1，Firstly find start stop button power wire;
It always has power at any status, voltage never changed.

2 ，Check start wire signal if it is negative or positive? 
Use multimeter black pen to touch ground, re pen to target wire, there is 12V on the digital screen, it is positive signal , instead, red pen to 12V, black pen to target wire, there is 12V on the digital screen , it is negative signal .

3，Correct start wire: 
Normal status: this wire is 0 V, press the brake press button to start, it is 12V, release start stop button , it will be 0V again. Or press down start stop button , two wires will be closed circuit, as for some special car model such as suzuki, it has two groups of wire which are normal open as usual, but they are normal closed circuit when you press down start stop button . our system provides extra wires of this special use purpose.

4 ，when you find power wire and start wire, you need to find LED wire of start stop button. 
Don’t press the brake , press button once, it is ACC status , use multimeter pen to test target wire, when light is off , 12V wire is led light wire. Press again, it is ON status, start stop button light color will be changed with other color, when press button again, light is off , this wire isl led light wire .

5，How to connect footbrake wire?
Find original car footbrake switch which has normally three wires: brake signal wire, 12V power wire , brake bulb wire. 
Connect YUEBIZ yellow brake wire to brake signal wire, YUEBIZ white brake wire connects to 12V power.

6，How to find original car fuel path wire?
Find this wire at the bottom of primary door side, remove panel and then find one bundle of wires where you will find target fuel path wire . how to judge which wire is correct fuel path wire?
1.Start engine, testing pencil light is ON. 
2.Stop engine, testing pencil light is OFF. 
3.Turn the key to ON position, test pencil light is ON for several seconds and then off . 
This is correct fuel path wire you are finding, connect it to main unit blue wire .

7，Find central lock or unlock control wire? Find central lock actuator’s lock or unlock signal wire? 
Give negative power or positive power to target lock or unlock control wire, car door will have lock or unlock action. 
Press door lock control switch , use test pencil to touch target wire, test pencil light will be ON and OFF, this is central lock unlock signal checking wire, lock or unlock signal wire is used for remote start or app start stop status updated purpose .

8，Clutch output wire is for manual transmission car with start top button;

9，handbrake wire is connected to handbrake switch or car metal body ( auto Tranmission)

10，About trunk output or siren output, system provides two wires for easy connection without adding extra relay.