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Driver Seat Heat Output Open

NOTE: After making any repairs, perform MEMORY HEATED SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.

Monitored & Set Condition

  1. When Monitored: Ignition on, during the heated seat operation.
  2. Set Condition: This code is set immediately after the Memory Heated Seat/Mirror Module loses the seat heat element output.

Possible Causes:

  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. 12, driver seat heater B+ driver circuit (Red/Dark Green wire). See Figure . If resistance is less than 8.5 ohms, replace MHSMM. See MEMORY HEATED SEAT/MIRROR MODULE  under REMOVAL & INSTALLATION. If resistance is 8.5 ohms or more, leave MHSMM connector C3 disconnected and go to next step.
  2. Disconnect driver heated seat cushion 4-pin connector. Measure resistance of driver seat heater B+ driver circuit (Red/Dark Green wire) between driver heated seat cushion 4-pin connector terminal "A" and MHSMM connector C3 terminal No. 12. See Figure . If resistance is less than 5 ohms, leave driver heated seat cushion 4-pin connector disconnected and go to next step. If resistance is 5 ohms or more, repair open in Red/Dark Green wire.
  3. Disconnect driver heated seat back cushion 2-pin connector. Measure resistance of heated seat driver circuit (Brown/Black wire) between driver heated seat cushion 4-pin connector terminal "B" and driver heated seat back cushion 2-pin connector terminal "A". If resistance is less than 5 ohms, leave driver heated seat back cushion 2-pin connector disconnected and go to next step. If resistance is 5 ohms or more, repair open in Brown/Black wire.
  4. Measure resistance between ground and driver heated seat back cushion 2-pin connector terminal "B", ground circuit (Black wire). If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open in Black wire.
  5. Disconnect driver heated seat cushion 4-pin connector. Measure resistance between driver heated seat cushion connector (component side) terminal "A", driver seat heater B+ driver circuit and terminal "B", heated seat driver circuit. See Figure . If resistance is less than 2.5 ohms, go to next step. If resistance is 2.5 ohms or more, replace driver heated seat cushion. See POWER SEATS article.
  6. Disconnect driver heated seat back cushion 2-pin connector. Measure resistance between driver 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 driver heated seat back cushion. See POWER SEATS article. 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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