The problem is found, that is, this line is broken. Baojun 730, tailgate button cannot open the tailgate. The tailgate can be opened using the remote control, but it cannot be unlocked with the tailgate button switch. enter

The problem is found, that is, this line is broken. Baojun 730, tailgate button cannot open the tailgate. The tailgate can be opened using the remote control, but it cannot be unlocked with the tailgate button switch. Enter the body module, read the switch status information, and the data of the opening and closing tailgate switch has not changed, and it has been closed.

The problem was repaired to this point, and I still took out my ancestral circuit diagram and came out to analyze this fault.

First of all, the remote control can unlock the tailgate, proving that the tailgate motor and tailgate lock block, as well as the tailgate motor related wiring, to the module including the tie are no problem.

Then use the tailgate button to switch it does not unlock the tailgate. I short-connected the tailgate switch with a short line, and the tailgate switch is still useless, so the tailgate switch is no problem.

A normal car will output a voltage signal from the body control module to the tailgate. This line of the tailgate switch may be 5 volts or 12 volts. You press this switch, and this line is connected to the iron wire, and this line becomes a spirit stone.

Then the body control module detects the change in voltage, from 5 volts or 12 volts to 0 volts, and when it detects it, the body control module will control the tailgate motor to unlock the tailgate. And then shorted it doesn't work.

I used a multimeter, connected this line at one end and connected the iron wire at the other, measured it and found that it was 0V and there was no voltage.

I am afraid that there is a problem with the iron wire, I use a multimeter to connect this line at one end, and the other end is another watch pen is connected to the body iron, it is still a 0V, then it means that the line out of the body control module has a broken circuit.

Then it's time to check and look for broken lines. Finally, it was checked that the line inside the connection between the tailgate and the body was broken, because the tailgate had to be opened and closed frequently, and the wire was torn off. Pick up the broken wire, close the tailgate and try it, it is normal to return to normal.