Grand Cherokee 4WD V8-5.2L VIN Y (1998)
Seat Heater Control Module: Description and Operation
SYSTEM OPERATION
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 installed in a wire harness connector that is located under the
seat cushion spring. The wire harness connector is secured by an integral clip to the inside surface of the outboard seat cushion frame.
Inputs to the module include the instrument panel resistor multiplexed 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 or damaged, it must be replaced.
