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Usually there is a circuit breaker in head lamp switch, that is for headlamps only. The other lamps are fuse protected, check for voltage to and from those fuses. Hopefully the diagram is large enough to read. I believe that diagram is for tail lamps. The black wire is ground for tail lamps, the other wire is voltage. I see two fuses in diagram.
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Dashboard backlight works together with the tail light. Both the headlight and tail light is controlled by relays. Check the engine bay fusebox. Look at the inside of the fusebox cover and you can see the 'location map'of relays and fuses. Theheadlight and tail light relays sits side-by-side. Change both and check for blown hedlight fuses..
Without testing we'd only be guessing . You need to look at a wiring diagram to see what all is involved in making the head lamps work . Then using a DVOM - digital volt ohm meter to test for B+ voltage in different parts of the headlamp electrical circuit's till the problem is found. Looking at the wiring diagram for the head lamps on your vehicle I see a lot of thing's that could have gone bad , one being the Light control module (electronic's) , Plus the headlamp / park lamp switch , headlamp dimmer switch , twilight sentinel control etc...... Your best bet , take it to a qualified repair shop , unless you know how to diagnose automotive electrical systems . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine . Under system click on lighting , then under subsystem click on headlamp's . Click the search button then the blue link's . Let me know if you think you can decipher what the diagram is showing .
You need to look at a wiring diagram to see what controls the head lamps ! Could be a relay's contacts are stuck shut causing lamps to stay on or could have a LCM - lighting control module shorted internally . The head lamp switch could be the problem . Do you know how to read a wiring diagram ? Do you know how to do basic automotive electrical testing ? You can check out such videos on you tube > Go http://www.bbbind.com/free_tsb.html for free wiring diagrams .
Have you checked applicable fuses for everything except head lamps? The headlamps themselves don't use a fuse. Check the battery junction block under the hood, one of your positive battery cables should go to junction block. If several fusible links check them. My info shows red wire carries battery voltage to head lamp switch for headlamps. The headlamp switch has two voltage circuits, mainly, one for the head lamps, for the other lamps that the switch controls, those smaller lamps are fuse protected.
The head light switch goes open circut most times on high beam . Two options to fix replace switch, or wire in a duel head light relay. I have used the second option in our shop many times.
On these cars the headlights get power from a right and left fuse and the headlight / dimmer switches provide the ground circuit. Both headlights are connected to one ground wire for high and one for low beam. So if one works and the other does not, the problem should be in the wiring before the headlight switch. Red is for high beam and red-white is for low beam. You should be able to jumper the red-white wire on the right headlight and make the low beam circuit for both sides work to test it.
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