2014 Ford Fusion Restraint Module Doesn't Wake Up

Travis Mobile Technician Wisconsin Posted   Latest  
Resolved
Collision
Network Communications
2014 Ford Fusion SE 1.6L (R) 6-spd (6F35)
U0151-87
U0452-86
U0415-86
No Communication

More often then not, the airbag module will not communicate. When this happens, the 911 Assist is unavailable shows up in the info center as well as ABS and Traction lights. When you turn the key on, the passenger airbag light will self test is the airbag module is communicating and will not turn on it it isn't. I can cycle the key a few times and it will wake up or sometimes scan tool communication will cause it to wake up. My gut feeling is the module isn't waking up for some unknown reason. The module has been replaced. All modules that can be updated through IDS have been up dated. The module has good power and grounds. I have not been able to see any thing wrong with the communication lines. When the Airbag Module doesn't communicate, all other modules do beside passenger presence module which is wired off the Airbag module. Looking for any direction on this one. 

Thank you. 

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Interesting
Mike Owner/Technician
New Jersey
Mike
 

Sounds like bad or incorrect module. I've never had a ford airbag module not wake up after replacement.

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Travis Mobile Technician
Wisconsin
Travis
 

I ran the numbers and it is the correct module for the vehicle and also matches the old module with the same issue. Customer sent the vehicle to me with the new module that he wanted installed. The module communicates 40% of the time.

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Jeffrey Mobile Technician
Illinois
Jeffrey
 

Scour a wire diagrams for a wake up signal or ign. run voltage That you may have missed. I’ll look myself once I get home

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Travis Mobile Technician
Wisconsin
Travis
 

From what I can find, it must be done through the communication line. I also can't get a definitive answer on who is in charge but I am leaning towards BCM or then FCM.

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Taylor Owner
California
Taylor
 

I think I remember a escape from a body shop I took a glance at years ago that was the fcm when they called me to program the bcm and didn’t fix the problem I started testing further and found a wire having 2 volts instead of 12v dont exactly remember details perfectly but kinda seemed to bring a memory of similar situation

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Marlin Technician
Oregon
Marlin
 

Did you review the schematic and determine all switched and unswitched power circuits? Did you test these and the grounds when the fault occurred? The power up/power down sequence should be in SI.

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David Technician
Michigan
David
 

Is it a factory rcm or reman? Sounds like a module issue to me. Double check your power feeds and grounds. Poor fitting fuse could do it. …Low voltage feed at times

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Travis Mobile Technician
Wisconsin
Travis
 

Did it with the old RCM as well. OEM module. I will have to start from scratch on this one and reverify powers and grounds.

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Glen Owner/Technician
Illinois
Glen
 

I would verify circuit 3285/Pin 1 at the OCSM is always getting proper power.

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William Owner/Technician
Kentucky
William
   

We had a rcm with spread pins making intermittent contact to a impact sensor, have you tried wiggling the wires to the rcm to see if it wakes up. Somebody may have front probed the connector causing loss of terminal tension.

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Eric Owner/Technician
Wisconsin
Eric
 

According to the wiring diagram there is a Run/Start relay controlled by the BCM at the left end of the dash. This relay provides power to the RCM (Restraints Control Module) as well as the OCSM (Occupant Classification System Module) along with a few other things I'm not sure the car is equipped with. Is the OCSM what you are calling the Passenger Presence Module (PPM)? I couldn't find…

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Travis Mobile Technician
Wisconsin
Travis Resolution
 

Started from scratch. Airbag module gets ignition power from a fused feed that is a part of the BCM. I have 4 volts at BCM airbag fuse and at airbag module. BCM supply feed for that circuit at BCM is at battery voltage. I must have verified that circuit at a time it was working and never rechecked it. Thank you.

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Marlin Technician
Oregon
Marlin
 

One of the toughest aspects of electrical diagnosis is the number of times. and number of conditions in which, something may need to be tested before confirming a fault. … job on persevering.

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Glen Owner/Technician
Illinois
Glen
 

Travis, What is the fix if you don't mind me asking?

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Travis Mobile Technician
Wisconsin
Travis
 

New BCM. 12v into BCM 3-12v out of BCM to the airbag module.

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