2017 Volvo S90 OBD2 Code B1941 Airbag Crash Sensor #1 Feed/Return Circuit Open

B1941 code definition

A B1941 code means that your 2017 Volvo S90 's onboard diagnostic system has detected a discrepancy in the voltages to two terminals in the airbag circuit, and has registered a trouble code.

### What the B1941 code means Air bag systems are designed to perform self-diagnostics. Voltage at terminal #17 of the diagnostic monitor connector is supposed to stay at 9-11 volts. Circuit #617 is connected to Circuit #624, at the right front impact sensor. If voltage at terminal #2 drops below the voltage at terminal #17 , a B1941 code will be set.

What causes the B1941 code?

• Open circuit at terminal #617 or #624
• Open circuit in right front impact sensor

What are the symptoms of the B1941 code?

• Flashing or illuminated airbag lamp on dash

How does a mechanic diagnose the B1941 code?

• Using a good quality code reader/scanner, check for any airbag-related trouble codes. B1942. B1943, B1944 and B1945 may accompany this trouble code.
• A factory wiring diagram will also be necessary for this diagnosis and repair.
• With the ignition in ON position and headlamp switch OFF, connect the scanner and check for trouble codes.
• Locate right front impact sensor. Check connectors, wiring and crimps for an intermittent problem. Perform a wiggle test.
• Disconnect air bag diagnostic monitor. Measure resistance between terminals #2 and #17 of diagnostic monitor connector. NOTE: disconnecting the diagnostic monitor deactivates the entire airbag system.
• If resistance is less than 2 ohms, replace diagnostic monitor.
• If resistance is greater than 2 ohms, disconnect right front impact sensor from harness.
• Measure resistance between the sensor connector's pink/orange and yellow/white wires.
• Resistance should be less than 2 ohms. Locate and repair any open circuits found in #617 or #624.
• If resistance is greater than 2 ohms, replace entire right front impact sensor.
  
• Clear diagnostic codes and test drive 2017 Volvo S90 to see if codes return.

Common mistakes when diagnosing the B1941 code

As with many codes, technicians often jump ahead on a B1941 code without doing a proper process of elimination and end up replacing parts unnecessarily.

How serious is the B1941 code?

A B1941 code can result in the airbag not deploying in a collision.

What repairs can fix the B1941 code?

• Replacement of right front crash sensor
• Replace/repair of wiring and connectors

Additional comments for consideration regarding the B1941 code

Any airbag-related work might be best left up to a professional. Accidental deployment of the airbag can result in serious injury.

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