Has anyone done a CarPlay retrofit / Headunit replacement for 991.1
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tj90 (05-22-2024)
#2898
Rennlist Member
#2899
Burning Brakes
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Yes. What should happen is that when you engage reverse, the brown wire goes hot and powers on the camera. When the camera gets power it sends a signal to the yellow RCA plug and when this signal is received, the HU switches to the appropriate input and displays the image seen by the camera.
#2900
Rennlist Member
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Awesome, you gotta love crowdsourcing the installation manual! Great work guys!!
I still dont understand why Chstek can't give us a cable with a "free end" as part of the loom, but in any case this is going to be a better solution than having a permanent +12V feed to the camera
I still dont understand why Chstek can't give us a cable with a "free end" as part of the loom, but in any case this is going to be a better solution than having a permanent +12V feed to the camera
#2901
Rennlist Member
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Yes. What should happen is that when you engage reverse, the brown wire goes hot and powers on the camera. When the camera gets power it sends a signal to the yellow RCA plug and when this signal is received, the HU switches to the appropriate input and displays the image seen by the camera.
#2902
Three Wheelin'
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Awesome, you gotta love crowdsourcing the installation manual! Great work guys!!
I still dont understand why Chstek can't give us a cable with a "free end" as part of the loom, but in any case this is going to be a better solution than having a permanent +12V feed to the camera
I still dont understand why Chstek can't give us a cable with a "free end" as part of the loom, but in any case this is going to be a better solution than having a permanent +12V feed to the camera
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ZedZed (05-22-2024)
#2904
Burning Brakes
#2905
Intermediate
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You are awesome @ZedZed, @Andy211, @tj90, @mamick and @ratt359…
I’ll pull my CHSTEK out to correct back up camera red wire🤣
I’ll pull my CHSTEK out to correct back up camera red wire🤣
Last edited by Haidang; 05-22-2024 at 03:22 PM.
#2906
Intermediate
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First of all, I would like to thank all of you here for your valuable information in this thread. I really appreciate all the time and effort you all put into this. I also just installed the CHSTEK following your tips and guides, and the new screen is so much bigger than my old PCM!
@Haidang, just wondering, what kind of leather conditioner did you use for your scratches on the dash. I also seem to have scratched the sides a little bit while installing the CHSTEK.
Anybody else with recommendations for this, feel free to chime in as well!
@Haidang, just wondering, what kind of leather conditioner did you use for your scratches on the dash. I also seem to have scratched the sides a little bit while installing the CHSTEK.
![crying](https://rennlist.com/forums/graemlins/bigcry.gif)
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jimmykhs (05-22-2024)
#2907
Racer
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@tj90 Is your car a manual or PDK? I'm guessing the PDK.
I'm just wondering if connecting the camera power to the brown wire on a manual will change anything for the manual cars. That brown wire seems like it is the trigger for the HU to activate the camera on the screen. I'm guessing that it is an incoming feed from the car not an outgoing feed from the HU. How would having the camera powered by that be any different than the camera being powered by a constant 12+ red wire? It doesn't sound like it is the camera turning on that switches the HU to show the camera, otherwise those who have the camera hooked up the red 12+ wire, or to the fuse panel, would show the camera all the time on the HU, not just when in reverse. The only difference with using the brown wire is that the camera itself won't have power to it when it is not being used.
If somebody that has a manual car hooks up the multi-meter to the brown wire and test the reverse, then we could have the answer. Better yet, we would need somebody to test it that has the factory camera setup with it programmed in the car as well as somebody that didn't have the camera programmed in the car to see if that factory programming is what triggers the brown wire on the car in manuals.
Hopefully I am wrong here and all will work as it should for manual cars. Unfortunately, my unit hasn't come in yet so I can't do any testing myself. My current camera on my PCM3.1 has power feeding it all the time (thru the fuse panel) and the car (canbus?) is telling the HU when to show the camera, not the RCA from the camera.
Does anyone here have a manual car and have the backup camera working? If so, how do you have it hooked up?
I'm just wondering if connecting the camera power to the brown wire on a manual will change anything for the manual cars. That brown wire seems like it is the trigger for the HU to activate the camera on the screen. I'm guessing that it is an incoming feed from the car not an outgoing feed from the HU. How would having the camera powered by that be any different than the camera being powered by a constant 12+ red wire? It doesn't sound like it is the camera turning on that switches the HU to show the camera, otherwise those who have the camera hooked up the red 12+ wire, or to the fuse panel, would show the camera all the time on the HU, not just when in reverse. The only difference with using the brown wire is that the camera itself won't have power to it when it is not being used.
If somebody that has a manual car hooks up the multi-meter to the brown wire and test the reverse, then we could have the answer. Better yet, we would need somebody to test it that has the factory camera setup with it programmed in the car as well as somebody that didn't have the camera programmed in the car to see if that factory programming is what triggers the brown wire on the car in manuals.
Hopefully I am wrong here and all will work as it should for manual cars. Unfortunately, my unit hasn't come in yet so I can't do any testing myself. My current camera on my PCM3.1 has power feeding it all the time (thru the fuse panel) and the car (canbus?) is telling the HU when to show the camera, not the RCA from the camera.
Does anyone here have a manual car and have the backup camera working? If so, how do you have it hooked up?
#2908
Three Wheelin'
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@boxdriver Its neither PDK or Manual. Its a 2016 Cayenne automatic. You bring up a good point - probably worth the investment to probe the two wires as I have done to verify your particular situation. You are being a trail blazer in this endeavor and assuming all the risk. It was literally a 5 min operation to probe those two lines with the DMM and check to see if/when that brown line is energized. Its useful for debug because you verified function before cutting and splicing. When I wire my camera, I will be tapping off that brown wire and using an in-line fuse before wiring directly to camera. The power consumption is minuscule for the camera (3W?) so a fuse very low amperage (1-2A) will do the trick.
The advantage of hooking the camera to a switched power source is longevity of the camera itself. Yes, you could leave it on 100% of the time with the red lead, but from what Ive read is less than ideal. Not sure why really, CCD cameras are on 100% the time all over the place.
You suggested that the brown line is acting like a sense line or trigger. That would indicate that some sort of relay/switch circuit is being used. The switch is already in the car so not sure why they would have 2 switches? I doubt it as its redundant, increases circuit complexity and its not high power.
The advantage of hooking the camera to a switched power source is longevity of the camera itself. Yes, you could leave it on 100% of the time with the red lead, but from what Ive read is less than ideal. Not sure why really, CCD cameras are on 100% the time all over the place.
You suggested that the brown line is acting like a sense line or trigger. That would indicate that some sort of relay/switch circuit is being used. The switch is already in the car so not sure why they would have 2 switches? I doubt it as its redundant, increases circuit complexity and its not high power.
Last edited by tj90; 05-22-2024 at 05:38 PM.