Hi,
We have two solutions here.
First one is,short DOUT 1 & 2 and connect parallel to buzzer and immobilizer relay.
This setup will work fine as per your requirement but the only thing is immobilizer relay will trigger for green driving scenario also.
In practical case, this additional relay triggering will not create any issue in the vehicle because we are installing the relay in starter control cable.Once the vehicle is started,this cable doesn't have any role in the vehicle operation.
If you want to stop this additional relay triggering completely you can use the below method.
Connect DOUT 1 to buzzer and configure for green driving and over speeding.
Connect DOUT 2 to Immobilizer relay and configure for immobilization.
Connect one 1n4001 Diode between DOUT 1 & 2, Positive terminal of the diode should be connected to DOUT 1 and Negative terminal of the diode (The side which have a marking) should be connected to DOUT 2.
I hope this will work for you.
Thanks in advance
Naveen