Code
B1223
LAND ROVER
B — Body
seating right bank temperature sensor
Views:
UK: 7
EN: 10
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty/right seat temperature sensor (NTC thermistor or integrated sensor assembly)
- Open, short or high-resistance wiring between sensor and seat control module
- Corroded, damaged or loose connector at the sensor or module
- Water ingress or contamination in the seat cushion or connector
- Faulty seat control module or related body control module software/firmware error
- Recent seat repair or replacement with incorrect parts or pinout
Symptoms
- Seat temperature/seat heating or comfort temperature control for right seat not operating correctly
- Instrument cluster or infotainment message indicating seat temperature or seat fault
- Diagnostic trouble code B1223 stored in body/seat module and possibly related modules
- Live data for right seat temperature shows no change, fixed value, or out-of-range reading
What to check
- Retrieve and record DTCs and freeze-frame data with a compatible scan tool; check for additional B-codes
- Visually inspect right seat cushion area, sensor connector and wiring harness for damage, corrosion, water ingress or loose pins
- Backprobe sensor connector and read live data for seat temperature using scan tool while wiggling harness to check for intermittent faults
- Measure resistance of the seat temperature sensor at ambient temp and compare to expected behavior (resistance should change when warmed/cooled)
- Check continuity between sensor connector and seat control module pins; check for short to ground or battery
- Inspect service history for recent seat removal/repair that could have disturbed wiring or sensor
Signal parameters
- Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
- Expected behavior: resistance should change with temperature; typical order-of-magnitude in many seat sensors is low kilo-ohms at room temperature and higher at cold temps (example typical range across 0–50°C roughly ~2–20 kΩ) — consult manufacturer data for exact values
- Module interface: sensor is read as a resistance or low-voltage signal; live-data voltage typically within 0.5–4.5 V range depending on module reference (verify with service data)
- Open-circuit: very high or infinite resistance; short-circuit: near 0 Ω or fixed voltage near 0 V or battery voltage
Diagnostic algorithm
- Connect an advanced diagnostic tool and confirm B1223 and any related codes; record freeze-frame and live-data values for the right seat temp sensor.
- Clear the code, perform an ignition cycle, and see if B1223 returns to confirm repeatability.
- Perform visual inspection of the right seat cushion, underside, sensor harness and connector for damage, water, foreign objects or pin corrosion.
- Backprobe the sensor connector with the connector plugged and read live-data temperature/resistance/voltage while warming the sensor (hair dryer/heat gun on low) and cooling (air blow). The reading should change smoothly; no change indicates sensor or wiring fault.
- With ignition off and battery disconnected if required by manufacturer, disconnect the sensor and measure its resistance across terminals at ambient. Then heat the sensor slightly and confirm resistance decreases (NTC behavior).
- Check continuity and resistance between the sensor connector and the seat/body control module connector pins to locate open or high-resistance sections. Check for short to ground or battery.
- Verify reference supply and signal reference at the module connector (backprobe) per service data — ensure proper reference voltage/pull-up presence.
- If wiring and connector OK and sensor does not respond properly, replace the right-seat temperature sensor or seat cushion assembly per service manual.
- If replacing sensor does not clear issue, test/replace the seat control module or consult manufacturer software updates. After repair, clear codes and confirm fault does not return during function test.
Likely causes
- Broken or chafed wiring between sensor and module
- Corroded/loose connector at the seat sensor
- Failed temperature sensor element
Fault status
Status
Seating right bank temperature sensor circuit fault — open/short/implausible signal detected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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