B1942: Front Impact Sensor #2 Open Circuit
Diagnostic trouble code B1942 indicates that the Restraint Control Module (RCM) has detected an open circuit in the power or ground line of the front impact sensor #2, typically located on the passenger side or a specific front area. This prevents the RCM from receiving the reference signal or acceleration data needed to assess the severity of a frontal collision.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged, corroded, or disconnected wiring or connectors in the front impact sensor #2 circuit
- Defective front impact sensor #2 (internal open circuit)
- Internal failure of the Restraint Control Module (RCM)
- Improper installation or unrepaired damage from a previous collision
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Supplemental Restraint System (SRS) fault stored in the RCM
4. Step-by-Step Diagnosis
Scan the RCM for trouble codes and verify B1942 is present.
Visually inspect the front impact sensor #2 and its wiring harness for damage, corrosion, or loose connections.
Test the sensor's resistance and voltage supply using a multimeter; compare with manufacturer specifications.
If wiring and sensor check out, suspect a faulty RCM and perform further module diagnostics.
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. An open circuit in the impact sensor can prevent airbag deployment in a frontal collision, increasing the risk of injury.
How much does it cost to fix?▼
Repair costs typically range from $150 to $500, depending on whether the issue is a wiring repair, sensor replacement, or RCM replacement.