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Passenger's Thermistor Out Of Range Low

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 on. Using DVOM, measure voltage between passenger's heated seat cushion connector terminal No. 4 (Brown/White wire, harness side) and ground. If voltage is less than 4.5 volts, go to next step. If voltage is greater than 4.5 volts, go to step  3 .
  2. Turn ignition off. Disconnect Heated Seat Module (HSM) C1 connector located at front of seat. Using DVOM, measure resistance in Brown/White wire between HSM C1 connector terminal No. 18 and passenger's heated seat cushion connector terminal No. 4. See Figure . If resistance is less than 5 ohms, replace HSM. See MEMORY HEATED SEAT MODULE, HEATED SEAT MODULE OR MEMORY SEAT MODULE  under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open in Brown/White wire between HSM and passenger's heated seat cushion.
  3. 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 less than 70 k/ohms, go to next step. If resistance is greater than 70 k/ohms, replace passenger's heated seat cushion. See SEAT CUSHION under REMOVAL & INSTALLATION in POWER SEATS - GRAND CHEROKEE article.
  4. Using DVOM, measure resistance between ground and HSM C1 connector terminal No. 6 (Dark Green/Yellow wire). See Figure . If resistance is greater than 1000 ohms, go to next step. If resistance is less than 1000 ohms, repair short to ground in Dark Green/Yellow wire between HSM and passenger's heated seat cushion.
  5. Using DVOM, measure resistance between ground and HSM C1 connector terminal No. 6 (Dark Green/Yellow wire). If resistance is less than 1000 ohms, replace passenger seat cushion cover. If resistance is greater than 1000 ohms, go to next step.
  6. Disconnect HSM C1 connector. Using DVOM, measure resistance of Dark Green/Yellow wire between passenger's heated seat cushion connector terminal No. 3 and HSM C1 connector terminal No. 6. If resistance is less than 5 ohms, replace HSM See MEMORY HEATED SEAT MODULE, HEATED SEAT MODULE OR MEMORY SEAT MODULE  under REMOVAL & INSTALLATION. If resistance is greater than 5 ohms, repair open in Dark Green/Yellow wire between HSM and passenger's heated seat cushion.
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