mush
New Member
Posts: 11
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Post by mush on Jul 14, 2022 16:19:40 GMT
I am starting a project to install led emblem in Audi A3 2018 model. I have matrix headlight. does any one have information about the pin of headlight connector? I want the emblem to light up when DRL are ON also when main headlight lamp are ON. I thinking to use a contactor relay of 12 volt and make OR function to make with work with both light.
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Post by dv52 (Australia) on Jul 15, 2022 1:26:49 GMT
mush : It really does depend on which type of "matrix headlight" you have installed (there are a few different OEM options - different PR numbers) and which country model - but, in general there are 2 x separate functions for the DRL lamps on each side of the car; the power supply function to the DRL LEDs and the signal function for the DRL LEDs. Again, as a general rule, the set-up on the 14 x pin headlight connector is like this:
- Pin #10 = DRL LED Power Supply
- Pin # 11 = DRL LED Signal
So, I assume that the DRL Lamps (different to the DRL function) on your car are illuminated when the DRL function and when the low-beam lamps are switched-on. If so, splicing into one of the 2 x pins above with a high resistance relay coil will work for your needs.
My preference would be to use the DRL LED Power Supply (pin #10) because sometimes the factory setting on the DRL LED Signal pin is dimmed for low-beam ON operation.
Before you commit to my suggestion, I suggest that you grab a multi-meter and test the voltage on pin #10. The supply voltage will have an embedded PWM frequency - but you should measure rail voltage when DRL & Low-beam are operational.
Again, before you make any permanent modifications to the car - I suggest that you temporarily connect the relay coil to this pin and test operation - as proof of concept
Don
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mush
New Member
Posts: 11
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Post by mush on Jul 29, 2022 12:45:38 GMT
Thanks a lot Don for sharing the details. I will check as you advise and update the blog with the final results.
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