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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Wiring help - Boot handle reversing camera



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      01-11-2022, 08:08 AM   #23
MrSweet1991
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Hi Peeps,

When I did mine it was quite simple, I used a 4 pin fused 12v relay which takes power directly from the battery only when reverse gear is selected, the 4 pins on the relay are:

Accessory (camera)
Ground (tapped from reverse ground or chassis ground near battery)
12v (battery positive)
Switch (tapped from reverse light)

So yellow RCA to headunit for video then the rest is done at the boot

I just found my old thread here

https://www.e90post.com/forums/showthread.php?t=1668165
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      03-14-2022, 08:08 AM   #24
Spartanrob
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Quote:
Originally Posted by pmorg4 View Post
I have an E91 and I used a wireless transmitter receiver for my reverse camera to avoid having to feed wires into the tailgate. You are correct that if you just wire to the reverse light it won't work while the engine is running, the reason is that the car uses pulse width modulation on the reverse light to reduce the voltage. You can code this out in the FRM then it will work perfectly. See the coding forum if you're not familiar with how to code the FRM.
I'm curious about the wireless transmitter you used? Getting ready to wire mine and with the convertible, the wiring is very tricky. Any input you have or a link to the product is appreciated.
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