Contents: Examination ↓ Driver's door lock switch ↓ Passenger door lock switch ↓ Rear Compartment Door Lock Switch ↓
The electric drive consists of switches, a lock drive, a control unit and wires.
The control unit is mounted in the passenger compartment, to the right of the fuse box. You can perform simple checks of the drive and connections yourself. More detailed checks and troubleshooting of serious faults are performed at a car service center.
The locks are controlled by reversible solenoids mounted in the door niches.
The lock switches have 2 positions Lock and Unlock. The switch sends a signal to the control unit to unlock or lock the door. The control unit changes the polarity of the signal in accordance with the switch position, as a result the solenoid coil terminals are connected either to ground or to the 12 V power supply.
Some vehicles have anti-theft devices built into the door locks.
Examination
1. First, the fuses and circuit breakers are checked.
2. When the lock drive is activated, a click should be heard in any position of the switch.
Driver's door lock switch
3. In the LOCK position of the switch, the circuit should be between terminals 2 and 4.
4. In the OFF position of the switch there should be no circuit between the terminals.
5. In the UNLOCK position of the switch, the circuit should be between terminals 2 and 3.
Passenger door lock switch
6. In the LOCK position of the switch, the circuit should be between terminals 3 and 4.
7. In the OFF position of the switch there should be no circuit between the terminals.
8. In the UNLOCK position of the switch, the circuit should be between terminals 2 and 4.
Rear Compartment Door Lock Switch
9. In the LOCK position of the switch, the circuit should be between terminals 1 and 6, and also between terminals 3 and 4.
10. In the UNLOCK position of the switch, the circuit should be between terminals 1 and 3, and also between terminals 4 and 6.
11. There should be a circuit between pins 2 and 5 (backlight chain).
12. If the switches are OK, check for a break in the wires connecting the control unit, solenoids and switches. Otherwise, replace the switch.
13. Check the ground connection of the control unit and switches.
14. If only one solenoid does not work, check for voltage by removing the door trim. In the Lock position, there should be voltage on one of the wires. After moving the switch to the Unlock position, there should be voltage on the opposite wire.
15. If there is voltage, replace the solenoid.
16. Otherwise, check the relay or wire between the control unit and the solenoid. As a rule, this wire breaks when closing and opening the door.