Closest wire tap for rear view cam query - C3 tap on the 02 bose radio harness - Page 2 - Mercedes-Benz Forum
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post #11 of 15 (permalink) Old 05-11-2019, 09:42 AM Thread Starter
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Originally Posted by mattml430 View Post
Just use the power from the reverse light. It’s so easy to get too.
I agree don’t go wireless they are not as good as hard wired.


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So last night, my son hardwired his rear view cam using the reverse light power. He did an A1 job of concealing the wiring.

Before closing things up, he tested it and works fine going into reverse, however, when I tested it this morning, I notice a slight flicker on the HU display. I have a similar one wired up on the w202 and no flicker.

I read thru some info on the flicker issue on the mb rv cam viewing and others attributed it to the way MB set up the voltage signal that goes thru the wires for the keeping a check on any bulb burnout issue. A 'pulse' signal that still shows as 12V going thru a multi-meter, but on an oscilloscope, the signal shows as square sign waves. This pulsing is what causes the slight flickering (the faint horizontal lines) on the RV display vs. a crisp image.

As anyone corrected this with the use of either a capacitor or relay at the back to correct this issue?

Comments appreciated.
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post #12 of 15 (permalink) Old 05-11-2019, 10:09 AM
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Originally Posted by khomer2 View Post
So last night, my son hardwired his rear view cam using the reverse light power. He did an A1 job of concealing the wiring.

Before closing things up, he tested it and works fine going into reverse, however, when I tested it this morning, I notice a slight flicker on the HU display. I have a similar one wired up on the w202 and no flicker.

I read thru some info on the flicker issue on the mb rv cam viewing and others attributed it to the way MB set up the voltage signal that goes thru the wires for the keeping a check on any bulb burnout issue. A 'pulse' signal that still shows as 12V going thru a multi-meter, but on an oscilloscope, the signal shows as square sign waves. This pulsing is what causes the slight flickering (the faint horizontal lines) on the RV display vs. a crisp image.

As anyone corrected this with the use of either a capacitor or relay at the back to correct this issue?

Comments appreciated.
Do you have a good ground on the reverse cam?

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post #13 of 15 (permalink) Old 05-11-2019, 10:50 AM Thread Starter
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Do you have a good ground on the reverse cam?

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Grounds at the rear cam are good.
First thing I had checked.
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post #14 of 15 (permalink) Old 05-12-2019, 02:37 PM Thread Starter
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This morning, my son went ahead and installed a relay switch, as described in many threads and online, in our attempt to resolve the fine noise horizontal lines in the rear view cam display when the suv is in reverse. Checked and double checked the wiring was correct. Even found another source of ground (wiring) in the loom and tested it.

No improvement.

Rear view is OK except for the fine noisey horizontal lines, but it should be crystal clear.

Going to try a rectifier later this week.
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post #15 of 15 (permalink) Old 05-13-2019, 06:38 AM
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Quote:
Originally Posted by khomer2 View Post
This morning, my son went ahead and installed a relay switch, as described in many threads and online, in our attempt to resolve the fine noise horizontal lines in the rear view cam display when the suv is in reverse. Checked and double checked the wiring was correct. Even found another source of ground (wiring) in the loom and tested it.



No improvement.



Rear view is OK except for the fine noisey horizontal lines, but it should be crystal clear.



Going to try a rectifier later this week.
The camera is NTSC, not PAL, correct? Did you check the camera outside the truck with another video monitor?

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