DTC U1446: <HBA>Invalid Data Received From Body Control Module

DTC detecting condition: 

Defective data was transmitted from body integrated unit.

Trouble symptom: 

HBA does not operate normally.

1. CHECK CAN COMMUNICATION HARNESS  .

   Perform the basic diagnostic procedure to check for fault in CAN communication harness. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE 

   Was the basic diagnostic procedure performed up to step 7?

   Yes  : Go to  2.

   No  : Perform the basic diagnostic procedure. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE 

2. CHECK DTC (OTHER THAN U-CODE)  .

   Check the displayed DTC.

   Is DTC other than U**** displayed?

   Yes  : Perform the diagnosis for the displayed DTCs other than U-code.

   No  : Go to  3.

3. CHECK DTC (U-CODE)  .

   Check the displayed DTC.

   Is DTC for the bus off or the data no-receive displayed?

   Yes  : Perform the diagnosis for DTCs for the displayed bus off or the data no-receive.

   No  : Go to  4.

4. CHECK DTC  .

   Check the displayed DTC.

   Is DTC U1446 displayed? (Current code)

   Yes  : Go to  5.

   No  : Go to  7.

5. CHECK DTC (CURRENT CODE)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the body integrated unit connector.
   3. Connect the disconnected connectors.
   4. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is DTC U1446 displayed? (Current code)

   Yes  : Go to  6.

   No  : Go to  7.

6. CHECK DTC  .

   Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is DTC U1446 detected in body integrated unit? (Current code)

   Yes  : Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT

   No  : Replace the module that the DTC has been detected.

7. CHECK HARNESS  .
   1. Shake the harness, and check for poor contact.
   2. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is DTC U1446 displayed? (Current code)

   Yes  : Repair the poor contact of harness, or replace the harness.

   No  : Go to  8.

8. CHECK CONNECTOR  .

   Check the connector used for high speed CAN for poor contact.

   Is there poor contact of connector?

   Yes  : Repair the connector that has poor contact, or replace harness.

   No  : It is possible that temporary poor communication occurs. Delete the DTC.