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Home / DTC / B1596 — FR impact sensor open

B1596 — FR impact sensor open

Detailed page for trouble code B1596.

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B1596

MITSUBISHI B — Body

FR impact sensor open

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

Causes

  • Open or broken wiring between FR impact sensor and SRS ECU
  • Corroded, loose, or damaged connector at the FR impact sensor
  • Failed FR impact sensor (internal open)
  • Poor ground or power supply to the sensor circuit
  • Water intrusion or physical damage (collision repair, seat removal)
  • Faulty SRS control module or internal module connector fault

Symptoms

  • SRS/Airbag warning lamp illuminated on dash
  • Possible supplemental restraint system disabled — airbags/pretensioners may be inhibited
  • Fault stored in SRS module (may prevent vehicle from passing safety inspection)
  • Related SRS codes may be present

What to check

  • Read SRS module memory with a capable scan tool; note freeze frame and related codes
  • Visual inspection of FR impact sensor, connector, and harness for damage, corrosion, or moisture
  • Wiggle test connectors and wiring while monitoring for changes in stored codes or live data
  • Verify vehicle battery voltage and SRS ECU power/ground circuits
  • Measure continuity/resistance of the sensor circuit to the SRS ECU (compare to service manual)
  • Inspect for recent body repairs or seat removal that could have disturbed wiring

Signal parameters

  • Circuit condition expected: continuity between sensor pins and SRS ECU (no open circuit)
  • Fault indicates an open circuit (infinite or very high resistance) on the FR impact sensor wiring or within the sensor
  • Some systems use a low-voltage sensor output or switch; consult manufacturer data for exact resistance/voltages

Diagnostic algorithm

  1. Retrieve and record all SRS codes and freeze-frame data using a suitable scan tool. Check for related codes (other impact sensors, ECU faults).
  2. Disconnect negative battery terminal and wait per vehicle procedures to disable SRS before handling connectors or removing trim.
  3. Perform a visual inspection of the FR impact sensor, mounting area, connector and wiring harness for damage, corrosion, moisture, or loose pins.
  4. Reconnect battery and back-probe the sensor connector; measure continuity between the sensor pin(s) and the SRS ECU connector. Confirm presence of proper reference power/ground per factory procedures.
  5. If open circuit is confirmed, trace wiring from sensor to ECU, repairing broken wires, pins, or corroded connectors. Repair using solder/crimp and heat-shrink or OEM-style terminals as required.
  6. If wiring and connector are good, replace the FR impact sensor with a known-good/new unit following manufacturer replacement and calibration procedures.
  7. After repair or replacement, clear SRS codes, perform the SRS self-check with the scan tool, and verify the warning lamp extinguishes and no new codes return.
  8. If fault persists, inspect SRS ECU connectors and grounds; consider ECU fault and consult manufacturer diagnostic procedures or dealer-level support.

Likely causes

  • Damaged or disconnected connector at the FR impact sensor (most common)
  • Broken wire due to chafing or seat/trim removal
  • Failed impact sensor hardware

Fault status

⚠️ Status
Front‑right impact sensor circuit open (SRS). The airbag control module reports loss of sensor circuit continuity; SRS warning lamp set. System may inhibit airbag deployment until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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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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