1. Check the Fuses: Start with the easiest check. Locate your fuse box (usually under the hood or in the passenger compartment) and check the fuses related to the wipers. Replace any blown fuses. If a fuse blows immediately after replacement, there's a short circuit somewhere in the system, and you shouldn't continue until you find and fix it.
2. Inspect the Wiper Linkage: With the wipers off, manually try to move the wiper arms. Are they stiff or seized? Look for any obvious damage, broken parts, or binding in the linkage. If the linkage is jammed, freeing it might be enough to resolve the issue, but be careful not to force anything. Lubricating the linkage (with a silicone-based lubricant) might help, but only if there isn't any significant damage.
3. Examine the Wiper Motor: The wiper motor itself could be faulty. This is more involved and requires some mechanical knowledge. You might hear a clicking or grinding sound when you try to activate the wipers. This often means the motor is failing or is seized. Replacing the wiper motor is usually a fairly straightforward repair, but you'll need to access it under the hood.
4. Check the Wiper Control Module (WCM): This is a more advanced troubleshooting step. The WCM is an electronic control unit that regulates the wipers. A faulty WCM can cause various wiper malfunctions. Testing this requires a multimeter and some electrical knowledge, or a visit to a mechanic. Replacing a WCM can be expensive.
5. Park Position Switch: Some wiper systems have a park position switch that tells the motor where to stop. A problem with this switch could prevent the wipers from parking correctly. Again, this might require a multimeter to diagnose.
Important Considerations:
* Safety First: Disconnect the negative battery terminal before working on any electrical components.
* Repair Manual: A repair manual specific to your 1999 Grand Prix GTP will be invaluable. It will show you diagrams, wiring schematics, and step-by-step instructions for accessing and repairing the wiper system.
* Professional Help: If you're not comfortable working on your car's electrical system or are unsure about diagnosing the problem, take it to a qualified mechanic. Attempting repairs without the proper knowledge can lead to further damage.
In short, there's no simple "reset" button. The problem lies within the wiper system's components, and a systematic check, starting with the fuses and moving towards more complex components, is necessary.
