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Home / DTC / B1508 — DR.seat position SW short to BAT

B1508 — DR.seat position SW short to BAT

Detailed page for trouble code B1508.

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Code

B1508

MITSUBISHI B — Body

DR.seat position SW short to BAT

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

Causes

  • Damaged wiring or insulation allowing the switch signal wire to contact a constant 12 V source
  • Corroded or bent terminal in connector causing unintended connection to battery voltage
  • Faulty driver seat position switch (internal short)
  • Faulty seat control module or ECU input driver
  • Incorrect or damaged aftermarket wiring (e.g., alarms, audio) near seat harness
  • Moisture intrusion in connector or harness

Symptoms

  • Seat position, memory or power seat functions inoperative or erratic
  • Related warning lamp illuminated (seat/airbag/seatbelt system) depending on vehicle
  • DTC B1508 stored; possible intermittent behavior when seat is moved
  • Possible inability to save or recall seat memory positions

What to check

  • Read and record freeze frame and MIL status; note other stored codes
  • Visual inspection of seat wiring harness, connectors and routing through seat rails and floor grommet
  • Check connector pins for corrosion, damage or bent pins at seat switch and seat control module
  • Measure voltage at the seat position switch connector with ignition ON (key ON) and while operating the switch
  • Wiggle test harness while monitoring voltage or DTC status to reproduce the fault
  • Inspect for aftermarket devices or splices near seat wiring

Signal parameters

  • Normal: seat position switch signal should toggle between ~0 V (or low reference) and a switched voltage per manufacturer spec when operated
  • Fault: signal stuck near battery voltage (~12 V) or higher than expected threshold
  • Expected circuit resistance: continuity from switch terminal to seat control module pin; not shorted to B+
  • No-load short: infinite/very high resistance to ground and low resistance to battery indicates short to B+

Diagnostic algorithm

  1. Connect a diagnostic scanner, confirm B1508 and note any other related B‑codes. Record freeze frame data.
  2. Perform visual inspection of seat harness, connectors and routing. Pay special attention to areas where harness contacts metal or passes through grommets.
  3. With connector disconnected, measure voltage between the suspect signal pin and ground with ignition ON. If battery voltage present with switch in all positions, a short to B+ or module fault is likely.
  4. Disconnect the seat position switch connector and measure continuity between the switch signal wire and battery positive. If continuity exists with connector disconnected, locate and repair wiring short.
  5. Reconnect switch and operate it while probing the signal pin. Verify the signal changes as expected; if it stays at B+, inspect switch for internal short and replace if necessary.
  6. If wiring and switch test OK, check the seat control module input pin for short to B+. Remove power and inspect connector; if module input is shorted internally, replace module.
  7. After repairs, clear codes, cycle ignition and operate seat to confirm B1508 does not return. Perform a final scan for additional stored codes and road/test as required.
  8. Safety note: Follow vehicle manufacturer SRS and battery disconnect procedures before extensive work around seats or airbag components.

Likely causes

  • Chafed harness where it passes through the seat frame or under the carpet contacting a 12 V feed
  • Loose/bent pin in the seat position switch connector shorted to a 12 V pin
  • Failed seat position switch with internal short to battery
  • Connector corrosion at seat control module

Fault status

⚠️ Status
B1508 — Driver seat position switch circuit short to battery. Signal line reading battery voltage when it should vary with switch operation; fault stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1500 B1501 B1502 B1509 B1510
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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