DTC U1064 (Ventilated Seat Control Unit)

DTC U1064  : Seat heater control unit lost communication with climate control unit (front seat)

DTC (Ventilated Seat Control Unit)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
• The ventilated seat 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. Wait for at least 6 seconds.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   U1064 Seat heater control unit lost communication with climate control unit (front seat)

   Is DTC U1064 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Open wire check (B-CAN_H, B-CAN_L lines)

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

   -2. Disconnect the receiving control unit connector.

   Ventilated seat control unit 14P connector

   -3. Disconnect the transmitting control unit connector.

   Climate control unit connector A (32P)

   -4. Check for continuity between the receiving control unit and the transmitting control unit on the B-CAN_H circuit and the B-CAN_L circuit as specified in the table while in the vehicle OFF (LOCK) mode.

   DTC	CIRCUIT NAME	RECEIVING CONTROL UNIT	TRANSMITTING CONTROL UNIT
   U0164	B-CAN_H	Ventilated seat control unit 14P connector No. 11	Climate control unit connector A (32P) No. 23
   	B-CAN_L	Ventilated seat control unit 14P connector No. 10	Climate control unit connector A (32P) No. 24

   Is there continuity?

   YES 

   The B-CAN_L to B-CAN_H wire is OK. Go to step 3.

   NO 

   Repair an open or high resistance in the wire(s).

3. Determine possible failure area (the receiving control unit or the transmitting control unit)

   -1. Reconnect all connectors.

   -2. Clear the DTCs with the HDS.

   Clear DTCs

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

   -4. Wait for at least 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U1064 Seat heater control unit lost communication with climate control unit (front seat)

   Is DTC U1064 indicated?

   YES 

   Check for loose terminals and poor connections in the ventilated seat control unit connector. Check is OK, replace the ventilated seat control unit .

   NO 

   The ventilated seat control unit is OK at this time. Replace the transmitting control unit.

   (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

   DTC	TRANSMITTING CONTROL UNIT
   U0164	Replace the climate control unit