First, the power window
    The electric windows used in the Jetta sedan are a typical electronic control window glass lift system. Components are as follows: power window lifts, power windows lifter switch, power window relay, power window fuses and connecting wires.
    1. Power window function and principle
    Each of the four doors has a motor, and each motor drives the zipper through the turbine mechanism, which is connected to the gripper on the elevator rail, which drives the glass to move in the guide groove. The zipper jacket is supported on the turbine housing by means of a damping spring so that the impact of the upper and lower stops can be reduced by the cushioning of the spring.
    (1) commutator commutation: the window lifter close to the point, the first to overcome the spring tension, this time the motor current increases, heating the motor in the bimetal switch, when reaching the point, the current further increased until Bimetal further deformation and even interrupt the power supply, to achieve a stop. When the reverse start with the opposite, to the point of power.
    (2) Circuit connection sequence: battery positive pole → central relay box → plug Y3 → additional insurance two → electric door and window relay → window lift switch → window lift motor (including positive, reverse, stop) → ground Point in the central relay box on the left side of the body).
    Control: left front door has two switches, respectively, control the two front doors; the remaining three doors were controlled by the respective switch.
    2. Inspection and repair and precautions
    (1) due to the power window and the central door locks, electric antenna common ground wire, and produce a typical failure: the central door lock is not easy to use. Switch the window when the radio, lift indicator lights and other low-power appliances work, the result is the point of the ground is not connected to each other due to unreasonable.
    (2) disassembly of the power window must pay attention to the correct installation location, all of its bolt connection hole for the oval hole, positioning the front window movements must not interfere.
    (3) the door size accuracy will seriously affect the life of the window lifter motor. Because the guide groove is mounted on the door, the lifter moves in the guide groove again.
    (4) door sealing and dust is particularly important: the door inside the board has a layer of plastic protective layer, the damage will lead to dust into the door, the serious interference will be the movement of the power window.
    Second, the central door lock
    1. Central door locks a wide range of its structure and function vary
    (1) independent central door locks, such as Jetta, golf and so on. This kind of central door lock structure is simple and easy to detect and repair, the disadvantage is the function is more single. To compensate for this, FAW - Volkswagen and Siemens jointly developed a security stop, as an option to the user.
    (2) with anti-theft devices and remote control starting device central door locks, such as the Audi A6 and so on. The kind of central door locks both a variety of functions, easy to use, but the cost of higher maintenance more trouble.