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Passenger's Thermistor Out Of Range High

NOTE: Perform MEMORY/HEATED SEATS VERIFICATION TEST  under VERIFICATION TESTS after each repair.
  1. Raise seat to highest position to access seat connectors. Disconnect passenger's heated seat cushion Black 4-pin connector located at rear of seat. Turn ignition off. Using DVOM, measure resistance between passenger's heated seat cushion connector terminals No. 3 (Black/Red wire) and No. 4 (Black/Red wire). Ensure seat is at room temperature. If resistance is greater than 800 ohms, go to next step. If resistance is less than 800 ohms, sensor is shorted. Replace passenger's heated seat cushion. See SEAT CUSHION under REMOVAL & INSTALLATION in POWER SEATS - GRAND CHEROKEE article. If resistance is greater than 1000 ohms, go to next step.
  2. Disconnect Heated Seat Module (HSM) C1 connector located at front of seat. Turn ignition on. Using DVOM, measure voltage between ground and HSM C1 connector terminal No. 18 (Brown/White wire). See Figure . If voltage is less than 5.5 volts, go to next step. If voltage is greater than 5.5 volts, repair short to voltage in Brown/White wire between HSM and passenger's heated seat cushion connector.
  3. Using DVOM, measure voltage between ground and HSM C1 connector terminal No. 18 (Brown/White wire). If no voltage is present, go to next step. If any voltage is present, repair short to voltage in Brown/White wire between HSM and passenger's heated seat cushion connector.
  4. Using DVOM, measure resistance between ground and HSM C1 connector terminal No. 18 (Brown/White wire). If resistance is greater than 1000 ohms, replace HSM. See MEMORY HEATED SEAT MODULE, HEATED SEAT MODULE OR MEMORY SEAT MODULE  under REMOVAL & INSTALLATION. If resistance is less than 1000 ohms, repair open circuit in Brown/White wire between HSM and passenger's heated seat cushion connector.
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