Door Lock Buttons

[Woods22250]

You are more than welcome. The people on this forum are great at helping each other out. Good luck on the repair.

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[RangerBill]

Have you tried this procedure since replacing the truck's battery?

Ranger Reset Battery Monitoring System (BMS) After Replacing the Battery​

To reset the BMS on a 2019+ Ranger turn the Key On then operate the high beams 5 times, then press the Brake pedal 3 times and confirm BMS reset by flashing battery light on the dash.

 

[Woods22250]

Yes, this has been done twice.

 

[airline tech]

If you press any of the other door lock buttons, does it give you the fault (as the driver's side does)?
While waiting for switch you may try disconnecting the driver's side and see if the others start working.

 

[Ext1809]

If you press any of the other door lock buttons, does it give you the fault (as the driver's side does)?
While waiting for switch you may try disconnecting the driver's side and see if the others start working.

I don't have any problems with any of the other switches, isolated to just driver's side.

 

[RangerBill]

Yes, this has been done twice.

Just curious, did you get the flashing battery symbol after completing the BMS reset?

 

[airline tech]

C505 - Drivers Switch

You could remove the switch and with using the connector pinout as a guide, test the switch itself with a meter.

Ohms Scale:

Lock: Pin 2 to Pin 3
Unlock Pin 4 to Pin 3

Press and hold the switch for each position - should get continuity and open with the switch released.

As Ragerbill mentions the BMS reset, you can do this with Forscan (I Think) I saw it in the menu.
This is why I prefer to do the reset via a scan tool, there is no guessing - as you get a confirmation message on the screen that is has been successfully performed.
However, if you wanted a secondary confirmation, find your Time Since Install Date Live Pid data and it will show (x) number of days.
When you do the BMS reset, this date resets - this is what the BMS programed data uses as a ref for the battery age and the charging algorithm.

as far as the switch removal, yes, the door panel has to come off, the release tabs are on the back of it.

There is a good reference video in this audio upgrade series on the door panel removal.

New Ford Ranger in for a Kicker Key and Morel upgrade Installer Diaries part1 (youtube.com)

 

[Woods22250]

So switch replacement and fuse pull did not fix the problem. Tried doing a bms reset with forscan and I get an error bms configuration is not available. Can do a reset from turn and brake with 4 battery flashes. Weird thing is bat voltage at plug in was 11.8v. Definitely not normal

 

[RangerBill]

Weird thing is bat voltage at plug in was 11.8v. Definitely not normal

This might be normal since the voltage at the switch is provided by the BCM (body control module) and is only there to sense that a lock or unlock switch is pressed. It is not supplying voltage directly to the door lock motors.

 

[Woods22250]

Sorry I meant when I plugged in forscan.

 

[RangerBill]

Sorry I meant when I plugged in forscan.

So Forscan is reporting 11.8 battery volts? What is your battery voltage measured with a multimeter?

 

[Woods22250]

The same. As soon as I start truck it goes to charging and reads 14.2v. I am tempted to go get a new battery and reset bms and see if this works. I think k I read some other post that battery voltage is key. I think I also read that motorcraft batteries were junk. It is stamped 5/23. Put in in May.

 

[RangerBill]

The same. As soon as I start truck it goes to charging and reads 14.2v. I am tempted to go get a new battery and reset bms and see if this works. I think k I read some other post that battery voltage is key. I think I also read that motorcraft batteries were junk. It is stamped 5/23. Put in in May.

That low battery voltage is your problem with the door locks in my opinion.

 

[airline tech]

Ok, with all that has been reported and that the OP is stating that if the BMS sensor is disconnected - it works normally. I am leaning towards a bad BMS sensor, false reporting the battery voltage the system is responding to that (false data) and shutting off the voltage supply.


Disconnect the BMS sensor:

Connector Side:

Ign (OFF) - Measure pin 2 to GRD (Red Wire) - should match battery voltage (Post to Post)
with a variance tolerance of (.5) volt.
This wire is a direct feed from the small connector on the positive (BMFL) (Item (B) and is not pictured but you will see the connector (down on the side)
So this is (+) input for the BMS sensor

Ign (ON) - Measure pin 1 to GRD (White Wire) - this is the LIN circuit for the BCM monitoring.

Pinpoint Test, just asks:
Is voltage GREATER than 10 Volts?
Yes- Repair the Circuit
No - Proceed to deeper wiring checks

So, my thought is that if you have good battery voltage on Pin 2 (test result) then the BMS sensor is not accurately reading the voltage.

The issue is at this point, with Forscan, it is hard to navigate the LIve data pids, meaning I am not 100% sure exactly where in the system the previous (pic) you posted. Where is that specific data coming from?
So, if we assume that the BCM is actually seeing 11.8 volts then this is the possible reason for the locks not working.

Either way, if you can get it to work with the BMS sensor disconnected and it does not with it plugged in, then we can confirm that the issue is within the BMS circuit.

But you may also want to check for security the connection feeding down to the High Current Junction Box, this feeds down to a box under the BJB which has the main BCM fuse
Item (C)

 

[Ext1809]

That low battery voltage is your problem with the door locks in my opinion.

disagree. I have the same problem and already changed battery did the battery reset and still same problem

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