DTC : B1FA1

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

DTC (Second Row 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 - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
• The seat heater control unit does not turn on the seat heater until the seat core temperature is 85 degrees or less. Make sure the seat core temperature is below 85 degrees before troubleshooting.

1. Problem verification

   -1. Clear the DTCs with the HDS.

   Clear DTCs

   - 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 (second row 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. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Left second row seat heater connector A (4P)

   - 3. Turn the vehicle to the ON mode.

   - 4. Clear the DTCs with the HDS.

   Clear DTCs

   - 5. Check for DTCs with the HDS.

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

   Is DTC B1FA1 indicated?

   YES 

   Repair a short in the RR L TH+ wire.

   NO 

   Faulty left second row seat heater thermistor; replace the left second row Seat Cushion Heater .