Code
B29DB
MITSUBISHI
B — Body
Rear center latch:open cycle
Views:
UK: 17
EN: 23
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty rear center latch switch or position sensor
- Stuck, corroded or mechanically damaged latch or striker
- Intermittent or open/shorted wiring or connector to latch
- Failed latch actuator/motor
- Body control module (BCM) software fault or intermittent input
- Water ingress or contamination at latch assembly
Symptoms
- Rear center door/boot/trunk does not latch or locks intermittently
- Door-open warning lamp, message, or chime for rear center
- Central locking/unlocking does not affect rear center latch
- Possible inability to arm anti-theft system or accept remote lock
- Unusual noise from latch when operating (grinding or repeated cycling)
What to check
- Scan BCM for B29DB and related codes; view freeze frame and event counters
- Operate rear center latch while monitoring live data (switch state, actuator command)
- Visually inspect latch, striker, and surrounding seal for damage, dirt, or corrosion
- Check connector at latch for corrosion, bent pins or loose terminals
- Measure supply voltage and ground at latch connector during operation
- Check for water intrusion or foreign objects in latch area
Signal parameters
- Latch switch: binary state (open/closed) or digital logic level reported to BCM
- Actuator command: BCM output (ground or +12 V) when activating latch
- Supply voltage at latch: nominal battery voltage (approx. 12 V) with engine off; must remain stable during cycle
- Actuator current draw: moderate pulse during movement; excessive or no current indicates fault
- Cycle timing: command duration and time from command to switch state change
Diagnostic algorithm
- Retrieve stored DTCs and freeze frame data with a diagnostic scan tool; note conditions when B29DB set.
- Recreate symptom: operate remote/handle to command latch while monitoring live data for switch state and actuator command.
- Inspect latch assembly and striker for mechanical damage, debris, corrosion, or water ingress; clean and lubricate if required.
- With connector disconnected, inspect pins for corrosion or damage; wiggle test harness while watching live data for intermittent changes.
- Measure voltage and ground at the latch connector during operation. Verify the actuator receives the expected command voltage and the switch signal changes state.
- Measure actuator current during operation. Compare to known-good values (if available). Very low or zero current suggests actuator open; very high current suggests binding or short.
- If wiring or connector faults are suspected, perform continuity and resistance checks back to the BCM; repair any wiring damage.
- If actuator and wiring check good but the switch still reports incorrect sequence, replace the latch assembly (including switch/actuator) and retest.
- After repairs, clear codes and cycle the latch multiple times; verify code does not return and that system functions normally. If intermittent, road-test or cycle to confirm.
- If codes persist after mechanical repair and wiring verified, check BCM inputs/outputs for faults and consider BCM software update or replacement per manufacturer guidance.
Likely causes
- Corroded connector or poor pin contact at latch harness
- Worn latch mechanism causing intermittent switch actuation
- Actuator draws abnormal current or fails to complete cycle
- Wire chafing producing intermittent open circuit during movement
Fault status
Status
Rear center latch — detected abnormal open-cycle. Latch did not complete expected closed/open sequence or switch input changed unexpectedly during cycle.
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Repair manuals
Manual library for MITSUBISHI
203
Browse 203 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MITSUBISHI
-
MITSUBISHI: 2024
-
Outlander PHEV
-
MITSUBISHI: 2023
-
Mirage
-
Mirage G4
-
Outlander PHEV
-
MITSUBISHI: 2022
-
MITSUBISHI: 2021
-
MITSUBISHI: 2020
-
Mirage G4
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email