Left turn signal inoperative?
 

Left Turn Signal
I own a 2001 Cadillac Seville SLS with 213,000 miles. Just recently the left turn signal stopped working, thinking it was a minor problem such as a bulb I replaced the bulbs front & rear and no help. When I select the hazardous lights to on, only the right side blinks? The left side is completely dead front & rear with the turn signal lever & the hazardous lights selected.

Looking at wiring print 642254 I need some assistance locating items. Can you guide me down the right path?