DTC U1064 (2014 2015 2016)
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.
- Determine possible failure area (climate control unit power and ground, B-CAN line)
-1. Select B-CAN CONTROL UNITS INFORMATION from the BODY ELECTRICAL SYSTEM SELECT menu, and then select CHECK CONNECTED CONTROL UNITS.
- 2. Check the DETECT/NOT AVAILABLE information of the CLIMATE CONTROL/HVAC CONTROL UNIT.
Is DETECT indicated?
YES
Go to step 7.
NO
Go to step 3.
- Fuse check
-1. Check the following fuses.
Fuse No. D26 (7.5 A) Location Driver's under-dash fuse/relay box Is each fuse OK?
YES
Go to step 4.
NO
Replace the fuse. If the fuse blows again, repair a short to ground in the No. D26 (7.5 A) fuse circuit.
- Open wire check (IG2 HAC line)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Climate control unit connector B (28P) - 3. Turn the vehicle to the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode. Climate control unit connector B (28P): disconnected Test circuit IG2 HAC Test point 1 Climate control unit connector B (28P) No. 13 (LT GRN) Test point 2 Body ground Is there battery voltage?
YES
The IG2 HAC wire is OK. Go to step 5.
NO
Repair an open or high resistance in the wire.
- Open wire check (SGND line)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Check for continuity between test points 1 and 2 individually.
Test condition Vehicle OFF (LOCK) mode. Climate control unit connector B (28P): disconnected Test circuit SGND Test point 1 Climate control unit connector B (28P) No. 12 (BLK) Test point 2 Body ground Is there continuity?
YES
The SGND wire is OK. Go to step 6.
NO
Repair an open or high resistance in the ground wire or poor ground (G504).
- Open wire check (B-CAN lines)
-1. Disconnect the following connector.
Front seat heater control unit 14P connector - 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode. Front seat heater control unit 14P connector: disconnected. Climate control unit connector B (28P): disconnected Test circuit B-CAN_H Test point 1 Front seat heater control unit 14P connector No. 11 (PNK) Test point 2 Climate control unit connector B (28P) No. 9 (PNK) Is there continuity?
YES
An open or poor connection in the B-CAN_L wire between the front seat heater control unit and the climate control unit.
NO
An open or poor connection in the B-CAN_H wire between the front seat heater control unit and the climate control unit.
- Open wire check (B-CAN lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
Front seat heater control unit 14P connector Climate control unit connector B (28P) - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode. Front seat heater control unit 14P connector: disconnected. Climate control unit connector B (28P): disconnected Test circuit B-CAN_H Test point 1 Front seat heater control unit 14P connector No. 11 (PNK) Test point 2 Climate control unit connector B (28P) No. 9 (PNK) Is there continuity?
YES
An open or poor connection in the B-CAN_L wire between the front seat heater control unit and the climate control unit.
NO
An open or poor connection in the B-CAN_H wire between the front seat heater control unit and the climate control unit.