Skip the auto shop - Our mechanics make house calls

B1943 OBD-II Trouble Code: Airbag Crash Sensor #1 Short to Ground

diagnostic check engine light

B1943 code definition

A B1943 code means that the vehicle’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 B1943 code means

Air bag systems are designed to perform self-diagnostics. In the event of a B1943 code, voltages are off spec at certain terminals in the system, registering a trouble code as part of the self-diagnostic process.

What causes the B1943 code?

  • Short circuit in #1 crash sensor
  • Open circuit in left front impact sensor

What are the symptoms of the B1943 code?

How does a mechanic diagnose the B1943 code?

  • Using a good quality code reader/scanner, check for any airbag-related trouble codes. B1942. B1941, 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. Check for any dirt, corrosion, damage or other physical problems with sensor, wiring, terminals and connectors.
  • Disconnect air bag diagnostic monitor and check resistance on terminals. NOTE: disconnecting the diagnostic monitor disables 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 vehicle to see if codes return.

Common mistakes when diagnosing the B1943 code

As with many codes, technicians often jump ahead on a B1943 code without doing a proper process of elimination and end up replacing parts unnecessarily.

How serious is the B1943 code?

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

What repairs can fix the B1943 code?

Additional comments for consideration regarding the B1943 code

On many Ford vehicles, the air bag warning light will flash to alert the driver to a problem. The light will flash an indication of the code itself. In this case, it would flash four times, followed by a pause, followed by three flashes to denote 43.

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

Need help with a B1943 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...


Related questions

Q: I got code P0016 and P0008. I just want to know what caused the problem and which one is bank 1 sensor A?

Hello, this problem (both codes apply to the same problem) relates to a calculated "bad timing correlation" between the crankshaft and the exhaust camshaft for cylinder 1 (cylinder head at front of the car). Engine management has tolerances for the...

Q: How do I know that my OBD system is working right?

The OBD system on your vehicle is a self-monitoring system. The Powertrain Control Module monitors and controls all of the systems and functions that regulate fuel, ignition, emissions, and engine cooling as well as having some minor control over air...

Q: The airbag light is on, could it be caused by previous work done on the car?

The SRS (Airbag) light comes on when the controller has sensed a malfunction somewhere in the system. The malfunction may be an open circuit or an incorrect voltage at any of the sensors. When the controller sees the error, it...