When your 2020 Jeep Grand Cherokee's windshield wipers won't operate, rain driving becomes dangerous and illegal in many states. The wiper system has several potential failure points worth investigating.
Wiper Motor Failure
The wiper motor powers the wipers. Motor failure can be complete (no movement) or partial (slow movement, stopping mid-sweep). Burned-out motors make no sound; seized motors may make a humming or clicking sound when the switch is activated.
Wiper Linkage
The linkage connects the motor to the wiper arms. Linkage can disconnect, bind, or break. If you hear the motor running but wipers don't move, the linkage has likely failed. This is often visible when you observe the wiper area with the hood open.
Multi-Function Switch
The wiper control stalk (multi-function switch) commands wiper operation. Worn contacts inside the switch prevent signal transmission. If wipers don't respond to the switch but the motor tests good, the switch is suspect.
Fuse and Relay
Wiper systems are fuse and relay protected. A blown fuse causes immediate failure. The relay may fail preventing power from reaching the motor. Check both in the fuse box.
Park Switch Issues
Wipers return to the park position when turned off via a park switch in the motor. A faulty park switch can leave wipers stuck mid-sweep or prevent them from running at all.
Rain-Sensing System
If equipped with rain-sensing wipers, the sensor module can fail causing automatic wiper issues. Manual wiper operation may work while automatic mode doesn't, indicating sensor rather than motor problems.