Damaged, loose or corroded connector at the rear centre seat belt assembly or under the rear seat; Wiring fault (open circuit, chafing or short) between the restraint control module and the second row centre belt device, often from rear seat movement or cargo; Faulty or previously deployed seat belt load limiter or retractor assembly; Incorrect reassembly or disturbed connection after rear seat, trim or belt work; Water ingress or corrosion in the floor-level connectors; Faulty restraint control module or outdated module software, where the manufacturer lists it as a known cause.

B0084

Second Row Center Seat Belt Load Limiter Deployment Control.

Generic
Body
Generic code
Medium severity

How this code is built

B: SystemBody
0: Defined bySAE, the same on every car
0: AreaBody area 0
84: FaultThe specific fault in that area

What it means

B0084 is the generic code for a fault in the deployment control circuit for the second row centre seat belt load limiter. The load limiter is a pyrotechnic or controlled-release device that eases belt force on the occupant in a crash. The restraint control module (SRS module) runs a self-test on the circuit and sets this code when it sees an open circuit, short circuit or resistance outside the expected range. Exact wiring and component layout depend on the vehicle, so check the manufacturer's data for the model.

Symptoms

Airbag or SRS warning light on the dashboard
Rear centre seat belt may not be protected by the restraint system in a crash
Fault logged in the restraint control module, possibly alongside other rear seat belt codes
Possible failed MOT or safety inspection due to the lit SRS warning lamp
Rear centre belt pretensioner or load limiter may feel or look damaged or disturbed after seat removal

Possible causes

Damaged, loose or corroded connector at the rear centre seat belt assembly or under the rear seatlikely
Wiring fault (open circuit, chafing or short) between the restraint control module and the second row centre belt device, often from rear seat movement or cargolikely
Faulty or previously deployed seat belt load limiter or retractor assemblypossible
Incorrect reassembly or disturbed connection after rear seat, trim or belt workpossible
Water ingress or corrosion in the floor-level connectorspossible
Faulty restraint control module or outdated module software, where the manufacturer lists it as a known causerare

How to diagnose

Read all stored and pending codes from the restraint control module, noting any other rear seat belt or SRS codes and whether the fault is current or history
Record freeze frame or status data if available, and check for any recent crash, seat removal or trim work
Visually inspect the rear seat area, the centre belt anchorage and the wiring for damage, trapped harnesses, moisture or corrosion
Following the manufacturer's SRS safety procedure (disconnect the battery and wait the specified time), check the connectors at the belt device and the module for security, bent pins and corrosion
Do not probe, test or apply a test lamp or multimeter to deployment circuits; use only the manufacturer's approved method to check circuit resistance
Check the manufacturer's data for technical bulletins or software updates for this model
Clear the code after repair, then confirm it does not return and the warning light goes out after a self-test

How to fix

Clean, repair or replace damaged or corroded connectors, and secure the harness away from moving parts
Repair or replace damaged wiring between the control module and the centre belt device as specified by the manufacturer
Replace the second row centre seat belt assembly if the load limiter or retractor is faulty or has been deployed
Refit the rear seat, trim and connectors correctly if they were disturbed
Update or replace the restraint control module only if diagnosis confirms it is at fault or the manufacturer specifies an update for this fault

Can I keep driving?

Medium severity

The car can usually be driven, but the rear centre belt may not give full crash protection, so book the repair soon. Avoid carrying a passenger in the rear centre seat until it is fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.