DTC U1064 (2017 2018 2019 2020)
DTC U1064 : Seat heater control unit lost communication with climate control unit (front seat)
| DTC Description | DTC |
|---|---|
| U1064 Seat heater control unit lost communication with climate control unit (front seat) |
DTC (Front Seat Heater Control Unit)
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2014 2015 2016), or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2017 2018 2019 2020) .
- The seat heater 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.
- 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 (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.
- Open wire check (B-CAN lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the receiving control unit connector.
With ventilated seat: Ventilated seat control unit 14P connector. Without ventilated seat: Front seat heater control unit 14P connector - 3. Disconnect the transmitting control unit connectors.
Climate control unit connector B (28P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode. With ventilated seat: Ventilated seat control unit 14P connector: disconnected. Without ventilated seat: Front seat heater control unit 14P connector: disconnected. Climate control unit connector B (28P): disconnected Test point 1 With ventilated seat: Ventilated seat control unit 14P connector (female terminals) No. 11: Without ventilated seat: Front seat heater control unit 14P connector (female terminals) No. 11:
Test point 2 Climate control unit connector B (28P) (female terminals) No. 9: Test point 1 With ventilated seat: Ventilated seat control unit 14P connector (female terminals) No. 10: Without ventilated seat: Front seat heater control unit 14P connector (female terminals) No. 10:
Test point 2 Climate control unit connector B (28P) (female terminals) No. 10: 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).
- Determine possible failure area (the receiving control unit or the transmitting control unit)
-1. Reconnect all connectors.
- 2. Clear the DTCs with the HDS.
- 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 receiving control unit connector. Check is OK, replace the ventilated seat control unit or the front seat heater control unit .
NO
The receiving control unit is OK at this time. Replace the climate control unit .