Subaru Crosstrek Service Manual: Dtc u0427 invalid data received from vehicle security control module

DTC DETECTING CONDITION:

Defective data was transmitted from keyless access CM.

TROUBLE SYMPTOM:

Cooperation control of keyless access does not operate properly.

1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.

Was the basic diagnostic procedure performed up to STEP 3?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 2.

Perform the basic diagnostic procedure. Basic Diagnostic Procedure">

2.CHECK DTC.

Check the displayed DTC.

Are DTCs other than U*** displayed?

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 3.

3.CHECK DTC.

Check the displayed DTC.

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

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 4.

4.CHECK DTC.

Check the displayed DTC.

Is U0427 a current malfunction?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 5.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 9.

5.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect the keyless access CM connector.

3) Connect the disconnected connectors.

4) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is U0427 a current malfunction?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 6.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 9.

6.CHECK DTC.

Using the Subaru Select Monitor, read DTC of all the systems. Read Diagnostic Trouble Code (DTC)">

Is the smart data abnormal detected in several modules?

Replace the keyless access CM. Keyless Access CM">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 7.

7.REPLACE MODULE.

1) Replace the keyless access CM.

NOTE:

Do not register the keyless access CM.

2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is U0427 a current malfunction?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 8.

System is normal.

NOTE:

Be sure to perform keyless access CM registration.

8.CHECK MODULE.

1) Reinstall the keyless access CM.

2) Replace the body integrated unit. Body Integrated Unit">

3) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is U0427 a current malfunction?

Replace the keyless access CM. Keyless Access CM">

System is normal.

9.CHECK HARNESS.

1) Shake the harness, and check for poor contact.

2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is U0427 a current malfunction?

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

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0427 INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE">Go to Step 10.

10.CHECK CONNECTOR.

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

Is there poor contact of connector?

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

It is possible that temporary poor communication occurs. Delete the DTC.

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