Just changed the front flasher lamps to canbus LED's on my 2005. Flashing rate is now faster which I know is due to the lower wattage demand of the LED. I prefer not to install a resistor as a fix. Can the stock signal flasher relay be replaced with an LED compatible type? If so where is this stock relay located?
Thanks

 

I would also like to know the P/N for the stock flasher relay.
Thanks

 

Has anyone replaced their stock turn signal relay with a type that is compatible with LED's? I have recently changed my front turn signal lamps with can bus LED's and now the flasher is hyperactive. As previously posted I prefer not to install resistors as a way of compensating for the change in wattage load. I also would like to know the location of the relay.
Thanks

 

It is controlled inside the Body Control Module (BCM). Without a lot of reverse engineering, I'm not sure how it could be fixed. In addition, the bulb outage monitor is looking for that current draw to not trip that lamp in the dash. The only remedy will be a resistor.

 

My thinking is to take the BOM original flasher which I am assuming is similar to an older style thermal flasher type and replace it with a solid state version. The installed can bus led provides the onboard light status surveillance control with light status state input. Hyperflashing is a common condition when converting and there are substitute replacement flashers available. Installing a resistor could involve a lot of location placement searching which I am not interested in doing if I don't have to.
At this time knowing the flasher p/n or its physical location would be helpful in researching a potential replacement. I have not been able to find any documentation showing the flasher p/n and/or its location.
Thanks, Jack

 

It is a digital setup. Not a thermal type like they were years ago. It may be possible to bypass the BCM, and wire in a separate flasher, but would likely be more work than just wiring in resistors.

 

Neil, Thanks for the responses. If you can provide the ID of the stock flasher or its physical location , i.e. fuse box that would helpful. As indicated I have not been able to locate any documentation showing this.
Thanks

 

Neil, I do not think he is understanding THERE IS NO FLASHER.


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Exactly. Most modern cars do notnhave a separate flasher module like older cars did. It's built in as a function of the body control module (computer).

 

You REALLY don't want to hear it, do you?

The flashing of your turn signals (and hazards or four-ways) is a function of the BCM.

Here's a photo of the big box next to the battery and the modules in it. Grab that middle module and perform your fix!
(No, there is no schematic of that module that I know of. I mean, the tuners may have one, but us mere mortals dont.)


Now, here's the page from the always-marginally-accurate-and-always-incomplete POS of a service manual we are given, this is as detailed as it gets.
The "flasher" is in that box called "Body Control Module" down near the bottom of the photo. That's it -that's all they give us.
As you have been told; You may reverse-engineer it but if you do, PLEASE come back and tell us how you did it, cause we cant'/haven't/don't want to try/dont really care.

But if you pull this one off, I'll sticky the thread where you make our day, cause you may not be the only one interested in this - and I'd like to see SOMEONE come up
with more information on the BCM.

 

Thanks Pizza Guy,
I am an engineer but not an EE controls cat. After looking at your attached wiring diagram my thought is maybe one of our expert xfire EE's should be to able to find a way of integrating a standard auto relay within the BCM. A relay with a broad power range (.1 - 150w) would allow LED's and combinations of incandescent and LED's to be used. Has anyone cross referenced the SLK320 turn signal BCM design or is it the same as the xfire?
Thanks

 

Jack
Please help me understand why anyone would want to invest the time to modify the BCM to correct an issue that doesn’t need a correction.

I’m not understanding the win on this modification. What’s the benefit?

 

Dear UrbanE,
Now that I have seen some of the documentation relative to my interest in providing a means to use LED turn signal replacement lights I agree that pursuing the idea of modifying the existing hardware makes no technical sense. I am surprised the configuration used is somewhat archaic when compared to most vehicles which typically use some form of a flasher relay.
End of interest in this subject.

 

The clicking sound comes from behind the instrument panel. That is all I know..