CAT Caterpillar ET 3 Communication Error#142

Customer :
When trying to open CAT ET i get this:

No lights are on adapter, it is totally black/dead. Not even “USB” is light up.

Should not USB start to light when connecting to laptop?
Do I need to connect adapter to machine for it to work?

OBDII.SHOP :
hello ,did you connect your truck please ?
which year and model vehicle you connected ?
did you start engine or not ?

Customer :
Hi,I did not Connect to vehicle. Only connected to laptop.
But adapter seems dead (no lights as shown in picture).
Do I have to Connect to vehicle for adapter to light up?

OBDII.SHOP :
yes of course
you have to connect the vehicle and start engine offer charger to the CAT ET 3 unit , then will be light on
by the way ,make sure all cables connected well with laptop and your vehicle

Customer :
I was sure the «USB» light should light when connecting to laptop:)
OK, I will try connecting to a vehicle then.
Yes , I’ve tested with connected to vehicle and it works fine:)

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