Code Definition

B1B65 (15) — Seat Heater Temperature Sensor Circuit – Short to Battery or Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Land Rover

About B1B65

B1B65 is a manufacturer-specific body diagnostic trouble code recorded for Land Rover vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1B65 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1B65 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Seat Control Module (SCM) or on some models the HVAC control module monitors a thermistor type temperature sensor embedded in the seat heater pad, using its resistance to judge the heating mat temperature and regulate power to keep it within the calibrated comfort band. The sensor typically operates on a 5V pull up circuit, with the signal voltage falling as the seat warms and the thermistor resistance drops. DTC B1B65:15 is stored when the module sees a signal voltage above the expected upper threshold for longer than the fail timer allows, which corresponds to either an open circuit (sen...

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