B0076 — Third Row Left Seat Belt Pretensioner Deployment Control

Generic OBD-II · all makesBody

B0076 indicates a fault in the deployment control circuit for the third-row left seat belt pretensioner. The SRS module has detected an open, short, or abnormal resistance in the pyrotechnic firing loop that tightens that seat belt during a crash. This typically turns on the airbag warning light and stores the code until the circuit is repaired.

Symptoms

Airbag/SRS warning light illuminated on the instrument panel
"Service Airbag" or similar warning message displayed
Stored SRS fault code B0076 that returns after clearing
Pretensioner may not fire in a collision
No engine drivability symptoms
Possible additional SRS codes present

What causes it — most likely first

1. Faulty third-row left seat belt pretensioner

The pyrotechnic squib inside the seat belt retractor or buckle can develop an open or shorted winding, or its resistance can drift out of the acceptable range, causing the SRS module to set B0076.

2. Wiring harness damage in the pretensioner circuit

The two-wire deployment loop running beneath the third-row seat or along the floor can chafe, break, or short against the frame, changing circuit resistance enough to trigger the code.

3. Corroded or loose connector at the pretensioner

The connector under or behind the third-row left seat can loosen, corrode, or suffer terminal damage, introducing high resistance or an intermittent open in the firing loop.

4. Incorrect or salvage seat belt assembly

Replacement pretensioners with different internal resistance or incompatible wiring can be rejected by the SRS module, causing this code to set after service.

5. SRS control module fault

Although the SRS/SDM performs the monitoring, internal module damage is uncommon; it should only be considered after the pretensioner and its wiring have been verified good.

How it's diagnosed

Inspect the connector and harness at the third-row left seat belt pretensioner for corrosion, terminal damage, or looseness, and repair any visible issues.
With the battery disconnected and proper SRS safety precautions observed, measure the pretensioner squib resistance and compare it to manufacturer specifications.
Check continuity and insulation of the two deployment-loop wires between the pretensioner and the SRS module, looking for opens, shorts to ground, or shorts to each other.
Wiggle-test the harness and connector while monitoring the circuit to catch intermittent high-resistance faults caused by broken strands or poor contacts.
If the pretensioner and all wiring test within specification, evaluate the SRS control module with a scan tool capable of airbag diagnostics before condemning it.

Code facts & related codes

SystemBody

StandardizationSAE generic — identical on every make

Vehicles this code applies to

The definition is universal; the diagnostics are engine-specific. Open your vehicle for the codes documented for it:

2010 Land Rover LR4 2011 Land Rover LR4

Frequently asked

Is it safe to drive with code B0076?

The vehicle will drive normally, but the SRS system may be disabled or that pretensioner may not deploy in a crash, so you should have it diagnosed and repaired promptly.

Can I replace the third-row seat belt pretensioner myself?

SRS repairs involve pyrotechnic devices and require disabling the system, following static-discharge precautions, and often post-repair calibration; this work is best left to a qualified technician.

Do I need a new PCM or engine computer for B0076?

No. This is an SRS/airbag code, not an engine-management code. The problem is almost always the pretensioner, its wiring, or its connector. The SRS control module is rarely the cause and should not be replaced unless testing proves it has failed.

Why did the airbag light come back right after the code was cleared?

The SRS module continuously monitors the pretensioner circuit; if the underlying open, short, or resistance fault is still present, it will reset the code immediately during the next ignition cycle.