Seat Heaters

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Fig 1: Identifying Left Seat Heating Module (SHM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The system for the seat heaters consists of three different parts:

a seat heating module (SHM) which controls the function for communicating with the climate control module (CCM)
two heater pads
a temperature sensor.

The seat heating module (SHM) is under the left and right-hand front seat. The heater pads are in the seat and backrest. The temperature sensor is in the seat.

The seat heating module (SHM) is directly connected to the heater pad and temperature sensor. The seat heating module (SHM) communicates with the climate control module (CCM) via a LIN bus.

There are diagnostics for the seat heating module (SHM).