Code Definition

B1943 — Airbag Crash Sensor #1 Ground Circuit Short To Ground

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1943

B1943 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1943 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1943 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Restraints Control Module (RCM) provides a dedicated low side ground return for each remote front impact sensor rather than relying on a generic chassis ground, so the module can monitor the integrity of the sensor circuit independently. DTC B1943 is set when the RCM detects that the dedicated ground return for crash sensor number 1 has become shorted to chassis ground at an unintended point, typically through harness chafe, a damaged sensor body, or moisture ingress at the connector. This loss of ground isolation can cause incorrect sensor signal interpretation and disables airbag deploym...

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