Electrical For discussions regarding wiring up electrical modifications such as radar detectors, brake light mods, power sockets, and driving lights in Clubman (R55), Cooper and Cooper S (R56), and Cabrio (R57) MINIs.

Electrical Doing the "add rear fogs into the brake light mod"

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Old Oct 3, 2009 | 01:07 AM
  #1  
Bruce/Fl's Avatar
Bruce/Fl
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Doing the "add rear fogs into the brake light mod"

and am running into a small annoyance.

I went the "change the rear fogs to LED's so as to give a minimal load to the Brake Control Module (BCM)" route (instead of adding in a relay and related wiring) so as to try to reduce as much as I could the possibility of knocking out the BCM, and have run into a glitch. The car electronics has picked up the difference and I am getting a triangle and a rear fogs warning everytime on start up. I remember reading somewhere that you could add a resistor to the circuit to get the "load" right.

I got out a multimeter at work to see that the difference was in resistance between the two bulbs, the factory and the replacement LED, the factory came in at about an ohm, but when I tried to get a reading on the LED I couldn't get a reading. It was reading it wide open, just the opposite of what I expected.

Anybody run into this before? Any thoughts/ideas?
 
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Old Oct 3, 2009 | 09:38 AM
  #2  
schatzy62's Avatar
schatzy62
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From: Gardner MA
What you are reading on the bulb is correct. What you are reading on the LED is teh reading in one direction, if you hook up the ohm meter in the opposite direction it will read lower but still much higher than the regular bulb.

What you need is a resistor to add in parallel with the LED so that the cars systems believe there is a bulb there not the LED.

If you search the threads here you will find that many peopel have run into this same problem and those threads have the different resistors that people have use to solve the porblem.


Now as for what you are trying to do I am not sure. What is it that you wish ot accomplish?

Also there is not a Brake Light Conrol Module in any of the gen 1 or gen 2 mini's. In Gen 1 cars the Genreal Control module handles the brake lights and the fog lights but they are 2 completely seperate circuits so reduing the load on the Fogs does nothing for reducing the load onthe brake light section. On the Gen 2 cars the Footwell Control Module controls the fog and brkae lights and yet again they are two seperate circuits so reducing the current draw on one does nothing for the other.
 
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