Can not get the time to display on my BT555U car stereo

If it Sirius capable, get the radio's Sirius satellite ESN, (electronic serial number), from your radio and call Sirius satellite radio and they will tell you what to do. I don't know how to get this number from your unit but in my Lincoln, all I had to do was push and hold the Sirius button on the dash with the radio on and it popped up on the display. Your instruction manual should tell you how to do it. If it isn't compatible, you'll have to buy a Sirius receiver and have it activated with them. Good luck.

Hello, here is website for manual:
Kenwood KDC BT555U Instruction Manual

by using bluetooth on your phone and in the car

It sounds like you removed the remote wire from the factory amp to run your aftermarket amp. You need to reconnect it, and if necessary, split it to go to both.

Try, looking a code to activate alot radios have a code to take them out of demo mode, i would consult the owners manual for a code of some sort

its more than likely the back light.
if its a removable front then tke it off and check that all the contacts are sitting prominantly so to contact the removable front and check for dirt or ware and tare on them if not then either its warrenty job or take it to repair shop

If audio can be heard
Most likely this is a fault of a bad face plate and would need to be replaced.

You ever get this figured out? Having the same problem

Press SCRL DISP repeatedly. This should change the display to clock.

Turn on the car so the radio is flashing "Protect." Look on the front / removable face of the stereo. On it you will find a small round hole - that's a reset button. Find a small paper clip, unfold the clip and stick it gently into the hole. The "Protect" will stop flashing, and Kenwood will be displayed. Unfortunately all your settings/presets will be gone, but at least the stereo is working again!