B1941: Crash Sensor #1 Open Circuit
The B1941 code indicates an open circuit in the power or return line of the Crash Sensor #1 in the Supplemental Restraint System (SRS). This means the Restraints Control Module (RCM) has detected a loss of electrical continuity to or from the front crash sensor, preventing the system from properly monitoring collision conditions. Per SAE J2012, 'B1xxx' codes are manufacturer-specific body codes, historically applying to Ford Motor Company vehicles.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or internally open front crash sensor #1
- Cut or broken wiring in the power or return circuit
- Loose, corroded, or bent terminals in the crash sensor connector
- Short to ground or voltage in the sensor harness (per Ford-specific diagrams)
- Faulty Restraints Control Module (RCM) – rare
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- SRS system may be disabled, preventing airbag deployment in a crash
4. Step-by-Step Diagnosis
Scan for all SRS codes and note freeze frame data
Visually inspect the crash sensor #1 connector and wiring for damage, corrosion, or loose connections
Using a multimeter, check for continuity and proper voltage (typically 5V reference and ground) at the sensor connector
If wiring is intact, test the sensor itself by measuring resistance across its terminals (should be within manufacturer specs)
If sensor and wiring are good, suspect the RCM and perform further diagnostics per Ford service manual
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The SRS system may be disabled, meaning airbags may not deploy in a collision, increasing the risk of injury. Have the vehicle repaired immediately.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. A new crash sensor costs $50–$150, plus labor. Wiring repairs are usually $100–$200. RCM replacement is more expensive ($500–$1000).