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Home / DTC / B1409 — FR impact sensor No COM.

B1409 — FR impact sensor No COM.

Detailed page for trouble code B1409.

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Code

B1409

MITSUBISHI B — Body

FR impact sensor No COM.

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or disconnected FR impact sensor connector
  • Corroded or bent pins in the sensor or SRS harness connector
  • Open, shorted, or damaged wiring between the FR impact sensor and SRS control module
  • Faulty FR impact sensor (internal failure)
  • Fault or software/firmware error in SRS/airbag control module
  • Water intrusion or contamination at sensor or connectors

Symptoms

  • Airbag warning lamp (SRS) illuminated on instrument cluster
  • Possible stored SRS/airbag related diagnostic trouble codes
  • Reduced or disabled airbag deployment capability for affected zone until repaired
  • Fault may be intermittent if wiring or connector is loose

What to check

  • Read and record all SRS/airbag diagnostic codes and freeze-frame data with a capable scan tool
  • Inspect FR impact sensor connector and wiring for corrosion, damage, bent pins, moisture or signs of impact repair
  • Check for related codes that indicate bus or module communication issues
  • Verify battery voltage and fuses related to SRS power supply
  • Perform a wiggle test on harness with scan tool connected to see if code/fault toggles
  • If available, use an oscilloscope or data-logger to observe SRS bus/data line activity while commanding or monitoring SRS status

Signal parameters

  • No response from FR impact sensor on the SRS network / no periodic status messages
  • Sensor supply voltage present when key on (verify manufacturer spec)
  • Ground continuity to sensor chassis ground (low resistance)
  • Expect digital/status packets from sensor to SRS; instead shows loss-of-communication or timeout
  • On event, sensor should transmit a distinct crash/wake signal (absent when code present)

Diagnostic algorithm

  1. Follow safety procedures for SRS work: disable the SRS power source per manufacturer instructions before disconnecting connectors or removing components.
  2. Connect a capable SRS scan tool and note all stored codes and live data. Clear codes and attempt to reproduce to confirm fault persists.
  3. Visually inspect the FR impact sensor, its mounting, and connector for damage, water ingress, corrosion, or loose pins.
  4. With battery connected and SRS enabled (only if safe and per manufacturer guidance), check for proper supply voltage and ground at the FR impact sensor connector. Compare to manufacturer spec.
  5. Check continuity between the FR impact sensor connector and the SRS control module for the communication, power, and ground circuits. Look for opens, shorts to ground or to battery, and high resistance.
  6. If wiring and connectors check good, swap the FR impact sensor with an identical known-good sensor (if available and allowed by manufacturer) or substitute with a known-good sensor on vehicle to see if code follows sensor.
  7. If fault remains after verifying sensor and harness, inspect/repair SRS module connector and grounds. Consider module fault and consult manufacturer diagnostics for SRS module replacement/repair procedures.
  8. After repairs, reconnect everything, clear codes, and verify vehicle returns to normal SRS status. Perform final road or functional checks as required by manufacturer.

Likely causes

  • Poor connector connection or corrosion at the FR impact sensor
  • Damaged wiring (chafing, broken conductor, short to ground/12V) between sensor and SRS module
  • Failed FR impact sensor
  • SRS control module communication fault

Fault status

⚠️ Status
Front-right impact sensor: no communication/response to SRS control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1408 B1410 B1411 B1500 U0073 U0100
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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