How to Replace a Broken Transfer Case Switch
One of the parts that differentiate four-wheel drive vehicles from their two-wheel drive counterparts is the transfer case. Found at the bottom of four-wheel drive and all-wheel drive vehicles, the transfer case engages and disengages the four-wheel drive capability of the car. The transfer case is controlled via the transfer case switch, and if the switch malfunctions you won't be able to shift your car into four-wheel drive. A broken transfer case switch might cause the service 4WD message in your vehicle's dashboard to light up, but if you are having difficulty getting your transmission to shift to four-wheel drive then you need to get the transfer case and transfer case switch inspected and replaced if needed.
Difficulty level: Moderate
Step 1: Using the jack, raise the rear end of your vehicle. Slide the jack stands under the rear frame and lower the vehicle in place.
Step 2: Pop open the hood and detach the negative battery cable using your socket wrench.
Step 3: Go to the rear end of your vehicle and look for the transfer box. You can check your car's user manual to find out where the transfer box is located.
Step 4: Remove the electrical connections, shift lever, and vacuum lines that connect to the transfer case.
Step 5: Carefully remove the bolts that hold the transfer box in place. Once the bolts are removed, you should now be able to gain access to the transfer case switch.
Step 6: Unplug the wiring harness from the back of the switch. Once the harness is detached, carefully pull the switch out.
Step 7: Attach the new switch onto the transfer box and reattach the harness.
Step 8: Replace and tighten the bolts on the transfer box. Reattach the electrical connections, vacuum lines and shift lever and the battery cable.
Step 9: Lower and remove the jack stands from the rear of the vehicle and start the engine. Check if the transfer case switch is working properly.