radio display black does not power on. Rh low head lamp inop , lh rear tail light inop

Joel Diagnostician Soquel, California Posted   Latest   Edited  
Question
Electrical
Infotainment
2014 Chevrolet Volt 1.4L (4 LUU) (4ET50)
Blowing Fuse F7

I have been diagnosys this volt for a short on fuse F7 label interior lights. how ever all interior lights are operating when opening any door . even when the fuse is blown installing new fuse , right away pops.

okay ,so I installed a 300 ma lamp test light in series of course is illuminating. I disconnected the conector 4 on bcm ligth goes off from fuse it goes to this connector, so nice this leg is not shorted , now connected back light iluminates. while I was trying to make sense of the diagram the test light when off , I had closed the door lock latch. I was humm the short disappear. I open the drivers door and boom short is back, and after the interior light command time out , the short goes away. during the short was live I unplugged 1 by one the bcm conectors , of course x4, , but other than that , when unplugged connector 7 the call x7. the short goes away. my color wiring diagrams only shows until x6 connector. since I do not have the map( wiring diagrams) I stoped there and I am going back on Saturday.

history : customer said when on vacation for about a month and when he came back the 12 v battery was dead . jump started and now info center for radio / hvac the screen is black doesn power on . and the other lights no working RH low beamand lh rear and blow fuse he doesn't remenber if appear at the same time . 

I need help with diagram for connector x7. I only could obtain pin out . but I am trying to make sense if this is caused by an input from doors, and any out put circuit in other conector having the current flow. and I am confused with blown f7 fuse , why all onterior ligths work .

any advised is appreciated. 

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

When working with parasitic draw, always use either an inline amp meter, or a current probe that is very stable and does not drift. Using a test light for this test is very hard on your nerves, since you have no idea how much current is flowing through the circuit. Parasitic draw is measured in miliamps. Before you start the job, open the doors, and close the locks, so you the interior vehicle…

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Joel Diagnostician
Soquel, California
Joel Default
 

thaks alvin, this is direct short what I have I need current flow, for testing that is why I have the test light in line in the fuse in series . yes I use the amp clamp or voltage drop acrros fuses for parasitic draw .

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

Since you have a short to ground, use a headlight bulb in place of the fuse for that circuit. The headlight bulb will limit the current to the circuit. Let it sit for a while with the circuit loaded, then use an IR camera to take a picture of the circuit. Let the heat lead you to the problem.

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

Which fuse f7 is blowing, I see on the power distribution diagrams there is multiple F7 fuses. F7DL F7DR F7RA.

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Joel Diagnostician
Soquel, California
Joel Default
   

Thanks for the response ,fuse box is on the end of the dash rh side . the only label on the fuse is 7 , interior light

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

So its F7DR. Does your short go away when connector x5 is disconnected.

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

When the F7DR (INT LAMPS) fuse is open, both dome lamps, sunshade lamps, reading lamps, and backup lamps will be inoperative. I would make sure you do nont have a shorted bulb before you get too far into this.

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Joel Diagnostician
Soquel, California
Joel Default
 

I unplugged all interior lights ,map trunk , dome light still present the short , I did not do any thing on the reverse ligth

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Joel Diagnostician
Soquel, California
Joel Default
 

that is the wear part all interuor ligths iluminates when I open the doors and go off if I closed them with the blown fuse

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Joel Diagnostician
Soquel, California
Joel Default
 

yes it does , or when the bcm goes to sleepafter about 15 minutes of closing the doors, as soon as I open any door is back

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Joel Diagnostician
Soquel, California
Joel Default
 

Yes , the wire that goes from the fuse to bcm , to connector x5 pin4 it dos go away , the short, and that short is passing through the bcm because after closing the doors and bcm goes to sleep , the short disappear

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

How much current is flowing when the short occurs?

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Joel Diagnostician
Soquel, California
Joel Default
 

probably unlimited , the 7.5 fuse pop up rigth away, I have a test ligth in series , my test ligth draws 330 ma with full power and ground, with the short is drawing , 240 ma

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Joel Diagnostician
Soquel, California
Joel Default
 

tomorrow I am goung back to that vehicle

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Cornelio Technician
Richmond, California
Cornelio Default
 

what information system are you using? I have Mitchel on demand and it shows connector x7, I jus don't know how to attach it.

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Joel Diagnostician
Soquel, California
Joel Default
 

all data

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

The all data oem diagram I do not think is correct. I was also using that. The oem diagram is different on identifix

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Joel Diagnostician
Soquel, California
Joel Default
 

in pdf

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
   

These may help. They call the fuse F7DA on these diagrams. [Attachments removed from DN due to copyright concerns.]

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Joel Diagnostician
Soquel, California
Joel Default
 

thank you , I got that far how ever what is conected to x7 every load and input is what I am having trouble

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

What happens if you disconnect x208.

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Joel Diagnostician
Soquel, California
Joel Default
 

connector 2 pin 8?? I do not know yte

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Tyler Technician
Hammonds Plains , Nova Scotia
Tyler Default
 

Connector x208.

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JJ Technician
Quincy, Massachusetts
JJ Default
 

All-Data's non-oe diagrams seem better in this instance. Search for body control module and pick the non-oe diagram, it has connector x7 and where each wire goes off to for the interior lighting system. You'll probably need to have a couple tabs open so you can switch back and forth easily. Is there any circuit you specifically are interested in?

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Joel Diagnostician
Soquel, California
Joel Default
 

not really a circuit because at thispoints I am trying to figure out for the responsible of the cause of the short

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Joel Diagnostician
Soquel, California
Joel Delay
   

Customer opted do not repair that leg of the interior kugths , su vicer will be inop

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