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Home / DTC / B1532 — PS.buckle SW SHT.to GND for N.C

B1532 — PS.buckle SW SHT.to GND for N.C

Detailed page for trouble code B1532.

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Code

B1532

MITSUBISHI B — Body

PS.buckle SW SHT.to GND for N.C

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

Causes

  • Damaged or chafed wiring shorting to chassis ground under the passenger seat
  • Corroded, loose or damaged connector at the buckle switch or SRS harness
  • Faulty passenger seat belt buckle switch (internal short)
  • Water intrusion or contamination in connector or switch
  • Poor repair or pinched harness after seat removal
  • Faulty SRS/airbag control module (less common)

Symptoms

  • SRS/airbag warning light illuminated on dash
  • Passenger seat belt indicator (on dash or seat) behaves incorrectly or does not change state when buckle is fastened/unfastened
  • Possible disablement of passenger airbag or pretensioner depending on system logic
  • Diagnostic trouble code B1532 stored in SRS/airbag module

What to check

  • Scan SRS/airbag module and record stored codes and freeze frame data
  • Visually inspect passenger seat area for damaged wiring, pinched harness, or connector contamination (especially under the seat and along seat tracks)
  • Check connector retention and terminal condition at the buckle switch and at the seat harness junctions
  • Perform a wiggle test while monitoring the buckle input with a scan tool or multimeter to see if movement changes the status or clears the fault
  • Verify proper connector mating and that locking tangs are intact and pins are not spread or backed out

Signal parameters

  • Expected: buckle switch closed = near 0 Ω between switch terminal and ground (if switch is simple NO/NC to ground)
  • Expected: buckle switch open = high resistance / open circuit (OL) between terminals
  • With key ON and system powered: buckle OPEN typically reads a pulled-up voltage (varies by model — commonly 5 V or approx. ignition voltage through internal resistor); buckle CLOSED reads ~0 V (ground) if the switch grounds the circuit
  • Typical switch resistance when closed: 1 MΩ or OL (consult model-specific manual)
  • Note: exact voltages/resistors vary by model—refer to the Mitsubishi wiring diagram and SRS specifications for precise values.

Diagnostic algorithm

  1. Read and record B1532 and any related SRS codes with an OEM-level scan tool. Note freeze frame and vehicle state when code set.
  2. Visually inspect connectors and wiring at passenger buckle, under-seat junctions, driver/passenger seat rails, and towards the SRS control module for damage, corrosion, or water intrusion.
  3. With ignition OFF, disconnect the passenger buckle switch connector and inspect terminals for corrosion, bent pins, or contamination. Repair or replace any damaged terminals.
  4. Using a multimeter set to resistance, measure across the buckle switch terminals (remove switch from harness if needed): expected closed resistance near 0 Ω when actuated, open should be OL. If readings are incorrect, replace the buckle switch.
  5. With ignition ON (battery connected), back-probe the buckle signal wire at the harness and observe voltage with buckle buckled vs unbuckled (use appropriate scan tool/data stream if available). Compare to expected values from service information.
  6. If the harness shows a short to ground (signal at or near 0 V regardless of switch state), isolate by disconnecting sections of the harness (unplug connectors) and re-check the signal to locate the short location.
  7. Perform a wiggle test of the seat wiring while monitoring the sensor/signal to reproduce the fault. Pay attention to wiring routed through seat rails and under the seat where chafing is common.
  8. Repair any damaged wiring or connectors: repair splices with proper crimp/solder and heat-shrink or replace the harness/connector as required. Replace the buckle switch if internally shorted or damaged.
  9. After repairs, clear codes and perform a functional test: buckle/unbuckle several times, perform SRS system checks with scan tool, and verify no recurrence of B1532 and proper passenger airbag/indicator behavior.
  10. If wiring and switch test good but code persists, consult wiring diagrams and consider SRS control module input circuit testing or replacement per factory procedures. Always follow SRS safety precautions when working near airbag components.

Likely causes

  • Wiring short to ground at or near the passenger seat harness (most common)
  • Failed seat belt buckle switch
  • Corroded/contaminated connector causing low resistance to ground

Fault status

⚠️ Status
The SRS module detected that the passenger seat belt buckle switch circuit is shorted to ground (unexpected low/grounded signal). The module set DTC B1532 to indicate this wiring or component fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B1530 B1531 B1533 B1570 B1620
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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