Subaru Crosstrek manuals

Subaru Crosstrek Service Manual: Dtc b1574 key communication

IMMOBILIZER (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC B1574 KEY COMMUNICATION

DTC DETECTING CONDITION:

Communication failure between key and body integrated unit

CAUTION:

When the body integrated unit is replaced, registration of the immobilizer system is required. For details, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

STEPCHECKYESNO

1.CHECK IGNITION KEY.

1) Remove the ignition key from the ignition switch.

2) Insert the ignition key into the ignition switch, and then turn the ignition switch to ON.

3) Perform the Clear Memory Mode. Clear Memory Mode">

4) Read the DTC of the body integrated unit. Read Diagnostic Trouble Code (DTC)">

Is DTC B1410 detected?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1574 KEY COMMUNICATION">Go to Step 2.

Even if DTC is detected, 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 IGNITION KEY.

1) Prepare a spare ignition key that is already registered.

2) Insert the ignition key into the ignition switch, and then turn the ignition switch to ON.

3) Perform the Clear Memory Mode. Clear Memory Mode">

4) Read the DTC of the body integrated unit. Read Diagnostic Trouble Code (DTC)">

Is DTC B1410 detected?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1574 KEY COMMUNICATION">Go to Step 3.

Ignition key unit was defective.

3.CHECK IMMOBILIZER ANTENNA.

1) Replace the immobilizer antenna. Immobilizer Antenna">

2) Insert the ignition key into the ignition switch, and then turn the ignition switch to ON.

3) Perform the Clear Memory Mode. Clear Memory Mode">

4) Read the DTC of the body integrated unit. Read Diagnostic Trouble Code (DTC)">

Is DTC B1410 detected?

Replace the body integrated unit. Body Integrated Unit">

Immobilizer antenna was defective.

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