TCU Stuck in Factory Mode

Ford SYNC 3 Support CyanLabs Update Support
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1

Sync 3 dropped, master reset, battery disconnect and upgrade to Sync 3.4 would not restore connectivity. ForScan shows TCU in Factory mode, tried the change the TCU module config from the B132 to B100 and then back again to see if it would change. It just stays in factory mode. I am very new to Forscan so it is likely what I’m doing. When I rewrite the asbuilt info and write the changes it asks me to turn the vehicle off then back on. Doing this severs the connection with the vehicle and Forscan so I’m not able to watch the PID in Live stream and see if anything is changing. The country code is showing as 0, Cell signal as 159 Keypos Ignition Network Ident 0 TCU State Operational Voltage 14.6 and no DTC’s

SYNC Region: NA

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: OEM

Old SYNC Version: 3.0

New SYNC Version: 3.4

Do you have a error message, if so what is it?
Ford Pass connect will not connect to vehicle for authorization

Update Method: CyanLabs Manual Method

2

@F150Chief has a write up about activating a TCU. Maybe he can hop on and share the link. Its a good write up so I am sure it will help.

3

That might help, I have a pretty good write up but my lack of experience with ForScan is very likely the issue. It tells me I have to turn the vehicle off then back on, but that breaks the connection to forescan so I can’t watch the live PID data to see if it is actually trying to change anything. Everything I’ve read about making changes to the As Built Data never refers to having to cycle the vehicle off then back on. Not sure if that may be my only issue

4

Here’s a link to the guide.

https://community.cyanlabs.net/uploads/short-url/w9fft8ABDsWyvZw5WdWcWGm5WQg.pdf

Have you done a master reset on the APIM?

5

I’ve done a master reset probably about 5 or 6 times in the last week. The issue is that the TCU seems to be stuck in Factory Mode, I need to get it to change to anything other than that so I can then reload the As built data and hopefully get it to a state where I can activate it again.

6

Follow the guide….you have no cell connectivity or not the right connectivity. The TCU should identify the country immediately as well as the carrier.

Does the APIM show the TCU serial number?
What is the TCU model number? K or J?

7

Thanks for the response, I’ll check to see if the APIM shows the TCU Serial number tomorrow when I’m back out at the truck, I’ll confirm the TCU model number as well but I believe it was a J.

Is the link to the guide that Walock provided the same guide you are referring to. It seems I’ve been able to come up with at least 2 versions of a guide to reset/authorize a TCU. The major difference between the two is the configuration of TCU as built info to put it into Factory mode as well as whether or not the vehicle should be ON or Running. Anyway, if you can point me to the correct guide, then I can reference particular points in the guide that I know you would agree with. Thanks again for your help

8

The vehicle needs to be on and running, as the guide says ignore the ForScan ignition off/on when the AB is changed to move it through modes.

So not knowing what all you’ve done to the AB of the TCU at this point…

  1. reload the factory into the TCU, follow the ForScan prompts to get this back where you started.

  2. For a vehicle in North America, in ForScan change 754-01-01 to B133 0000 0041, save, do NOT cycle power

  3. Go into the PIDs and watch the auth state, once it goes from un-provisioned, if you have good AT&T cell service it should go to Wait for Authorize in a few minutes

  4. Go into FordPass, login and ask for access, acknowledge the request when it comes in on the car

  5. Once you’re provisioned, load the factory AB for your vehicle back in, write and reboot.

9

Very nice clarification, thank you, I will try this afternoon when I get back from golfing. Priorites :slight_smile: