4 Wheel Drive doesn't Work?

Check AC/HTR fuse first. Check for feed wire problem at transfer case switch, possible open. Also inspect wires to actuator, and inspect actuator for damage.

See the guide below on testing wiring

https://www.2carpros.com/articles/how-to-check-wiring

Wiring diagram for your 4wd system is attached below

Hi,

First, check the 4wd fuse to make sure it is good. In addition to just checking the fuse, make sure there is power to it. If that is good, there is a black wire coming from the actuator on the axle. Make sure it has continuity to ground.

I attached a pic below of the fuse and a portion of the wiring schematic. Here is a link you may find helpful when testing for power at the fuse:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know. Also, if the fuse is good, I need to know if the 4wd light is turning on and if there is power to the actuator.

Take care,
Joe

Do you mean the actuator is working fine or everything is working fine?

Hi,

Check to see if there is power to the front axle solenoid switch. I attached a pic for you. You should have 12v to blue wire.

Let me know.
Joe

Hello,

It sounds like something broke. Can you confirm the front driveshaft turns? Here is an exploded view of the transfer case. Check the encoder it might not be working right. If everything looks okay here is how you rebuild the transfer case the instruction and diagrams are below. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Can you remove the driveshaft to see if the transfer case still works? Here is a guide to help:

https://www.2carpros.com/articles/how-to-remove-a-drive-shaft

Please run down this guide and report back.

Yep, it sounds like something let go inside the transfer case, it will need to be removed and disassembled. Use the diagrams above to help take it apart to see what happened. Please upload pictures of the damaged parts once you get it apart. We are interested to see what it is.

Hi,

I attached a portion of the wiring schematic. Are you getting power to the dark blue wire and not the light blue?

Have you checked the switch itself? If you look at pics 2 and 3, I provided the schematic for the system. If you look, power is provided via a brown wire to the transfer case switch. From there, low or high 4wd is determined. If low works, then we know power is available to the switch. If it isn't changing out of 4 low, confirm the fuse is good (indicated in pic) and power is to the switch. If you have power and 4low works properly when in 4wd, the I suspect the switch is bad.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this helps or if you have other questions.

Take care,
Joe

Check to see if there is power to the 4wd actuator on the transfer case (if it is the electric shift). If it has the lever on the floor, check the linkage to the transfer case. If it is good, tight, and properly adjusted, check to make sure the actuator on the front axle is working. There is an updated actuator for these, the originals had issues

See diagram below

Check both switches in pic for power they are both on front axle. But normally only one wheel spins anyhow unless it's positraction