B0086

Code

Generic B — Body

Third Row Left Seat Belt Load Limiter Deployment Control

Brand: Generic

Type: B — Body

Views: UK: 25 EN: 33 RU: 28

AI status

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Page language: EN

Causes

Seat belt load limiter/pretensioner has deployed (pyrotechnic activation) or is damaged
Open or short in wiring harness or connector to the load limiter/pretensioner
Corroded, loose, or damaged connector at the load limiter or SRS module
High resistance in the squib/igniter circuit (poor connection)
Water/moisture intrusion at seat wiring or connectors
Faulty SRS/airbag control module or software issue

Symptoms

SRS/Airbag warning lamp illuminated on instrument cluster
Possible additional SRS-related lamps or messages
Serviceability of that seat belt's pretensioner may be compromised (no activation in a crash)
Diagnostic trouble code present and may prevent system readiness
Code may not clear until component/circuit repaired or replaced

What to check

Read SRS/airbag module for B0086 and any related codes or deployment flags (freeze frame data)
Visually inspect the third-row left seat, seat belt, and pretensioner area for signs of deployment or damage
Inspect connectors and wiring routing under and around the seat for damage, corrosion, or loose pins
Check for any water/moisture or contamination in connectors and harness
Verify battery voltage and proper ground connections before diagnosing
Confirm if vehicle history shows prior deployment or collision repairs involving the third row

Signal parameters

Pretensioner/squib continuity: intact squib will show low resistance (typically a few ohms) — open/infinite indicates an open circuit
Short to battery (very low resistance to 12V) or short to ground may indicate wiring short
SRS module communication (CAN) should be normal — verify no communications faults with controller
After deployment the module may log a firing event / stored deployment flag in freeze-frame

Diagnostic algorithm

Read and record all SRS/airbag codes and freeze-frame data with a capable scan tool. Note any deployment history or related codes.
Do not attempt live resistance checks while the airbag system is armed. Disable the SRS system per manufacturer procedure: disconnect battery negative, wait the recommended time (typically several minutes) and follow vehicle-specific safety steps.
Visually inspect the third-row left seat belt pretensioner and surrounding area for signs of deployment (scorch, residue, deformation) or mechanical damage. If deployed, replace pretensioner and any associated harness/seat components.
With SRS disabled, disconnect the pretensioner connector and measure squib continuity/resistance at the connector. Compare to manufacturer specification. Open = replace; short/very low = shorted wiring or damage.
Inspect and repair any damaged wiring or corroded connectors. Perform backprobe/continuity checks from the pretensioner connector to the SRS module connector to locate opens/shorts.
After repairs, reconnect and re-enable SRS system. Use scan tool to clear codes and run a system self-test. Verify the B0086 does not return.
If the code returns with good wiring and replaced pretensioner, consider SRS module fault — consult manufacturer procedures for module diagnostics, possible module replacement and programming/re-coding.
If a deployment occurred, replace the pretensioner, any impacted wiring/seat components, and follow required procedures for SRS component replacement and module reset/programming.

Likely causes

Post-deployment pretensioner (load limiter) not replaced or still connected
Broken/abraded wiring under the seat (common where harness flexes)
Contaminated or corroded connector at the pretensioner
Open circuit in pretensioner squib (intentional safety disconnect after deployment)
Fault stored after deployment even if current wiring appears OK