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Using Rear Fog Light Switch to Operate Angel Eyes
Rear Fog Light Switch to Trigger Angel Eyes Objective: To retrofit the BMW European rear fog light switch into a The first step in the project was to obtain the BMW light switch module that has the rear fog light switch. The switch for my particular application is part number 61 31 8 380 255 (note that if your X5 is a newer model that has automatic lighting then your part number will be different). Unfortunately, this is not a simple plug-and-play swap of the old switch because the wiring harness and LCM on the U.S. spec vehicles are not wired or pinned to accommodate the rear fog lights. Figuring this out took a little bit of time and reverse engineering with a digital multi-meter. The end result of this analysis determined that the fog light switches use a pulsed negative trigger in order to signal the LCM. On the original switch the front fogs uses Pin 9. For the new switch, I determined that the rear fogs use Pin 8. Pin 7 - Common / Ground Pin 8 - Rear Fog Trigger Pin 9 - Front Fog Trigger Unfortunately for us in the Now that I had a known signal output from the rear fog switch in the form of a negative pulse output, the next step was figuring out how to transform that signal into something that could be used to operate the Angel Eyes. The solution I used is the PTR7 from Peripheral Electronics - http://peripheralelectronics.com/periph_products/cd_changer_autos/instructions/ptr7.pdf which is a programmable trigger output module. I used mode 3, which takes a pulsed input and sends a latched output to the relay that I use to power the Angel Eyes. For this application I used the following wiring assignments: PTR7 Red wire - Switched 12V power Black wire - Chassis ground Brown wire - to pin 8 on the BMW rear fog switch White wire - to the relay used to power the Angel Eyes (negative trigger) |
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