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Home / DTC / B1537 — PS.buckle SW OPEN for COM

B1537 — PS.buckle SW OPEN for COM

Detailed page for trouble code B1537.

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Code

B1537

MITSUBISHI B — Body

PS.buckle SW OPEN for COM

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open circuit in passenger buckle switch wiring (broken conductor, pinched wire at seat rail)
  • Disconnected or corroded connector at the buckle switch or seat wiring harness
  • Faulty passenger seat belt buckle switch (mechanical/electrical failure)
  • Poor or missing ground or supply to the buckle switch circuit
  • Faulty SRS/airbag control module or internal input driver
  • Recent seat removal, repair, or aftermarket accessory installation that disturbed wiring

Symptoms

  • SRS/airbag warning lamp illuminated
  • Seat belt warning lamp or chime for passenger may not function correctly
  • Vehicle occupant detection/belt status for passenger incorrect (buckled indicated when not, or vice versa)
  • Possible fault codes stored related to SRS/seat belt buckle

What to check

  • Use an OEM scan tool or code reader to confirm B1537 and view live data/inputs for passenger buckle status
  • Visually inspect seat buckle connector and wiring along seat frame and under carpet for damage or disconnection
  • Perform a wiggle test of the harness and connector while observing live data to see intermittent changes
  • Check for corrosion, bent pins or poor terminal contact at connectors
  • Verify proper fuse(s) and power/ground to the SRS/seat circuits if applicable

Signal parameters

  • Buckle switch closed (buckled): continuity ≈ 0–10 ohms (model-dependent)
  • Buckle switch open (unbuckled): open circuit or >1 MΩ
  • Connector supply voltage with ignition ON: typically battery voltage (~9–14 V) or low-voltage reference depending on vehicle; check factory data
  • Signal/communication line to SRS: either switched ground/voltage or low-voltage logic pulsed by module (0–5 V) depending on system
  • Continuity from buckle connector pin to SRS harness pin: should be present when switch closed and not open > a few ohms

Diagnostic algorithm

  1. Read and record all SRS-related codes and freeze-frame data. Do not deploy airbags or perform repairs on live circuits; follow safety procedures (battery disconnect where required by vehicle service manual).
  2. Visually inspect the passenger buckle assembly, connector and wiring routing. Look for disconnected connectors, corrosion, damaged insulation, or pinched wires at seat rails.
  3. With ignition ON (and driver/passenger safety precautions followed), monitor live data for the passenger buckle input while operating the buckle (plug/unplug or press buckle). Verify behavior corresponds to physical action.
  4. Unplug the buckle connector and inspect terminals for corrosion, bent pins or foreign material. Reconnect securely and re-check code/inputs.
  5. Measure resistance across the buckle switch terminals while actuating the buckle: expect near 0 ohms when closed and open when released. If readings are incorrect, replace or repair the buckle switch.
  6. Check for continuity between the buckle connector and the SRS module connector pin. Repair any open/shorts found in the harness (repair with proper splices or replace harness section).
  7. If wiring and buckle switch test good, verify proper supply/reference voltage and ground at the buckle connector per vehicle specifications.
  8. After repair, clear codes and perform a road/ignition cycle and re-scan to confirm the code does not return. If intermittent, perform extended wiggle testing while monitoring data.
  9. If all wiring and buckle switch checks are good and the fault persists, consider SRS module input fault—follow manufacturer procedures for module testing or replacement.

Likely causes

  • Disconnected or loose connector at the passenger buckle switch
  • Damaged wiring where it passes through the seat or under the carpet (common at seat rails)
  • Failed buckle switch contacts
  • Corroded terminal or poor mating at harness connector
  • Less likely: SRS module input fault

Fault status

⚠️ Status
Passenger seat belt buckle switch circuit: OPEN detected on communication/input to SRS control module; buckle status not being received reliably.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1536 B1538 B1620 B1640 B1780
406

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