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Home / DTC / B1583 — FL impact sensor ID fault

B1583 — FL impact sensor ID fault

Detailed page for trouble code B1583.

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22,491specific
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B1583

MITSUBISHI B — Body

FL impact sensor ID fault

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

Causes

  • Incorrect or non‑programmed replacement impact sensor (wrong part or missing ID registration)
  • Damaged, corroded or loose connector at the FL impact sensor
  • Open, short, or high‑resistance wiring between FL sensor and SRS ECU
  • Faulty FL impact sensor electronics (internal failure)
  • SRS ECU software/firmware fault or lost sensor registration
  • Low battery voltage or poor ground affecting sensor communication

Symptoms

  • SRS/Airbag warning light illuminated on instrument cluster
  • SRS system may log multiple related airbag/impact sensor DTCs
  • Possible disabling of front airbag or seatbelt pretensioner circuits (system dependent)
  • Diagnostic trouble codes stored in SRS ECU and possibly reduced SRS functionality

What to check

  • Use OEM scan tool to read DTCs, freeze frame data and live sensor ID values
  • Visually inspect FL impact sensor and connector for damage, corrosion, water intrusion, or improper repair work
  • Check battery voltage and main ground integrity before testing SRS circuits
  • Verify sensor ID reported by the SRS ECU using factory scan tool (compare to expected/printed part ID)
  • Backprobe connector for reference voltage and ground with ignition ON (follow OEM safety procedures)
  • Perform continuity and resistance checks on wiring between sensor and SRS ECU (pin‑to‑pin)

Signal parameters

  • Sensor ID code reported to SRS ECU (hex or decimal) — must match expected/registered ID
  • Supply voltage at sensor connector with ignition ON (~12 V or as specified by OEM)
  • Ground continuity to chassis ground from sensor ground pin
  • Data/communication line activity (CAN or LIN, if sensor communicates digitally)
  • Analog piezo/impact sensor signal (voltage spikes during impact event)
  • Wire resistance/continuity values between sensor and ECU pins (Ω)

Diagnostic algorithm

  1. Read and record all stored SRS codes and freeze frame/vehicle status using a Mitsubishi‑capable scan tool. Note sensor ID value reported by ECU.
  2. Before touching SRS components, follow safety procedure: turn ignition OFF, disconnect battery negative terminal and wait manufacturer recommended time to discharge SRS capacitors.
  3. Visually inspect FL impact sensor, mounting, and connector for damage, corrosion, bent pins, or water intrusion. Repair or replace damaged connectors/wiring as needed.
  4. Reconnect battery and with scan tool, monitor the FL sensor ID and live data while backprobing the connector. Verify supply voltage and ground presence with ignition ON (compare to spec).
  5. Check continuity and resistance between sensor connector and SRS ECU pins with ignition OFF. Repair any open or high‑resistance wiring or poor grounds.
  6. If wiring and connector are good but ID still incorrect, verify the part number/ID printed on the sensor. If replacement sensor was fitted, confirm that it is the correct programmed type and properly registered to the SRS ECU per OEM procedure.
  7. If possible, substitute a known‑good FL impact sensor (or swap with another side if allowed by OEM) to determine if the sensor itself is faulty.
  8. If a new sensor is installed or swapped, perform required SRS initialization/module registration with the factory scan tool. Clear codes and retest road/ignition cycles to confirm fault does not return.
  9. If problem persists after wiring and sensor replacement and proper registration, suspect SRS ECU fault and refer to manufacturer service documentation for ECU bench testing or replacement.

Likely causes

  • Connector damage/corrosion or loose connector at FL impact sensor
  • Incorrect replacement sensor (ID mismatch) or sensor not registered to SRS ECU
  • Open/short/high resistance in harness between sensor and SRS ECU
  • Failed FL impact sensor

Fault status

⚠️ Status
FL impact sensor ID mismatch or no valid ID reported to SRS control unit — FL impact sensor communication/identification fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1580 B1581 B1582 B1584 B1585
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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Code

B1583

Other B — Body

Dim Panel Decrease Input Circuit Failure

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

Causes

  • Incorrect or non‑programmed replacement impact sensor (wrong part or missing ID registration)
  • Damaged, corroded or loose connector at the FL impact sensor
  • Open, short, or high‑resistance wiring between FL sensor and SRS ECU
  • Faulty FL impact sensor electronics (internal failure)
  • SRS ECU software/firmware fault or lost sensor registration
  • Low battery voltage or poor ground affecting sensor communication

Symptoms

  • SRS/Airbag warning light illuminated on instrument cluster
  • SRS system may log multiple related airbag/impact sensor DTCs
  • Possible disabling of front airbag or seatbelt pretensioner circuits (system dependent)
  • Diagnostic trouble codes stored in SRS ECU and possibly reduced SRS functionality

What to check

  • Use OEM scan tool to read DTCs, freeze frame data and live sensor ID values
  • Visually inspect FL impact sensor and connector for damage, corrosion, water intrusion, or improper repair work
  • Check battery voltage and main ground integrity before testing SRS circuits
  • Verify sensor ID reported by the SRS ECU using factory scan tool (compare to expected/printed part ID)
  • Backprobe connector for reference voltage and ground with ignition ON (follow OEM safety procedures)
  • Perform continuity and resistance checks on wiring between sensor and SRS ECU (pin‑to‑pin)

Signal parameters

  • Sensor ID code reported to SRS ECU (hex or decimal) — must match expected/registered ID
  • Supply voltage at sensor connector with ignition ON (~12 V or as specified by OEM)
  • Ground continuity to chassis ground from sensor ground pin
  • Data/communication line activity (CAN or LIN, if sensor communicates digitally)
  • Analog piezo/impact sensor signal (voltage spikes during impact event)
  • Wire resistance/continuity values between sensor and ECU pins (Ω)

Diagnostic algorithm

  1. Read and record all stored SRS codes and freeze frame/vehicle status using a Mitsubishi‑capable scan tool. Note sensor ID value reported by ECU.
  2. Before touching SRS components, follow safety procedure: turn ignition OFF, disconnect battery negative terminal and wait manufacturer recommended time to discharge SRS capacitors.
  3. Visually inspect FL impact sensor, mounting, and connector for damage, corrosion, bent pins, or water intrusion. Repair or replace damaged connectors/wiring as needed.
  4. Reconnect battery and with scan tool, monitor the FL sensor ID and live data while backprobing the connector. Verify supply voltage and ground presence with ignition ON (compare to spec).
  5. Check continuity and resistance between sensor connector and SRS ECU pins with ignition OFF. Repair any open or high‑resistance wiring or poor grounds.
  6. If wiring and connector are good but ID still incorrect, verify the part number/ID printed on the sensor. If replacement sensor was fitted, confirm that it is the correct programmed type and properly registered to the SRS ECU per OEM procedure.
  7. If possible, substitute a known‑good FL impact sensor (or swap with another side if allowed by OEM) to determine if the sensor itself is faulty.
  8. If a new sensor is installed or swapped, perform required SRS initialization/module registration with the factory scan tool. Clear codes and retest road/ignition cycles to confirm fault does not return.
  9. If problem persists after wiring and sensor replacement and proper registration, suspect SRS ECU fault and refer to manufacturer service documentation for ECU bench testing or replacement.

Likely causes

  • Connector damage/corrosion or loose connector at FL impact sensor
  • Incorrect replacement sensor (ID mismatch) or sensor not registered to SRS ECU
  • Open/short/high resistance in harness between sensor and SRS ECU
  • Failed FL impact sensor

Fault status

⚠️ Status
FL impact sensor ID mismatch or no valid ID reported to SRS control unit — FL impact sensor communication/identification fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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B1580 B1581 B1582 B1584 B1585
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