DTC B1FAC

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

   DTC Description	DTC
   B1FAC Left rear heater current abnormal low (rear 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. 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 B (3P)

   -4. Connect terminals A and B with a jumper wire.

   Terminal A	Left rear seat heater connector B (3P) (male terminals) No. 3:
   Terminal B	Body ground

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

   -5. Turn the vehicle to the ON mode.

   -6. Check for DTCs with the HDS.

   DTC Description	DTC
   B1FAC Left rear heater current abnormal low (rear 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

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

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

   Test point 1	Left rear seat heater connector B (3P) (female terminals) No. 1:
   Test point 2	Left rear seat heater connector B (3P) (female terminals) No. 2:

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

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   Replace the left rear seat cushion heater .

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

   -1. Disconnect the following connector.

   Left rear seat heater connector A (4P)

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

   Terminal A	Left rear seat heater connector A (4P) (male terminals) No. 1:
   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 rear seat heater connector A (4P): disconnected Left rear seat heater connector B (3P): disconnected
   Test point 1	Left rear seat heater connector B (3P) (male terminals) No. 2:
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Go to step 5.

   NO 

   Repair an open or high resistance in the wire.

5. Seat heater check 2

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

   Test condition	Vehicle OFF (LOCK) mode Left rear seat heater connector A (4P): disconnected Left rear seat heater connector B (3P): disconnected
   Test point 1	Left rear seat heater connector A (4P) (female terminals) No. 1:
   Test point 2	Left rear seat heater connector A (4P) (female terminals) No. 4:

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

   Is there continuity?

   YES 

   Go to step 6.

   NO 

   Replace the left rear seat-back heater .

6. Open wire check (GND lines)

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

   Test condition	Vehicle OFF (LOCK) mode Left rear seat heater connector A (4P): disconnected Left rear seat heater connector B (3P): disconnected
   Test point 1	Left rear seat heater connector A (4P) (male terminals) No. 4:
   Test point 2	Body ground

   Test point 1	Left rear seat heater connector B (3P) (male terminals) No. 1:
   Test point 2	Body ground

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

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

   Is there continuity?

   YES 

   Replace the rear seat heater control unit .

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G602).