B1941

Code

Other B — Body

Air Bag Crash Sensor #1 Feed/Return Circuit Open

Brand: Other

Type: B — Body

Views: UK: 28 EN: 31 RU: 35

AI status

Completed

ready

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Page language: EN

Causes

Open or broken wiring in the crash sensor feed/return circuit
Disconnected or corroded sensor connector/pins
Failed/crashed crash sensor
Poor or missing ground or power to the sensor circuit
Damage from prior collision or improper repairs
Faulty airbag control module (less common)

Symptoms

SRS / airbag warning lamp illuminated on instrument panel
Stored B1941 (and possibly related SRS) trouble code(s)
Associated airbag(s) or restraint functions may be disabled until repaired
No drivability symptoms (engine/run behavior typically unaffected)
Possible diagnostic messages or reduced restraint system readiness

What to check

Read and record codes and freeze frame with an OBD-II/SRS-capable scanner; note any related SRS codes
Visually inspect sensor #1 connector and wiring for damage, corrosion, or disconnection
Check connectors are fully seated and locking tabs intact
Perform continuity/resistance check between sensor connector and airbag control module with battery disconnected
Measure reference/return voltages at the sensor connector with ignition in the specified state (see service manual)
Wiggle test wiring while monitoring live data or continuity to reproduce intermittent opens

Signal parameters

Expected: continuity between the airbag control module and crash sensor pins (low resistance; typically close to 0 Ω—see manufacturer spec)
Open circuit: infinite resistance or no continuity between module and sensor
Reference/supply voltage: many SRS sensors use a low-voltage reference (e.g., ≈5 V) or battery feed depending on design — confirm with factory data
No short to battery or ground on the feed/return wires; shorted circuits will show very low resistance to B+ or ground
Live-data: many modules will show sensor present / plausible range when circuit is good; absent or ‘open’ when circuit fault exists

Diagnostic algorithm

Connect qualified SRS scan tool, record B1941 and any related codes, note freeze-frame data.
Disconnect battery negative and wait per manufacturer safety procedure before accessing SRS connectors.
Visually inspect crash sensor #1 connector and harness route for damage, corrosion, loose pins, or poor repair work.
With battery disconnected, check continuity between the sensor connector pins and the corresponding pins at the airbag control module. Replace or repair any open wiring.
Check resistance of the sensor (if published) against manufacturer specification. Replace sensor if out of spec or open internally.
Reconnect, reconnect battery per safety procedure, and with scanner monitor SRS live data/voltage at sensor connector (follow vehicle-specific test steps).
If wiring and sensor check good but fault persists, inspect grounds and power feeds for the SRS system and check for aftermarket modifications that may interfere.
If wiring, connector, and sensor are good, consider control module fault and refer to manufacturer diagnostics for module testing or replacement.
After repair, clear codes, perform SRS self-test, and verify no codes return; perform any required SRS calibration or initialization.

Likely causes

Wiring harness chafed, pinched, or severed near sensor or under dash
Connector pushed out, bent, or corroded at the sensor or module
Crash sensor internal failure (open circuit inside sensor)
Loose connector not fully seated after service or collision repair
Open or high-resistance ground or supply for the sensor circuit

Fault status

⚠️ Status

Open circuit detected in feed/return wiring to Air Bag Crash Sensor #1. SRS warning lamp will be on and crash sensor #1 may be unavailable until the open circuit is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours