Passenger Seat Heat Output Open

Monitored & Set Condition

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

Possible Causes:

• Passenger Seat Heater Ground Circuit Open
• Heated Seat Driver Circuit Open
• Passenger Seat Heater B+ Driver Wire Open
• Passenger Heated Seat Cushion Open
• Passenger Seat Back Heater Open
• Passenger Seat Heater System Open

Testing

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. See MEMORY HEATED SEAT/MIRROR MODULE  under REMOVAL & INSTALLATION. If resistance is 8.5 ohms or more, go to next step.
2. Reconnect MHSMM connector C3. 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 C3. 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. See POWER SEATS article.
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. 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.