2019 Edge - RCM error U0413 Invalid Data Received from Battery Energy Control Module 'B' (where is it, how to replace it, etc.?)

[DanEdge82]

Long story short... airbag light came on 3 weeks ago, then the battery died within 2 days. It was an old battery so I bought a new one and dropped it in, and did the 5x headlights 3x brake 'trick' to reset things, assuming that was sufficient.

This week, the airbag light came on again, but this time, the new battery died yesterday. I jumped it, ran it for quite some time.

I hadn't bothered to check codes before this, so I grabbed my OBD2 cable & started up Forscan.

There were a number of codes, but only one present at the time of request. I figure the others came up due to the battery dying. So I reset the DTCs and just one code continues to come up:

• U0413 Invalid Data Received from Battery Energy Control Module 'B' (from the RCM)

 

It seems like the BECM 'B' is busted and drawing current when the vehicle is off, because... I also used Forscan to check the Battery State of Charge last night, and it was 99%. 8 hours later: 70%.

I ran the vehicle for about an hour or so and it was back up in the 90s. 

I searched U0413 and found one other thread on this forum, but that person also had a bunch of other errors and their issue seemed to be the RCM itself.

 

The BECM 'B' module looks to be PN HU5T-14G490-AF or HU5T-14G490-0C and it's like $70 new or $35 if I take the eBay plunge. 

So, the questions I have for the other owners here, are...

• Do you think my BECM 'B' is the root cause? Or is it failing because of something else (like a short? ugh... I hope it's not a short...)
• Where is the BECM 'B' located, exactly? I'm cool with tearing some things apart to get to it, but I don't know where to find it...
• Is the BECM 'B' a plug & play / drop & replace type of part, or does it need very specific programming for my specific make/model/VIN/etc.?
• Since the RCM is shooting the BECM 'B' communication error, should I be worried about the RCM/airbags/SRS?
• Am I stuck with needing to take this to a dealer?

 

Thanks in advance for any suggestions or insight!

 

 

[Wubster100]

First off, I would put aside the RCM / BECMB DTC and focus on the parasitic power draw. It is likely that the RCM or BECM-B are the cause of the battery drain, but you should complete a parasitic battery drain test to confirm and find the issue. Parasitic Battery Drain Job Aid.pdf 

Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) - Overview

The RCM continually receives and monitors inputs from the OCSM, BECMB and various other hard-wired switches and sensors. If the RCM detects a sudden vehicle deceleration and/or lateral deceleration based on the information received from the various sensors, and determines that deployment is necessary, the RCM applies voltage and current to deploy the appropriate SRS components.

Extended Power Module [BECMB]

The BECMB provides system voltage to the RCM and OCSM when the ignition is ON. Additionally, the BECMB is designed to ensure that the RCM and OCSM remain powered on if the ignition is turned off while the vehicle is moving at a speed greater than 4 km/h (2.5 mph).

If the ignition signal is active / high while the vehicle is travelling at a speed above 4 km/h the BECMB maintains system voltage on the RCM and OCSM power supply circuits. If the ignition signal is lost, missing, or below a certain threshold while the vehicle is travelling at a speed above 4 km/h (2.5 mph), the BECMB maintains system voltage on the RCM and OCSM power supply circuits and a telltale appears in the IPC. If the vehicle speed rises above the threshold again, the BECMB does not reactivate the power supply to the RCM and OCSM. They remain off until the ignition is turned on again.

If a vehicle is parked, with the ignition off, the BECMB does not provide power to the RCM and OCSM. If the vehicle begins to move, while the ignition is still off, the BECMB does not power the RCM or OCSM.

When the vehicle has been started using the remote start feature (if equipped), the ignition status is off, but the BECMB powers the RCM in order to detect a collision and disable the fuel pump, if necessary

The BECMB supplies system voltage to the RCM and OCSM, based on HS-CAN1 inputs and the ignition input.

The BECMB requires PMI when being replaced. Refer to the diagnostic scan tool instructions to carry out PMI.

Supplemental Restraint System (SRS) Depowering

WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
 

1. WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.
2. Determine if a SRS fault is present. Turn the ignition OFF and wait 10 seconds, then turn the ignition ON and monitor the airbag warning indicator. The airbag warning indicator illuminates continuously for approximately 6 seconds and then turns off. Continue to monitor the airbag warning indicator for approximately 30 seconds as this is the time required for the RCM to complete testing of the SRS.
3. If a SRS fault is present the airbag warning indicator either fails to light, remains lit continuously or flashes. The flashing may not occur until approximately 30 seconds after the ignition has been turned from OFF to ON. If this occurs, diagnose and repair any SRS faults before proceeding with other repairs. If after the ignition has been turned ON for 30 seconds the airbag warning indicator remains unlit with no chime or SRS message displayed in the message center, no SRS fault is present. If the airbag warning indicator is inoperative and a SRS fault exists, a chime sounds in a pattern of 5 sets of 5 beeps or a message displays in the message center. If this occurs, diagnose and repair the airbag warning indicator and any SRS faults before proceeding with other repairs.

No SRS Fault Present (with ignition ON, airbag warning indicator stays off after prove out)

1. WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Ignition must remain OFF until repair is complete. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.
   Turn the ignition OFF and wait one minute before continuing vehicle service.

SRS Fault Present

1. Turn the ignition OFF.
2. Remove the RCM fuse or if equipped, BECMB fuse(s).
3. For a vehicle equipped with a 3 blade BECMB/ GWM fuse, install a 2 blade 10A fuse at the GWM position to allow the scan tool to communicate with the vehicle network.
4. Turn the ignition ON.
5. Using a diagnostic scan tool, carry out a Network Test. Verify that the RCM and, if equipped, BECMB does not respond to the Network Test. If the RCM or BECMB pass the Network Test, remove the correct RCM or BECMB fuse and repeat the Network Test to verify before proceeding.
6. Turn the ignition OFF.
7. Disconnect the battery.
8. Wait at least one minute before continuing vehicle service.

BECMB Installation

1. To install, reverse the removal procedure.
2. Repower the SRS. For a new BECMB, do not prove out the SRS at this time. Refer to: Supplemental Restraint System (SRS) Repowering.
3. NOTE: This step is only necessary when installing a new BECMB. Using a diagnostic scan tool, complete the PMI process for the BECMB following the on-screen instructions.
4. If a new BECMB was installed, prove out the SRS as follows: Turn the ignition from ON to OFF. Wait 10 seconds, then turn the ignition back to ON and monitor the airbag warning indicator with the airbag modules installed. The airbag warning indicator illuminates continuously for approximately 6 seconds and then turns off. If a SRS fault is present, the airbag warning indicator either fails to light, remains lit continuously or flashes. The flashing might not occur until approximately 30 seconds after the ignition has been turned from OFF to ON. This is the time required for the RCM to complete the testing of the SRS. If the airbag warning indicator is inoperative and a SRS fault exists, a chime sounds in a pattern of 5 sets of 5 beeps. If this occurs, diagnose and repair the airbag warning indicator and any SRS faults.

 

20 hours ago, DanEdge82 said:

Where is the BECM 'B' located, exactly? I'm cool with tearing some things apart to get to it, but I don't know where to find it...

Electrically, the BECMB is located on the HS1-CAN network. It is physically located somewhere nearby the RCM, underneath the center floor console.

 

20 hours ago, DanEdge82 said:

Is the BECM 'B' a plug & play / drop & replace type of part, or does it need very specific programming for my specific make/model/VIN/etc.?

The BECMB requires PMI when being replaced. Refer to the diagnostic scan tool instructions to carry out PMI.

This means that the AsBuilt data of your BECMB will need to get copied over from the old one to the new one.

 

20 hours ago, DanEdge82 said:

Since the RCM is shooting the BECM 'B' communication error, should I be worried about the RCM/airbags/SRS?

Yes. Ensure you properly power down and power on the SRS system to safely work on it. Remember your health and safety.

 

20 hours ago, DanEdge82 said:

Am I stuck with needing to take this to a dealer?

You need to have the skills to troubleshoot the electrical issues and work safely. You can use FORScan to program the new module if it gets replaced. You also must remember the importance of your health an safety.

Edited 2 hours ago by Wubster100