Without Manufacturers’ Information, You’re Flying Blind. OEM information prevents a serious headache on a Jeep Liberty repair.
By Karl Kirschenman
Mike is a great guy who runs a collision repair facility in Joliet, Illinois. We’ve always had a good relationship and he never holds back when we talk. Good or bad, you’ll get exactly what you asked for – complete honesty.
Mike had only been using OEM repair information for a couple of weeks, so I called him looking for some feedback. I was not expecting to hear what he told me. I specifically asked him how he was doing using OEM repair information in his shop’s workflow. Mike told me that in the short time he had been using factory information, it had already saved his shop from having a serious delivery issue. And Mike has always taken pride in delivering vehicles to their owners on time.
Describing what happened, Mike said, “We had a Jeep® Liberty® in here. It had an OCS (occupant classification system) module and an ORC (occupant restraint controller) module. Luckily we checked before we installed the new modules, because, according to the OEM, you must install them one at a time. Install the occupant classification module (OCM) first and allow it to receive calibration data from the ORC. Then install the ORC module and allow it to calibrate with the OCS. If you install both new modules at the same time, you have a serious problem – it sets an irreversible fault. How would we have known that? It would be impossible to know that! Without OEM information, you’re flying blind.”
Fortunately, Mike’s technician looked up the procedures ahead of time, and it’s a good thing he did. He saved the shop a lot of hurt.
Basically, the OEM procedure says that the OCS components of the passenger side front seat cushion (including the cushion frame, springs, pad, seat weight bladder and pressure sensor, seat cushion foam and the OCM) are a factory-calibrated and assembled unit. Once the OCS is installed and the electrical connections are made, it uploads calibration settings from the OCM and stores them in the memory of the airbag control module, also called the ORC (occupant restraint controller). Any time any one of the OCM components is removed or replaced for any reason, the OCM must be re-calibrated.
Simple right? Not really! Here is one of the warnings included in the OCS/OCM installation procedure:
“CAUTION: On vehicles equipped with the Occupant Classification System (OCS), never replace both the Airbag Control Module (ACM) (also known as the Occupant Restraint Controller/ORC) and the Occupant Classification Module (OCM) at the same time. If both require replacement, replace the OCM first. Then perform the supplemental restraint verification test including an ignition-On time of at least one minute before replacing the ACM. Both the ACM and the OCM store OCS calibration data, which they transfer to one another during the first minute of ignition-On time after one of them is replaced. If both modules are replaced at the same time, an irreversible fault will be set in both modules. If the data transfer is not allowed sufficient time to complete between modules (at least one minute of ignition-On), an irreversible fault will be set in the module requiring the data.”
Part of the physicians’ Hippocratic Oath says that they must do no harm. I think that goes for collision shops, too. When a customer brings in their vehicle, they expect that the shop knows how to correctly repair it. They don’t expect the shop to damage it further. It happens, but it’s kind of bad for business, don’t you think?
Mike summed up the value of OEM collision repair information, “When you can show the insurance company and the vehicle owner that the car was repaired to factory standards, everyone wins!”
NOTE: This repair/service information is excerpted from information published by the vehicle manufacturer, and intended for the purpose of promoting OE collision repair information to trained, professional technicians with the knowledge, tools and equipment to do the job properly and safely. Before attempting any repairs described, refer to the complete article in ALLDATA Collision® S3500. It is recommended that these procedures not be performed by “do-it-yourselfers.”