B1675 — Seat Driver Occupied Input Circuit Short To Ground

OBD2 code B1675 flags a problem with the body electrical system (seat driver occupied input circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.

body electrical

Is it safe to drive?

Short-term driving is OK Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1675 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1675 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1675 (parts and labor, USD, independent shop rates): Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250; BCM repair or replacement: $300–$900. Overall, fixing B1675 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code B1675 mean?

What is the most common cause of B1675?

The most common causes are: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.

Is it safe to drive with B1675?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How much does it cost to fix B1675?

Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250; BCM repair or replacement — $300–$900. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose B1675 myself?

Start with a scan: confirm B1675, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

B1675 is a body electrical fault code that indicates the vehicle's control module has detected a short to ground on the driver seat occupied input circuit. This falls within the B-series codes that cover body control systems rather than engine or transmission functions. When the module monitors this circuit and the electrical resistance drops to near-zero (a direct ground), it recognizes the abnormal condition and stores the trouble code after the fault persists long enough to meet the OBD2 trip criteria.

The driver seat occupied sensor feeds information to multiple systems, including the airbag module, seat belt reminder, and sometimes the power seat adjustment memory. When the circuit shorts to ground, those downstream modules lose the "occupied" signal, which can affect seat-related functions or trigger warning indicators. The ECU stores B1675 once it confirms the condition across consecutive drive cycles, and the accompanying freeze frame data captures engine speed, load, temperature, and vehicle speed at the exact moment the fault was recorded.

Common Symptoms of B1675

The seat occupancy indicator may show incorrect status or fail to register when the driver is seated
Airbag readiness light could illuminate due to conflicting seat occupancy data
Power seat adjustments may stop responding or behave unpredictably
Seat belt reminder system may activate inappropriately
Other body electrical functions connected to the same circuit may operate intermittently or fail
Check engine or warning lights may appear on the instrument cluster
Engine performance remains unaffected in most vehicles

Likely Causes

The most frequent culprit for B1675 is damaged wiring in areas where the harness flexes repeatedly, particularly in the door jamb or under the seat track where wires bend each time the seat moves. Corroded connectors from moisture intrusion rank second, followed by failed seat occupancy sensors themselves. Less commonly, a blown fuse in the related circuit or a faulty body control module can trigger this code.

Wiring damage at seat adjustment tracks or door hinges
Corroded or loose electrical connectors near the seat or door frame
Failed seat occupancy sensor or switch
Blown fuse or failed relay in the body circuit
Body control module (BCM) malfunction
Water damage to wiring from leaking seals or car washes

How to Diagnose B1675

Connect an OBD2 scanner and confirm B1675 is stored, then record all freeze frame data—this shows the exact conditions when the module detected the fault.
Check for any related diagnostic trouble codes that might point to the root cause, and search manufacturer TSB databases for your specific make, model, and year since many body electrical faults have documented factory fixes.
Perform a thorough visual inspection of the wiring harness beneath the driver seat and along the door jamb, looking for broken insulation, chafing, or corroded pins in connectors.
Test the seat occupancy sensor circuit with a multimeter for proper resistance and ground integrity, and wiggle the harness while monitoring readings to reveal intermittent opens.
Inspect all ground points for the BCM circuit and verify fuses are intact before clearing the code and performing a test drive that reproduces the freeze frame conditions.

Repair Options and Cost

The most practical approach is addressing the cheapest possible causes before replacing major components. Wiring repairs typically cost $80–$250 for labor and materials when the issue involves damaged insulation or broken strands at flex points. Replacing a faulty seat occupancy sensor or switch generally runs $120–$450 depending on the part price and labor at your location. If the BCM itself is defective, repair or replacement typically costs $300–$900.

Overall, fixing B1675 ranges from $80 to $900 depending on which component failed. A methodical diagnosis before purchasing parts always saves money—the BCM replacement scenario represents the worst case and should be your last resort after eliminating simpler explanations.

Driving Safety Verdict

B1675 typically poses no direct threat to engine operation or braking, so most drivers can continue operating the vehicle safely. However, if the faulty seat occupancy sensor affects airbag deployment, that represents a long-term safety concern worth addressing promptly. Reduced visibility from failed wipers or exterior lighting in poor weather conditions also warrants immediate attention. Have the underlying cause diagnosed and repaired within a reasonable timeframe to restore full vehicle safety systems.