Back-Up Camera/BLIS Issue

[RangerBill]

Gotcha I will go look. Side note, where are you getting the electrical diagrams? I searched for some on google for the ranger and couldn't find one like you have there. And good idea on the tailgate connector, I haven't ever taken that off but I also haven't checked it. Will report back.

I purchased a CDROM from Helm Inc. that has the shop manual and electrical diagrams.

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[MiataBro11]

I purchased a CDROM from Helm Inc. that has the shop manual and electrical diagrams.

Nice! I will look into that, it would be super useful to have...

 

[airline tech]

True:

The Ground Point for the BLIS L/R and the Plate Lights share the same ground, but the camera uses a different ground point.
Note: it is a possibility that the circuit disruption is causing the camera issues, but with the fault codes you have tells me you have a power issue.
Since there are not any related codes relating to the rest of the system circuit, then that possibly rules out any short in the circuit.

Other items on that Power Circuit:
4x4 Switch Module / IPMA / CCM, use the same power source but are not running through the connector C408, they are branched off via (Splice) upstream of the C408 connector

Now if we can only locate (C408) physically as I suspect power not getting past that connector
Another main power source that runs through the connector is the Fuel Pump (In-Tank)
so, as a potential guide, find the harness that feeds the Pump Module (just above the spare tire) and the Pump (on top of the tank) and follow it forward.

This should be connector C408 as it is the next connection point.

Note: There is (1) connector between the Module & Pump, that feeds the pump motor from the module, so it splits off (in-between) the 2.
The other branch should run forward towards the fuel pump and C408 should be located forward of the pump and tank (on the left) frame area.
I would have to check, but it may possibly be running inside the frame itself.

 

[airline tech]

C408 Location Possibilities:
Ref: Long Range American Tank (Pic)

The connector (along the inside of the frame rail)

Ref: The video for possible C410 Location as it's before the Pump but might be C408
C410 is the connector in between the Module & Pump

In the video I believe he is disconnecting C410, note the harness splits in the video, just follow that harness forward to the next connector, that should lead you to C408

Ranger install video .m4v - Google Drive

 

[MiataBro11]

C408 Location Possibilities:
Ref: Long Range American Tank (Pic)

The connector (along the inside of the frame rail)

Ref: The video for possible C410 Location as it's before the Pump but might be C408
C410 is the connector in between the Module & Pump

In the video I believe he is disconnecting C410, note the harness splits in the video, just follow that harness forward to the next connector, that should lead you to C408

Ranger install video .m4v - Google Drive

I think the grey connector in your picture is correct. I will trace the harness by hand when I get home, but going off of that video I am 95% confident that the grey connector on the frame rail is C408. From the video here is the fuel pump connector:

Following that forward in a different shot leads us to that grey connector:

Now the confusing part then is that means I already pulled, checked, and cleaned C408 in post #11... I didn't see anything wrong with the pins or anything.

Also just wanted to say thank you for the help you guys have provided so far, I appreciate it! ?

 

[MiataBro11]

Got under the truck and confirmed those two large connectors on the inside of the frame rail are the same harness as the fuel pump. Both of those I already pulled, checked, and cleaned. I ordered one of the OEM Ford wiring diagram books but that won't be here for a few days. I started checking other related things and pulled the license plate lights and actually found a problem. They definitely have had water in there and some dirt and grim too...

The filament of both bulbs is intact but the "connector" portion of the bulb on both of them seems to have shorted to the truck connector and melted off.

Can anyone provide me the wiring diagram with the license plate lights on it?

 

[MiataBro11]

Better picture after cleaning out the connector, the one side is just completely gone on both connectors.

 

[RangerBill]

Can anyone provide me the wiring diagram with the license plate lights on it?

 

[airline tech]

Good find:

I think I see what is happening here:

The License Plate circuit and BLIS share the same Ground Point G401
The License Plate, connector is shorting to Ground, now is is just the connector or is the wiring shorted together somewhere is unknown- most likely just the connector.

So, this short to ground is affecting the Ground Point for all that is on that Ground Point.
Which is only the Plate Lights & BLIS (L & R)
The taillamp lighting circuit including the High Mount Brake Light, uses G123, a different ground point.

The tie in for the Rear Camera and this issue is the MS-CAN Bus communication.
The BLIS circuit triggers on (cross traffic) alerts when it sees a Gear Input to Reverse.
The BLIS circuit is shorted due to the license plate lights, therefore cannot trigger on (cross-traffic)
this error is causing the rear camera not getting a proper gear position signal to display when in reverse.

 

[airline tech]

Part Number is the same Left / Right - Pigtail for The License Plate Lights

 

[airline tech]

Sorry, forgot to add

The park lamps power circuit also feeds the High Mount Stop Lamp, so the License Plate Lights are most likely causing that code as well. - B1115:15

So now it's down to what caused the issue:

1. Water in the Plate Light Connections - shorted and burned the connector and possibly wiring

2. The Ford Brake Controller - Shorted or Wiring To / From, shorted the circuit and the License Plate lights got shorted from it. (Burnt Contacts)
If this is the case, without digging into it, I would think that the Brake Light input could be bleeding over into the License Plate lights.
I would have to see how the Ford Brake Controller is actually wired up to the High Mount Stop Light circuit to possibly pinpoint the cause (if this scenario is true)

 

[airline tech]

Ok, I know how its wired now
Power and Trailer Connector are tapped and fed to the module
Module gets tapped to the 3rd Brake Light - for brake light power as a signal for control

I think it is a good idea to check the rest of the connectors on that circuit for similar issues
Both Taillamp assemblies and the 3rd Brake Light as this may not be just the License Plate lights that have burned contacts.

 

[MiataBro11]

Ok, I know how its wired now
Power and Trailer Connector are tapped and fed to the module
Module gets tapped to the 3rd Brake Light - for brake light power as a signal for control

I think it is a good idea to check the rest of the connectors on that circuit for similar issues
Both Taillamp assemblies and the 3rd Brake Light as this may not be just the License Plate lights that have burned contacts.

I highly appreciate all your efforts! I will get two of those connectors orders, thanks for the p/n. Both of those connectors had quite a bit of water in them when I pulled them so I suspect that is what caused the short. For now I will cut off the connectors to eliminate the possibility of the connectors themselves causing the short. I will also get eyes on G401, if there is still a short to ground on the circuit I should seel voltage at that ground correct? I can also pull the 3rd brake light and check that connector.

 

[MiataBro11]

Plate light connectors cut off, I have continuity to ground on both black wires but no voltage on the yellow/violet wires with key on, lights on. Looking at the diagram @RangerBill provided I don't see what fuse powers these. I also pulled the tail lights and the connectors on both of them look fine with all pins perfect.

I can pull the 3rd brake light if needed but I kinda forgot about the cap on my bed making access to that basically impossible without removing the cap. With the plate light connectors removed and no voltage on the power side, I'm not sure why the BLIS modules would still be not working if the issue was a short to ground in the plate light connectors. Thanks again guys for all your continued help

 

[RangerBill]

Plate light connectors cut off, I have continuity to ground on both black wires but no voltage on the yellow/violet wires with key on, lights on. Looking at the diagram @RangerBill provided I don't see what fuse powers these. I also pulled the tail lights and the connectors on both of them look fine with all pins perfect.

If your left-hand front and rear parking lamps work, you have power to the Body Control Module to power the license plate lights, as they are all powered from the "hot at all times" power feed.

If you don't have a bulb connected to provide a load to the wire that you are testing for voltage, the BCM might cut power to it, so you may not be able to measure a voltage. I am not sure of this though.

I was wondering if BLIS will work if the rear camera is not working. They may be tied together in the programming so all three (two BLIS modules and rear camera) have to function together. Again, I am not sure of this.

Have you checked the tail gate wiring plug for proper connection as this supplies connections to the rear camera.

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