1. Check the Fuse:
* Locate the fuse box: Consult your owner's manual to find the location of the interior fuse box. It's likely under the dash or in the engine compartment.
* Identify the rear window fuse: The owner's manual should list the fuse for the rear window defroster/power window system.
* Inspect the fuse: Look for a blown fuse (a broken filament inside the fuse). If blown, replace it with a fuse of the same amperage.
2. Check the Circuit Breaker (if applicable): Some vehicles use a circuit breaker instead of, or in addition to, a fuse. Check your owner's manual.
3. Inspect the Wiring:
* Access the wiring harness: This will likely require partial disassembly of the rear interior trim around the window. Be careful not to damage any components during disassembly.
* Visually inspect the wires: Look for any frayed, broken, or corroded wires connecting to the motor, switch, and regulator. Pay particular attention to areas that bend or flex frequently.
* Test for continuity (optional): If you have a multimeter, you can test the continuity of the wires to ensure the circuit is complete. However, this requires some electrical knowledge.
4. Check the Window Switch:
* Try the switch repeatedly: Sometimes, the switch itself can get stuck or become faulty. Try pressing and holding the switch in both directions several times.
* Try the switch with the ignition on and off: Some systems need the ignition to be on to function, while others are always powered.
* Test the switch (optional): If you're comfortable with basic electrical testing, you can use a multimeter to test if the switch is sending power when activated.
5. Check the Motor:
* Listen for sounds: With the switch activated, listen carefully for any clicking, humming, or grinding sounds coming from the rear window motor. These sounds can indicate the motor is malfunctioning or something is binding.
* Manually try to move the window: If you can access the motor, try to manually move the window up and down. Resistance could indicate a mechanical problem within the mechanism. This is usually a difficult task to accomplish and may require more disassembly.
6. Check the Regulator:
* The regulator is the mechanism that guides the window up and down. If the motor is working but the window won't move, the regulator might be broken or jammed. This is usually the most difficult part to check and often requires significant disassembly.
7. Inspect the Window for Obstructions:
* Check if anything is blocking the window's path, such as debris or ice.
Important Considerations:
* Safety First: Always disconnect the negative battery terminal before working on any electrical components.
* Repair Manuals: A repair manual specific to your 1996 Ford Bronco will be extremely helpful in providing detailed diagrams and instructions for disassembly and repair. You can find these online or at auto parts stores.
* Complexity: Repairing the rear window mechanism can be quite involved, requiring specialized tools and knowledge. If you're not comfortable with automotive repair, taking it to a professional mechanic is advisable to avoid further damage.
If you've checked all of the above and the window still doesn't work, it's highly likely you'll need professional help. The problem could be a faulty motor, a broken regulator, a more extensive wiring issue, or even a problem with the window itself.
