Central door locking system
1. The electric door lock system actuates the locking actuators for all vehicle doors. The system consists of switches, actuators and associated electrical wiring. Typically, the diagnostic procedure is limited to checking wiring connections and actuators, minor damage to which can be easily repaired.
2. Door locks are actuated by actuators - double-acting electromagnets or electric motors located in the doors. The lock switches have two positions: OPEN and CLOSED. Later models of cars also have a remote control system that allows you to open and close the doors from outside the car. Depending on the position of the switch, the polarity of the connection changes, allowing the actuators to operate in two directions, opening or closing the door lock. In early models, the switch directly turned on the electromagnets or electric motors of the door opening actuators.
3. If the following checks fail to find and eliminate the cause of the problem. contact a specialized service station.
4. Check the fuse first. In the Probe model, power is supplied to the central locking system through fuses 3, 2 and 11 located in the fuse box located in the passenger compartment on the driver's side. On a Mazda model, check the door lock fuse (30 A) and interior lighting fuse (15 A).
5. With the engine off, close and open the door locks. You should hear a click when each door relay is activated.
6. If there is no click, check for voltage at the door lock switch. If there is no voltage, check the wiring between the fuse and the switch.
7. If there is voltage, but there are no clicks. check for contact between the switch terminals in the on and off positions. If the switch is defective, replace it.
8. If there is a contact in the switch, but the actuator does not work, check the wiring between the switch and the actuator. Repair wiring problem.
9. If only one actuator does not work, remove the door lining and protective coating (see chapter 11) and check for voltage at the actuator terminals when the drive is turned on (pic. 25.9). One of the terminals should have positive voltage when the door is closed, on the other - when it is opened.
10. If voltage is present, but the actuator does not work, replace it.
Note: Most often, a malfunction occurs in the wiring between the car body and the door (these wires bend every time you open and close the door).
Remote control system
11. The remote control system consists of a transmitter that transmits a coded infrared signal to a receiver that controls the opening and closing of the door locks.
12. It is necessary to periodically replace the batteries in the transmitter. The batteries need to be replaced if the red LED on the side of the transmitter housing does not light up when pressing the transmitter button.
13. Using a small screwdriver, carefully pry the halves of the transmitter housing apart (pic. 25.13).
14. Install new CR2025 lithium batteries (fig.25.14).
15. Squeeze the halves of the transmitter body together.