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Passenger Seat Heat Output Open

NOTE: After making any repairs, perform MEMORY SYSTEMS VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition on. Raise driver seat to highest position to gain access to seat components and connectors. Turn ignition off. Disconnect Memory Heated Seat/Mirror Module (MHSMM) connector C3. Measure resistance between ground and MHSMM connector C3 terminal No. 6, passenger seat heater B+ driver circuit (Red/Tan wire). See Figure . If resistance is less than 8.5 ohms, replace MHSMM. If resistance is 8.5 ohms or more, go to next step.
  2. Ensure MHSMM connector is properly connected. Raise passenger seat to highest position to gain access to seat components and connectors. Disconnect passenger heated seat back cushion 2-pin connector. Measure resistance between ground and passenger heated seat back cushion 2-pin connector terminal "B", ground circuit (Black wire). If resistance is less than 5 ohms, leave passenger heated seat back cushion 2-pin connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Black wire.
  3. Disconnect passenger heated seat cushion 4-pin connector. Measure resistance of heated seat driver circuit (Brown/Black wire) between passenger heated seat back cushion 2-pin connector terminal "A" and passenger heated seat cushion 4-pin connector terminal "B". See Figure . If resistance is less than 5 ohms, leave passenger heated seat cushion 4-pin connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Brown/Black wire.
  4. Ensure passenger heated seat back cushion 2-pin connector is properly connected. Disconnect MHSMM connector. Measure resistance of passenger seat heater B+ driver circuit (Red/Tan wire) between passenger heated seat cushion 4-pin connector terminal "A" and MHSMM connector C3 terminal No. 6. See Figure and Figure . If resistance is less than 5 ohms, leave passenger heated seat cushion 4-pin connector disconnected, and go to next step. If resistance is 5 ohms or more, repair open in Red/Tan wire.
  5. Ensure MHSMM connector is properly connected. Measure resistance between passenger heated seat cushion connector (component side) terminal "A", passenger seat heater B+ driver circuit and terminal "B", heated seat driver circuit. See Figure . If resistance is less than 2 ohms, go to next step. If resistance is 2.0 ohms or more, replace passenger heated seat cushion.
  6. Disconnect passenger heated seat back cushion 2-pin connector. Measure resistance between passenger heated seat back cushion connector (component side) terminal "A", heated seat driver circuit and terminal "B", ground circuit. See Figure . If resistance is 2 ohms or more, replace passenger heated seat back cushion. If resistance is less than 2 ohms, fault may be intermittent. Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMS  . Repair any problems found as necessary. If no problems are found, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, test is complete.
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