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Home / DTC / B1458 — RL side impact sensor faulty COM

B1458 — RL side impact sensor faulty COM

Detailed page for trouble code B1458.

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Code

B1458

MITSUBISHI B — Body

RL side impact sensor faulty COM

Brand: MITSUBISHI
Type: B — Body
Views: UK: 13 EN: 114 RU: 16
AI status
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Page language: EN

Causes

  • Damaged or disconnected RL side impact sensor connector
  • Corroded or shorted wiring/harness between sensor and SRS control unit
  • Failed RL side impact sensor
  • Faulty SRS (airbag) control module or module connector
  • Poor ground or low/absent power supply to the sensor
  • Intermittent connection due to water intrusion or physical damage

Symptoms

  • SRS/Airbag warning lamp illuminated on instrument panel
  • Possible inability to perform SRS self-check or diagnostic communication errors
  • Side airbag deployment disabled or faulted (warning shows)
  • DTC B1458 stored in SRS control unit freeze frame
  • Intermittent SRS warning if connection is intermittent

What to check

  • Connect an appropriate SRS-capable scan tool and read all stored SRS/airbag codes and freeze-frame data
  • Verify code is current vs. historical; attempt to clear and see if it returns
  • Visually inspect RL side impact sensor connector and wiring for corrosion, damage, or water intrusion
  • Inspect routing of harness from RL sensor to SRS unit for chafing, pinched or broken wires
  • Check mating connector at SRS control module for bent pins or poor contact
  • Check relevant fuses and battery voltage with ignition ON

Signal parameters

  • Power supply: ignition ON, sensor power feed typically present (verify 9–14 V at sensor power terminal per vehicle spec)
  • Ground: continuity from sensor ground to chassis (
  • Signal/communication: digital data / pulse or voltage on comm line — should show activity on SRS/CAN/LIN bus with no dropouts
  • Resistance: if sensor provides passive resistance measurement, compare to manufacturer's specification (consult repair manual)
  • Diagnostic tool: SRS live-data should show RL sensor status (OK, short, open, communication fault)

Diagnostic algorithm

  1. With battery connected, connect SRS-capable scan tool and record codes and live data. Note whether B1458 is current.
  2. Inspect RL side impact sensor connector and harness visually. Repair any corrosion, bent pins, or physical damage.
  3. Clear code and attempt to reproduce. If code returns immediately or intermittently, proceed to electrical checks.
  4. Back-probe sensor connector: verify power and ground are present with ignition ON. Check for correct voltage and good ground continuity.
  5. Monitor communication/signal line with scan tool or oscilloscope to confirm data exchange. Look for noise, dropouts, or constant invalid values.
  6. If wiring and power/ground are good but communication is absent or corrupted, disconnect sensor and check for expected resistance or diagnostic response per factory procedure.
  7. If sensor fails bench/vehicle tests or live data shows invalid values, replace the RL side impact sensor and re-test.
  8. If new sensor does not clear fault, inspect/repair wiring harness to SRS module and check SRS module connector/pins. Consider SRS module fault if wiring and sensor verified good.
  9. After repairs, clear codes, perform SRS system self-test with scan tool, and confirm no return of B1458. Always follow SRS safety procedures when working on the airbag system.

Likely causes

  • Corroded connector at the RL side impact sensor (water ingress)
  • Broken/shorted wires in the door/floor/harness near RL corner
  • Failed sensor after impact or age
  • Loose or pushed-back connector at SRS control module
  • Blown fuse or poor battery/ignition power to SRS circuit (less common)

Fault status

⚠️ Status
Communication fault detected between rear-left side impact sensor and the SRS control unit. DTC B1458 stored and SRS warning lamp likely illuminated; side impact detection may be disabled until fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1457 B1459 B1600 B1610 U0073
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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