The 2006 mileage of TOYOTA, km, runs 172 thousand miles. User response: the electric door can not be opened remotely. Failure analysis: first, failure occurs. When the door is opened with the remote control, the door action can not be opened. It is doubted that the door sliding rail is stuck, and the slide rail is removed after cleaning. When the left door is opened with the remote control, it is found that when the left door is opened with the remote control, a lock can not be unraveled at the bottom of the remote control. When the door is pulled with the hand, the lock will open smoothly. The inner lining of the door is removed and the lock is controlled by two cables, of which one is electrically operated on the door of the car. When the machine is controlled, it is found that when the remote control is unlocked, the motor is unlocked and the voltage applied to the motor is measured. The voltage is 12V when the remote control is opened, so the motor is removed and the battery is driven directly. The motor is found to have no action, indicating the damage of the electric machine. Troubleshooting: replacement of unlocking control motor, troubleshooting. Failure revelation: Although this fault has been excluded, but a lot of detours, in the future work to look at the maintenance manual, make clear the principle of work, trouble solving half work times. Failure comment: careful observation, inspection, and proper use of maintenance information, this is a prerequisite for good maintenance work.