Do you have access to Mitchell1 Prodemand, or eautorepair.net DIY? If you are willing to share user/password (we can pay), please get in contact with us ASAP (truly, it is urgent): email operation-charm [[at]] tuta.io or click to submit anonymously
Ground Strap Connection Check
When the radio ground strap is not connected, AM radio stations will be weaker and may be noticeable to a customer who listens to weak or moderate AM stations. The radio ground strap gives the audio system a longer range than without the radio ground strap. The ground strap greatly diminishes switch pops from the brake switch, turn signal, and wiper delay systems. The ground strap, used with the motor mount ground strap, also diminishes ignition noise.If you suspect the ground strap is disconnected, visually check for connection behind the radio.