1. Check the Switch First (Most Likely Culprit):
* Visual Inspection: Remove the switch from the steering column. This usually involves removing a trim piece around the steering column and then carefully unplugging the switch connector. Inspect the switch for any obvious damage, burnt contacts, or anything out of place. A careful examination with a magnifying glass might reveal tiny broken pieces within the switch mechanism. Do NOT attempt to disassemble the switch unless you're comfortable with very fine electronics repair, as it's very easy to damage it beyond repair.
* Testing (Advanced): If you have a multimeter, you can test the continuity of the switch contacts in different positions. You'll need a wiring diagram for your Riviera to identify the correct wires to test. This requires a good understanding of electrical circuits. Incorrect testing can cause further damage.
2. Check the Wiring:
* Connector Inspection: Carefully examine the connector that plugs into the switch. Look for any corrosion, bent pins, or broken wires. Clean any corrosion with contact cleaner (specifically designed for electronics).
* Wiring Harness Inspection: Follow the wiring harness from the switch to its destination (likely the Body Control Module or a fuse box). Look for any damaged or frayed wires. This might require removing some trim panels.
* Ground Check (Important): A poor ground connection can cause all sorts of electrical gremlins. Make sure the ground points for the wiper system are clean and secure.
3. Body Control Module (BCM) (Less Likely):
The BCM (or similar control module) interprets signals from the switch and controls the wipers. A faulty BCM can cause the wipers to malfunction in various ways, including staying on. This is a less likely culprit but should be considered if the switch and wiring checks are negative. Replacing the BCM is a more involved task, usually requiring a professional.
4. Replacing the Switch:
If you find any damage to the switch or connector, replacement is the best course of action. You'll need to:
* Obtain a replacement switch: Find a new or used switch from a reputable parts supplier (auto parts stores, online retailers specializing in GM parts). Ensure it's the correct part number for your 1995 Buick Riviera.
* Installation: Reverse the removal process to install the new switch. Make sure the connector is securely plugged in.
Important Notes:
* Disconnect the negative battery terminal before working on any electrical components to prevent short circuits.
* Refer to a repair manual: A factory service manual for your 1995 Buick Riviera will provide detailed diagrams and instructions for removing the switch, inspecting the wiring, and troubleshooting the system. This is highly recommended.
* Safety First: If you're not comfortable working with car electronics, take your Riviera to a qualified auto electrician or mechanic.
Replacing the switch is the most likely solution, but a thorough inspection of the wiring and connector is crucial to avoid a repeat of the problem. Without a wiring diagram and some electrical testing knowledge, replacing the switch is the simplest and safest option to try first.
