Unordinary Trouble,Engine not Cranking

This Problem gave to me my workshop manager due to the first technician who work of this car conceive and give it to manager, first thing i thing about it before start to work why and where does this trouble. It is from electrical or mechanical. Again before i start ,I ask background of this car to the first technician if what are the parts he check.Because it is very important for us to know the problem and background. thinking of it not ordinary trouble only.
1) Trouble Condition;

• Engine not Cranking.

2) Trouble Cause:

• malfunctioning passenger fuse box due to jump wire to the CAN wire. of the data link connector.

3) Diagnosis:

1. Scan tool check.
   = No trouble found.
2. Battery voltage check.
   = check battery with battery tester: ok.
3. check the wire of starter solenoid switch: No power going to starter.
4. check for the fuse : The fuse Ok.
5. Check the starter relay for function: The relay is Good.
6. check  the current of relay power and ground,
   SWITCH OFF.
   = Hot at all time circuit: Ok 12V
   = Ground terminal:Ok
   SWITCH ON:
   = one terminal from Ignition Switch no power at all condition.
7. Found out that the passenger fuse box malfunction internal damage.
   = the Question is WHY DOES FUSE BOX DAMAGE? 
   = As taxi car check the taxi meter and top light: found out that one wire directly connected to CAN low terminal in the data link connector,This is the main cause why this problem occurred.

4) Repair Guide:

• Replace passenger fuse box and repair wire the connected wire, As a result Engine start.