1. Check the Fuses: Before diving into more complex components, always start with the simplest. Check the fuse(s) related to the windshield wipers in your Chevy Venture's fuse box (usually under the hood or in the interior). A blown fuse would prevent the wipers from working at all or intermittently, but it's worth ruling out.
2. Test the Wiper Motor Directly (Advanced): This step requires some electrical knowledge and a multimeter. With the ignition OFF, disconnect the electrical connector from the wiper motor. Using your multimeter, carefully check the resistance of the motor windings. A shorted winding could cause the motor to run at full speed regardless of the switch position. If you're not comfortable with this, skip to the next step.
3. Examine the Wiring Harness: Carefully inspect the wiring harness connecting the wiper switch to the wiper motor for any damage (breaks, fraying, corrosion). Pay close attention to the connector at the motor itself. A broken wire or a poor connection could be sending a constant high-speed signal. Wiggling the harness gently while the wipers are on might reveal a loose connection causing intermittent high speed.
4. Investigate the Wiper Motor Control Module (if equipped): Many vehicles, particularly those from this era, might not have a dedicated control module for the wipers. However, some did. The control module acts as an intermediary between the switch and the motor. If your Venture has one, it's a strong suspect. Locating the module requires consulting your vehicle's wiring diagram or a repair manual. Unfortunately, these are often difficult and expensive to replace.
5. Consider a Stuck Relay: While less likely than a control module issue, a stuck wiper relay could cause this problem. A relay acts as a switch controlled by the control module or switch. A faulty relay might stay permanently closed, sending power continuously to the motor. Locating and testing the relay (often found in the under-hood fuse box) might be easier than the module. Again, a wiring diagram is very helpful here.
6. Ground Connection: A poor ground connection can lead to erratic behavior. Trace the ground wire from the wiper motor and ensure it's securely connected to a clean, grounded surface.
7. Replacement Options:
* Wiper Motor: If the motor itself is faulty (as determined in step 2), it's the most straightforward replacement. However, given the symptom, this is less likely.
* Wiper Motor Control Module (if equipped): This is often expensive. Used parts are a possibility.
* Entire wiper switch assembly: A last resort, especially since you say the detents are working, this is less probable but still possible.
Important Notes:
* Safety First: Disconnect the battery's negative terminal before working on any electrical components to prevent shorts or injury.
* Wiring Diagrams: A wiring diagram specific to your 2000 Chevy Venture is invaluable. You can usually find them online (though they might cost a small fee) or in a repair manual.
* Professional Help: If you're not comfortable working with car electrical systems, it's best to take your Venture to a qualified mechanic.
Start with the simpler checks (fuses, wiring inspection) and work your way up. If you can determine whether your Venture has a dedicated wiper control module, that will narrow down the search. Remember to always consult your vehicle's service manual for the specifics.
