* Window Regulator Problems: This is the most common culprit. The regulator is the mechanism that raises and lowers the window. Over time, the cables can fray, break, or become misaligned. The motor itself can also fail. This often results in the window only going partway up or down, or becoming completely stuck.
* Window Motor Issues: Similar to the regulator, the motor that powers the window can fail. It might be weak, intermittently working, or completely dead.
* Power Supply Problems: Check the fuse for the power windows. A blown fuse will prevent the window from working at all. There might also be a problem with the wiring harness leading to the window motor or regulator. A broken wire or corroded connection can interrupt the power.
* Window Switch Malfunction: The switch itself could be faulty. Try using the driver's side master switch to see if the window operates correctly. If it does, the problem is likely with the passenger's side switch.
* Binding or Obstruction: Something might be obstructing the window's movement. Check for debris, ice, or other objects that might be jamming the window tracks. Inspect the window tracks themselves for damage or misalignment.
* Computer Module Issues (Less Likely): While less probable, a problem with the body control module (BCM) or other electronic control unit could theoretically affect the window operation, although this is usually accompanied by other electrical issues.
Troubleshooting Steps:
1. Check the Fuse: This is the easiest first step. Locate your vehicle's fuse box and check the fuse for the power windows.
2. Test the Switch: Try the window switch on the driver's side and see if that raises the window. This helps determine if the problem lies with the switch or the window mechanism itself.
3. Inspect the Window Tracks: Look for any obstructions or damage to the window tracks.
4. Listen for Sounds: When you try to raise the window, listen carefully. A grinding or clicking sound could indicate a problem with the regulator or motor.
5. Manual Inspection (if safe): If you're comfortable working with car mechanics, you may be able to partially remove the door panel to visually inspect the window regulator and motor for obvious damage. (There are plenty of online guides showing how to do this for a 2002 Tahoe).
If you're not comfortable performing these checks yourself, it's best to take your Tahoe to a mechanic or auto electrician for diagnosis and repair. The problem could be a simple fix (like a blown fuse) or require more extensive work (replacing the regulator or motor).
