Code Definition

B1A73 — Left Seat Heater

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

About B1A73

B1A73 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.

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.

B1A73 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 monitors the electrical circuit feeding the heating element fitted to the left front seat cushion and backrest. DTC B1A73 is stored when the module detects an abnormal condition on the heater output, including an open circuit, a short to ground, a short to battery, or an actual current draw that deviates from the expected range based on the commanded heater stage. The seat heater element is a low resistance mat that draws several amps when energised, and the module monitors current via a shunt or a smart driver to verify correct element operation and to protect the circ...

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