Use this article if…
- Several cameras are fighting for the display: you want reverse to win but it doesn't, or the front sticks on.
- Single feed, wrong image: Picture troubleshoot. Physical setup: Front & multiview.
Quick answer
If reverse doesn't override the way you expect, open the reverse-priority settings on your headunit. Simplify your triggers so two sources aren't fighting one input. Then retest your gear changes with only one live camera at a time.
Problem
- You want predictable switching between multiple camera views.
Symptoms
- Reverse doesn't override when you expect it to.
- Your front cam blocks the reverse view.
Cause
- Your headunit's logic may favour front or aux over reverse when there's more than one live video path.
Fix Step-by-step
- Sketch a truth table: park plus the front button gives front, any reverse gives reverse, and set what you want with the ignition off. Write it down before you wire anything.
- Give each trigger one electrical meaning: reverse sense only in reverse, front override only from its switch or input. Common mistake: you diode-OR two +12 feeds into one camera sense, so your headunit can't tell what you meant.
- Set reverse priority and timeout in the menu: force reverse on top, then shorten the front multiview timeout if the manual allows it. That stops the front sticking once you're in reverse.
- Isolate the video streams: turn on close aux on reverse (the wording varies) so the decoder isn't blending two live feeds.
- Run a road-cycle test: at a standstill, switch the front on manually, shift to reverse, then back to Drive. Reverse has to preempt every time.
- Check the trailer harness: back-feed on the reverse pin can fake a permanent reverse, so meter it with the trailer disconnected.
Field scenarios
- An LED tail upgrade with a cheap trailer tap: the pulsing sense keeps your front cam latched.
- A wireless front transmitter you left powered: the always-on stream blocks the reverse handoff.