ASE A6 Electrical Electronics Practice Test

Power window circuit.

49. The passenger's window in the illustration above is inoperative. It is stuck in the up position. The driver's side window is good. Which of the following is MOST likely causing this condition?

  • A. A faulty relay.
  • B. An open circuit breaker.
  • C. A faulty motor.
  • D. A poor ground.
Power window circuit.

49.

Answer A is wrong. There are no relays in this circuit.

Answer B is wrong. Many window motors have self-resetting circuit breakers. Circuit breakers protect the window circuit from high current.

Answer C is correct. It most likely has a bad window motor. This is common and the MOST likely cause.

Answer D is wrong. The circuit has a common ground that effects both windows.