"No Signal Found" shows up on monitor screen periodically while driving in city areas

Mute Button

https://www.google.com/search?q=clarion+nx501+mute+button&

NX501E NZ501E

Clarion Global https://www.clarion.com > MungoBlobs > NX501... PDF • Press this button more than 1 second to stop video and audio media. [MUTE] Button. • Mute or Unmute the speaker. • The symbol on upper right area of the ...
123 pages

Switching On, Off Or Mute; Audio Source Selection; ...

ManualsLib https://www.manualslib.com > ... > User manual Press the button again to cancel the mute function. ... by turning off the vehicle ignition and removing the vehicle ignition key. Audio source selection. AM/FM.

NX501A

Clarion Global https://www.clarion.com > NX501A_ENG PDF • Press this button more than 1 second to stop video and audio media. [MUTE] Button. • Mute or Unmute the speaker. • The symbol on upper right area of the ...
138 pages

Functions Of Remote Control Buttons - Clarion Manuals

ManualsLib https://www.manualslib.com > manual > Clarion-Nx501 Functions Of Remote Control Buttons - Clarion NX501 Owner's Manual & Installation Manual ... and audio media. [MUTE] Button. • Mute or Unmute the speaker. • The .

..

Question edited for clarity.

In the manual

NX501E NZ501E - Clarion

https://www.clarion.com > MungoBlobs > NX501E_...
PDF
Press this button to hardware reset the unit. Note: When the [RESET] button is pressed, frequencies of radio stations, titles, etc. stored in memory are.

//

I recommend you contacting a local car audio professional, or you may contact Clarion customer support directly by clicking here:

https://clarion.com/xe/en/user-support/inquiry/contactus

I trust this information has proven beneficial.

Did you have the ORANGE WHITE wire wired to some connection that is live all the time? http://www.manualslib.com/manual/573841/Clarion-Nx501.html?page=66#manual

No idea.
Recommend contacting a local car audio professional or Clarion customer support directly here:

https://clarion.com/xe/en/user-support/inquiry/contactus

Page 51 of the manual, under General Setup Menu, is Clock.
Here is where you set time, AM/PM, or 12/24 hour clock,

The small slot is for a MicroSD (storage) card which is not required to be used for operation. I have no experience with this model but here is the link to the 160-page manual which you likely don't have. This may provide enough detail to resolve your problem.
Download manual

i hAVE the same exact issue and the 4 digit password to unlock it is the last 4 numbers the HINO trucks V.I.N... they say u only get 3 tries and it locks it and the only way to unlock it is to contact clarion... lick my balls clarion the default password is 0000 and u get 3 tries but just disconnect the power and reconnect the power and BAM... you will be asked to enter a security code all over again...0000 that is your unlock code.

as for the start- up HINO screen... good luck. its called a splash screen and you would have to hack clarions firmware in order to do so and i suppose if you were able to locate the internal hard drive but even then. clarion invested billions to protect their operation systems in their devices. i think the image is burned into the chip where the head unit was sent from a hino dealer brand new in a box directly to clarion's I.T. to have changed cause it comes factory as a clarion boot screen.

you will also notice that the hint clarion nx501 wiring harness is altered so to make work in that truck that only comes with two front speakers.... the rear speaker leads are nowhere to be found; GONE like a new brides panties!.. you also won't have any rya leads ect.. gay gay situation and if u figure out the splash screen change let me know.

peace.
S.D

Turn the fader control .To the rear speakers.

Please read my post here: http://community.crutchfield.com/forums/p/22187/251957.aspx (pasted below).

I hope you bought your unit at a Clarion dealer....

Hi, (Team Crutchfield - please add this to your knowledg-base.)
I'm on my third NX501 (could have been the fourth if not for working directly with Clarion).
The SD Card corruption causes both loss of Navigation and intermittent Sirius start up (it'll never acquire signal).
Your unit needs to use the exact micro sd card it came with forever (it has a permanent serial number).
You have two choices:
1. Get Crutchfield to replace the unit
2. Call Clarion (I suggest this rather than ripping your dash apart over and over).
Here's what to do. Contact:
Ben Kwan
Customer Service Technical Representative
Clarion Corporation of America
800-347-8667 ext 4342
Direct Line: 310-217-4342
Fax: 310-217-4243
Ben will have you send your microsd and rebuild it for you and return it (likely with the firmware upgrade that addresses this issues on another microsd that can also be found here: http://clarion.com/ca/en/support/navigation_updates/NX501Fupdate/index.html).
While you're at it, update the Bluetooth firmware too: http://www.clarion.com/us/en/support/software/NX501/index.html
Once you get the card returned (THIS IS HUGELY IMPORTANT - EVERYONE WITH A Clarion NX501 SHOULD DO THIS!!!), back it up using Naviextras toolbox (the program clarion uses for map updates). You can get it here: https://clarion.naviextras.com/shop/portal/downloads
Once you follow these steps, barring your micosd physically or logically self destructing, you'll have an NX501 that's nearly problem free and backed up just in case that unfortunate corruption reoccurs.

Of Note: Ensure you insert the microsd card with the contacts facing up and do not force anything.

I'm extremely confident this will make a world of difference for you (and anyone suffering the microsd corruption of the Clarion NX501).
Regards,
Marc (mshmovie)