Climate Control System DTC D-B8, C7

DTC screen D-B8 or DTC screen C7  : Electric A/C Compressor Lost Communication

1. Problem verification

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

   -2. Do the Self-Diagnostic Function with the climate control unit .

   -3. Check for DTCs.

   Is Error on the DTC screen D-B8 or DTC screen C7 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. CAN gateway system DTC check

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

   -2. Connect the HDS to the DLC .

   -3. Turn the vehicle to the ON mode.

   -4. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC

   Are any DTCs indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC(s) .

   NO 

   Go to step 3.

3. Open wire check (F-CAN D_H line, F-CAN D_L line)

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

   -2. Disconnect the following connectors.

   Electric A/C compressor 4P connector

   CAN gateway 16P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric A/C compressor 4P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	Electric A/C compressor 4P connector (female terminals) No. 4:
   Test point 2	CAN gateway 16P connector (female terminals) No. 7:

   Test point 1	Electric A/C compressor 4P connector (female terminals) No. 3:
   Test point 2	CAN gateway 16P connector (female terminals) No. 15:

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

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

   Is there 1.0 Ω or less?

   YES 

   Replace the electric A/C compressor .

   NO 

   Repair an open in the F-CAN D_H wire or the F-CAN D_L wire between the electric A/C compressor and the CAN gateway.