Code 9116 concerns the seat occupancy sensor on Mercedes vehicles. That sensor tells the restraint system whether a seat is occupied, and the control unit has found its circuit reading outside the expected range.
Occupancy sensing lets the restraint control unit decide whether to enable or suppress an airbag for a given seat. On Mercedes the sensing element sits in the seat cushion and reports through a connector under the seat. Code 9116 says the circuit to that sensor is faulty, which leaves the control unit without a reliable answer about who is sitting there.
The published definition names the sensor without naming the seat position or the exact failure mode. Read the full code set and the freeze frame data to establish which position the module is complaining about, and check the Mercedes service information for that model. Guessing at the position leads to a seat torn apart for no reason.
The control unit measures this circuit live, which is why 9116 sits with the circuit codes. The reading changes with the wiring, and the code clears when the circuit is healthy. Crash data is recorded history rather than a measurement, written at the moment of deployment and cleared only by a module reset.
Because the module is reporting an actual circuit condition, a reset does not solve it and the code comes back at the next self test. Repair the wiring or replace the sensor on the vehicle. If the same Mercedes module is also carrying crash data from a deployment, that is the part our mail in service handles, and you can reach us at 501-988-0611 to confirm what applies.
Mercedes-Benz is the make listed for 9116. Their occupancy sensing hardware differs across models and years, so identify the exact system in the car before ordering parts or planning a calibration.
Start under the seat with the connector, since disconnection during seat service explains a large share of these and takes a minute to check. Move the seat through its travel while watching the circuit to catch a flex harness that breaks contact at one end. Inspect the cushion for spill damage and for aftermarket covers pressing on the sensor. When the sensing element is the fault, the seat sensor assembly is the repair. Related codes: 9069, B1001, B1BBA.
Trace the wiring and connectors first. If the module still holds the fault after the repair, mail it to us and we will clear it.
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Do not see it listed? Request a part or call 501-988-0611.