Toyota Nation Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter #1
Hi guys,

I recently installed an after market backup camera to my 2013 Camry LE's factory head unit (one w/o navigation). When the system does work in reverse gear, the quality of the video is great.

Now is my problem -- when switched to the reverse gear, whether the ignition key being at ON mode (engine off) or engine revving mode, the head unit sometimes displays the video and sometimes it doesn't. Any advice would be appreciated.

Here's are some details:
1) Important finding -- when the HU does not display the video while on reverse gear, if I wiggle the car key in the key hole and saw the HU (radio) reboots, then almost all the cases I tried, the video does come back.
2) The radio is a Panasonic, model # shown on the front as 57076.
3) The camera's RCA connector hooks up to the HU's 16-pin connector (pin#8 & #16)
4) The backup camera draws power (+/-) from backup light.
5) The HU itself has a Reverse signal fed into the 28-pin connector (pin#2) on the back of the HU. I used a multimeter and checked the voltage is ~12V when in reverse gear and no reading when out of reverse. So no external trigger is needed.
6) I also tried the camera stand alone to a TV monitor, and certainly it works fine so I know it's not the camera issue.

Thanks in advance for help!
 

·
Premium Member
2001 Corolla
Joined
·
488 Posts
Its the ground cable from the camera. Not sure were u bought'the camera from but I believe u got bolt them 2 ground wires coming from camera

Sent from my LG-H811 using Tapatalk
 

·
Registered
Joined
·
6 Posts
Discussion Starter #3
Great point. Which wire should I ground to the vehicle chassis (I mean the "-" power wire to the camera or the RCA "-" shell)? I can give both a try.

I bought my camera from Amazon. Very good quality. Near the H/U side, the wiring only provides a standard male RCA connector and a single short red wire that is supposedly to be used as a trigger (to some vehicles without Reserve Signal In to the H/U. My 2013 Camry does have this input so I didn't use it). As noted above, I hooked up the camera's +/- power supply to the reserve light's +/- leads. No wire(s) being implicitly grounded to car chassis.
 

·
Registered
Joined
·
6 Posts
Discussion Starter #4
OK I figured out the problem. Solution -- the backup camera must be turned on prior to the Head Unit (radio) boots up. This is good news and bad news for me -- good news is that the camera works all the time when in reserve gear; bad news is that it's ALWAYS on, as long as the car is on and normal driving, even not in reverse gear. This will definitely shorten the camera's life for no good reason.

The observation I had before was a fact that -- "if I wiggle the car key in the key hole and saw the HU (radio) reboots, then almost all the cases I tried, the video does come back", that's because when the radio reboots, it'll be able to detect the camera, since at reserve, the camera is ON.

Another trick i can play is, if i switch to reverse gear within about 3-4 seconds following the key at ON position (cranking engine or not), the camera would work. This is so since the boot-up of the radio takes about 4-5 seconds. In other words, it the radio boot-up did NOT detect a camera present, the H/U will ignore this camera function even if the camera is turned on after that.

So long story short, to make it work, I have to power the camera NOT from the reverse light, but from a constant ACC supply. Lucky enough, the camera I bought works fine off the +6V power from the factory H/U. See picture below, Pin #7 on the 16-pin connector, although the camera manufacturer says it requires 12V (70°F temperature today, i'll see if in colder days, what happens).

If anyone can help me if I don't want to keep the camera ON all the time, that'd be appreciated. Really dumb for the H/U (Panasonic Model #57076) that has to detect camera being present only at the boot-up time.


286650
 

Attachments

·
Registered
Joined
·
6 Posts
Discussion Starter #5
Typo -- "In other words, IF the radio boot-up did NOT detect a camera present, the H/U will ignore this camera function even if the camera is turned on after that."
 

·
Registered
Joined
·
4 Posts
If anyone can help me if I don't want to keep the camera ON all the time, that'd be appreciated. Really dumb for the H/U (Panasonic Model #57076) that has to detect camera being present only at the boot-up time.


View attachment 286650
You can add a 6v or 5v relay. Power your camera from an always-on or acc-on line, say from the fuse box with an add-a-circuit adapter, use the +6v line as the trigger. By doing so, your camera will power up the moment the HU boots up, gets detected by the HU, then goes off until you put in reverse which will power the +6V line. The +6V line only has power during boot up or when car's in reverse gear.
 

·
Registered
Joined
·
6 Posts
Discussion Starter #7
Thanks much. I was thinking about using a relay, and your suggestion is a great configuration. However this note you mentioned above is interesting -- "The +6V line only has power during boot up or when car's in reverse gear." If so, then the way i wired will only power the camera at boot up and in reverse gear (since I used the +6V to power the camera and it worked fine as I tested). In other words, my camera will NOT be on all the time. Is this correct? Thanks again!
 

·
Registered
Joined
·
4 Posts
Thanks much. I was thinking about using a relay, and your suggestion is a great configuration. However this note you mentioned above is interesting -- "The +6V line only has power during boot up or when car's in reverse gear." If so, then the way i wired will only power the camera at boot up and in reverse gear (since I used the +6V to power the camera and it worked fine as I tested). In other words, my camera will NOT be on all the time. Is this correct? Thanks again!
That's correct, if you are powering the camera with the +6V line, then it will only be on when in reverse and during HU boot up. In fact, that's how Toyota connect their factory camera which requires 6V. The potential problem is that since yours is rated at 12V, it can work at lower voltage, but sometimes you will see reduced image quality, black and white pictures or even not working at all. If that doesn't bother you, you are good.
 

·
Registered
Joined
·
6 Posts
Discussion Starter #9
Thank you DCF1942... I'll report back if I see any anomalies later on (cold temperature case, image quality deterioration, black screen, stripes, distortion etc...)
 
1 - 9 of 9 Posts
Top