Question

13.1 the driver of a vehicle complains of intermittent power window operation. which of the following could be the cause?
ca. a blown fuse
cb. a stuck closed relay
cc. worn switch contacts
cd. high resistance in a connector
copyright © the national institute for automotive service

Explanation:

Step1: Analyze each option

• Option A: A blown fuse would cause the power window to not operate at all, not intermittent operation.
• Option B: A stuck - closed relay would cause the window to be stuck in one position (either up or down), not intermittent operation.
• Option C: Worn switch contacts can cause intermittent electrical connection. When the contacts are worn, sometimes they make a good connection (window works) and sometimes they don't (window doesn't work), leading to intermittent power window operation.
• Option D: High resistance in a connector can cause voltage drop. But high resistance usually leads to a more consistent problem (like slow operation or no operation due to insufficient voltage), rather than intermittent operation.

Answer:

C. Worn switch contacts