1. Check the Obvious:
* Wiper Switch: Ensure the wiper switch is functioning correctly. Try different settings (intermittent, low, high). A faulty switch can prevent proper parking.
* Fuses: Check the fuse(s) related to the wiper motor in the fuse box. A blown fuse will stop the wipers entirely.
* Power to the Motor: With the ignition on, check for power at the motor's electrical connector. You'll need a multimeter to do this safely. If no power, trace the wiring back to the switch and fuse box.
2. Inspect the Linkage:
* Visual Inspection: Carefully examine the wiper linkage. Look for:
* Broken or loose parts: Check for any broken or disconnected linkage arms, springs, or clips. These are common causes of improper parking.
* Binding or rust: Rust or debris can bind the linkage, preventing smooth movement and proper parking. Clean and lubricate any moving parts with a suitable lubricant (like silicone spray).
* Bent or misaligned arms: A bent arm can throw off the parking position. Try to straighten it carefully if possible. If severely bent, replacement may be necessary.
3. Test the Wiper Motor (Advanced):
* Removal: This requires removing the wiper motor from the vehicle. Consult a repair manual for your specific year and model to find the correct procedure. Disconnecting the battery negative terminal is crucial before working on the electrical system.
* External Testing: Once removed, you can try powering the motor directly (with caution!) using a 12V power source and appropriate wiring. Observe its operation. Does it run smoothly in both directions and return to the park position? If not, the motor may be faulty.
* Internal Inspection (If Comfortable): Advanced users might attempt to disassemble the motor to check for internal damage, such as worn brushes or a faulty park switch. This is significantly more complex and risks further damage if not done correctly. Replacement is often easier and more reliable.
4. Park Switch (Most Likely Culprit):
The park switch is a small component inside the wiper motor that signals the motor to stop in the parked position. Often, this switch fails, leading to improper parking. In many cases, replacing the entire wiper motor is more cost-effective than attempting to replace just the park switch.
5. Replacement:
If the above steps don't pinpoint the problem, it's likely the wiper motor needs replacing.
* Parts: Obtain a new wiper motor from a reputable auto parts store. Ensure it's the correct part for your 2000 Pontiac Montana.
* Installation: Again, consult a repair manual for the correct procedure to remove the old motor and install the new one. Proper reassembly of the linkage is critical.
Important Notes:
* Repair Manual: A repair manual specific to your 2000 Pontiac Montana is highly recommended. It will provide detailed diagrams, instructions, and torque specifications.
* Safety: Disconnect the negative battery terminal before working on any electrical components. Always use caution when working with electricity.
* Professional Help: If you're not comfortable working on your vehicle's electrical system or mechanical parts, take it to a qualified mechanic. Improper repair can lead to further damage or injury.
By systematically checking these points, you'll have a better chance of diagnosing and fixing the wiper parking problem on your Pontiac Montana. Remember safety first!
