2005 TB Lt EXT, 4.2, 2wd, auto. Got used. Door open/key on dinger does not chime. Also notice a Pioneer radio has been installed. Radio plays thru right front speaker only. Pulled door panel and hooked up a tested speaker in left door and no sound! Know dinger only chimes thru left door speaker......so has some relay/fuse been pulled to disable dinger? Have adjusted, or tried to adjust radio balance/fader etc. but still no sound thru left front speaker. Any help?