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Failure Pattern: ABS Wheel Bearing Hub Unit Wiring Harness Failures After New Unit is Installed.

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The most vulnerable part of a wheel bearing hub unit with integrated wheel speed sensor is the connector. Regardless of the design, the integrity of the circuit comes down to the seal in the connector. If the seal is not replaced and properly seated, water and corrosion can cause an intermittent problem with the wheel speed sensor signal.
The most common failure is the foam or rubber seal falling out of the female connector during installation.

SKF has released a tech tip on the subject in their August Pole Position e-newsletter.


Preventing ABS sensor failure in pigtail style hub assemblies

“Make sure the weather pack has not fallen out of the harness. Replace if missing. Without the weather pack, water intrusion will occur damaging both the ABS sensor on the hub and the harness side wiring and connector.”

Click Here To See the Full Tech Tip

BMW in has released its own Technical Service Bulletin (TSB) on the topic:
 
SEAL ON 2- AND 3-PIN PLUG CONNECTORS
When connecting or disconnecting 2- or 3-pin plug connectors on any BMW model, it is possible for the rectangular seal to fall out of the plug housing. If this should occur, the loss of the seal can easily go unnoticed. See Fig. 5.
In addition to preventing moisture from seeping into the plug, the seal also ensures that the two halves of the plug are properly tensioned so that the contacts do not move within the plug. If such movement should occur, the contacts may develop corrosion.
Corroded and/or loose contacts can cause problems with the proper functioning of the vehicle, and may cause difficulty with diagnosis due to the possible intermittent nature of such problems.
Service Procedure:
It is essential that you check that the seal is in place before connecting a 2- or 3-pin plug connector. If the seal is missing, it must be replaced.
 

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      It always amazes me when I hear about a technician who quits one repair shop to go work at another shop for less money. I know you have heard of this too, and you’ve probably asked yourself, “Can this be true? And Why?” The answer rests within the culture of the company. More specifically, the boss, manager, or a toxic work environment literally pushed the technician out the door.
      While money and benefits tend to attract people to a company, it won’t keep them there. When a technician begins to look over the fence for greener grass, that is usually a sign that something is wrong within the workplace. It also means that his or her heart is probably already gone. If the issue is not resolved, no amount of money will keep that technician for the long term. The heart is always the first to leave. The last thing that leaves is the technician’s toolbox.
      Shop owners: Focus more on employee retention than acquisition. This is not to say that you should not be constantly recruiting. You should. What it does means is that once you hire someone, your job isn’t over, that’s when it begins. Get to know your technicians. Build strong relationships. Have frequent one-on-ones. Engage in meaningful conversation. Find what truly motivates your technicians. You may be surprised that while money is a motivator, it’s usually not the prime motivator.
      One last thing; the cost of technician turnover can be financially devastating. It also affects shop morale. Do all you can to create a workplace where technicians feel they are respected, recognized, and know that their work contributes to the overall success of the company. This will lead to improved morale and team spirit. Remember, when you see a technician’s toolbox rolling out of the bay on its way to another shop, the heart was most likely gone long before that.

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