Passenger Thermistor Out Of Range High

WARNING: This page is about a different car, the 2002 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

When Monitored: With the ignition on, during the heated seat operation.

Set Condition: This condition is immediately set when the Heated Seat Module (HSM) senses a greater value than the value stored in EEPROM.

Possible Causes are:

PASSENGER SEAT SENSOR SHORTED
PASSENGER SEAT TEMPERATURE SENSOR INPUT CIRCUIT SHORTED TO BATTERY
PASSENGER SEAT TEMPERATURE SENSOR INPUT CIRCUIT SHORTED TO 5 VOLTS
HEATED SEAT MODULE SENSOR SHORTED
SEAT SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

NOTE: Raise the seat to the highest position to gain access to the connectors. The HSM is located at the front of the seat and the Seat Heater connectors are at the rear of the seat.

Turn ignition off. Disconnect the Passenger Heated Seat Cushion 4-way connector. Measure the resistance between the seat sensor 5-volt supply circuit and the Passenger Seat Temperature Sensor Input circuit at the Passenger Heated Seat Cushion (cushion side) connector. Is the resistance less than 800 ohms at room temperature? If yes, replace the passenger heated seat cushion (sensor shorted). Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, go to next step.
Turn ignition off. Disconnect the Heated Seat Module C1 harness connector. Disconnect the Passenger Heated Seat Cushion 4-way connector. Turn ignition on. Measure the voltage between the Passenger Seat Temperature Sensor Input circuit and ground. Is the voltage more than 5.5 volts? If yes, repair the passenger seat temperature sensor input circuit for a short to battery. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, go to next step.
Turn ignition off. Disconnect the Heated Seat Module C1 harness connector. Disconnect the Passenger Heated Seat Cushion 4-way connector. Turn ignition on. Measure the voltage between the Passenger Seat Temperature Sensor Input circuit and ground. Is there any voltage on the Passenger Seat Temperature Sensor Input circuit? If yes, repair the passenger seat temperature sensor input circuit for a short to voltage. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, go to next step.
Turn ignition off. Disconnect the Heated Seat Module C1 connector. Disconnect the Passenger Heated Seat Cushion 4-way (Green) connector. Measure the resistance of the seat sensor 5-volt supply circuit to ground. Is the resistance less than 1000 ohms? If yes, repair the open Seat Sensor 5-Volt Supply circuit. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS. If no, replace the heated seat module. Perform MEMORY SYSTEM VERIFICATION TEST under VERIFICATION TESTS.