DTC B1FA1

DTC B1FA1  : Left rear heater thermistor circuit short (rear seat)

DTC (Rear Seat Heater Control Unit)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• The seat heater control unit does not turn on the seat heater until the seat core temperature is 85°ees or less. Make sure the seat core temperature is below 85°ees before troubleshooting.

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

   -3. Wait for at least 90 seconds.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1FA1 Left rear heater thermistor circuit short (rear seat)

   Is DTC B1FA1 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. DTC check

   -1. Clear the DTCs with the HDS.

   -2. Turn the vehicle to the OFF (LOCK) mode.

   -3. Disconnect the following connector.

   Left rear seat heater connector A (4P)

   -4. Turn the vehicle to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   B1FA1 Left rear heater thermistor circuit short (rear seat)

   Is DTC B1FA1 indicated?

   YES 

   Repair a short in the RR L TH+ wire.

   NO 

   Faulty left rear seat heater thermistor; replace the left rear seat-back heater .