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are your daytime running lamps working. if they are according to the schematic there are 4 relays, fog lamp, fog lamp cut off, isolation, and daytime running lamp; 2 fuses: right and left, that supply volts to the headlamps. it's a little confusing though, because these schematics might have some mistakes. anyway, it looks like the drl relay.grounds the headlamps when the drl control in the micro processor located in the instrument cluster senses the headlamps have been turned on. this trips the relay and 12vdc is supplied. the dlr might be bad. otherwise, i would think you have a hardwire or connector problem.
Your Hazard switch is bad. There were a bunch that had faulty soldering connections, and would fail prematurely. This circuit also competes with the turn signals, and the brake lights. Replace the switch with an aftermarket replacement, and it should fix your issue.