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How To: Bypass Rear Bulb warning for LED tailights


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Serge described this pretty well here. I will admit he did all the research, the legwork, everything pretty much. lol. Check out his thread here:

But there were some issues with his write up that I wanted to address and improve. 

First, is the lack of responses! Not a single person commented on this thread and its a pretty useful one for the people who need this.

The reason I am doing this mod is because I took the LED panel from the top of the S70 rear window and took it apart until it was just the LED board and crystal lenses and fit in into the 850R rear spoiler. Looks a lot better then the 5 incadecent bulbs and will last forever.

However I got the bulb out warning light whenever I hit the brakes after I did it. I found Serges thread and wanted to add my part to it.  

The difference for me is that I really only wanted the spoiler to be checked. I tried to just attach the 54H to 54 so it only checked the spoiler and it didn't work. So as far as I know you will have to do it for just the 2 sides or all 3 brake lights. Although eventually I am going to build some LED brake light panels and have them dim/brighten with my brakes and not have that stupid separate light in the bottom sides so I would have had to do this sooner or later anyways. 

I also wanted to address the lack of pictures in Serges thread with some of my own.

So here is the blue lighting box module that monitors the voltages and is what triggers the bulb out warning light. Its found just behind the drivers side tailight. I have highlighted the wires you have to attach together. 

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But here is where I wanted to do something different then Serge did. I didn't like the idea of pulling the pins out and just wrapping them together with a wire especially with the size of the 54 wire. Plus there is the risk of one of the wires coming out of the tape and touching on the body and shorting it out. 

So since I knew I could get another lighting module easy at the junkyard I pulled it apart and figured out you can just bend the wires inside together and just put a bit of solder and it works the exact same and is totally invisible and stock. If I wanted to reverse it all I have to do is get another box and plug it in. 

To take the lighting module apart, first you have to remove the reddish brown cover. Its just a square flat rectangle that will pop out once you get all the tabs. Then to remove the board there is two clips on either side of the plug you have to push with a flatblade while pushing on the connector. 

From there I cut the front 3 pins, then carefully bent them out of the way to reach the wirecutters to cut the back pin as long as possible. Then I used a flatblade to bend that back pin so it was pointed out and a little up. Then bent the side pins in so they were both touching it. Then I bent the middle pin around the other 3 pins and made sure they were all pretty tightly together. Lastly put some solder to finish it up. 

 

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I also wanted to add that I made sure that the bulb out warning light worked for other bulbs by removing my headlight and seeing if it still worked and it did, so it will retain all other functions. 

 

 

 

 

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