Subaru Crosstrek Service Manual: Dtc b278d id code box judgment circuit

DTC detecting condition:

• When ID code box setting is set to OFF, ID code box ON input is detected.

• When ID code box setting is set to OFF, ID code box LIN signal is received.

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

1.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Using the Subaru Select Monitor, clear the memory of «Keyless Access with Push Button Start». Clear Memory Mode">

3) Turn the ignition switch to OFF > ON.

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

Is DTC B278D displayed?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B278D ID CODE BOX JUDGMENT CIRCUIT">Go to Step 2.

Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

2.CHECK HARNESS.

1) Disconnect the keyless access CM connector.

2) Measure the resistance between keyless access CM connector and chassis ground.

Connector & terminal

(B573) No. 15 — Chassis ground:

Is the resistance 10 k? or more?

Replace the keyless access CM. Keyless Access CM">

Repair or replace the short circuit of the harness.

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