Issue: Burning smell in vehicle. Diagnosis: driver side visor wiring burned, potential fire hazard. Notes: We noticed a burning plastic smell several times in vehicle cabin. I searched around but couldnât locate the smell. After the third time, the Homelink garage door opener located in the driverâs side sun visor stopped working. Also noted that the vanity mirror lights were not working either. This wiring is not on a fuse. I check the wiring to the visor with a voltmeter and noted 12 bolts to the visor. I removed the passenger visor and plugged it into the driver side. The vanity mirror lights had power and worked. Plugging the driver side visor into the passenger side showed it to not work. Therefore, the issue is the wiring burned inside the visor, breaking the connection. The visor is stitched all around and not easily accessible without cutting and thereby ruining the fabric and appearance of the visor. So wiring is not easily accessible without having to install a new liner.