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Home / DTC / B1506 — DR.seat position SW open

B1506 — DR.seat position SW open

Detailed page for trouble code B1506.

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Code

B1506

MITSUBISHI B — Body

DR.seat position SW open

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

Causes

  • Open or broken wiring in the driver seat position switch circuit
  • Disconnected, loose, corroded or damaged connector at the seat position switch or seat control module
  • Faulty driver seat position switch (internal contact failure)
  • Faulty seat control module (less common)
  • Aftermarket accessories, seat removal or previous repairs that disturbed wiring harness

Symptoms

  • Stored B1506 DTC and possibly related seat-position or memory warnings on instrument cluster
  • Seat memory or automatic seat position functions do not operate
  • Seat position indicator shows incorrect or no reading
  • Intermittent operation of seat position detection (works sometimes)
  • Possible inability to save or recall driver seat presets

What to check

  • Use a scan tool to confirm B1506 and check freeze-frame / live data for seat position switch status
  • Visually inspect the seat underside and wiring harness for damage, chafing, or loose connectors
  • Check connector pins for corrosion, bent pins, or pushed-out terminals at the switch and seat control module
  • Wiggle test harness and switch while watching live data to reproduce the fault
  • Measure continuity and resistance of the switch circuit between the switch connector and the seat control module connector
  • Measure supply voltage and ground presence at the switch (refer to service manual for pin locations)

Signal parameters

  • Open circuit (OL) on continuity check between switch terminal and module when switch should be closed
  • Closed switch: low resistance near 0–few ohms (manufacturer-specific)
  • Voltage-based switches: key-on expected reference voltage (e.g., 5 V or 12 V depending on design) at the switch signal terminal — open = 0 V or floating
  • Live-data: position switch should change state when seat is moved; open = no change

Diagnostic algorithm

  1. Read and record DTC(s) and freeze-frame data with a proper diagnostic scanner. Clear codes and re-obtain to confirm persistence.
  2. Visually inspect driver seat area: connectors, harness routing, seat rails, and any signs of damage or aftermarket modifications.
  3. With ignition on, observe live-data for the seat position switch while moving the seat; perform a wiggle test on the harness and connector to see if fault reappears.
  4. Disconnect battery or follow vehicle-specific safety procedures if instructed by the service manual before removing the seat or working near SRS components.
  5. Unplug the seat position switch connector and inspect pins for corrosion, bent or pushed-out terminals; repair/clean as necessary.
  6. Using a DVOM, check for proper reference voltage and ground at the switch connector. If voltage/ground missing, trace back to source and repair wiring or fuse.
  7. Perform continuity/resistance check from the switch terminals to the seat control module connector to find open circuits or high-resistance joints.
  8. If wiring and connectors are good, bench-test or replace the seat position switch assembly and recheck operation.
  9. If the new switch does not clear the code, test/replace or reflash the seat control module per manufacturer procedure.
  10. After repair, clear DTCs, verify seat function, and road-test to ensure fault does not return.

Likely causes

  • Damaged wiring harness under the seat (pinch, chafe, broken strand)
  • Connector pushed out or contacts corroded at the switch or seat control unit
  • Failed position switch inside the seat mechanism
  • Poor ground or power supply to the seat switch circuit

Fault status

⚠️ Status
Driver seat position switch circuit open — seat control module is not receiving a valid position signal. Seat position/memory functions may be disabled until fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

B1501 B1507 B1510 B1600 B1602
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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