1. Check the Fuse: A blown fuse is the most common cause of wiper malfunction. Consult your owner's manual to locate the fuse box (usually under the hood or under the dash) and find the fuse responsible for the wipers. Replace it with a fuse of the same amperage.
2. Wiper Switch: The wiper switch itself can fail. Try all the wiper settings (intermittent, low, high, wash). If none work, the switch may be faulty and need replacement.
3. Wiper Motor: The wiper motor can fail, seize, or become worn. This often results in no movement or intermittent, jerky operation. Accessing the motor usually requires removing some under-hood components (check a repair manual for your specific year and model Tahoe). You might be able to hear a clicking sound from the motor if it's failing to engage.
4. Wiper Linkage: The linkage connecting the motor to the wiper arms can become rusty, stiff, or broken. This can cause erratic movement or complete failure. Inspect the linkage for any obvious problems. Lubricating moving parts might help, but if parts are broken they will need replacing.
5. Wiper Arms and Blades: Frozen or severely worn wiper blades can strain the motor. Try replacing the blades. If the arms are bent or damaged, they'll need to be replaced or straightened.
6. Multi-Function Switch: Some models might have this issue linked to a multi-function switch (often including turn signals and headlights). It's less common but is possible.
7. Low Washer Fluid: If you're trying to use the washer fluid and the wipers aren't working, ensure you have adequate washer fluid in the reservoir. A lack of fluid can sometimes trigger a safety mechanism that stops the wipers from working.
8. Wiring and Connections: Check the wiring harness connecting the switch, motor, and other components for any broken wires, loose connections, or corrosion. This can often be a tough area to diagnose without a wiring diagram.
Troubleshooting Steps:
1. Start with the simplest checks: Fuse, then wiper blades.
2. Listen for sounds: A clicking sound from the motor area points to a motor problem. Grinding sounds indicate linkage issues.
3. Visual inspection: Look for obvious problems with the linkage, wiring, and wiper arms.
4. Test the switch: Try all positions of the wiper switch.
5. Consult a repair manual: A repair manual specific to your 2002 Tahoe will provide detailed diagrams and instructions for troubleshooting and repair.
6. Professional help: If you're not comfortable working on your vehicle yourself, take it to a qualified mechanic.
Remember safety first! Disconnect the battery's negative terminal before working on any electrical components.
