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Home / DTC / B1582 — FR impact sensor ID fault

B1582 — FR impact sensor ID fault

Detailed page for trouble code B1582.

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Code

B1582

MITSUBISHI B — Body

FR impact sensor ID fault

Brand: MITSUBISHI
Type: B — Body
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Page language: EN

Causes

  • Open, short or intermittent wiring between the FR impact sensor and the SRS ECU
  • Corroded, loose or damaged sensor connector or terminals
  • Failed FR impact sensor (internal electronics or ID memory corrupted)
  • Poor ground or lost reference voltage to the sensor
  • SRS control unit software or internal fault
  • Recent collision repair or aftermarket work with incorrect sensor replacement or connector mismatch

Symptoms

  • SRS/airbag warning lamp illuminated on instrument cluster
  • Possible companion SRS fault codes stored (related impact sensors or communication)
  • Airbag system self-test reports FR impact sensor ID error
  • Possible disabling of airbag deployment on affected side
  • Intermittent SRS light if wiring is intermittent

What to check

  • Read and record B1582 and any other SRS codes with a diagnostic scan tool that supports Mitsubishi SRS
  • Capture freeze frame / live data to confirm VIN, battery voltage and time of fault
  • Visually inspect the FR impact sensor, mounting, and connector for corrosion, damage or water ingress
  • Check wiring harness for chafing, pinched sections or signs of recent repairs/collision work
  • With ignition ON (engine off) check for proper reference voltage at the sensor connector (see vehicle service manual for spec)
  • Verify good ground at sensor and continuity between sensor ground and SRS ECU ground

Signal parameters

  • Sensor supply/reference voltage — typically ~5 V (verify factory spec) present with ignition ON
  • Sensor ground — low resistance to chassis ground
  • Signal/communication line — presence of data or expected voltage level (may be digital or analog depending on sensor design)
  • Sensor ID value reported via scan tool — should match factory expected ID or be readable
  • No short to battery voltage or ground on signal/ID line, and no intermittent open circuits

Diagnostic algorithm

  1. Safety: Follow Mitsubishi SRS safety procedures. Disable battery negative terminal and wait the manufacturer-specified time before touching SRS components. Use anti-static precautions and store pyrotechnic devices correctly.
  2. Read codes with a capable scan tool and record all SRS-related codes and freeze frame data. Note if other impact sensors report problems.
  3. Visually inspect the FR impact sensor, mount and connector for water, corrosion, damage or loose pins. Check harness routing for pinch or recent repair evidence.
  4. Reconnect battery (if disconnected for initial inspection) and with ignition ON (engine off) measure reference voltage, signal voltage and ground at the sensor connector per factory specifications. Look for correct supply and a valid signal/ID.
  5. Check continuity between the sensor connector and SRS ECU connector for signal, supply and ground circuits. Repair any open circuits or high resistance.
  6. Inspect for shorts to battery or ground on the sensor's wiring. Repair as needed.
  7. Using the scan tool, attempt to read the FR impact sensor ID or live data. If the ID is unreadable or incorrect after wiring checks, consider replacing the sensor.
  8. If sensor replacement is required, install a known-good OEM sensor (do not interchange non-compatible sensors). Perform any required sensor registration or SRS ECU initialization per service manual.
  9. Clear codes and perform SRS system self-check. Verify the SRS lamp extinguishes and no B1582 returns. Road-test only after confirming system OK.
  10. If code persists after replacing sensor and confirming wiring, consult manufacturer service information for SRS ECU diagnostics or consider ECU replacement/programming as a last step.

Likely causes

  • Damaged connector terminals at the FR impact sensor (most likely)
  • Wiring harness abrasion or chafing causing intermittent contact
  • Failed sensor electronics (ID not transmitted or wrong ID)
  • Short to power or ground on the sensor signal/communication line
  • SRS ECU fault or need for sensor registration after replacement (less common)

Fault status

⚠️ Status
FR impact sensor ID fault — SRS control unit reports the front-right impact sensor identification is missing, invalid or not communicating. SRS lamp will be ON until fault cleared and proper sensor ID/signal restored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1580 B1581 B1583 B1590 B1620
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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