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Home / DTC / B29D9 — Rear center latch:close timeout

B29D9 — Rear center latch:close timeout

Detailed page for trouble code B29D9.

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22,461specific
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Code

B29D9

MITSUBISHI B — Body

Rear center latch:close timeout

Brand: MITSUBISHI
Type: B — Body
Views: UK: 17 EN: 23 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Obstruction or foreign object preventing latch from fully engaging
  • Mechanical wear, corrosion or binding in latch/striker
  • Faulty latch actuator (motor/solenoid)
  • Failed or misadjusted latch position switch/micro switch
  • Low battery or inadequate supply voltage during closure
  • Damaged wiring, poor connector or open/short to latch circuit

Symptoms

  • Tailgate/trunk will not fully close or lock
  • Trunk/tailgate ‘ajar’ or warning lamp/message illuminated
  • Repeated beeps or audible warnings when attempting to close
  • Power tailgate stops before latch engagement
  • DTC B29D9 stored in body control module or diagnostic tool
  • Intermittent operation of central locking for rear center latch

What to check

  • Scan and record DTCs and live data (BCM, tailgate module)
  • Attempt commanded close from scan tool while monitoring latch status and supply voltage
  • Visually inspect latch, striker and surrounding area for obstructions, damage or corrosion
  • Check battery voltage and charging system under load (during closure)
  • Inspect fuses and relays related to tailgate/locking circuits
  • Inspect wiring harness and connector at latch for corrosion, broken wires or poor contact

Signal parameters

  • LATCH_CLOSE_COMMAND (ON/OFF) from BCM
  • LATCH_POSITION_SWITCH (OPEN/CLOSED) state and transition time
  • Actuator supply voltage during close command (volts)
  • Actuator current draw during operation (amps)
  • Time from close command to reported closed state (ms or seconds)
  • Door ajar / tailgate ajar status message on CAN bus

Diagnostic algorithm

  1. Connect OBD-II scan tool and read all stored DTCs; note freeze-frame and any related codes.
  2. Check battery voltage and ensure adequate charge (recommended ≥12.4 V at rest, ≥11–12 V under load).
  3. Visually inspect tailgate latch, striker and surrounding area; remove any obstruction and check for deformation or corrosion.
  4. With scan tool, command the rear center latch to close and observe live data: latch command, latch position switch state, supply voltage and actuator current. Note timeout behavior.
  5. If actuator does not respond, probe for supply voltage at the latch connector during a commanded close. If no voltage, trace wiring, fuses and relay back to BCM.
  6. If voltage is present but latch does not move, measure actuator current. High current may indicate mechanical binding; zero or low current may indicate open circuit or failed actuator.
  7. Inspect and test latch position switch continuity and switching action manually. Replace switch if it never changes state when latch is physically closed.
  8. Check connector pins for corrosion, bent pins, or poor contact; repair or replace connector as needed and recheck operation.
  9. Free the latch and lubricate pivot points; correct striker alignment if misaligned and adjust as required to achieve smooth engagement.
  10. If actuator or latch mechanism is confirmed faulty, replace the latch/actuator assembly. Reconnect, clear DTCs and verify repeated successful closures under scan-tool monitoring.
  11. If wiring and latch are good but fault persists, check BCM software/firmware level and update if a known issue exists, or investigate BCM for internal fault or CAN communication errors.

Likely causes

  • Mechanical obstruction or misalignment preventing the latch from seating
  • Failed latch actuator or excessive current draw in actuator
  • Faulty latch position switch (sensor) not reporting closed state
  • Damaged wiring or poor connector at latch harness
  • Low battery/insufficient voltage during operation

Fault status

⚠️ Status
Rear center latch failed to close within expected time (close timeout).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B29D8 B29D0 B29D1 B2900 B29DA
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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