Code
B141D
LAND ROVER
B — Body
Left rear - Climate seat - Electric thermal device 2 temperature sensor
Views:
UK: 5
EN: 10
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between sensor and seat control module
- Corroded, loose, or damaged sensor connector or pins
- Failed temperature sensor (thermistor) inside seat pad
- Water ingress or contamination in the seat causing sensor failure
- Seat wiring harness damage from seat movement or previous repair
- Faulty seat climate control module or poor ground/reference voltage
Symptoms
- Driver or passenger sees a climate-seat warning or stored DTC
- Left rear seat heating/cooling not functioning or inconsistent
- Seat temperature reading out of range or erratic in scan tool live data
- Possible reduced comfort for occupant; seat may not heat or cool as expected
What to check
- Use a diagnostic scan tool to read B141D freeze frame and live data for left rear seat temperature sensor 2
- Visually inspect left rear seat upholstery, connectors, and harness for damage, corrosion or water ingress
- Check connector engagement and look for bent/filled pins at sensor and seat control module
- Perform wiggle test of seat harness while monitoring live data for intermittent changes
- Measure continuity between the sensor connector and seat control module pins (refer to wiring diagram)
- Measure sensor resistance or voltage at the harness connector with connector disconnected from module (compare to expected range)
Signal parameters
- Thermistor-type sensor: resistance varies with temperature (NTC/ PTC) — resistance will change noticeably with hand/heat applied (no fixed universal value; consult manufacturer spec)
- Typical signal to seat control module is a voltage that varies within 0–5 V depending on circuit design — expected steady value at ambient temperature (refer to vehicle service manual)
- Open-circuit: infinite resistance / no voltage change when heating sensor area
- Short to ground: near 0 V at sensor signal line
- Short to battery: near battery voltage on signal line
Diagnostic algorithm
- Connect OEM-level scan tool; confirm B141D and clear then try to reproduce.
- Record live data for left rear climate seat temperature sensors while performing basic tests (hand-warm, sit, wiggle harness).
- Perform a thorough visual inspection of the left rear seat area: connectors, harness routing, and seat bottom/back for wear or water damage.
- Disconnect the sensor connector at the seat and inspect pins for corrosion, damage or pushed-out terminals; repair or replace connector as required.
- With connector disconnected, measure sensor resistance across its terminals at ambient temperature and while warming the sensor (compare change — resistance should decrease/increase depending on sensor type). Refer to Land Rover service data for exact resistance/voltage specifications.
- Backprobe connector at module side to verify the signal circuit to the module has continuity; repair any open/shorted wiring.
- Verify module power and ground are within specification. If wiring and sensor test good but signal still out of range, update or reprogram the seat climate control module per manufacturer procedure and re-test.
- If fault persists after wiring and module checks, replace the left rear seat temperature sensor assembly or the seat climate control module following manufacturer guidance.
- After repair, clear codes and perform a road/functional test to ensure the sensor reports properly and no recurrence occurs.
Likely causes
- Open or corroded connector at left rear seat sensor
- Damaged wiring/harness from seat travel or seat removal
- Failed thermistor sensor inside the left rear seat pad
Fault status
Status
Left rear climate-seat electric thermal device 2 temperature sensor — signal circuit fault (open/short/intermittent).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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