FAQ
TL;DR: RT3/RT4 video cuts off above 5 km/h, and “The 407 never had a rear view camera.” Auto reverse-camera needs a retrofit trigger and possibly scripting or hardware changes; this FAQ shows wiring, limits, and fixes. [Elektroda, zi.ko, post #17228951]
Why it matters: This FAQ helps Peugeot 407/RT3 owners fix auto-activation and speed-cutoff issues when adding an aftermarket reversing camera.
Quick-Facts
- Peugeot 407, RT3, and RT4 have no factory rear-camera support; retrofits require workarounds. [Elektroda, zi.ko, post #17228951]
- Video is disabled above approx. 5 km/h by design, so images can vanish as the car moves. [Elektroda, zi.ko, post #17228951]
- Auto-switching often uses the short red trigger wire next to the RCA to “wake” video on reverse. [Elektroda, hubert17042, post #17219878]
- Some units labeled RT3 are RT3eV (an early RT4 projection) with different connector expectations. [Elektroda, SZYMON BYDGOSZCZ, #17227559]
- Reports: black‑and‑white and shifted image when auto-triggered after a screen mod; color via menu. [Elektroda, damian2988, post #17260738]
Quick Facts
- Peugeot 407, RT3, and RT4 have no factory rear-camera support; retrofits require workarounds. [Elektroda, zi.ko, post #17228951]
- Video is disabled above approx. 5 km/h by design, so images can vanish as the car moves. [Elektroda, zi.ko, post #17228951]
- Auto-switching often uses the short red trigger wire next to the RCA to “wake” video on reverse. [Elektroda, hubert17042, post #17219878]
- Some units labeled RT3 are RT3eV (an early RT4 projection) with different connector expectations. [Elektroda, SZYMON BYDGOSZCZ, #17227559]
- Reports: black‑and‑white and shifted image when auto-triggered after a screen mod; color via menu. [Elektroda, damian2988, post #17260738]
How do I make my Peugeot 407 RT3 show the camera automatically when I select reverse?
Use the red trigger wire next to the RCA from your camera interface. Feed it with the reverse-light signal so the screen auto-wakes to video. Then verify it switches even when audio or navigation is active.
How-To:
- Tap reverse light wire for trigger.
- Connect to the short red wire near the RCA.
- Test auto-switch in reverse.
[Elektroda, hubert17042, post #17219878]
Why does the image cut out when I start moving?
The system disables video above about 5 km/h. That built-in limit makes the image vanish as you roll forward. On RT4-type setups, people bypass it via scripting changes. This limit is the primary cause of the symptom you described. [Elektroda, zi.ko, post #17228951]
Can I disable the 5 km/h video limit on RT3?
RT3 also has the 5 km/h limiter, but you cannot turn it off with scripts. “RT3 also had a limiter... but here you can not turn it off with scripts.” Hardware or diagnostic-tool approaches may differ by version. [Elektroda, zi.ko, post #17233995]
Does the Peugeot 407 or RT3/RT4 support a factory reverse camera?
No. “The 407 never had a rear view camera, just like RT3 and RT4 never had such a function.” You must retrofit and route triggers externally. “To connect the camera you have to go a little bit around.” [Elektroda, zi.ko, post #17228951]
Which pin on the RT3 head unit triggers the camera input?
There is no dedicated factory camera-trigger pin on RT3/RT4. These units lack native camera support. Use a retrofit interface with a red trigger lead tied to the reverse signal instead. That is why pin-mapping requests go unanswered. [Elektroda, zi.ko, post #17228951]
My unit says RT3, but someone says it’s RT3eV/RT4. What’s the difference?
RT3eV is described as the first RT4 projection. That can change connector expectations and pinouts. If your photo shows an RT4-style cube, plan wiring accordingly. Confirm the hardware generation before choosing a harness. [Elektroda, SZYMON BYDGOSZCZ, #17227559]
Is it normal that my RT3 photo shows no optical fiber in the connector?
A member noted RT3 usually includes fiber, and questioned its absence. That suggests a variant or prior modification. Inspect the installation for earlier conversions. Verify every adapter in the chain before blaming the camera. [Elektroda, zi.ko, post #17233995]
Can a regular garage handle this, or do I need an auto‑electronics specialist?
Because there’s no OEM camera input, you need scripting or hardware workarounds. An auto‑electronics specialist familiar with PSA retrofits is recommended. Ask for experience with RT3/RT4 video enabling and reverse triggers. This avoids chasing wiring that cannot work natively. [Elektroda, zi.ko, post #17228951]
Why is my auto-triggered image black-and-white and shifted, but color via the menu?
One user saw B/W and a shifted frame after a screen modification, yet color when enabled via menu. That points to differences in the auto-trigger path or processing. Recheck the modified screen’s input mode and the trigger interface. Verify the camera and harness involved in the auto-activation chain. [Elektroda, damian2988, post #17260738]
Can I power the camera from the reverse bulb circuit?
Yes, users tap the reverse-light wire to power the camera and feed the trigger. That supports auto activation when selecting reverse. If images drop while moving, the 5 km/h head-unit limit is the cause, not camera power. Stabilize wiring to avoid noise. [Elektroda, hubert17042, post #17219878]
I saw a video where the camera turns on automatically in reverse. Why not mine?
A member concluded that car had a modified installation to enable auto switching. If yours does not, inspect the conversion harness and trigger feed. Confirm the red trigger wire receives the reverse signal at the interface. [Elektroda, zi.ko, post #17233995]
Where can I find connection instructions for this retrofit?
A participant shared a link to a guide with connection details. Review that referenced thread for wiring steps and diagrams. Match your unit (RT3 vs RT3eV/RT4) before applying any pinout. The shared resource was cited as sufficient. [Elektroda, actin, post #17221547]
