Regarding the 4WD switch, you must inspect the two fuses related with it. The first is a 5 ATC fuse 25 amp located in the underhood fuseblock, and the second is a 4WD fuse 48 15 amp located under the left rear seat in the rear fuseblock. Both of these fuses must be inspected to confirm that the 4WD is functioning properly.
If either of these two fuses is defective, it can result in problems with the 4WD switch, such as inability to activate 4WD or trouble shifting 4WD. If the fuses are not the issue, then the switch itself may be at fault.
Prior to attempting a diagnosis, it is essential to identify the symptoms or ailments you are experiencing. This can aid in identifying the root cause and make it simpler to discover a remedy.
The fuse that controls the 4WD switch is the 5 ATC fuse 25 amp located in the underhood fuseblock and the 4WD fuse 48 15 amp located in the rear fuseblock beneath the left rear seat. If you are encountering problems with the 4WD switch, these two fuses are a good place to begin troubleshooting.