0X93092B: Driver End Fitting Tensioner

Circuit fault

What 0X93092B means

An end fitting tensioner pulls on the lower anchor end of the belt rather than the spool end. Doing both ends at once takes more slack out faster, which is why BMW uses the pair on certain models. The ACSM monitors the anchor tensioner independently, and when it reads chassis potential on that circuit it stores 0X93092B and disarms the system.

Location is the useful part of this code. The end fitting tensioner lives low, at the seat or the floor near the belt anchor bolt, so its wiring runs under the seat and across the sill area. That is the wettest, most trampled part of the interior, which is why anchor tensioner circuits fail more often from corrosion and crushing than from age.

Common causes

• Wiring crushed under the seat rail or by seat fore and aft travel
• Corrosion at the anchor tensioner connector from wet carpet or a leaking door seal
• A connector left loose or unlatched after seat removal
• An internally shorted anchor tensioner charge
• Harness insulation worn through against the seat frame or sill plate
• Damage from cargo, floor mats, or work done on the carpet and sound deadening

Crash data or hardware fault?

0X93092B is a live measurement of a circuit, which means it responds to repairs. Fix the ground path and the module stops reporting it. Deployment records do not respond to anything. They are written into module memory at the moment the tensioners fire and stay there permanently, which is the whole reason they exist.

Does our reset clear it?

Repair comes first here, since resetting a module does not change what a shorted wire reads. Trace the circuit under the seat and correct it. If the belt system already fired, the end fitting tensioner is a single-use device and the belt assembly needs to be replaced before anything else matters. At that point mail us the ACSM and we clear the stored crash data so the module can go back in the car.

Which makes throw it

BMW uses 0X93092B on models fitted with anchor-side belt tensioners. The code is read through BMW hex diagnostics and does not appear on other makes.

What to do next

Lift the seat and follow the anchor tensioner wiring by hand, checking for crush marks, corrosion, and a connector that never latched. Carpet that feels damp under the sill points at a water leak that needs fixing along with the wiring. If the tensioner itself reads shorted, plan on a genuine OEM belt assembly, and call 501-988-0611 if you need help identifying the right one. Related codes: 0X930925, 0X930931, 0X93090D.