DTC U0430: Invalid Data Received From Tire Pressure Monitor Control Module And/Or Keyless Entry Control Module

DTC detecting condition: 

Defective data was transmitted from TPMS and keyless entry control module or keyless entry control module.

Trouble symptom: 

Keyless entry or TPMS 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) (EXCEPT FOR HEV)>BASIC DIAGNOSTIC 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) (EXCEPT FOR HEV)>BASIC DIAGNOSTIC PROCEDURE .

2. CHECK DTC (OTHER THAN U-CODE)  .

   Check the displayed DTC.

   Is DTC other than U*** displayed? (Current malfunction)

   Yes:  Perform the diagnosis for DTCs other than the displayed 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? (Current malfunction)

   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 U0430 displayed? (Current malfunction)

   Yes:  Go to  5.

   No:  Go to  7.

5. CHECK DTC  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TPMS and keyless entry control module or keyless entry control module connector.
   3. Connect the disconnected connectors.
   4. Turn the ignition switch to ON.
   5. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0430 displayed? (Current malfunction)

   Yes:  Go to  6.

   No:  Go to  7.

6. CHECK DTC  .

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

   Is DTC U0430 detected in body integrated unit? (Current malfunction)

   Yes:  Replace the TPMS and keyless entry control module or keyless entry control module. Ref. to SECURITY AND LOCKS>KEYLESS ENTRY CONTROL MODULE .

   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) (EXCEPT FOR HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0430 displayed? (Current malfunction)

   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.