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Home / DTC / B2931 — Down latch LH open:short to BAT

B2931 — Down latch LH open:short to BAT

Detailed page for trouble code B2931.

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Code

B2931

MITSUBISHI B — Body

Down latch LH open:short to BAT

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

Causes

  • Damaged/chafed wiring harness contacting battery/constant power
  • Corroded or poorly seated connector at LH down latch switch
  • Faulty LH down latch switch with internal short
  • Aftermarket accessory wired into latch circuit
  • Faulty BCM or connector (less common)

Symptoms

  • DTC B2931 stored in BCM
  • Left-side latch does not operate correctly (may be seen as not locking/unlocking or not detecting closed position)
  • Interior warning message or indicator about latch/door status
  • Intermittent operation that changes with door/hood/seat movement or wiring position

What to check

  • Retrieve freeze-frame/related codes and note conditions when fault set
  • Visual inspection of LH latch wiring, harness along its routing, and connectors for damage or corrosion
  • Backprobe the latch connector and measure voltage with connector connected and key on
  • Wiggle harness and operate latch while watching live data or voltages to reproduce fault
  • Disconnect LH latch connector and see if code clears or if the shorted voltage is removed at the harness side
  • Inspect for aftermarket devices or recent repairs splicing into latch circuits

Signal parameters

  • Expected: signal line should be low (near 0 V) or open when latch not powered; switch should pull to ground when activated (manufacturers vary)
  • Fault condition: signal line measures battery voltage (~12 V) when it should not (indicates short to B+)
  • During operation: voltage should change predictably when switch toggled; permanent ~12 V indicates short to B+

Diagnostic algorithm

  1. Connect a scan tool, confirm B2931 is active or in history, note freeze-frame data and ignition/door status when set.
  2. Visually inspect LH down latch, connector, and wiring routing for obvious damage, pinch points, or aftermarket splices.
  3. Backprobe the latch connector with harness connected. With ignition ON, measure voltage on the signal pin. If ~12 V present when it should be low, short to B+ is present.
  4. Disconnect the latch connector. Re-check voltage at the harness side. If voltage goes away, fault is in latch or connector; if still present, fault is upstream in harness or BCM.
  5. If harness side is OK when disconnected, bench-test or substitute a known-good latch/switch to verify behavior. Replace latch if defective.
  6. If harness still shows battery voltage with latch disconnected, trace wiring toward fuse/relay/BCM. Look for chafed insulation contacting power feed or incorrect splices.
  7. Repair damaged wiring or connectors (replace sections or terminals as needed), secure harness routing, then clear codes and retest for reoccurrence.
  8. If wiring and latch check good and fault persists, test/inspect BCM connector pins for short and consider BCM diagnosis or replacement per service manual.

Likely causes

  • Wiring abrasion near hinge or door/seat pivot causing insulation break and contact with battery feed
  • Connector pins bent, corroded, or pushed into housing causing short to B+
  • Latch switch failed internally and is passing battery voltage to the signal line
  • Previous repair or harness splice incorrectly tied to battery power

Fault status

⚠️ Status
Left-hand down latch open circuit: detected short to battery (unexpected battery voltage on latch signal). Inspect latch, connector, and wiring for short to B+ before replacing control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B2930 B2932 B2941 B2750 B2600
406

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