Marco,

I am french, but from Montreal Canada not from France. I do not know what you mean by "sub-wires" but here is how to check the cable. First disconnect but ends of the cable. On each end of the cable there is an 8 pin connector. Assuming your cable is just like mine, set ohmmeter to read low value resistors since we are expecting resistance of value less than 2 ohms. Put both connector in front of you with the small wires on top. Make sure both connector are in the same orientation, that is wires comming out of cable both on the same side. With this configuration lets assume that pin 1 is on the left, that makes the pin on the right pin 8. Connect ohmeter to pin 1 on first connector and verify that you get a low resistance value when connecting other ohmeter lead to pin 8 of the other connector. Continue measuring from pin 2 to pin 7, pin 3 to pin 6, pin 4 to pin 5, pin 5 to pin 6, pin 6 to pin 5, pin 7 to pin 2 and pin 8 to pin1. Each of these connection should indicate less than 2 ohms of resistance. Note that if the test leads on your ohmeter use small wire guage you might have to substract the value read on the ohmeter when both test leads are connected together. You will probably also have to verify that there is no short in between pins, that is check that the ohmeter reads an open circuit between pin 1 and 2 of the same connector then between pin 2 and 3, 4 and 5, 5 and 6, 6 and 7 and finally between pin 7 and 8 on same connector. The wires on the connectors are very small so the tip of the test leads of the ohmeter may not be able to make contact with them, I had to use leads from a small capacitor to get inside the grove where the leads come out of the connector. If you don't have such small wires sewing needles might do the trick, but be carefull not to bend the pins on the connectors.

 I hope this is clear enough, if not let me know and I will try to include a picture.