Regular headlamps or HID ? Check the HDLP LO/HID relay in the under hood fuse / relay box . Will be marked on the inside of the lid . Do you know what a BCM is ? body control module. Could have DTC'S - diagnostic trouble codes stored .
DTC 2575 00: Headlamp Low Beam Control Circuit
If the test lamp illuminates, test the control circuit for a short to voltage.
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
If greater than the specified range, test the ground circuit for an open/high resistance.
If the low beam headlamps do not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative low beam headlamp.
If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
?‡'
If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
SOURCE: 1993 Chevy Silverado truck headlights high beam only works no low
dimmer switch has gone bad need to change your dimmerswitch
SOURCE: Headlights wont work on 2000
Check the fusible links under the hood. Also, double check the bulbs are in fact good. Lastly it could be a defective daytime running light relay.
SOURCE: 2002 S10 CHEVY TRUCK. LOW BEAM LIGHTS NOT
The most common problem is the DRL-- or Daytime Running Module
HEADLIGHTS NOT WORKING
It
can be faulty headlight switch or issue with its wiring. Or its faulty head
light fuse.
==========
To
troubleshoot the issue i suggest you few help links with appropriate solution.
So you can follow the test and confirm what exact problem is there in your case
of headlights not working:-----
Click
the link below: -----
http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html
----------
• Working of Headlight switch?
------------
• Both headlight bulbs blow together?
------------
• Car
headlight bulbs don't last long?
---------------
http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html
----------
----------
----------
--------
----------
http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html
------------
http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html
---------
How to Replace a Headlight
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight.html
------------
How to Replace a Headlight
Bulb
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-bulb.html
-----------
How to Replace a Headlight
Switch
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-switch.html
----------
How to Replace a Headlight Assembly
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-assembly.html
How to Replace a Park Light Assembly
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-park-light-assembly.html
-----------
http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html
----------
http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-door.html
----------
http://schematicsdiagram.blogspot.com/2012/01/how-to-replace-hid-headlight-bulbs-for.html
----------------
These
will help.
Thanks.
http://repairhelpcenter.blogspot.com/2012/01/passenger-side-low-beam-out.html
------------
Low beam HID light goes out?
http://schematicsdiagram.blogspot.com/2012/01/low-beam-hid-light-goes-out.html
----------2007 Dodge Caliber: Low Beam Headlight Not working
http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html
-------------Chevy Tahoe: Low Beam Lamps are not working?
http://technoanswers.blogspot.in/2012/04/chevy-tahoe-low-beam-lamps-are-not.html
----------2001 Chevrolet Tahoe: Both Low Beam Lamps Not Working?
http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html
--------------2002 Toyota Tacoma: Low Beams not working?
http://technoanswers.blogspot.in/2012/04/2002-toyota-tacoma-low-beams-not.html
-----------Low beam headlights Modification?
http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html
-----------DRL and Low beams not working?
http://schematicsdiagram.blogspot.in/2012/04/drl-and-low-beams-not-working.html
-----------These will help.Thanks.
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