OBD Port No Power
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6th Gear
Joined: Jan 2020
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OBD Port No Power
Excellent forum! I have been a long time lurker, but this is the first time I have not been able to find the answer.
I have a 2012 LR4 and last week I used the OBDII port with my Nanocom without issue. Last night I went to connect it, and... nothing. No power.
At first I thought "oh Lord, what have I done to break my Nanocom" but I quickly set out to eliminate that possibility. I plugged in another bluetooth ODB scanner with a led light, and nothing.
Note: It was raining all day yesterday. I do not see any leaks in pillars or headliners, but that does not mean it is out of the possibility. I drove with the Nanocom connected to see if there was an intermittent ground issue, or maybe a loose wire, hoping I would see a flash at least. Nothing
I scoured the internet and forums trying to find someone else with the same issue. I was not able to find anyone with an LR4 that had the same problem. I downloaded a workshop manual trying to find the diagram to show me circuits/grounds/fuses but never found OBDII in the 167 pages there.
Does anyone know the correct fuse #s to check that would affect the OBD port? I checked what I thought were all of the 5A fuses behind the glove box and in the battery compartment. Or, might there be some other gremlin that I am missing?
I have a 2012 LR4 and last week I used the OBDII port with my Nanocom without issue. Last night I went to connect it, and... nothing. No power.
At first I thought "oh Lord, what have I done to break my Nanocom" but I quickly set out to eliminate that possibility. I plugged in another bluetooth ODB scanner with a led light, and nothing.
Note: It was raining all day yesterday. I do not see any leaks in pillars or headliners, but that does not mean it is out of the possibility. I drove with the Nanocom connected to see if there was an intermittent ground issue, or maybe a loose wire, hoping I would see a flash at least. Nothing
I scoured the internet and forums trying to find someone else with the same issue. I was not able to find anyone with an LR4 that had the same problem. I downloaded a workshop manual trying to find the diagram to show me circuits/grounds/fuses but never found OBDII in the 167 pages there.
Does anyone know the correct fuse #s to check that would affect the OBD port? I checked what I thought were all of the 5A fuses behind the glove box and in the battery compartment. Or, might there be some other gremlin that I am missing?
Last edited by eng1tx; Jan 22, 2020 at 06:23 PM.
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6th Gear
Joined: Jan 2020
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Likes: 2
I am going to answer my own post for the next guy. I found another post on this site with a much better set of manuals located here:
Thank you to DakotaTravler
Page 133 (136 if printing) of the electrical diagram shows the diagnostic port - fuse #66P 5A in the central fuse box (behind glove box), and link 18E 50A under the hood. I am going to test these tonight when I get home and report back.
Thank you to DakotaTravler
Try here. Not sure which file, but I think the entire LR4 workshop is here in one of these:
https://onedrive.live.com/?authkey=%...C2D89C85C7C171
https://onedrive.live.com/?authkey=%...C2D89C85C7C171
Page 133 (136 if printing) of the electrical diagram shows the diagnostic port - fuse #66P 5A in the central fuse box (behind glove box), and link 18E 50A under the hood. I am going to test these tonight when I get home and report back.
Last edited by eng1tx; Jan 22, 2020 at 06:22 PM.
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6th Gear
Joined: Jan 2020
Posts: 6
Likes: 2
Fuse 66P was bad. I had checked that fuse two nights ago. When I checked it this time, it appeared at first glance good. I switched it with the 5A fuse from 65P and OBD port came alive. After a look under a magnifying glass I could see a slight separation of fuse material.
This proves that a quick visual inspection will not always catch a bad fuse.
The end.
This proves that a quick visual inspection will not always catch a bad fuse.
The end.
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