The central locking system controls all vehicle door locks. The system consists of door lock drives, switches and connecting wires. When diagnosing and repairing, it is usually limited to checking all wires and drives, identifying faults and eliminating them.
Instructions
Step 1
The central locking uses two-way solenoids to lock and unlock the doors. The switches have two positions: "closed" (closed) and "open" (open). The switches activate a relay that sends voltage to the door lock solenoids. Depending on the signal being sent, the relay changes its polarity to positive or negative voltage on both parts of the circuit.
Step 2
When repairing the central locking, first of all check the protection of the electrical circuit. In addition to fuses, circuit breakers can be used on the car. Move the switches from one position to another several times. The engine must be off. Listen carefully: you should hear faint clicks from the tripping relay.
Step 3
If there are no clicks, check for voltage at the switches. If voltage is present, check the electrical circuit between the fuse box and the breakers themselves. If open or short circuits are found in the circuit, repair them. If the problem persists, check the switches for current carrying capacity. If the switches do not conduct electricity in either position, replace them with new ones.
Step 4
If the switches are operational, but the clicks of the relay are not heard, check the electrical circuit between the switches and the relay. If a break is found, repair the wiring. Check relay. If the relay receives voltage from the switch but does not send it to the solenoids, check the grounding of the relay case. If the grounding is correct, replace the relay.
Step 5
If the solenoid on one of the doors does not work, remove the inner trim of the corresponding door and check the presence of voltage on the solenoid in both switch positions. In this case, the voltage must be on one wire when the switch is in the "closed" position. When you change the position of the switch, voltage on this wire should disappear, on the other - it should appear. If not, change the solenoid. If there is no voltage at the solenoid, check the condition of the wire from the solenoid to the relay.
