Welp..... took the truck into the dealer. He checked the codes and all that. Then sent a email to ford about the problem, he said Monday they are going to try to diagnose some wiring problems, or to see if its in the wires. I looked at them this morning and could not tell a thing was wrong with them at all. He also said no power was going to the backlighting wire. (Purple and gray.) But while it was in the dealer a new problem surfaced, the headlights will not turn off? Its like the truck is stuck in night mode. I guess my question is now, if they replace the BCM, will this happen again? What caused this in the first place? I can't confirm that this problem was not happening before the install becasue I had only been daytime driving. I guess I noticed it with the NAV install becasue it was in the garage and I was going over everything with a fine tooth comb. So in it goes Monday to do some test and possibly get a new BCM on tuesday. I just wonder if they discover the spice for the MIC will they try to say thats the reason? I want to disclose that to them, but I'm scared Ill be stuck with the bill.

Also, I don't understand the MIC not working? Could this be something to do with the BCM as well? I know it is hooked up right and everything. If I can get my lighting fixed, I would 100% let the mic situation go.


I would like to add as well that the dimmer and backlighting still work for the radio, instrument gauges, the trailer brake control, and the HVAC. Also the window and door locks still work. I had to disconnect the battery to get the headlights off tonight. BUMMED OUT


ALSO. I would like to add that the tech checked the purple wire voltage at connector C2280B and he read nothing.

 

Hey lexustbs, sounds like the tech did the right tests. If no voltage on that connector then they will needed to replace the BCM. Most likely the internal switching transistor is cooked - why? either it got a big reverse current surge put its faulty from manufacturing. In any case out should be acm isolated incident.

the mic circuit is isolated so I doing this is something you caused.

As for your headlights turning on I am sure its a result of the bcm faulting on the Can bus.

The only other thing I would check is the continuity from pin 40 on C2280B to the in line connector where you made the mic splice.

I am back this afternoon if I can be of anymore assistance.

 

Ok thanks. The tech said he was going to do some wiring test tomorrow at the request of Ford. Then if they all check out, it will be the replacement of the BCM. My only fear is the wiring being bad from something I did, and then the BCM blows again. But like I said, everything I did was with great care. I hope this BCM on tuesday will bring my truck back to life so I can enjoy my new NAV investment (def. not a investment )

Do you have any ideas on the MIC wiring? Can you explain the ACM isolated incident?

 

Stupid typos on my cell phone trying to post that response. Sound like english is my second language!

what I meant to say was itis likely an isolated incident.

The mic issue is the Nav system schematics show the mic should be connected to the APIM mic inputs and the APIM MIC outputs then go to the Acm mic inputs. The instruction diagram has the mic connected directly to the acm mic inputs which appearsto be only for systems with no sync.

The acm thinks the apim should be processing mic inputs rather than itself.

 

Get the tech to check the continuity on the purple wire from the bcm connection to the in line connector. I highly doubt the bcm faulted because of something you did.

 

So your saying the contiunity on connection C265? What connection should I be doing my MIC splice in? I highly doubt it too? But just kinda weird that it happend around the same timeframe. I don't care, I just want my truck to work really. And its my fault for doing this to begin with. Thanks for you help Dennis. It really means alot to me.

 

Yep, C265 pin 9 where the purple wire comes. Its probably fine but just in case.

I don't have the schematic on front of me at the moment for the mic connections but Ill post it when I get home.

 

I checked that one myself and all was good. It was after that I felt overwhelmed and decided to see what the dealer does. I still want the mic, but it's not worth this. My stomach and head has been hurting since Thursday.

 

It also seems as if the old radio had the mic, then you should be able to splice somewhere behind the headunit to make it work. When installing the radio I plugged the old big harness into a female harness, then the male end into the new nav radio? But the mic inputs go to the smaller 12 pin connector. I think it's 12 pins

 

Okay, here is the mic connection from the Diesel Stop which you used to base your splices on:



In the diagram above, the splice connection is being made to connect Pins 12 and 14 of Connector B (C265) to Pins 11 and 12 of Connector A (C240C).

Pins 11 and 12 on C240C are MIC In +/- respectively. Pins 12 and 14 on C265 are the actual microphone lines +/- so that would seem logical to tie these together.

However, here is how the factory navigation system is wired:



As you can see, by making this splice connection as per the above instructions from Diesel Stop you end up connecting the microphone lines to both the ACM MIC inputs and the APIM MIC inputs. Now the question is, does this matter? I can't say for sure but the following text from the workshop manual indicates the microphone is wired to the APIM and then the APIM relays info to the ACM, which is consistent with the schematics. Text:

"Voice Recognition For Vehicles With Navigation And The SYNC® System

When the audio system enters voice recognition mode, the ACM initially controls the voice recognition feature. The microphone is wired directly to the APIM, which relays the microphone input to the ACM through dedicated wiring. If the first command spoken is part of the ACM voice recognition set, the ACM retains control of the voice recognition and takes the appropriate action(s). If the first command spoken is part of the APIM voice recognition set, the ACM shuts off its own voice recognition and broadcasts a Controller Area Network (CAN) message to the APIM, transferring the voice recognition to the SYNC® system and providing the voice command that was spoken. The ACM controls the voice engine for the base audio, navigation and climate control systems. The APIM controls the voice engine for the SYNC® system (USB port, audio input jack, and Bluetooth®)."

So, based on this you need to make the splice between the APIM (C2298 Pins 12 and 13) and ACM (C240C Pins 11 and 12).

 

Here is where C2298 is located behond the glove box:



Here is what it looks like:

 

Ok the dealer says that the BCM is shorted out becasue something internally in the radio is making it go haywire? But I find that hard to believe. I think something happened when I was installing the radio that made a power spike or a short circuit that caused the BCM to fail. They are just wanting to put the OEM radio back in and fix it back and call it good? What do you think? I think one time I unplugged the radio with the car running and then plugged it back in. Would that cause something like this to happen? I'm kinda screwed because I already took out the old satellite radio to mount the new AMP for the NAV radio. But I hate to get the truck fixed with the new BCM, then the NAV radio blows it up again. Can I have just one more ounce of your advice?

 

Hey no worries - blown transistor by the sounds of it. The radio itself is not going to short anything out - it doesn't supply/output power anywhere so he's talking out his ***.

Now, there should be DTC's being thrown verifying the short circuit. Ask the dealer to give you all the codes - better yet get a copy of the full diagnostics session report printed out.

I presume they are going to replace the BCM but why would they want to put the old radio back? Do you have the new unit in there at the moment? At least if you keep the new radio in and they blow the BCM again it will be their fault.

 

I'm a little suspicious of their claim the BCM failed as a result of the radio and that they want to put the old radio in and call it good.

That's why I recommended you ask for the session diagnostics report - I think they are speculating without evidence.

The easy way out for them is to replace the BCM and then put the old radio back in. Now if they replace the BCM and put the new radio back in, they will need to ensure it works properly. If in fact the radio is faulty, seems that would be warranteable as well.

I would not settle for them putting the old radio back in.

 

One other thing - if you can get them to agree to put the new radio in with the new BCM and it all works, you may ask them to then also do the MIC connection.

At least it would confim/verify the differences between the MIC instructions for the splice and what the factory diagrams are showing.