Driver Seat Occupancy Sensor Circuit Malfunction
The B1515 code indicates that the Restraints Control Module (RCM) or Occupant Classification Module (OCM) has detected an electrical fault in the driver seat occupancy sensor or switch circuit. This component sends a voltage signal to confirm the presence of an occupant, which is used for airbag deployment logic and seat belt monitoring. When the circuit has a short, open, or out-of-range reading, the module logs the fault and may disable related safety features.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty driver seat occupancy sensor or switch
- Damaged, corroded, or disconnected wiring or connectors between the sensor and control module
- Short to ground or voltage in the occupancy sensor circuit
- Open circuit in the sensor signal or reference wires
- Internal failure in the Restraints Control Module (RCM) or Occupant Classification Module (OCM)
- Physical damage to the seat cushion compromising sensor integrity
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Seat belt reminder or passenger airbag status indicator malfunctioning
4. Step-by-Step Diagnosis
Scan the vehicle for all stored codes and freeze frame data
Visually inspect the driver seat occupancy sensor wiring and connectors for damage, corrosion, or loose connections
Test the sensor circuit for shorts, opens, and proper voltage using a multimeter
Check the seat cushion for physical damage that could affect the sensor
If wiring and sensor are okay, test the RCM/OCM for internal faults or perform a module reset
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. This code indicates a fault in the occupant detection system, which can disable airbag deployment and seat belt warnings, increasing injury risk in a crash.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the sensor, wiring, or module needs replacement. Labor and diagnostic fees vary by shop.