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1996 SVX
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Discussion Starter #1
Several people have asked about interfacing the 2011 OEM camera to an aftermarket HU, as well as connecting an aftermarket camera to the OEM CP635U1 HU.

Hopefully we can determine how the OEM camera works so we can answer those questions.

SVXdc said:
Some 2011 Forester models have the OEM Clarion CP635U1 HU:
2011 Forester Clarion cars101 forester11radio5.JPG
(Subaru Part No. 86201SC630, Clarion Model No. PF-3302B-A).

This has a 4.3" color screen, used to display a rear camera image (as well as showing expanded info for radio, satellite, MP3s, and iPod).

Rear of HU:
CP635U1 rear.jpg

More pictures here: New OEM Radio Installed into MY11 WRX: Source MY11 Forester

Pin-outs of all of the rear sockets on the CP635U1:
Subaru CP635U1 PF-3302B-A rear connectors.jpg

Here is Subaru's wiring diagram for the camera: View attachment 2011 Forester RearView Camera Wiring.pdf

As you can see, the wires run straight between the HU and the camera. There are no connections to anything else in the car. That means the HU provides power for the camera.

Link to Subaru's installation instructions (pdf) for the H001SSC700 camera kit. All work is performed at the tailgate. There is a pre-installed factory harness that runs up to the HU.

This Clarion CP635U1 HU uses the same style of 8-pin socket as the OEM Kenwood Navi HU (the one with the full-size touchscreen, found in some 2009-2011 Foresters and 2008-2011 Imprezas).

2011 Forester camera harness "i146" (plugs into HU):
8-pin plug.jpg 2011 Forester i146 Rearview Camera harness.jpg CP635U1 Camera socket.jpg

Based on Subaru's Forester wiring diagram, we have:
Code:
Pin  Color         Function
===  ============  ========
1   Blue/Yellow   Camera Video signal (+)
2   NC
3   White/Blue    Camera power (+6V DC)
4   NC

5   Grey          Camera ground (shield)
6   Blue/Orange   Camera detect (connect to chassis ground)
7   NC
8   NC
(with pin 5 connected to a braided shield that surrounds the pin 1, 3, and 6 leads).

2012 non-nav models with the camera use the same 8-pin plug and wire colors. On both 2011 and 2012, all of the wire colors change near the camera.

Pin-out for the OEM Kenwood Navi camera socket (as discovered by muzza here):

Code:
Pin  Function
===  ========
1   Video +
2  
3   [Camera power V+]
4  

5   Video ground (shield)
6   Camera detect
7   [Camera power ground]
8
(there is no factory harness, hence no wire colors).

Grounding the 'Camera detect' pin tells the HU that a camera is connected.

A European Legacy owner sent me the service manual for an older (~2008) EUDM Legacy/Outback OEM Kenwood Navi. The pin-out for the camera socket matches what muzza found. Additionally, it shows that the HU provides +6V to power the camera on pin 3 (and does that only when the HU sees the reverse gear signal). It also shows pin 7 is a ground for the camera power (not used by the OEM camera).

I recently helped a 2011 STI owner switch from the OEM Kenwood Navi to an aftermarket HU. I measured +6V on pin 3 on the HU's camera socket. A 2012 owner opened up his CM631UD (which is similar to the CP635U1). The PC board has labels on the 8-pin camera socket that match the above pin-out table (including +6V for power to the camera).

Awhile back, JoeySTi measured +6V on pin 3 when the car was in reverse. That would seem to validate the above pin-out. However, he found odd readings on the other pins (for example, +25V on pin 6). It's possible he was using an auto-ranging meter and didn't realize it had changed to a lower scale.

scarecrow93 measured +3V on pin 6, but saw no voltage on pin 3. [I thought he used an analog meter, but that may have been someone else]

silencery measured +2.85V on pin 6. That matches the voltage I've seen on the detect line for the aux input, so that seems to confirm pin 6 is a camera detect input. He didn't see a voltage on pin 3.

scarecrow93 also saw than pin 5 is tied to the HU's chassis ground. That confirms that the video signal is standard composite. (other information someone sent me had suggested the video signal might be balanced / differential, but I doubt that's the case).


(I'll update this post as we learn more)
 

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1996 SVX
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Discussion Starter #2 (Edited)
I wonder if the CP635U1 HU does not provide the camera power unless it A) sees the enable lead grounded, and B) the car is in reverse (which means ignition is 'on').

Once we confirm the voltage, I think we'll have enough information to safely test connecting the factory camera to an aftermarket HU. However, it would be nice if someone with an oscilloscope could check the waveform and amplitude on pins 1 and 5, to confirm the video signal too.

If you post measurements, say if all the model numbers on your HU are the same (or if any are different than what I wrote in post #1, post yours).

It would be nice to see some clear, close-up pictures of the other end of the camera harness (in the tailgate), and the camera's plug.
 

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2011 Forester XT
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What you are saying then is that 2011 Foresters without a factory installed HU containing a video display have a completely different wiring harness.
 

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2011 Forester Auto
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SVXdc,

Thanks for putting all this together. I don't have access to an oscilloscope, but I'll see if I can't get some shots of the camera harness in the tailgate.

Best,
 

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1996 SVX
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Discussion Starter #5
2011 Foresters without a factory installed HU containing a video display have a completely different wiring harness [?]
As far as the factory camera harness, yes it's likely the different models have different camera harnesses.

I haven't seen wiring diagrams for models that don't have the CP635U1 HU. But I suspect that if there is a pre-installed camera harness, it runs from the tailgate to near the mirror. It's entirely possible that some models don't have a camera harness at all.

It's also possible that models with the CP635U1 have that same harness (from tailgate to mirror), plus an extension from the mirror down to the HU.

The HU's 20-pin power/speaker harness is the same in all 2011 models (except the base models that don't have the phone/Bluetooth SWCs do not have the 3rd SWC wire at pin #13).

In models with the CP635U1, the mic/aux harness has additional leads for reverse gear and parking brake. I'll add that pin-out later.
 

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2011 Forester XT Touring AT
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I wonder if the CP635U1 HU does not provide the camera power unless it A) sees the enable lead grounded, and B) the car is in reverse (which means ignition is 'on')
I'd be willing to bet you're right. Makes sense. If pin 5 is the shield and we theorize pin 6 is the camera enable, I'd also bet that the remainder of the wiring is similar to what muzza posted.

Definitely still need to verify the voltage on pin 3.

Might have to make a trip to the electronics store and see what I can rig up to ground pin 6 to the "extra" ground at the back of the HU.

BTW...I used a digital multimeter. :icon_wink:
 

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and the definitive answer is....

I spent some cash and downloaded the HU's service manual from smpcshop.com and have the definitive pinout for the HU's cam connector (J901).

According to the service manual, here it is:

Pin 1: CV(+)
Pin 2: Cam SW
Pin 3: Cam +5v (other places in the manual refer to this as +6v)
Pin 4: NC
Pin 5: CV(-)
Pin 6: Cam Det
Pin 7: GND
Pin 8: NC

I have the illustration but don't have the required posts to put it up, but these pinouts are letter for letter out of the manual.

Hope this helps ya, SVXdc.
 

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I will be receiving my rear camera kit tomorrow and trying to install it this weekend. On the installation sheet, it indicates the possible need for a trim removal tool, however it is not included as part of the camera kit. For those of you who have installed the rear backup camera, was it necessary to have ? Seems like most of the panels can be removed with sockets or a screwdriver set.

Thanks.
 

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2011 Forester 2.5XP Auto
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switching the video display

I have a question: Does anybody know if I can switch the camera video display from the Tomtom nav HU to the auto-dimming compass? I did not realize when I test drove that getting the tomtom HU changed the camera display. On me for not fully testing it out, I guess, but just never occurred to me. Hate having it on the dash instead of in the mirror, and also absolutely hate the Tomtom HU and want to trade it out, but don't want to lose the camera. Any ideas?

jj
 

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Has there been any more progress on this? I want to go aftermarket but need to know if my rear-view camera will still be functional. The HU I am looking at is the Pioneer AVH-P2400BT


Thank you!
Your HU uses a regular RCA plug to connect the rear view camera signal. I don't think any of the OEM units use RCA plugs, so my guess is that you will at least need a different connector.

Also, aftermarket rear view cameras get power from the backup lights. The the video screen on the HU is also triggered from the same power source. This too might be different on the OEM unit, so it's no simple matter to do what you are proposing.
 

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Discussion Starter #13
I've done a little more research (and updated post #1). I've pretty much confirmed:

  • The OEM camera and HU use a standard composite video signal (pin 1 = signal, pin 5 = ground/shield). This will be the same type of signal that an aftermarket HU wants to see and that most aftermarket cameras provide.
  • The OEM HU provides +6V DC (on pin 3) to power the OEM camera. To connect the camera to an aftermarket HU, you'll need to add a circuit that provides this power.
The last piece that I haven't determined yet is how much current the OEM camera requires on the power pin. Is there anyone with the factory camera who's willing to test this?

If the current draw is low enough, there is an extremely small 6V voltage regulator we can use (the size of a small transistor, about 4mm diameter).

Once we know that, it will be fairly easy to design a circuit that takes +12V from the reverse light signal and drops that to +6V to power the camera.

I already have the 8-pin sockets needed to connect to the factory 8-pin camera harness plug, and can have yellow RCA plugs in a fairly short time. I'm deliberating whether I want to put together a complete solution (with the power converter), or make it a DIY kit with just the 8-pin socket and RCA plug.
 

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Thanks for this Write Up DC, I posted on NASIOC, so you can ignore that post. It looks like my 2012 Impreza Sport Limited has the same radio as the 2011 Forester, so I'll be looking to put in a rear view camera, Thanks for all the valuable info!!!

Thank You!

Bryan.
 

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Hey SVXdc? The OEM camera for Impreza too?

Just curious? Since the Forester and the Impreza share the same radio HU are the cameras the same? Can I use the OEM camera on my 2012 Impreza? Does anyone have the part numbers for the kit, also are there any wires in my tailgate since this was a dealer option? Weird thing that Subaru used the same radio and camera? but it would be cost effective to do this for Subaru.
 

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Camera

Hi all,

Wanted to see if there is an update to this. I have a 2012 STI with NAV and doing the stereo and want to do a back up cam. If I'm reading these post correctly, it looks like I need to get an RCA between the two pins (I forget which they are 5 and 6 maybe) and get power from my backup lights? I'd sure love to get this nailed down. Has anyone done this with success?

Thanks!
 

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I'm kinda interested in this too. I'd like to replace the OEM NAV unit with a Kennwood DNX6190HD. But I'd like to reuse the OEM back up camera PLUS the OEM combo radio/SAT antenna. I've looked up the OEM antenna harness and if you have both radio and SAT radio is splits into two at the back of the HU.
 

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I'm curious to know how to connect the OEM navi to the OEM camera. I have the OEM navi from an 09 STi transplanted into my 09 X that had the standard single CD headunit.
 
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