Grand Cherokee 2WD Limited V8-4.7L (2002)
Seat Heater: Testing and Inspection
Heated Seat Element
RESISTOR WIRE ELEMENT
1. Disconnect and isolate the battery negative cable. The power seat wire harness connectors for the seat cushion and seat back heating elements are
secured to a bracket located under the rear edge of the seat cushion frame. Refer to Wiring for complete circuit schematics and connector
locations.
2. Disconnect the Heated Seat Module (HSM) or Memory Heated Seat Module (MHSM) C2 connector. Check for continuity between the SEAT
HEATER B(+) DRIVER circuit cavity of the C2 connector and the seat cushion frame. There should be NO continuity If OK, go to Step 3. If not
OK, repair the shorted seat heater B(+) driver circuit as required.
NOTE: WHEN CHECKING HEATED SEAT ELEMENTS FOR CONTINUITY, BE CERTAIN TO MOVE THE HEATING ELEMENT
BEING CHECKED. MOVING THE ELEMENT, SUCH AS SITTING IN THE SEAT WILL ELIMINATE THE POSSIBILITY OF AN
INTERMITTENT OPEN IN THE ELEMENT WHICH WOULD ONLY BE EVIDENT IF THE ELEMENT WAS MOVED IN A CERTAIN
DIRECTION. FAILURE TO CHECK THE ELEMENT IN VARIOUS POSITIONS COULD RESULT IN AN INCOMPLETE TEST.
3. Check for continuity between the SEAT HEATER B(+) DRIVER circuit cavity of the C2 connector and the ground circuit cavity. There should be
continuity at all times (even upon moving or sitting in the seat). If OK, proceed with testing the other components in the heated seat system. If not
OK, replace the open heating element. Refer to the procedure in this section.
