* Faulty Wiper Control Module: This module is the "brain" that controls the wipers. A malfunction could keep the wipers running even when the ignition is off. This is the most likely culprit given your description.
* Stuck Relay: Relays are electrical switches that control the power to the wipers. A relay that's stuck closed will continuously power the wipers.
* Short Circuit: A short circuit in the wiring harness related to the wipers could also cause them to stay on. This could be from damaged wiring, corrosion, or a connection problem.
* Ignition Switch Problem (Less Likely): While less probable, a faulty ignition switch might not be properly cutting power to the wiper system when the key is turned off.
* Park/Neutral Switch (Automatic Transmission Only): If your Rendezvous has an automatic transmission, a malfunctioning park/neutral switch might prevent the car from fully shutting down electrical components including the wipers.
What to do:
1. Check the fuses: Before diving into more complex issues, check the fuses related to the wipers in your fuse box (usually under the hood or inside the car). A blown fuse might be a symptom of a larger problem, but replacing it might temporarily fix the issue (though it'll likely blow again quickly if there's a short).
2. Don't force anything: Don't try to manually disconnect anything without knowing what you're doing. Improperly disconnecting components could cause further damage or even injury.
3. Seek professional help: This problem is best diagnosed and repaired by a qualified mechanic. They have the tools and expertise to pinpoint the exact cause – whether it's a faulty module, relay, wiring issue, or something else. Explaining the problem precisely as you've done here will help them diagnose it efficiently.
Ignoring the problem could lead to a drained battery, so it's best to address it sooner rather than later. Disconnecting the battery's negative terminal will stop the wipers, but you'll lose all power settings in the car until reconnected.
