Grand Cherokee 2WD Limited V8-4.7L (2002)
Seat Heater Sensor: Testing and Inspection
For complete circuit diagrams, refer to Wiring Diagrams.
1. Disconnect the Heated Seat Module (HSM) or Memory Heated Seat Module (MHSM) C1 connector. Check for continuity between the SEAT
SENSOR 5V SUPPLY circuit cavity and the seat cushion frame. There should be NO continuity. If OK, go to Step 2. If not OK, repair the shorted
seat sensor 5V supply circuit as required.
2. Check for continuity between the SEAT SENSOR 5V SUPPLY circuit cavity of the 4-way power seat wire harness connector and the C1
connector for the HSM or MHSM. There should be continuity. If OK, go to Step 3. If not OK, repair the open seat sensor 5V supply circuit as
required.
3. Connect the module electrical connector. Turn system ON, using a voltmeter, backprobe the HSM or MHSM C1 connector on the SEAT
TEMPERATURE SENSOR INPUT circuit cavity. Voltage should be present (2-4 volts). If OK, proceed with testing the other components in the
heated seat system. If not OK, refer to Heated Seat Module Diagnosis and Testing in the electronic control modules section.
