ASE A6 Electrical Electronics Practice Test

Power window circuit.

34. 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 LEAST likely causing this condition?

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


Answer A is correct. There are no relays in this circuit. It does contain a circuit breaker, two motors and a ground.

Answer B is wrong. An open in the circuit breaker would affect both motors, but there is no relay in the diagram.

Answer C is wrong. It could have a bad window motor. This is the most likely cause.

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