Now, the front camera should be powering up properly! But we still need to get the rear camera in place.
Connect the rear camera cable to the front camera. We’ll route the rear coaxial cable along the headliner, past the A, B, and C pillars on the passenger side. Thankfully, this part is more straightforward, though a bit more challenging with European vehicle’s thin trim. Using a Trim Tool or other device to get in there can prove helpful, and BlackVue’s thin coaxial cabling is a blessing.
Following from here, we’ll eventually reach the rear windshield, which thankfully has no liftgate like more difficult hatchbacks, as the BMW M3 is a standard Sedan. Still, there is a spot of difficulty, as the BMW M3 does have a large brake light at the center of the rear windshield.
With BlackVue’s wide-angle viewing, you could mount the rear unit to either side of this brake light. But for ideal coverage, we opted to mount it right at the bottom center of the brake light. This means we had to follow the cable along the trim of the vehicle, and carefully run it along the trim of the brake light itself.
Same as the front camera, you’ll want to check the live-view of the rear camera before mounting, making sure it’s up and running, and using the positioning lines accordingly.