* Blown Fuse: This is the *first* thing to check. Your owner's manual will show you the fuse box locations (usually under the hood and sometimes in the cabin) and which fuse(s) control the liftgate's power. Check for blown fuses related to the liftgate, power locks, and potentially windows (though window fuses are usually separate).
* Faulty Liftgate Switch: The switch on the liftgate itself could be malfunctioning. If it's broken internally, it might not be sending power to the locks, wiper, or window.
* Wiring Harness Issues: The wiring harness running to the liftgate is prone to damage from constant flexing as the gate opens and closes. Wires can become frayed, broken, or corroded, interrupting the electrical signals. Inspect the harness carefully for any visible damage, especially near the hinges and where the wiring enters the vehicle body.
* Liftgate Control Module (if equipped): Some vehicles have a dedicated control module for the liftgate. A faulty module could be preventing power from reaching the components. This is less likely than the other options, but possible.
* Grounding Problem: A poor ground connection in the liftgate's electrical system could prevent proper operation of the components. A corroded or loose ground wire can disrupt the flow of electricity.
* Power Lock Actuator Failure (for locks only): While less likely to affect the wiper and window, a faulty power lock actuator in the liftgate could be a separate issue causing only the locks to malfunction.
Troubleshooting Steps:
1. Check the fuses: This is the easiest and quickest check.
2. Visually inspect the wiring harness: Look for any obvious damage, breaks, or corrosion.
3. Test the liftgate switch: See if you can get any response from the switch itself.
4. Check the ground connection: Trace the ground wire from the liftgate and ensure it's securely connected and free of corrosion.
If you've checked these items and the problem persists, it's best to consult a qualified auto electrician or Toyota mechanic. They have the tools and expertise to diagnose the more complex electrical issues. Trying to troubleshoot advanced electrical problems without the proper knowledge and equipment can lead to further damage.
