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Lighting Forum
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Old 03-09-2014, 02:53 PM   #1
jM2.me
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Aftermarket LED Taillights troubleshooting

Here is a puzzler.

I bought LEd Taillights, and right off the start one of the taillights was flickering. Gladly seller sent a replacement resistor which fixed the issue.

Fast forward to today. Everything but one thing does not work. The brake section does not light up. It does work if brake pedal is pressed down, but does not light up dim when brake pedal is not pressed down.

I swapped resistors to see if that would help, and it did not. I then checked the wiring for faults as well. So I took out both of the tail lights to troubleshoot only one.

I started by checking the resistors that are soldered on. There are three types of them
  • 10W60ohmJ
  • 10W30ohmJ
  • 10W47ohmJ
I checked the 30Ohm and 47Ohm resistors on both taillights, and they do have a resistance of 30 and 47 ohm respectively. However, the 60ohm resistors are only 15ohm. Doesn't look right, does it?

So I switched the multimeter to continuity meter mode, and multimeter beeped when I checked 60ohm resistors. Tested 47ohm and 30ohm, but no beep...

The mainboard on left taillight is BM065-LOAD-L V2.0 99.02.04, but the board on right taillight is BM065-LOAD-R V1.0 99.02.04

I noticed that board had test points, but I did not have time to check those and put everything back together.

Clearly buying new resistor pack will not solve the issue since swapping resistors didn't help. Second, not sure what to think of wrong resistor readings. Are those resistors supposed to be 60ohm or 15ohm? Does anyone know if they were mislabeled?
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Old 03-10-2014, 03:54 PM   #2
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Bump
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Old 03-11-2014, 05:34 AM   #3
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Were you having issues before you bought the LED tail lights?

Have you tried swapping the lights to see if they function properly on the opposite side?
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Old 03-11-2014, 09:54 AM   #4
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Quote:
Originally Posted by turbo_f22_pilot View Post
Were you having issues before you bought the LED tail lights?
No.

Quote:
Originally Posted by turbo_f22_pilot View Post
Have you tried swapping the lights to see if they function properly on the opposite side?
I haven't because I thought that connectors are different. Going to give it a shot today.
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Old 03-11-2014, 08:44 PM   #5
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Even if that were the case, you could make a set of jumpers with some wire. Since you have a multimeter, you could find the various power / ground wires. Then you could find out if it's the lights or if you're having a ground issue or if it's something else.
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Last edited by turbo_f22_pilot; 03-11-2014 at 08:45 PM.
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Old 03-13-2014, 01:48 PM   #6
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Well, here is what I found.

8 pin tail light connectors look the same and could probably be swapped. However, the pin arrangement is different (mirrored), so it wouldn't be smart to swap the tail lights.
I did try measuring some voltages. With trunk open, one wire that is on same row as ground is receiving battery voltage.; One would assume that it is either constant voltage or voltage for trunk light.
Then I turned light switch from position 0 (off) to 1. On a working side, two pins below empty pin are receiving ~2.5V
On the other side, only one pin is receiving 2.5V while the other is 0V. This is 13 year old car so I wouldn't be surprised to find shorted or open wire.
Took light control mode out, unplugged the connector, and grabbed dad's wire tracker. I have no idea how reliable wire trackers are, but receiver did get a reading from transmitter.
Unfortunately it is pretty close to impossible to test voltage on the same wire right as it leaves the module, so I settled for it and put everything back together.

The LCM did have EEPROM checksum error, but I am most certain that it went away after I did checksum recalculation.
Since I tested the lights, I did think of two more ways to test if the wire is faulty and if LCM outputs voltage on that one wire.
The LCM connector can be taken apart and the individual wire can be taken out and replaced with test wire.
I could also test the behavior of both wires that receive 2.5V on a working side, and depending on the outcome I can re-pin 0V wire with 2.5V wire.

Until then, any other reasonable speculations or suggestions?

P.S. I did want to try to re-pin tail light connectors just to do swap test, but couldn't find a wiring diagram.
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Old 03-14-2014, 10:47 AM   #7
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Can someone with Eagle Eye LED Tail Lights and multimeter measure the resistance of the soldered resistors?
Although I think I found the source of the problem, I am curious about 15Ohm resistors labeled as 60Ohm
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Old 03-29-2016, 11:33 AM   #8
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Dont mean to revive this thread but have u found a solution? Im having the SAME exact issue with my brand new eagle eye tails. I ready that it could be the resistors and the circuit board inside not having enuff solder. However i dont want to hack in a new resistor box. Khoalty sells new resistors for the eagle eyes but they arent sure if it'll fix this problem. Hope u found a solution
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Old 05-03-2016, 04:23 PM   #9
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Seems to be issue with resistor on the board. I noticed that when the taillight will work for a fraction of a second after releasing the brakes, that is if lights are turned on from control module. Swapping resistor packs did not help so I assume it is the resistor on the PCB. From what I remember, one of them didn't have proper value when I measured it, but I couldn't find a replacement resistor with same size.
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