* Wiring/Connectors: A common culprit. Corrosion, loose connections, or broken wires between the switch, the wiper motor, and the Body Control Module (BCM) can interrupt the signal needed for the delay function. Carefully inspect all wiring and connectors in this circuit for damage. Pay close attention to any connectors near the steering column and under the hood near the wiper motor.
* Body Control Module (BCM): The BCM is the "brain" controlling many electrical functions, including the wiper delay. A faulty BCM can prevent the delay from working correctly, even with new components. This requires diagnostics, often with a scan tool capable of reading BCM codes.
* Clock Spring: The clock spring is a spiral cable that connects the steering wheel to the airbag and other steering column components, including the wiper switch. If the clock spring is damaged or failing, it can disrupt the electrical connection to the wiper switch, affecting the delay function.
* Fuse/Relay: Though less likely with new parts, there could still be a blown fuse or a faulty relay related to the wiper system. Check your owner's manual for the correct fuses and relays and test them accordingly.
* Ground Connection: A poor ground connection anywhere in the wiper circuit can cause intermittent or complete failure of the delay. Inspect ground wires for corrosion or looseness.
* Incorrect Installation: While less probable if you had a professional install the new switch and motor, it's possible there was an error in the installation preventing proper functioning. Double-check all connections.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine all wiring and connectors related to the wiper system. Look for any signs of damage, corrosion, or loose connections.
2. Fuse and Relay Check: Check the fuses and relays associated with the wipers as per your owner's manual.
3. Ground Connection Check: Inspect all ground connections for corrosion or looseness.
4. Scan Tool Diagnosis: If you have access to a scan tool that can read BCM codes, have it check for any wiper-related diagnostic trouble codes (DTCs). This is the most definitive way to determine if the BCM is at fault.
5. Professional Diagnostic: If you've checked all the above and the problem persists, it's best to take your vehicle to a qualified mechanic. They have the tools and expertise to properly diagnose the issue and repair it efficiently. Mention the new switch and motor to save time.
Don't overlook the seemingly simple things. Often, a loose connection or corroded wire is the root cause of electrical problems. A systematic approach to checking each component will significantly increase your chances of finding the culprit.
