(Resolved) Restraints Indicator Lamp Warning, Radio and Climate Physical Buttons (FCIM) not working, No Outside Temperature, No Start/Stop

[airline tech]

When you had the panel off - did you remove and reinstall the 2 connectors on the panel?

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[isthismyusername]

Yes, however I did not check to see if anything was receiving power. Both appeared to be firmly in place

 

[airline tech]

I have a strong hunch - Power is fine, and the MS-Can Bus is dead / shorted.
There are multiple modules on that circuit (com) but a most likely suspect module is the BLIS module in the Taillight - pull the lights and disconnect both taillight connectors, inspect for water in the lights.
Power the truck up and see if the FCIM comes back on - with the lights disconnected.
If it does - reconnect the taillights (one side at a time) to isolate which side is taking the circuit down.
These are the most likely fault location for the MS-Can Bus.

 

[airline tech]

Another easily accessible module is the TRM (Trailer Module) located on the Passenger Side kick panel - under the TCU.
You may try - disconnecting the TRM and see if the FCIM comes back
On the road trip - were you towing anything?

The other module that is on the MS-Can bus is the RTM (Radio Transceiver Module) but it is mounted above the headliner.
The FCIM is the (terminating) module in the MS-Can network, so if is has lost power it can take the circuit down.
But in the meantime, while waiting for the OBD Connector, you can do some possible isolating of modules (faulted) for the MS-Can side of this issue.
May or May Not -help, but if I am correct - I have a strong hunch that the issue is one of the BLIS modules shorting out the MS-Can bus.

 

[isthismyusername]

Another easily accessible module is the TRM (Trailer Module) located on the Passenger Side kick panel - under the TCU.
You may try - disconnecting the TRM and see if the FCIM comes back
On the road trip - were you towing anything?

The other module that is on the MS-Can bus is the RTM (Radio Transceiver Module) but it is mounted above the headliner.
The FCIM is the (terminating) module in the MS-Can network, so if is has lost power it can take the circuit down.
But in the meantime, while waiting for the OBD Connector, you can do some possible isolating of modules (faulted) for the MS-Can side of this issue.
May or May Not -help, but if I am correct - I have a strong hunch that the issue is one of the BLIS modules shorting out the MS-Can bus.

Tested the taillights to no avail. Also unplugged and replugged in a few of the other connectors towards the back underside. I’ll try the TRM now, I was not towing anything at the time. Initially it appeared the Airbag warning came on around the same time the passenger seat was reclined, could’ve been a freak coincidence along with the air going out a few hours later. All connections under the seat look fine with no pinched or pulled wires.

 

[airline tech]

So, if you have an active Airbag Light (constant) I would check (2) fuses (BCM Fuse 14 & 19) other than that - You are going to need codes to pinpoint down the issue.
As of now we are focused on the MS-Can network modules, but the Can network crosstalk's with all other networks.

If the passenger seat is the main start of the issue - it has various sensors in it.
Occupant Sensor - This is the Airbag Light on the (FCIM) that displays (ON) when occupied.
Seat Track - Position - (Where it's at) Front / Back
Seat Belt - Latched and Seat Belt (Retractor) position

But all of these inputs are on other Can Buses, that crosstalk with the MS-Can

 

[isthismyusername]

I wanted to post a follow up. As a last ditch effort I once again looked at the wires under the passenger seat and right around the blower fan under the glove box. To my surprise the issue has been resolved! I am not quite sure what happened or which cable exactly I moved but I pretty much crawled on the floorboard and started checking every cable I could see.

My best guess as to what happened is this harness right above where your feet go. If anyone could clarify what this is, I believe this had to do with the issue. I believe, if this ever happens to anyone, when my passenger reclined they stretched their feet up to the top of the floor mat and unseated something just enough to start causing problems. However, upon unplugging several things the issue appears to have gone away, hopefully forever. I will be back if it occurs again. All systems are functioning normally. Thank you for all the advice

Just to reiterate, the issues that appeared when this problem started

1. FCIM lost power, backlighting, and functionality, including air and radio controls
2. Restraints Indicator Lamp Warning
3. No temperature on instrument cluster
4. Auto Start/Stop button lost functionality and car would not auto start/stop at all (maybe some peoples dream come true)

 

[RangerBill]

The first picture is of the DC-DC Converter Control Module. It is used for voltage stabilization to some electronic modules. It is used for the Auto Start/Stop system. It feeds voltage to the Image Processing module (for the front camera), cruise control module, 4x4 switch module, Auto Start/Stop, and rear parking aid camera.

Edit: It also feeds the FCIM and Audio Front Control Module (AFCM) so if this connector was loose, it would account for all of your symtoms.

 

[RangerBill]

Here is the wiring diagrams for the DC/DC Converter. Notice that the DC/DC converter output (red wire SB101) (first image) feeds F33 and F12 (second image).

 

[airline tech]

Good Find - In addition to the DC/DC Convertor
Mounted on the Left - In that area - BECMB - Batt Energy Cont Module (Feeds the Airbags)
Mounted on the Right - In the 2nd Pic - Is the TCU (Black Box) and under it is the TRM(Silver Box)
If the pic is the area I think it is (RH Kick Panel)

The DC/DC Convertor feeds Fuse#12 in the BCM, if it was fully disconnected you would have lost more.
I focused on the seat movement - not where their feet would be, so this brings a (NOTE) for tall passengers with long legs that can reach it - HEY DON'T DO THAT

Again - Good Job chasing the issue

 

[isthismyusername]

I wanted to post a final (hopefully) update to this to make sure this doesn't happen to anyone in the future. While I originally thought my previous post was the solution to the issue, my problem did come back. After looking around some more I was able to find a white wiring harness on the passenger side behind the panel on the right ride near the floorboard. I have not the slightest idea when or how this would've happened unless it was a manufacturing issue. But it appears the clip on this harness was missing/broken and the plug was barely hanging on/falling off. I disconnected, reconnected and put a zip tie around and haven't had the issue for about a week now. Hopefully this doesn't happen to anyone but if it does I hope this helps.

 

[NotBudule2]

Damn , good find ?,! so when the passenger reclined, he must have disturbed it?
If that happened at the factory , then there is more than one out there I'm afraid...

 

[airline tech]

Best that I can tell that is Connector (C211) it has some wiring for the FCIM & BECMB both of these tie into the Restraints (Airbags) as well as the FCIM panel going dead.

That panel covers the connector, so it's a mystery how it got damaged, unless someone has had it disconnected (History)

Or

Since that panel is a tight fit, the inside edge of the panel caught the connector, when someone had it off and reinstalled it.

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