DTC P0B4A (1050)

DTC P0B4A  : HV Battery Cell Voltage Sense Circuit 4

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (Electric Powertrain)

1. Problem verification (DTC check)

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0B4A HV Battery Cell Voltage Sense Circuit 4

   Is DTC P0B4A indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the battery module the battery condition monitor module. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Problem verification (update)

   -1. Clear the DTC with the HDS.

   -2. Do the battery condition monitor module update procedure .

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0B4A HV Battery Cell Voltage Sense Circuit 4

   Is DTC P0B4A indicated?

   YES 

   Go to step 3.

   NO 

   The update is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

3. Open wire check (VHB subharness)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the service plug and the IPU cover .

   -3. Remove the IPU and the IPU case .

   -4. Disconnect the following connectors.

   Battery condition monitor module connector B (28P)

   Battery condition monitor module connector C (28P)

   Battery module 2 28P connector

   Battery module 3 28P connector

   -5. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Battery condition monitor module connector B (28P): disconnected
   	Battery condition monitor module connector C (28P): disconnected
   	Battery module 2 28P connector: disconnected
   	Battery module 3 28P connector: disconnected

   Circuit name	Test point 1 (Battery condition monitor module connector B (28P) )	Test point 2 (Battery module 2 28P connector (male terminals)):
   VH36-0	No. 13	No. 13

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

   Circuit name	Test point 1 (Battery condition monitor module connector C (28P) )	Test point 2 (Battery module 3 28P connector (male terminals)):
   VH36-1	No. 15	No. 1
   VH37	No. 1	No. 3
   VH38	No. 16	No. 5
   VH39	No. 2	No. 17
   VH40	No. 17	No. 6
   VH41	No. 3	No. 18
   VH42	No. 18	No. 7
   VH43	No. 4	No. 19
   VH44	No. 19	No. 8
   VH45	No. 5	No. 20
   VH46	No. 20	No. 9
   VH47	No. 6	No. 21
   VH48	No. 7	No. 10

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

   Is there 1.0 Ω or less?

   YES 

   The VHB subharness is OK. Replace the battery condition monitor module and the battery pack .

   NO 

   Repair an open in the VHB subharness between the battery condition monitor module and the battery module.