DTC U0452: Invalid Data Received From Restraints Control Module

DTC detecting condition:

Invalid data was transmitted from airbag control module.

Trouble symptom:

The airbag does not operate normally.

CAUTION: When checking the airbag system, refer to the cautions regarding the airbag system prior to the inspection. Ref. to AIRBAG SYSTEM>GENERAL DESCRIPTION>CAUTION .

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 .

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 .
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 .
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 .
CHECK DTC .
Check the displayed DTC.

Is DTC U0452 displayed? (Current malfunction)

Yes : Go to 5 .

No : Go to 7 .
CHECK DTC .
1. Turn the ignition switch to OFF.
2. Disconnect the airbag 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)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC U0452 displayed? (Current malfunction)

Yes : Go to 6 .

No : Go to 7 .
CHECK DTC .
Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC U0452 detected in several modules? (Current malfunction)

Yes : Replace the airbag control module. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE .

No : Replace the module that the DTC has been detected.
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 U0452 displayed? (Current malfunction)

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

No : Go to 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.