We got to get Richard's post back on track.
As stated by Lagdti and other contributors, the easiest way forward is to read the fault code(s) stored in the control units of the car.
I did some work with the rear brakes of my Kangoo some time ago but forgot to connect the ABS wheel speed rotation sensors. I found later when connecting my FR704 that the fault had been detected by the ABS control unit as two faults were in memory:
[ RENAULT ]
Record3 -> KANGOO-> ABS -> Read Codes
DF009 REAR LEFT HAND WHEEL SPEED SENSOR SIGNAL (MEMORY)
DF029 REAR RIGHT HAND WHEEL SPEED SENSOR SIGNAL (MEMORY)
Checking the wheel speed sensors is easy. I just connect an oscilloscope and view the signal on the screen. With a two channel scope you can check both sides of the car at the same time by comparing the signal traces. This method is particularly good at detecting cracked reluctor rings. An easier way though is to tap the reluctor ring with a punch and hammer. A split ring will have a different "ring" and will most likely move axially.
Serv light could be as simple as low
level. I get that if the car is parked on an incline.
PS. The software on the FR704 is PC upgradable. I assume the main reason for this feature is to add future car models to the list of car models the tool can handle. This software upgrade is free from the manufacturer's web site.