Automatic door-lock/unlock
CX-9 /2007 Version 1.0
Page 15
Appendix-A: Circuit details
NC
NC
NC
NC
LOCK
UNLOCK
GREY
RED
WHITE
BLACK
D1
1N4001
C1
2200uF/
25V
C2
1000uF/
25V
R2 - 1K
R1 - 56
+12V
To
Parkswitch
Ground
To
Doorlock
Activator Circuit
Pulse generator
Power on/off
Reset
Relay A
Relay B
Relay C
Contact
B
Contact
A
Contact
C
Contact
D
NO
NO
NO
NO
C3
100uF/
25V
D2
1N4001
The circuit has 3 major parts, build around 3 separate relays:
1.
Activator
: Triggered by the parking brake-switch.
2.
Pulse generator
: When triggered by the activator it creates the pulses for door lock/unlock.
3.
Power on/off reset:
Makes sure NO lock/unlock pulse is sent during the instable power-up and
power-down period of the circuit.
