Use this article if…
- You are wiring cameras to the MK4 the first time (install guide - not symptom-led).
- 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.
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).
- 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