Trailer Aux 2 works but Aux 1 doesn’t

[Ray Payne]

After installing wired cameras (downgraded to one camera), I found Aux 1 just gives a blue screen, but Aux 2 works. Would anyone have any idea why this would be the case? I want to make sure I’m not missing the obvious before going to the dealership to try to fix it since I know they don’t carry the Ram cameras locally. My non-Ram cameras are mounted to the RV and it’s not likely they will want to take that in to debug.

 

[lbg112]

After installing wired cameras (downgraded to one camera), I found Aux 1 just gives a blue screen, but Aux 2 works. Would anyone have any idea why this would be the case? I want to make sure I’m not missing the obvious before going to the dealership to try to fix it since I know they don’t carry the Ram cameras locally. My non-Ram cameras are mounted to the RV and it’s not likely they will want to take that in to debug.

I came across this thread a while back, hope it helps

2020 Ram Auxiliary Camera

Has anyone purchased a 2020 Ram with the trailer camera wiring? My new Ram has one plug for the auxiliary camera. I am trying to determine how that feature supports 2 cameras as advertised.

www.ramforum.com

From the forum:

For what it's worth, I will share my experience with the trailer camera and harness. I hope it answers some questions I had.

The truck is a 2020 Ram 2500 with fifth wheel prep, and it came with the camera harness pre-wired. There is a camera hookup in both the bed and tailgate.

I bought the dual camera part from store.mopar.com, which comes with one camera only and a second connector for a second camera that you purchase separately.

I connected the camera to the tailgate connector and got no image for either Aux1 or Aux2. Connected it in the bed, it worked fine on Aux1.

After fruitless searching, I finally ran across a post elsewhere that said the tailgate had been disconnected and the connector in the bed was plugged in instead. Sure enough, the camera connection on the tailgate has about 18" of wire that ends in a connector and was not connected to anything.

One has to assume that Ram decided that you would not use the tailgate connector if you had the 5th wheel prep.

Further, there is no Y- cable offered to allow the use of either connection without crawling under to change the connection back to the bed.

The tech that worked on it did offer to make a Y-cable for me, so I will probably do that so I can use either connection.

I consider it rather stupid of Ram to disconnect one without letting the dealer or customer know.

 

[Ray Payne]

The odd thing is my Aux 2 works on both the bumper and in the bed. So my 2020 seems to have a Y connection. The only reason I know both work is my whole 12” screen went dead after I parked the fifth wheel. I backed up to the trailer again and plugged the cameras into the bumper, then restarted the truck. The trailer camera was working (aux 2 still because of the pins connected), then I selected the 360 camera, disconnected the trailer, and with the display still active turned off the truck. Then the display was fine again. So I am fairly certain the firmware is less than bulletproof.

 

[Ray Payne]

This is what the installer saw on Aux 1 at the only time it wasn’t coming up with the blue screen. In case that blue / green pattern gives anyone any clues.

 

[Brutal_HO]

Double, triple check the wiring pinouts at all points.

14 pages, but much of the info is here in the sticky thread: https://hdrams.com/forum/index.php?threads/towing-technology-group.180/

This is a work in progress and doesn't copy/paste well from excel... Pins 9/10 are definitely AUX1, I have to double check AUX2 as I've slept since I did this.

PIN >>

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FORD Truck Side 12-Pin

1 VT/BN

2 VT/GN (TTPMS)

3 GY/VT (TTPMS)

4

5

6 WH (TTPMS)

7

8 BK

9 GN/BU

10 VT/GY

11

12

Pin 1 splits 1>2 wires at loom split and supplies power to both Ford plugs

FORD 6-pin Camera plug

1

4

2

3

Molex MX150 series single row 6-pin(Wire/male pin end) 33481-0624 (Cap) 33471-0631

Pins 2,3 STP and taped

FORD 4-pin TTPMS plug

1

3

4

2

TE Connectivity MQS (Wire/female pin end) 1534192-1 (shroud) 1-967640-1 1-968400-1 (Cap) 1-9675843-3

Pins 3,4 UTP (intended for TPMS receiver)

RAM 12-Pin

Red Power

BK Common GND

BN Aux 2 Shield

GY Aux 1 Shield

GN AUX 1 Signal

WH AUX 1 Return

BU AUX 2 Signal

YE AUX 2 Return

Harness 68382533AB (not available for purchase outside kit)

RAM AUX 1 Camera lead

1

6

3

4

5

AUX 1 Radio Header Signal pin 21 Return pin 22

RAM Aux 2 Camera lead

1

6

3

4

5

AUX2 Radio Header Signal pin 24 Return pin 25

XFQ kit pinout for 2019 single camera



Plug pins (confusing isn't it?) I don't know what ******* did this, but it's the dumbest thing I've ever seen and follows no real logic that I can decipher.



Pic below courtesy of @Phil T

 

[Brutal_HO]

The odd thing is my Aux 2 works on both the bumper and in the bed. So my 2020 seems to have a Y connection. The only reason I know both work is my whole 12” screen went dead after I parked the fifth wheel. I backed up to the trailer again and plugged the cameras into the bumper, then restarted the truck. The trailer camera was working (aux 2 still because of the pins connected), then I selected the 360 camera, disconnected the trailer, and with the display still active turned off the truck. Then the display was fine again. So I am fairly certain the firmware is less than bulletproof.

I'm guessing incorrect wiring...

 

[Ray Payne]

Thanks for that. I'll have to check the pinout paper in the box from Nichols to your mapping above. I did skim through there and did a search, but other than the pinout being off I wasn't sure if there was something else up. I know from the labels put on the plug from Nichols, all of the labels for which wire is which pin match your table. I'll double-check with a meter though to see if maybe a pin was transposed for the mapping or something.

 

[Ray Payne]

Pinouts seem correct. I’m wondering if there is something not wired correctly in the truck from the factory…

 

[Brutal_HO]

Worth a shot. Someone else had a funny image and I believe he just had the leads on the camera wrong.