05-02-2025
8 min.
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B0058 Third Row Right Seat Belt Sensor Fault

The B0058 Third Row Right Seat Belt Sensor Fault diagnostic trouble code indicates that the vehicle's Supplemental Restraint System (SRS) or body control system has detected a problem with the right-side seat belt sensor in the third row.

The sensor is part of the vehicle's seat belt monitoring and occupant restraint system. Depending on the vehicle, it may monitor whether the seat belt is buckled, whether the buckle mechanism is in the expected position, or whether the seat belt circuit is functioning correctly.

When the restraint control module detects an abnormal signal from the third-row right seat belt sensor, it can store B0058 and may illuminate the airbag/SRS warning light or display a seat-belt warning.

The exact sensor configuration varies between manufacturers. Some vehicles use a buckle switch, while others combine seat occupancy, belt-buckle, pretensioner, or seat-position information into the restraint system.

What Does B0058 Mean?

B0058 generally identifies a fault associated with the third-row right seat belt sensing circuit.

The restraint control module expects to receive a specific electrical signal from the seat belt sensor or buckle switch.

The system may use this information to determine:

Whether the seat belt is buckled
Whether the buckle is unbuckled
Whether a passenger is occupying the seat
Whether a restraint warning should be activated
Whether the appropriate restraint system should be deployed during a collision

If the signal is missing, outside the expected range, intermittent, or inconsistent with other restraint-system information, the module can store B0058.

Possible problems include:

Faulty seat belt buckle sensor
Damaged seat belt sensor wiring
Loose connector
Corroded terminals
Short circuit
Open circuit
Damaged seat belt buckle
Wiring damage under the third-row seat
Restraint control module fault

What Is the Third-Row Right Seat Belt Sensor?

The third-row right seat belt sensor is normally associated with the right-side seating position in the vehicle's third row.

Depending on the vehicle, the sensor may be incorporated into the seat belt buckle or associated with the restraint system wiring.

Its primary purpose is to provide the restraint control system with information about the seat belt condition.

For example:

Seat Belt Unbuckled

The sensor sends a signal indicating that the belt is not secured.

Seat Belt Buckled

The signal changes when the buckle is latched.

The vehicle can then use this information for the seat belt warning system and, on some vehicles, for restraint-system deployment strategies.

Symptoms of B0058

The symptoms can vary depending on the vehicle and the exact nature of the fault.

Airbag or SRS Warning Light

The most important symptom is often an illuminated airbag/SRS warning light.

Seat Belt Warning

The vehicle may incorrectly indicate that the third-row right seat belt is unbuckled.

Incorrect Seat Belt Warning

The warning may remain active even when the belt is properly fastened.

No Seat Belt Warning

In some cases, the system may fail to recognize that the seat belt is unbuckled.

Warning Chime

The vehicle may produce an unexpected seat belt warning sound.

Third-Row Restraint Warning

Some vehicles may display a message relating specifically to the third-row seating position.

Intermittent Warning Light

If the wiring or connector has an intermittent problem, the SRS warning light may appear and disappear as the seat is moved or the harness is disturbed.

No Noticeable Symptoms

The vehicle may drive normally because B0058 is associated with the restraint system rather than the engine or transmission.

Common Causes of B0058

Several electrical and mechanical problems can trigger this code.

Faulty Seat Belt Sensor or Buckle Switch

The sensor inside the third-row right buckle can fail because of:

Internal electrical failure
Mechanical wear
Contamination
Damaged switch contacts
Normal component aging

Damaged Wiring

Third-row seat belt wiring can be particularly vulnerable because rear seats may be folded, moved, removed, or adjusted.

Possible wiring problems include:

Broken wires
Pinched wires
Chafed insulation
Open circuits
Short circuits
High resistance

Loose Electrical Connector

A connector may become partially disconnected after:

Seat removal
Interior repairs
Carpet work
Cargo-area modifications
Seat folding

Corroded Connector Terminals

Moisture entering the rear passenger compartment can cause:

Terminal corrosion
Increased resistance
Intermittent connections
Signal loss

Damaged Seat Belt Buckle

The buckle itself may be physically damaged or may not properly operate the internal switch.

Objects or Cargo Damaging the Harness

Heavy cargo placed in the rear compartment can pinch or damage the wiring leading to the third-row seat.

Previous Interior or Seat Repairs

B0058 can sometimes appear after work involving:

Seat removal
Carpet replacement
Interior trim removal
Electrical modifications
Audio-system installation

Restraint Control Module Fault

A module fault is possible but generally should be considered after the sensor circuit, wiring, connectors, and buckle have been tested.

Vehicles Commonly Affected by B0058

B0058 can be found on vehicles equipped with third-row seating and electronically monitored restraint systems.

Potential applications can include:

Chevrolet Tahoe
Chevrolet Suburban
GMC Yukon
Cadillac Escalade
Ford Expedition
Ford Explorer
Lincoln Navigator
Toyota Sequoia
Toyota Land Cruiser
Toyota Highlander
Nissan Armada
Nissan Pathfinder
Infiniti QX80
Jeep Grand Cherokee L
Dodge Durango
Volkswagen Atlas
Audi Q7
Volvo XC90
Mercedes-Benz GLS
BMW X7
Kia Telluride
Hyundai Palisade

This is an example list rather than a definitive application list.

The exact definition of B0058 can vary by manufacturer, model year, restraint-control module, and seat-belt system configuration. The vehicle-specific diagnostic information should therefore be used to confirm the exact component.

How B0058 Is Diagnosed

B0058 should be diagnosed using an SRS/airbag-capable diagnostic scanner.

A basic engine diagnostic scanner may not be able to communicate with the restraint control module.

Scan the SRS Module

First, retrieve:

Stored SRS codes
Current codes
History codes
Manufacturer-specific subfaults
Freeze-frame information, if available

Other SRS codes can help determine whether B0058 is an isolated seat belt circuit problem.

Inspect the Third-Row Right Seat Belt

Check the seat belt buckle and surrounding area for:

Physical damage
Foreign objects
Loose mounting
Mechanical problems
Signs of contamination

The buckle should latch and release normally.

Inspect the Wiring Harness

The wiring leading to the third-row right seat belt should be carefully inspected.

Look for:

Pinched wires
Broken wires
Chafed insulation
Exposed conductors
Incorrect repairs
Harness damage caused by folding seats

Inspect the Connector

Check the seat belt sensor connector for:

Loose connection
Corrosion
Bent terminals
Damaged locking mechanism
Water intrusion

A connector that appears connected may still have poor terminal contact.

Check the Sensor Circuit

Following the manufacturer's SRS diagnostic procedure, technicians can test:

Circuit continuity
Resistance
Short-to-ground conditions
Short-to-power conditions
Signal voltage

The exact test procedure should always follow manufacturer specifications.

Important: SRS circuits can involve pyrotechnic components such as seat belt pretensioners. Technicians should follow the manufacturer's safety procedures and disable the restraint system as specified before testing or disconnecting components.

Monitor Live SRS Data

If supported by the diagnostic tool, the technician can monitor the third-row right seat belt status.

The data should change appropriately when the seat belt is:

Buckled
Unbuckled

If the live data does not correspond to the physical condition of the belt, the sensor or circuit becomes a stronger suspect.

How to Fix B0058

The correct repair depends on the confirmed cause.

Repair Damaged Wiring

Possible repairs include:

Repairing broken conductors
Replacing damaged wiring
Repairing pinched sections
Restoring proper insulation
Securing the harness away from moving seat components

Repair or Replace the Connector

If the connector is damaged, repairs may include:

Replacing terminals
Repairing the connector housing
Correcting terminal tension
Cleaning corrosion when appropriate

Replace the Seat Belt Buckle or Sensor

If testing confirms that the third-row right seat belt sensor or buckle switch is defective, the affected component may need to be replaced.

On some vehicles, the sensor is integrated into the seat belt buckle and is not separately serviceable.

Repair the Restraint Control Module

If the wiring, connector, and sensor all test correctly, the SRS control module may need further diagnosis.

Depending on the vehicle, this could involve:

Software programming
Module configuration
Professional module repair
Module replacement

Clear the Code and Perform an SRS Test

After the repair:

Follow the manufacturer's SRS safety procedure.
Clear the B0058 fault.
Check live seat belt status.
Verify that the warning light remains off.
Perform a complete SRS diagnostic scan.
Confirm that no related restraint codes remain.

Can You Drive With B0058?

The vehicle may continue to drive normally with B0058 because the fault does not usually affect the engine or transmission.

However, B0058 should not be ignored because it involves the vehicle's restraint system.

If the SRS warning light is illuminated, there may be a problem with the vehicle's ability to correctly monitor or manage part of the restraint system.

Until the fault is diagnosed, the safety performance of the affected seating position should not be assumed to be normal.

If the vehicle has been involved in a collision, or if the airbag/SRS warning light remains illuminated, professional inspection is particularly important.

Is B0058 a Serious Code?

B0058 should be considered an important safety-related diagnostic trouble code.

It may only involve a seat belt monitoring circuit, but the exact consequences depend on the vehicle's restraint-system design.

A fault can potentially affect:

Seat belt warning operation
Occupant detection
Restraint-system monitoring
Seat belt pretensioner monitoring
SRS system readiness

An illuminated SRS warning light means the restraint system requires diagnosis.

How to Prevent B0058

Several maintenance practices can reduce the risk of seat belt sensor problems.

Recommended practices include:

Avoid placing heavy cargo on seat belt wiring.
Check wiring after folding or removing third-row seats.
Keep seat belt connectors protected from moisture.
Do not modify SRS wiring.
Repair damaged interior wiring promptly.
Make sure seat belt buckles remain clean and functional.
Avoid forcing or twisting seat belt components.
Address SRS warning lights immediately.
Have restraint-system repairs performed according to manufacturer procedures.

B0058 vs. Other Seat Belt and SRS Codes

B0058 belongs to a broader group of body and restraint-system diagnostic codes.

Code	Description
B0058	Third Row Right Seat Belt Sensor Fault
B0059	Third Row Left Seat Belt Sensor Fault
B0060	Third Row Center Seat Belt Sensor Fault
B0061	Third Row Seat Belt Sensor Circuit Fault
B0062	Seat Belt Sensor Circuit Fault

Exact descriptions and code assignments can vary between manufacturers, so vehicle-specific service information should always take priority.

Final Thoughts

The B0058 Third Row Right Seat Belt Sensor Fault diagnostic trouble code indicates that the vehicle's restraint-control system has detected an abnormal condition involving the right-side seat belt sensor in the third row.

Common causes include:

Faulty seat belt sensor
Defective buckle switch
Damaged wiring
Pinched harness
Loose connector
Corroded terminals
Damaged seat belt buckle
Previous seat or interior repairs
Restraint control module problems

The best diagnostic approach is to scan the SRS module, inspect the third-row right seat belt and wiring, check the connector, monitor live seat belt status, and test the circuit according to the manufacturer's specifications.

Because this is a safety restraint-system fault, the code should not simply be cleared without identifying and repairing the underlying problem. SRS components and wiring should be handled using the manufacturer's required safety procedures.