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Home / DTC / B0053 — second row, left seat belt sensor

B0053 — second row, left seat belt sensor

Detailed page for trouble code B0053.

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Code

B0053

LAND ROVER B — Body

second row, left seat belt sensor

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

Causes

  • Open or short in the seat belt sensor wiring (second row, left)
  • Corroded, damaged or loose connector at the seat belt buckle or module
  • Faulty seat belt buckle switch or occupant detection sensor
  • Water intrusion or contamination in the seat connector or harness
  • Fault or software issue in the body/control module reading the sensor
  • Previous repair with improperly routed or pinched wiring

Symptoms

  • Seat belt warning lamp or chime for the second-row left seat
  • Airbag/occupant sensing lamp or warning message (depending on model)
  • Failure to register occupant/belted state for the second-row left seat
  • DTC B0053 stored in the vehicle control module
  • Possible intermittent warning or sensor behavior when seating position changes

What to check

  • Read and record freeze-frame and full DTC list with a compatible scan tool
  • Visually inspect the second-row left seat belt buckle, connector and harness for damage, corrosion or moisture
  • Perform wiggle test of wiring and connector while monitoring the live sensor data
  • Verify connector is fully seated and pins are not pushed out or bent
  • Check for related SRS/BCM codes that could indicate wider system issues
  • Compare live sensor state (buckled/unbuckled) with scan tool readings

Signal parameters

  • Buckle switch state typically changes between open circuit and closed circuit (continuity) when buckled/unbuckled
  • Some systems use a switched 12 V or a low-voltage (0–5 V) signal — expected stable change when buckling
  • Intermittent or fluctuating voltage/continuity indicates wiring or connector issue
  • Resistance reading: open (infinite) when unbuckled vs near 0 Ω when firmly buckled on simple switch designs (refer to service manual for exact values)

Diagnostic algorithm

  1. Retrieve and record B0053 plus any additional stored codes and freeze-frame data with a compatible scan tool.
  2. Confirm which physical component and connector correspond to the second-row left seat belt sensor using the vehicle wiring diagram or service manual.
  3. Visually inspect the buckle, harness, and connector for damage, corrosion, water ingress or loose pins. Repair any obvious damage.
  4. With connector disconnected, check for proper reference power and ground at the harness plug (refer to vehicle manual for pinout and expected voltages).
  5. Measure continuity/resistance of the buckle switch while actuating the latch; verify it changes state. If the switch is simple open/closed, expect continuity when buckled (consult manual for exact behavior).
  6. If wiring or connector issues are suspected, perform a backprobe or continuity check from the buckle plug to the body/control module connector. Repair any shorts or opens.
  7. If wiring and connector are good but the buckle switch does not operate correctly, replace the seat belt buckle/sensor assembly.
  8. After repairs, clear DTCs and confirm sensor operation via scan tool and in-vehicle checks (chime/indicator). Perform a short road test or occupant simulation to ensure the fault does not return.
  9. If the fault persists after component replacement, verify module programming and operation; consider module diagnostics or dealer-level software updates.

Likely causes

  • Damaged or corroded connector at the second-row left buckle
  • Broken wire in the harness between the buckle and body control module
  • Failed buckle switch (mechanical or electrical)
  • Water ingress into the seat harness or connector

Fault status

⚠️ Status
Second row left seat belt sensor circuit fault — open/short/intermittent or invalid signal detected. Service required to inspect buckle, wiring and connector.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B0050 B0051 B0052 B0054 B0055
413

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