Air Bag Crash Sensor #2 Feed/Return Circuit Open
The airbag system can't communicate with crash sensor #2 because the electrical wire connecting it is broken, disconnected, or corroded. It's like a phone line being cut—the sensor can't send its signal to the airbag control module.
The SRS control module monitors the feed and return circuit voltage to crash sensor #2, expecting a complete circuit with normal voltage levels. When an open circuit is detected, the module cannot verify sensor functionality and triggers the fault code. The ECU continuously checks for circuit continuity and proper signal transmission.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Voltage | 4.5-5.5V with valid signal | 0V or open circuit detected |
| Circuit Resistance | <10 ohms end-to-end | >100 ohms or infinite resistance |
Code B1942 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B1942 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.