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2007 denali in for a recall on washer fluid..headlights..low beam…

i just took in a...
i just took in a 2007 denali in for a recall on washer fluid I believe, now the headlights are not working on low beam any suggestions. it being a holiday weekend cant get anyone till Monday.
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Answered in 10 minutes by:
7/3/2010
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3,432
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer
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Hello and welcome. when this recall gets performed, there is a fuse that gets removed, so lets start with the fuse block, maybe a wrong fuse got pulled or a relay got bumped. open the hood, on the drivers side of engine compartment, there is a fuse block. I need you to check a couple of fuses to make sure they are there and are good. fuse numbers 11 and 16 are 20 amp fuses. make sure both of these fuses are installed and are good?
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Customer reply replied 8 years ago
yes both are in and good
good deal. now we need to check the low beam headlight relay. the relay is marked HDLP LO/HID in the same fuse block. make sure it is there and is plugged in good?
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Customer reply replied 8 years ago
yes
Ok, there is a relay marked DRL/PCB, swap it with the lo beam headlight relay we just checked. it is the same part number as the headlight relay. then try turning on the headlights, let me know?
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Customer reply replied 8 years ago
didnt see DLR/PCB but switched it with rear defog. still nothing
Ok. I have done several of these recalls. we have just about covered all the areas they would have been working. do you have a test light or a voltmeter to make a couple of checks?
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Customer reply replied 8 years ago
not here with me. I had them do a car detail, do u think its possible water got in something and shorted something out?
that is possible. I was looking to see if there is power to the headlight fuses. this would tell us where to look. oddly enough I have see both headlights go at the same time. it hards to believe, but it does happen. the left and right headlights are powered by two separate circuits, that is why there is two headlight fuses. the relay, which you already switched is one common part to both headlights, the other common part is the body control module that controls the relay. the body control module requires a scan tool to check. if we knew that the fuses have battery voltage on them, would tell us the body control module is good. that would leave us with the headlight bulbs them self. or the under hood fuse block assembly know as the UBEC. which if they did a detail and power washed the engine compartment may have gotten damaged.
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3,432
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer
Verified
goodwrench9124 and 87 other GM Specialists are ready to help you
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Customer reply replied 8 years ago
Would the body control module be affected by the powerwashing?
no, the body control module is mounted inside the vehicle under the dash.
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