel ,the horn button is on the steering wheel . The clock spring is located under the steering wheel , in the top of the steering coulmn . It has flat wire tape in side that allows the steering wheel to be turned full left to full right , keeping the horn , air bag , an any other button's on the steering wheel connected electricly to the vehicle. Plus there is a relay , when you push the horn button it energizes the relay turning on the horns. Watch these videos , will explain a little better .
VEHICLE RELAYS Operation Diagnosis
How cars clock spring works

The horn relay is located in the under hood fuse box .

The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

Pull the air bag fuse or disconnect the negative battery cable an wait a few minutes , then you can remove the air bag safely . What country are you from ? Do you have an air bag light lit on the dash as well ? Possible clock spring problem , it's located inside the steering column under the steering wheel . This clock spring allows the steering wheel to turn from right to left keeping the air bag , horn , speed control ( if you have the buttons on the steering wheel ) . Connected electrically . There is also a relay located in a fuse / relay box . Do you know what a relay is ? VEHICLE RELAYS Operation Diagnosis

Four wheel drive vehicles with inside the vehicle four wheel select buttons etc. have plug in four wheel drive control modules, you need to find where yours is located some are under the dash, behind the glove department. others are under the battery box..it can be a DIY job. they are somewhat expensive $ 200 or so..and come in so many modeks..you need to find the exact number of your modual even though you give your vehicle model they vary greatly due to vehicle options...without it your four wheel will not engage....garage cost will be approx $ 400++ so try and find it..Good luck..

all wheel drive vehicles have to work at both ends all the time unless you have a major failure in the drive train. That is why it is called all wheel drive as opposed to 4 wheel drive. With 4 wheel drive you have the option of rear wheel drive or 4 wheel drive and normally in a high ratio or low ratio gear selection. With some all wheel drive vehicles there is a selector that locks the middle diff and creates a 4 wheel drive option without the high/low gear ratio option. So in practice if the both front wheels are in the bog then there is no all wheel drive as the centre diff is working as it should and placing all the action in the rear wheels which will not be turning as they have traction so the front wheels spin faster.. If you have a centre diff lock option ensure that it is operational.

yes theres a fuse inside the vehicle in the fuse panel located on the driver side

It's most likely the "four wheel drive actuator" This is located on the front differential housing. It's cylindrical shaped and has a large hex (about
1-1/4") and two wires coming out of it. Usually they short out and blow the fuse but, I've also seen where they just quit working and sometimes they just get slow to work. The "actuator" has a heating element in it and it warms up, some sort gas, causing it to expand thus engaging the front wheels. In cold weather it may take a minute or so for it to engage, so put in four wheel drive and wait for a bit and see what happens.

Go to the engine compartment where the relays are located with the fuses. Check or replace the 4 wheel auto engage relay , maybe is not working. Is very clearly mark, I believe is the top right one looking at the bost front front of vehicle to the back. There is a diagram drawing of each relay in the cover, so you can't go wrong.

The sound is not coming from the glove compartment, it is coming from the panel behind the drivers seat, that's where the relays and computer are located.
The relays click and apply power to a transfer case motor.
The motor attempts to turn a shaft that engages the front drive shaft.
When the computer thinks the shaft has NOT turned it tries again.
It will try three times then quit, figuring the shaft has not turned.

Get someone to crawl under the vehicle and engage the 4WD (just turn on the ignition- do not start the engine) See if they can hear the motor attempt to turn the shaft, it will make a clicking sound.
If not the connections or the motor may be bad.

I have found the most probable cause is the relays on the control board.
If you are technically adept --
you can remove the small side panel from behind the drivers seat and remove the control board. (remove the power plugs first)
Clean the relay contacts and bend them a little to give them more 'wipe' to keep them clean longer.
Put it back in and turn on the ignition.
Then push the RESET button on the side of the board.
Try the in / out 4WD a couple of times. If it doesn't work turn off the ignition, turn it back on and push the reset button again.