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Home / DTC / B1459 — RL side impact sensor No COM.

B1459 — RL side impact sensor No COM.

Detailed page for trouble code B1459.

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Code

B1459

MITSUBISHI B — Body

RL side impact sensor No COM.

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

Causes

  • Open or shorted wiring between RL side impact sensor and airbag ECU
  • Corroded, loose, or disconnected sensor connector or pins
  • Faulty RL side impact sensor (internal failure)
  • Faulty airbag/occupant restraint control module or internal comm fault
  • Blown SRS fuse, poor ground, or low battery/voltage supply to sensor circuit
  • Previous repairs or body damage that damaged the harness

Symptoms

  • SRS / airbag warning lamp illuminated on instrument panel
  • Diagnostic trouble code B1459 stored in SRS module
  • Possible disabling of rear-left side airbag or seatbelt pretensioner
  • No obvious drivability symptoms (electrical/communication issue)
  • Intermittent warning lamp if connection is intermittent

What to check

  • Read and record all SRS codes and freeze-frame data with a capable scan tool
  • Visual inspection of RL side impact sensor connector, wiring, and mounting area for damage, corrosion, or water
  • Check SRS system fuses and ground points related to the sensor circuit
  • Wiggle test harness and connector while monitoring fault status or live data
  • Measure supply voltage and ground at the sensor connector with ignition ON
  • Check communication bus status (SRS/CAN) and ensure bus is intact to the sensor and ECU

Signal parameters

  • Battery supply at sensor connector: ~12 V with ignition ON (verify exact value)
  • Ground at sensor connector: near 0 V (low resistance to chassis ground)
  • Reference/sensor signal: typically a low-voltage logic signal or CAN/SRS bus — refer to factory wiring diagram for exact levels
  • CAN bus idle voltages (if used by system): approximately 2.5 V nominal on CAN-H and CAN-L (verify with scope)
  • Sensor continuity: low ohms between sensor ground and chassis ground; no short to battery or signal circuits

Diagnostic algorithm

  1. Connect a Mitsubishi-capable SRS scan tool. Read and save codes and live data. Note if other SRS codes are present.
  2. Clear codes, then attempt to re-create the fault. Note whether B1459 returns immediately or intermittently.
  3. Visually inspect the RL side impact sensor and connector for physical damage, corrosion, water intrusion, or loose mounting.
  4. With ignition OFF, disconnect the RL sensor connector and inspect pins for corrosion, bent pins, or pushed-out terminals.
  5. With ignition ON (and battery stable), check for proper supply voltage and ground at the sensor harness connector. Compare to vehicle spec.
  6. Check communication lines with a multimeter or oscilloscope at the sensor connector. Verify bus activity and nominal voltages per factory data.
  7. Perform continuity checks from the sensor connector to the SRS ECU for power, ground, and communication lines; look for opens/shorts.
  8. Wiggle the harness and connector while monitoring live data / DTCs to locate intermittent faults.
  9. If wiring and connectors test good, replace the RL side impact sensor with a known-good unit or new OEM sensor, then re-scan and clear codes.
  10. If the fault remains after sensor replacement, inspect/repair wiring back to the SRS ECU. Consider replacing or reprogramming the airbag control module only after wiring and sensor are verified good.
  11. After repair, clear codes and perform full SRS system check to confirm no remaining faults and that the SRS lamp extinguishes.

Likely causes

  • Damaged/disconnected sensor connector at rear-left wheelwell/seat anchor
  • Open/short in communication or power/ground wires between sensor and SRS ECU
  • Failed RL side impact sensor
  • Corroded pins or water-damaged harness in the rear quarter area
  • Fault in the vehicle SRS module or module programming/firmware issue

Fault status

⚠️ Status
Communication fault — Rear-Left side impact sensor not communicating with the airbag/occupant restraint control module. SRS warning lamp active; related side-impact protection may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1458 B1460 B1500 B1121 B1420
406

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