Grand Cherokee 2WD L6-4.0L VIN S (1997)
Seat Heater Control Module: Description and Operation
HEATED SEAT CONTROL MODULE
The Heated Seat Control Module (HSCM) is an electronic thermostatic module designed to operate the electric seat heater elements. Two
modules are used in the vehicle, one for each front seat. The HSCM for each seat is mounted to a bracket under the seat cushion spring. The
bracket is secured to the inside surface of the outboard seat cushion frame with a single screw driven through the frame from the outside.
Inputs to the module include the multiplex resistor instrument panel switch signals (which includes the seat cushion temperature sensor circuits),
an ignition-switched battery feed, a non-switched battery feed, and a ground. The only HSCM output is the feed for the seat heating elements.
The HSCM cannot be repaired and, if faulty, it must be replaced.
