* Burnt-out wiper motor: This is the most common cause. Over time, motors wear out, especially if subjected to strain (like freezing or forcing the wiper). The motor may simply be seized or have internal components that have failed.
* Blown fuse: Check your owner's manual for the location and rating of the rear wiper fuse. A blown fuse is a relatively easy and inexpensive fix.
* Faulty wiper motor switch: The switch itself might be malfunctioning, preventing power from reaching the motor. This is less common than a blown fuse or a bad motor.
* Wiring problems: A break or short in the wiring between the switch, fuse, and motor could interrupt the circuit. This might involve corroded connections, damaged wires in the harness, or a problem with the connector at the motor. This is often less likely than a failed motor but is more difficult to diagnose and repair.
* Parked wiper arm: In some vehicles, a stuck or improperly parked wiper arm can put strain on the motor and prevent it from working, although this is less common than the other possibilities.
* Relay failure (less likely): While less common, a failed relay specific to the rear wiper could also be the cause. Relays act as switches and protect the motor circuit.
Troubleshooting Steps:
1. Check the fuse: This is the easiest first step. Replace it if blown.
2. Inspect the wiring: Look for any visible damage to the wiring harness leading to the motor.
3. Test the switch: If possible, try accessing the wiring at the switch and testing for power with a multimeter (requires some electrical knowledge).
4. Check the wiper motor itself: This might require removing the motor to visually inspect it for any obvious damage or to test its operation with a direct power source (proceed with caution, and only if you have electrical experience).
5. Listen for any clicking sounds: When you try to activate the wiper, listen carefully for any clicking sounds from the motor or relay, indicating a potential power issue but a non-functional motor.
If you're not comfortable working with car electronics, it's best to take your Jeep to a mechanic for diagnosis and repair. Replacing the wiper motor is often the most straightforward solution if the other components are found to be working correctly.
