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Home / DTC / B1224 — thermal Left control of the electrical device temperature seat

B1224 — thermal Left control of the electrical device temperature seat

Detailed page for trouble code B1224.

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Code

B1224

LAND ROVER B — Body

thermal Left control of the electrical device temperature seat

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 13 RU: 12
AI status
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Page language: EN

Causes

  • Open or short in left seat heater element or its wiring
  • Faulty left seat temperature sensor (thermistor) or connector
  • Corroded or loose connector at seat control module or heater element
  • Water ingress to seat (heater/sensor) or wiring harness
  • Seat control module failure or software fault
  • Blown fuse or poor ground/power supply to seat heater circuit

Symptoms

  • Left seat heater not working or operates intermittently
  • Seat heating disabled for left seat while right may work normally
  • DTC B1224 stored in body/seat control module and warning (if equipped)
  • Possible reduced heater current or heater cycles off quickly
  • Occasional fault history after moisture exposure or seat work

What to check

  • Read stored codes and freeze-frame data with a capable scan tool; note any related body or CAN bus codes
  • Visual inspection of left seat, connectors and wiring for damage, corrosion or moisture
  • Check fuses and power/ground at the seat heater/control module
  • Attempt to command left seat heater ON via diagnostic tool and observe current draw/response
  • Measure resistance of the left seat heater element (with seat disconnected) and compare to specification
  • Measure temperature sensor/thermistor resistance or voltage at the connector across temperature range

Signal parameters

  • Heater element resistance (typical): ~0.5–10 Ω (varies by vehicle/model) — compare to spec
  • Heater supply voltage (with command ON): battery voltage (≈12 V) at connector
  • Heater current draw when operating: commonly several amps (check spec) — abnormally low or zero indicates open circuit
  • Temperature sensor (thermistor) resistance: commonly in kΩ range at ambient (e.g., 1–10 kΩ) or voltage 0.1–4.9 V depending on temperature — compare to spec
  • Control module status messages: seat heater status, temperature sensor reading and any thermal-protection flags available via diagnostic tool

Diagnostic algorithm

  1. Connect a diagnostic scanner, read B1224 and any related codes. Record freeze-frame data and live data for left seat temperature/switch/relay status.
  2. Attempt to command the left seat heater ON with the scanner. Note whether the module responds and whether current is drawn.
  3. Perform a visual inspection: look for water, damaged upholstery, loose or corroded connectors under the seat and along the harness to the B-pillar.
  4. With ignition off and battery isolated per manufacturer safety procedures, disconnect the left seat heater connector and measure the resistance of the heater element. Compare to the vehicle specification.
  5. Measure continuity and insulation to chassis (no short to ground). Repair any open/shorted circuits.
  6. Measure the seat temperature sensor (thermistor) resistance or voltage at the seat connector with known ambient temperature or while warmed; compare to specification. Replace sensor if out of range.
  7. Check supply voltage and ground at the seat control module connectors while commanding the heater. Repair poor power/ground connections or replace blown fuse/relay if found.
  8. If wiring, heater element, and sensor verify OK, suspect seat control module fault — verify software updates and replace module only after confirming harness and seat components are good.
  9. After repairs, clear codes, perform full function test and repeat steps to confirm no reoccurrence. Re-check for water ingress or causes of original failure.

Likely causes

  • Damaged heater element or open circuit in left seat pad
  • Defective or intermittent temperature sensor/thermistor in left seat
  • Connector corrosion or wiring harness damage at the seat
  • Seat module disabled left heater due to overtemperature or sensor fault

Fault status

⚠️ Status
Thermal fault on left seat temperature control detected. Heater circuit or temperature sensor has reported an over‑temperature or protection activation; left seat heating may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1220 B1223 B1225 B1234 B1260
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