Central door locking system
1. The electric door locking system operates the actuators for locking all vehicle doors. The system consists of switches, actuators and associated electrical wiring. Typically, the diagnostic procedure is limited to checking the electrical wiring connections and actuators, minor damage to which can be easily repaired.
2. Door locks are operated by actuators - double-acting electromagnets or electric motors located in the doors. The door lock switches have two positions: OPEN and CLOSED. Later model cars also feature 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 activated the electromagnets or electric motors of the door opening actuators.
3. If you are unable to find and eliminate the cause of the malfunction after performing the following checks. contact a specialized service station.
4. First, check that the fuse is working properly. In the Probe model, voltage is supplied to the central locking system via fuses 3, 2 and 11, located in the fuse box installed in the passenger compartment on the driver's side of the car. On Mazda models, check the door lock fuse (30 A) and the interior light fuse (15 A).
5. With the engine off, close and unlock the doors. 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 faulty, 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. Fix the electrical wiring problem.
9. If only one actuator does not work, remove the door trim and protective covering (see chapter 11) and check for voltage at the actuator terminals when the drive is turned on (figure 25.9). There should be positive voltage on one of the terminals when the door is closed, and on the other when it is opened.
10. If voltage is present, but the actuator does not work, replace it.
Note: Most often, faults occur in the electrical wiring between the car body and the door (these wires bend every time the door is opened and closed).
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 located on the side of the transmitter housing does not light up when you press the transmitter button.
13. Using a small screwdriver, carefully separate the halves of the transmitter housing (figure 25.13).
14. Install new CR2025 lithium batteries (figure 25.14).
15. Press the transmitter housing halves together.