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Home / DTC / B1307 — TN latch close sensor:L=ON/R=OFF

B1307 — TN latch close sensor:L=ON/R=OFF

Detailed page for trouble code B1307.

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Code

B1307

MITSUBISHI B — Body

TN latch close sensor:L=ON/R=OFF

Brand: MITSUBISHI
Type: B — Body
Views: UK: 17 EN: 27 RU: 19
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Page language: EN

Causes

  • Failed TN (trunk/tailgate) latch close sensor/switch
  • Damaged, corroded or loose connector at the latch sensor
  • Open, shorted, or intermittent wiring between latch sensor and body control module (BCM)
  • Latch mechanical fault (sensor not actuated when latch is closed)
  • Faulty BCM or input circuit fault in body electronics
  • Water intrusion or contamination at latch assembly

Symptoms

  • Trunk/tailgate open/closed warning lamp or message
  • Central locking may not lock/unlock trunk properly
  • Interior light or baggage compartment lamp stays on
  • DTC B1307 stored; possible related convenience function failures
  • Intermittent trunk latch operation

What to check

  • Read freeze frame and live data with a scan tool to confirm sensor states and whether fault is current or intermittent
  • Visually inspect latch assemblies, sensors, and connectors for damage, corrosion, or water intrusion
  • Operate the latch manually while watching live data to see if sensor state changes
  • Check fuses and grounds related to body control/trunk circuits
  • Wiggle test wiring harness while observing live data for intermittent changes

Signal parameters

  • Expected: latch-close sensor is a binary switch — closed (actuated) vs open (not actuated)
  • Typical electrical behavior: actuated (ON) shows continuity to ground or a low-voltage signal; not actuated (OFF) shows open circuit or pulled to battery voltage via pull-up. Exact voltages depend on vehicle; consult service manual
  • Resistance when closed: near 0 ohms between sensor terminal and ground (if switch-to-ground type)
  • When testing with scan tool: sensor bit should toggle between ON and OFF as latch is moved

Diagnostic algorithm

  1. Connect a qualified scan tool, confirm B1307 and record sensor state data. Attempt to reproduce fault by operating trunk latch.
  2. Visually inspect latch area(s) and connector(s). Look for corrosion, damage, deformation or water ingress.
  3. With ignition ON (or as required by service manual), monitor live data while manually actuating latch. Confirm left/right sensor states change correctly.
  4. Probe the sensor connector at the harness side: check for expected voltage/ground and for continuity to the BCM pin. Back-probe connector — do not damage terminals.
  5. If sensor does not change state but wiring has proper voltage/ground, remove and bench-test or replace the sensor/switch.
  6. If wiring is open/intermittent, repair broken wires, replace damaged connectors, and secure harness to prevent chafing.
  7. After repairs, clear codes and retest several open/close cycles to confirm fault does not return.
  8. If wiring and sensor test good but fault persists, inspect BCM input circuit and consider module testing/replacement per factory procedure.

Likely causes

  • Defective latch close sensor (left or right)
  • Corroded/loose connector at latch
  • Open/intermittent wiring between sensor and BCM
  • Latch misalignment or mechanical sticking preventing sensor actuation

Fault status

⚠️ Status
TN latch close sensor: Left = ON, Right = OFF — indicates disagreement between left and right latch-close sensor signals or a failure in the latch detection circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1300 B1301 B1302 B1308 B1310
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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