Use this article if…
- You are wiring cameras to the MK4 the first time (install guide - not symptom-led).
- You want a camera (front, side, or cabin) running full time, not only in reverse.
- Something fails after install → MK4 camera troubleshooting. Other headunits → Cameras hub.
Quick answer
MK4 camera installs go wrong fastest when AHD/CVBS does not match the camera or reverse sense comes from a PWM tail tap - set format to the camera, meter trigger at the MK4 loom, and fully latch any 28-pin style adapter.
Want a camera running full time, not only in reverse? The reverse input only shows while the car is actually in reverse, so wire that camera to the front camera input or the aux video input instead, then select it from the headunit source button and leave it on as long as you like.
Problem
- You are wiring reverse and extra cameras to the MK4 the first time.
Symptoms
- Multiple camera inputs to assign and AHD vs CVBS to choose on first wiring.
- Unsure how factory reverse integrates on your chassis year.
Cause
- 2023+ facelift LC76 factory reverse paths differ from older dealer-fitted cameras.
- 28-pin style integrations need a solid +12 V reverse sense - PWM tail taps often fail.
Fix Step-by-step
- Assign reverse / front / aux inputs in headunit settings (if something still fails, use camera troubleshooting).
- Running a camera full time, not just in reverse? The reverse input only displays while the car is in reverse, so do not use it for an always-on view. Wire that camera to the front camera input or the aux video input instead, then select it from the headunit source / camera button to keep it on continuously. Reverse will still take priority and override it the moment you shift into reverse.
- Set AHD or CVBS to match the camera hardware.
- 2023+ facelift LC76 factory reverse: use approved configuration.
- Earlier dealer cameras may need adapter harnesses.
- Route AutoChimp-style looms away from heat and steering.
- Meter reverse trigger at the headunit end - avoid PWM tail taps; no switch in reverse? No reverse display.
Notes
- Fault finder: Camera troubleshooting (overview)
- Black picture: Reverse black screen
- Harness: Power / speakers
- Fascia: Install fascia
- Broader camera help: Cameras hub