Use this article if…
- Several cameras fight for the display (reverse should win but doesn’t, front sticks on, etc.).
- Single feed, wrong image → Picture troubleshoot. Physical setup → Front & multiview.
Quick answer
When reverse does not override as expected, open the headunit’s reverse-priority settings and simplify triggers so two sources are not fighting one input - then retest gear changes with only one live camera at a time.
Problem
- You need predictable switching between multiple camera views.
Symptoms
- Reverse does not override when expected.
- Front cam blocks reverse view.
Cause
- Headunit logic may favour front or aux over reverse when more than one live video path exists.
Fix Step-by-step
- Sketch a truth table - Park + front button → front; any reverse → reverse; ignition off behaviour - write it before wiring.
- One electrical meaning per trigger - Reverse sense only in reverse; front override only from its switch/input. Common mistake: diode-OR two +12 feeds into one camera sense - the headunit can’t tell what you meant.
- Menu: reverse priority / timeout - Force reverse-on-top; shorten front multiview timeout if the manual allows - stops “stuck front” over reverse.
- Isolate video streams - Enable “close aux on reverse” (wording varies) so the decoder isn’t blending two live feeds.
- Road-cycle test - Standstill: manual front on → shift reverse → back to Drive - reverse must preempt every time.
- Trailer harness check - Back-feed on reverse pin can fake a permanent reverse - meter with trailer disconnected.
Field scenarios
- LED tail upgrade + cheap trailer tap: pulsing sense keeps front cam latched.
- Wireless front transmitter left powered - always-on stream blocks reverse handoff.