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Home / DTC / B1586 — RR side impact sensor ID fault

B1586 — RR side impact sensor ID fault

Detailed page for trouble code B1586.

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B1586

MITSUBISHI B — Body

RR side impact sensor ID fault

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

Causes

  • Open, shorted, or intermittent wiring between rear right impact sensor and SRS ECU
  • Corroded, bent or loose sensor connector or terminal
  • Water intrusion or physical damage to the sensor
  • Failed rear right side impact sensor (internal electronics)
  • Incorrect or mismatched replacement sensor installed (wrong ID)
  • Faulty SRS control module or corrupted ID table/software

Symptoms

  • SRS / airbag warning lamp illuminated on instrument cluster
  • Possible disablement of rear right side airbag or related restraint functions
  • Diagnostic trouble code B1586 present in SRS control unit
  • No other driveability symptoms (vehicle usually runs normally)

What to check

  • Use an OEM-quality diagnostic tool (MUT-III or equivalent) to read and record all SRS codes and freeze-frame data
  • Check for other related SRS codes that may indicate wiring or module faults
  • Visually inspect rear right sensor, mounting, and wiring harness for damage, corrosion, or water ingress
  • Inspect and reseat the sensor connector; check for bent pins and corrosion
  • Check connector continuity and resistance between sensor and SRS ECU pins (refer to wiring diagram)
  • Verify supply/reference voltages and CAN/bus communications using the factory diagnostic procedure

Signal parameters

  • SRS module supply voltage: battery voltage present at sensor power feed (measure with ignition ON) — verify against vehicle spec
  • Sensor reference or signal line: expected manufacturer-specific reference voltage (often a 5 V reference or coded ID voltage) — check with factory data
  • Sensor ID/resistance: sensor ID may be encoded as a specific resistance or digital ID value — compare reading to service values
  • CAN/serial comms: SRS ECU should report sensor presence/ID via diagnostic tool; check for valid messages and no bus errors
  • Continuity: low resistance between sensor connector and SRS ECU ground/signal pins (no opens or high resistance)

Diagnostic algorithm

  1. Safety first: follow factory SRS safety procedures. Disable battery negative terminal and wait the recommended time (usually 2–3 minutes or manufacturer-specified delay) before touching airbag connectors.
  2. Connect an OEM-capable diagnostic tool. Read and record all SRS codes and freeze-frame data. Note any additional codes.
  3. Clear the code and perform an ignition cycle to see if B1586 returns (helps identify intermittent faults).
  4. Perform a careful visual inspection of the rear right impact sensor, its connector, and the wiring harness (look for corrosion, water, rodent damage, chafing, or kinks).
  5. With battery reconnected and following safety rules for powered checks, verify reference and supply voltages at the sensor connector with the diagnostic tool or meter — compare to factory spec.
  6. Check continuity and resistance between the sensor connector and the SRS ECU connector pins using wiring diagrams to confirm no opens/shorts. Wiggle the harness to try to reproduce intermittent faults.
  7. If available, swap the rear right sensor with the corresponding (known-good) left-side sensor or a known-good sensor of the same part number to see if the ID fault follows the sensor (only swap identical sensors and follow safety rules).
  8. If the sensor swap corrects the code, replace the faulty sensor. If the fault remains, inspect/repair wiring or connectors, then re-test.
  9. If wiring and sensor check good but code persists, check SRS ECU programming and ID tables; perform ECU re-flash or module replacement only after confirming wiring and sensor condition.
  10. After any repair, clear codes with the diagnostic tool, perform SRS system self-tests, and confirm the SRS warning lamp extinguishes and code does not return.
  11. Document repairs and verify system operation. If unsure at any point, escalate to dealer/service center with SRS expertise.

Likely causes

  • Poor connector contact or corrosion at rear right impact sensor
  • Broken, chafed or intermittent wiring harness to sensor
  • Failed/defective impact sensor
  • Incorrect sensor fitted or sensor ID not programmed

Fault status

⚠️ Status
Rear right side impact sensor ID circuit fault — SRS ECU does not recognize the sensor ID or detects an invalid/missing ID. SRS warning lamp may be on and related restraint functions may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

B1580 B1581 B1582 B1583 B1584 B1585
406

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