B13ED

Code

LAND ROVER B — Body

Right rear - Foot - air duct temperature sensor

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 20 RU: 16

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Page language: EN

Causes

Open or shorted sensor wiring or connector (damage, chafing, corrosion)
Loose, corroded or pushed-out connector pins at sensor or control module
Faulty temperature sensor (NTC thermistor) in the right rear foot air duct
Poor ground or missing reference voltage to the sensor
Water ingress or contamination of sensor/connector
HVAC control module fault or internal input circuit failure

Symptoms

Incorrect or inconsistent temperature reading for right rear foot zone
Rear foot HVAC zone does not reach commanded temperature or cycles incorrectly
HVAC system displays a climate control fault or zone unavailable message
Temperature balancing issues between zones (one zone warmer/colder)
Fault code stored and possibly recurring after drive cycles

What to check

Read stored and pending codes with a proper OEM-level scan tool; note freeze-frame/live data
Visually inspect the right rear foot sensor, its connector and harness for damage, water or corrosion
Wiggle the harness and connector while monitoring live sensor value to check for intermittent behaviour
Backprobe the sensor connector and measure reference voltage, signal voltage and ground with ignition on
Measure sensor resistance with connector disconnected (compare to expected thermistor behaviour vs temperature)
Check continuity between sensor connector and HVAC control module pins; check for shorts to ground or battery

Signal parameters

Sensor type: NTC thermistor (resistance decreases as temperature increases) — common in HVAC duct sensors
Signal: low-voltage analog input to HVAC module (typical 0.5–4.5 V operating range on many systems)
Resistance range: typical thermistor values may be around 10 kΩ at ~25°C (varies by manufacturer); resistance should change noticeably between cold and warm
Expected behavior: smooth, monotonic change in resistance/voltage as sensor temperature changes (no open-circuit or fixed-value readings)

Diagnostic algorithm

Verify code presence and history using a scan tool. Note if code is current, intermittent, or stored.
Inspect the right rear foot sensor and harness visually for damage, water intrusion, loose or corroded connector pins. Repair any visible issues.
With ignition ON (engine off) and HVAC operating, monitor live data for the right rear foot sensor. Wiggle harness and connector to look for intermittent changes.
Measure the sensor signal circuit: backprobe the connector and check reference voltage and ground. Typical sensor signals are low-voltage analog; confirm reference voltage is present and stable.
Disconnect the sensor and measure its resistance at ambient temperature. If possible, warm or cool the sensor (hold with warm air or ice pack) and confirm resistance changes smoothly. If resistance is open/short or does not change, replace sensor.
Check continuity between the sensor connector and the HVAC control module input pin; check for shorts to ground or battery voltage.
If wiring and sensor test good, consult wiring diagram for the HVAC module and verify input circuit at the module. If module input is not responding correctly despite good sensor/wiring, consider HVAC control module fault.
After repair, clear codes and perform a functional test of climate zones. Re-scan to confirm the code does not return and monitor long enough to verify repair.

Likely causes

Sensor element failed (out of specification resistance/response)
Connector contact corrosion or bent pins causing intermittent connection
Wiring short to ground or to battery/10–12V source (pinched harness)
Open circuit in harness between sensor and HVAC control module
Intermittent fault due to movement (wiring chafe or loose connector)

Fault status

⚠️ Status

Right rear (rear foot) air duct temperature sensor circuit fault — open/short/implausible signal detected by HVAC control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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B13ED — Right rear - Foot - air duct temperature sensor