1. Identify the Problem:
* Wiper not moving at all: This could be a blown fuse, a bad motor, a faulty switch, or a wiring problem.
* Wiper moving erratically or intermittently: This suggests a problem with the motor, wiring, or the wiper arm mechanism itself.
* Wiper blade streaking or not cleaning properly: This is usually a problem with the wiper blade itself, requiring replacement.
2. Troubleshooting Steps:
* Check the Fuse: Consult your owner's manual to locate the rear wiper fuse. Replace it if blown.
* Inspect the Wiper Motor: This is often located under the rear cargo area. Access it (you might need to remove some trim panels). Visually inspect it for damage or obstructions. You might be able to hear it trying to work – a clicking sound might indicate a problem within the motor itself.
* Check the Wiper Switch: See if the switch itself is faulty. Try using the switch repeatedly to see if it is sticky or unresponsive.
* Examine the Wiper Arm and Linkage: Look for any damage, looseness, or binding in the arm or the linkage connecting the arm to the motor. Make sure the arm is properly seated on the wiper shaft.
* Test the Wiring: Carefully check the wiring harness leading to the motor for any visible damage, loose connections, or corrosion. A multimeter can help check for continuity if you're comfortable with electrical testing.
* Inspect the Wiper Blade: Replace the wiper blade if it's worn, cracked, or leaving streaks. Sometimes cleaning the blade can help if it's just dirty.
3. Repair or Replacement:
* Fuse Replacement: The easiest fix. Replace the fuse with one of the same amperage.
* Wiper Blade Replacement: Relatively inexpensive and straightforward. Buy a replacement blade that's compatible with your Tahoe.
* Wiper Motor Replacement: More challenging, requiring removal of the motor and replacement. You may need to source a replacement motor from a parts store (providing the year, make, and model of your Tahoe). This could involve electrical connections.
* Wiper Arm and Linkage Repair: Could involve tightening loose bolts, replacing worn parts, or possibly replacing the entire linkage assembly.
* Wiring Repair: If you find damaged wiring, you might be able to repair it by soldering and insulating the connection or replacing the damaged section of wire. However, this requires electrical knowledge and tools.
* Wiper Switch Replacement: This requires some disassembly to access the switch but is relatively straightforward if you're comfortable with vehicle interior work.
Important Considerations:
* Safety First: Disconnect the negative battery terminal before working with any electrical components.
* Owner's Manual: Your owner's manual is an invaluable resource for diagrams, fuse locations, and troubleshooting guides specific to your 2004 Tahoe.
* Professional Help: If you're not comfortable working on your vehicle's electrical system or mechanical components, it's best to take it to a qualified mechanic. Incorrect repairs can lead to further damage.
By systematically checking each component, you should be able to identify the cause of your rear wiper malfunction and implement the necessary repair. Remember to always prioritize safety and consult your owner's manual for specific instructions and diagrams.
