Headlights don't work after deck install

[ryan_eh]

I currently installed a kenwood ddx5902 on my 97 Tahoe 2dr and for some reason my headlights won't turn on now. As far as I know everything works fine with the deck and the rest of the truck but low beam and high beam won't work with the knob in any of the positions. Any help is greatly appreciated.

 

[SunlitComet]

check the big lighting fuse under the hood and make sure the headlamp switch connector is fully seated and has no damaged terminals. do interior lights work?

 

[ryan_eh]

I forgot to mention I checked all the relevant fuses or ones that I thought might be relevant including the big lighting one under the hood. Just check the connected and as far as I know all the connections are fine. I looked at the stereo wiring diagram online and I don't think it's an issue but could they're be something I connected to the wrong wire? I know it's not the best picture but the one I'm kind of confused with is the blue wire that's heading out of the firewall, I think that wasn't there until I had my subs and amps installed - maybe that is suppose to be connected to the blue wire coming out of the factory harness?

This is where I got the diagram from http://www.modifiedlife.com/1997-chevrolet-tahoe-car-radio-wiring-diagram/

The thing I really don't understand is that it's not quite the same colours as the harness I have. They don't mention the red (dark orange) wire at all, and I wasn't 100% sure if my light orange wire is suppose to be connected to the orange and white of the aftermarket harness.

 

[SunlitComet]

i would look into further the blue wire location but if the lighting fuse under the hood is good then you either cut something on the left hand of dash or the headlight switch is defective. the radio or amp install otherwise should have not taken out the headlight system. i ask again do the interior lights work?

 

[ryan_eh]

My apologies the inside lights do work. I tried this troubleshoot here http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/headlight-switch-test-2 and there is 12 Volts coming to terminal c, I tried step 2 using just a piece a speaker wire to connect c and g - not sure if that would work with the speaker wire but the headlights did not come on. As a side note the blue wire does not actually come from the firewall but it looks like it heads to the back where my sub and amp are if that helps at all.

 

[SunlitComet]

what about drl light in cluster? does it light with switch off or on high or low?

 

[ryan_eh]

drl light in the cluster works normally, running out of ideas may just have to bring it into a shop

 

[SunlitComet]

so if the drl lights with ignition on and parking brake off does the drl light go off when you turn the headlight light switch on? do you hear a relay from lower left of dash click? that would be the drl relay on the junction block down there mounted on the firewall. i am not out of ideas to keep at it.

 

[ryan_eh]

The drl light goes off in the on position. I'm pretty sure I hear a click when I turn the switch, but not sure exactly what the relay is down there. Interestingly my headlights came back on today, but only in the off and low position not in the on position, and high beams still don't work at all.

 

[ryan_eh]

Just a quick update, took apart my drl switch and found this on the bottom of it which appears to be broken. Not sure what it is, to me it looks like a light but it had a blue plastic cover on it and nothing illuminates blue in there. I was looking for a circuit breaker inside the switch because the manual said there is one inside but I couldn't find anything. Not sure if it is relevant but figured I'd post it anyways.