FORD Radio Trick

Try This........
At the same time PRESS and HOLD buttons 3 & 6.
After 1 second, the radio goes into speaker check mode.
Quickly before it finishes, PRESS 3.
The radio should display relative signal strength from 0~60
Everything except volume is locked out.
To exit, turn power off. Normal operation resumes with power on.

Is there a trick to lockout am/fm radio

My Excursion has the worst reception.