DTC U0100 (J-A2), U1207 (J-A6), U12A4 (J-A7)

DTC U0100 or DTC screen J-A2  : Climate Control Unit Lost Communication With MG Module

DTC U1207 or DTC screen J-A6  : Climate Control Unit Lost Communication With ECOMP Module

DTC U12A4 or DTC screen J-A7  : Climate Control Unit Lost Communication With HVHTR Module

DTC (AC)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTCs with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode and then the READY TO DRIVE mode.

   -4. Check for DTCs.

   DTC Description	DTC
   U0100 Climate Control Unit Lost Communication With MG Module
   U1207 Climate Control Unit Lost Communication With ECOMP Module
   U12A4 Climate Control Unit Lost Communication With HVHTR Module

   Are any DTCs 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 climate control unit, the CAN gateway, the PCM, the electric A/C compressor, and the electric coolant heater. 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. CAN gateway system DTC check

   -1. 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. F-CAN circuit communication check (Receiving control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   Does the Climate control unit detect the CAN gateway Bus channels A?

   Yes: Bus A is Available

   Go to step 5.

   NO: Bus A is Not Available

   Go to step 4.

4. Open wire check (F-CAN A_H line, F-CAN A_L line)

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

   -2. Disconnect the following connectors.

   CAN gateway 16P connector

   Climate control unit connector A (32P)

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

   F-CAN_H line 

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Climate control unit connector A (32P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	Climate control unit connector A (32P) No. 8

   F-CAN_L line 

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Climate control unit connector A (32P): disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	Climate control unit connector A (32P) No. 24

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

   Is there continuity?

   YES 

   Replace the climate control unit .

   NO 

   Repair an open in the wire between the climate control unit and the CAN gateway.

5. F-CAN circuit communication check (transmitting control unit)

   -1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

   -2. According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.

   DTC	Transmitting control unit	Detected CAN getaway Bus channel(s) at normal
   U0100	PCM	A
   U1207	Electric A/C compressor	A
   U12A4	Electric coolant heater	A

   Is it detected normally?

   YES: Detected normal

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.

   NO: PCM is Not Available for Bus A

   Go to step 6.

   NO: Electric A/C compressor is Not Available for Bus A

   Go to step 6.

   NO: Electric coolant heater is Not Available for Bus A

   Go to step 6.

6. Open wire check (F-CAN A_H line, F-CAN A_L line)

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

   -2. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0100	PCM connector A (50P)
   U1207	Electric A/C compressor 4P connector
   U12A4	Electric coolant heater 4P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Transmitting control unit connector(s) for indicated DTCs: disconnected

   F-CAN A_H line 

   DTC	Connector	Terminal
   -	CAN gateway 16P connector (female terminals):	No. 3
   U0100	PCM connector A (50P)	No. 37
   U1207	Electric A/C compressor 4P connector (female terminals):	No. 1
   U12A4	Electric coolant heater 4P connector (female terminals):	No. 4

   F-CAN A_L line 

   DTC	Connector	Terminal
   -	CAN gateway 16P connector (female terminals):	No. 11
   U0100	PCM connector A (50P)	No. 36
   U1207	Electric A/C compressor 4P connector (female terminals):	No. 2
   U12A4	Electric coolant heater 4P connector (female terminals):	No. 3

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

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

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

   Is there continuity?

   YES 

   According to the detected DTC on the following table, replace the correspond control unit.

   DTC	Operation for transmitting control unit	Work
   U0100	PCM	Replace
   U1207	Electric A/C compressor	Replace
   U12A4	Electric coolant heater	Replace

   NO 

   Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the transmitting control unit and the CAN gateway.