1. Test the Switch:
* Check other windows: Try using the driver's side window switch to operate the *passenger* side windows. If those work, the switch itself is likely the problem. If the passenger windows also don't work from the driver's side, the problem might be with the main window control module (this is less likely than a bad switch).
* Passenger-side switch: Try rolling down the driver's window using the passenger-side window switch. If it works, the problem is definitely the driver's side switch.
* Listen Carefully: When you press the switch, do you hear *any* clicking sound at all? A faint click might indicate a weak switch that still has some life, while the absence of any sound is a stronger indicator of failure.
2. Test the Window Motor (requires some disassembly):
This requires accessing the window motor. It's usually located within the door panel. You'll need to remove the door panel to do this. Search online for a guide specific to your 2001 Suburban, as this varies by model year. Be careful not to damage any clips during removal.
Once the panel is removed:
* Visual Inspection: Check the motor and regulator for any obvious signs of damage, like broken wires, melted components, or physical obstructions.
* Direct Power Test (Caution!): This is the most effective but potentially risky test. Disconnect the battery's negative terminal before proceeding. You'll need a multimeter or a test light and some jumper wires.
* Locate the motor connector: Identify the wiring harness connector that goes to the window motor.
* Apply 12V directly: With the multimeter, carefully apply 12V to the motor's power leads. The polarity is critical; get it wrong and you could damage the motor. Use the wiring diagram (available online) to find the positive and negative wires for the motor. *If you're not comfortable with this step, skip it.*
* Observe the motor: If the motor runs when you apply 12V, the motor is fine and the problem lies with the switch or wiring. If it doesn't run, the motor may be faulty.
3. Check the Wiring:
While you have the door panel off, visually inspect the wiring harness for any broken, frayed, or corroded wires between the switch and the motor.
Troubleshooting Summary:
* Switch is bad: If the other windows work from the driver's switch, and the driver's window works from the passenger's switch, it's almost certainly the driver's window switch.
* Motor is bad: If you apply 12V directly and the motor doesn't run, the motor is likely faulty.
* Wiring issue: Broken or corroded wires anywhere in the circuit will prevent the window from working.
Important Notes:
* Safety First: Always disconnect the negative battery terminal before working with electrical components in your vehicle.
* Wiring Diagrams: Finding a wiring diagram specific to your 2001 Suburban is highly recommended. These diagrams will help you correctly identify the wires and their functions. You can often find these online through automotive repair websites or forums.
* Professional Help: If you're not comfortable with electrical work or taking apart your car door, it's best to take your Suburban to a qualified mechanic. Incorrectly diagnosing or repairing the problem could lead to further damage.
By following these steps, you should be able to narrow down the cause of the problem and determine whether to replace the switch, the motor, or address a wiring issue. Remember safety and caution are paramount when working with car electrical systems.
