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DTC U1064 (Ventilated Seat Control Unit)

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DTC U1064  : Seat Heater Control Unit Lost Communication with Climate Control Unit

NOTE:
  • If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
  • According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the ventilated seat control unit.
  • Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.
DTC Description DTC
U1064 Seat heater control unit lost communication with climate control unit  

DTC (Ventilated Seat Control Unit)

  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. 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  

    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 line, B-CAN_L line)

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

    -2. Disconnect the receiving control unit connector.

    Ventilated seat control unit 24P connector

    -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector.

    DTC Connector
    U1064 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.

    Test condition Vehicle OFF (LOCK) mode
    Ventilated seat control unit 24P connector: disconnected
    Transmitting control unit connector for indicated DTC: disconnected
    DTC Circuit name Receiving control unit Transmitting control unit
    Connector Terminal Connector Terminal
    U1064 B-CAN_H Ventilated seat control unit 24P connector No. 10 Climate control unit connector A (32P) No. 25
    B-CAN_L No. 9 No. 8

    Is there continuity?

    YES 

    The B-CAN_H wire and the B-CAN_L wire are OK.

    Refer to the DTC shown on the display, then substitute or replace the control unit based on the instructions (see table).

    DTC Operation for transmitting control unit
    U1064 Substitute a known-good climate control unit , then recheck.
    If DTC U1064 goes away after substitution, replace the original climate control unit .

    NO 

    Repair an open in the B-CAN_H wire and/or the B-CAN_L wire between the ventilated seat control unit and the transmitting control unit.

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