2001 Tahoe courtesy fuse blowing

[skeeballhead]

Got a 2001 Tahoe, the courtesy lamp fuse keeps blowing. As soon as I put it in, it blows. I found the body control module, but where is the courtesy lamp relay, junction block body and inadvertent power relay located. The system is shorting to ground. Would a Tech 2 tool tell me if BCM is communicating with computer? Any advice?

 

[rockenthebowtie]

Check the wiring harness near the park brake assy as it loops around it

 

[skeeballhead]

Will check it out. If u unplug harness from body control module, the meter shows it not shorting to ground. So would that mean it is after the module?? My buddy thinks I will find it easily with some power probe deal. Or will a tech 2 monitor decipher it? Old lady wants interior lights, but funds are tight to take to dealer right now.

 

[rockenthebowtie]

Pull out the INADVERTANT POWER RELAY in the junction block assy thats the relay that lives up to it's name it supplies the power to the Courtesy Lamps.. the CTSY Lamp Relay controls the ground side of the loaded (lamp bulb) circuit that are both controlled by the BCM through the ground side of each relay.. so it can not be the BCM causing fuse to blow.. in other words if the BCM was shorted to ground the lamps would stay on all the time.. check park brake assy area ..

 

[rockenthebowtie]

Oh BTW even if you weren't a little old lady I still would've helped you

 

[skeeballhead]

Are those relays by the park brake area, that is what we couldn find yesterday. And ur advice is to check harness down there? Are the relays diagnosable then?

 

[skeeballhead]

Was meaning my ole lady, lol

 

[rockenthebowtie]

There in the junction block assy down by the park brake assy.. the harness comes out of JB assy then loopes around the back side of the P.B assy that has sharp edges and eventually cuts thru the harness and circuitry .. don't waste your time chasing shorted relays

 

[skeeballhead]

Harness was perfect, no contact with park brake assy

 

[rockenthebowtie]

Ok remove Inadvertant power relay and see if the short goes away if it does well the short is going to be after the relay if not then its got to be in the junction block assy.. internally.. at this point your going to have to trace the wiring and or remove one interior lamp bulb at a time the doors under the dash. The gove compartment dome and map lamp bulbs and go from there

 

[skeeballhead]

Wish there was some tool that could just pinpoint where shorts were. Not that the courtesy lights are a big deal, but I am on a quest now. You have any pointers or advice? Thanks by the way for all your help thus far.

 

[rockenthebowtie]

Did you try removing the IPR form junction block assy to see if the short would go away.. if the short DOESN'T go away with the IPR removed the short is going to to be anywhere from the underhood fuse block to where it goes thru the firewall to the junction block assy.. try that and see what happens.. well take it a step at a time dont want to confuse you with to much info at once

 

[rockenthebowtie]

So did you ever get around to locating the short ?

 

[skeeballhead]

Well, today a friend with a power probe ect2000 hooked it up and found that his tester was beeping at junction block assy but when he followed loom to fuse panel on left side of dash it quit right after loom exited junction block assy. Have u seen those go bad??

 

[skeeballhead]

Finally figured it out. After we replaced the heater core, we accidently plugged the glove box wiring connector into a shielded ground that was on top of dash on right side. It is a uninsulated ground wire and white wire that has a connector on it the same as the glove box light. Anyway, as soon as you plug it in, it blows the fuse. Goofy deal to say the least. My question is: what is supposed to plug into that shielded ground connector? Some other option or something?

 

[rockenthebowtie]

You know what bro I'm the type that doesn't mind helping out but your having me chase a ghost by leaving out vital information like replacing the heatet core could've saved us both some time to where I could've led you in another direction don't you think Not Cool bro..

 

[skeeballhead]

Hey bro, just forgot to mention in beginning. We thought courtesy lamps never worked, had just bought then. Whether cool or not, wasn't intentional, have a coke and smile and relax.

 

[rockenthebowtie]

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[rockenthebowtie]

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[skeeballhead]

For some reason u think I tried to do something wrong here on purpose. That is great ur a wealth of info, I do and always appreciated ur responses, but I'm new on here so for what it is I apologize for not giving all the info, was just trying to troubleshoot what my deal was. Next time will before complete. And if ur offended and don't want to respond to some future question, that is fair. But I wasn't intentionally trying to hide somethin.