I'd mentioned earlier that my shop foreman asked if I'd "coded" my X5 after I'd installed the factory hitch and towing light control module. Well, he checked the coding today and the ECU hadn't yet recognized that the module was installed, even after towing over 750 miles. So he coded it to now recognize the module. Guess what? The blinkers don't flash faster with a trailer hooked up like they did before.

For others who've said that they also have the fast blinkers with their trailers, might want to have the coding checked.

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R