2003 Mercury Grand Marquis OBD2 Code B1941 Airbag Crash Sensor #1 Feed/Return Circuit Open

B1941 code definition

A B1941 code means that your 2003 Mercury Grand Marquis '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 2003 Mercury Grand Marquis 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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