* Wiper Motor: The motor itself might be failing. This could manifest as slow speeds, jerky operation, or complete failure at random times. Internal wear, brush problems, or seized components are common reasons for motor failure.
* Wiper Switch (Multi-Function Switch): This switch controls the various wiper speeds and functions. Internal wear and tear, especially from age, can lead to inconsistent operation or complete failure of certain speeds or functions. It's a relatively common failure point in older vehicles.
* Wiper Switch Wiring: Corrosion, broken wires, or loose connections in the wiring harness leading to and from the wiper switch are a frequent problem. Vibration and age can cause these issues. Check the connections at the switch and where the harness plugs into the motor.
* Wiper Linkage: The mechanical linkage connecting the motor to the wiper arms can become worn, rusted, or otherwise bind. This often results in intermittent operation, skipping, or uneven wiper movement. Check for rust, binding, and broken parts.
* Fuse: A blown fuse is a simpler fix, but it's worth checking. Consult your owner's manual to locate the fuse for the wipers.
* Relay: A relay controls the power to the wiper motor. A faulty relay can cause erratic operation. These are relatively inexpensive to replace.
* Park Position Sensor (if applicable): Some systems use a sensor to detect the wiper's parked position. A faulty sensor might prevent the wipers from operating correctly. This is less likely but worth considering.
* Ground Connections: Poor ground connections can cause all sorts of electrical gremlins. Check all ground connections related to the wiper system for corrosion or looseness.
Troubleshooting Steps:
1. Check the Fuse: This is the easiest first step.
2. Inspect the Wiper Linkage: Look for rust, damage, and binding. Manually operate the linkage to see if it moves freely.
3. Test the Wiper Switch: Try all the different wiper speeds and settings. If certain positions don't work, the switch is a likely suspect.
4. Listen for the Motor: When you turn on the wipers, do you hear the motor running (even weakly)? If not, the motor, relay, or wiring is likely at fault.
5. Check Wiring and Connections: Inspect the wiring harness for breaks, corrosion, and loose connections.
6. Use a Test Light or Multimeter: If you're comfortable with basic electrical testing, use a test light or multimeter to check for power at the motor and switch. This will help isolate the fault.
If you're not comfortable working on car electrical systems, it's best to take your Cheyenne to a mechanic for diagnosis and repair. Attempting repairs without proper knowledge could lead to further damage or injury.
