DTC : B1FAC

DTC B1FAC  : Left rear heater current abnormal low (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. Check for DTCs with the HDS.

   DTC Description	DTC
   B1FAC Left rear heater current abnormal low (second row seat)

   Is DTC B1FAC 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 B (3P)

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Left second row seat heater connector B (3P) No. 3
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

   - 4. Turn the vehicle to the ON mode.

   - 5. Clear the DTCs with the HDS.

   Clear DTCs

   - 6. Check for DTCs with the HDS.

   DTC Description	DTC
   B1FAC Left rear heater current abnormal low (second row seat)

   Is DTC B1FAC indicated?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   Go to step 3.

3. Seat heater check

   -1. Measure the resistance between test points 1 and 2, refer to the following table.

   Test condition	Vehicle OFF (LOCK) mode Left second row seat heater connector B (3P): disconnected
   Test point 1	Left second row seat heater connector B (3P) No. 1
   Test point 2	Left second row seat heater connector B (3P) No. 3

   Courtesy of HONDA, U.S.A., INC.

   Is there more than 6.3 Ω (at 20 °C)?

   YES 

   Replace the left Second Row Seat-Back Heater .

   NO 

   Go to step 4.

4. Open wire check (HTR CUSH/BACK line)

   -1. Disconnect the following connector.

   Left second row seat heater connector A (4P)

   - 2. Connect terminals A and B with a jumper wire.

   Terminal A	Left second row seat heater connector A (4P) No. 4
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Left second row seat heater connector B (3P): disconnected
   Test point 1	Left second row seat heater connector B (3P) No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the left Second Row Seat Cushion Heater .

   NO 

   Repair an open or high resistance in the wire.