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

DTC P1574 KEY COMMUNICATION FAILURE

DTC DETECTING CONDITION:

Communication failure between key and the body integrated unit

STEPCHECKYESNO

1.CHECK BODY INTEGRATED UNIT FUNCTION.

Insert the key into the ignition switch (LOCK position), then measure changes in voltage between the antenna connectors.

Connector & terminal

(B415) No. 1 (+) — No. 2 (−):

Is the voltage −30 — 30 V? (Approx. 0.1 second after inserting the key) Is the voltage 0 V? (Approx. 1 second after inserting the key)

Replace the body integrated unit, Replace all ignition keys (including the transponder). Execute the registration procedure next. Refer to the “PC application help for Subaru Select Monitor”.

2.CHECK IGNITION KEY (TRANSPONDER).

1) Remove the key from ignition switch.

2) Start the engine using other key which is already registered.

Does the engine start?

Replace the ignition key (including the transponder). Execute the registration procedure next. Refer to the “PC application help for Subaru Select Monitor”.

Replace the body integrated unit, Replace all ignition keys (including the transponder). Execute the registration procedure next. Refer to the “PC application help for Subaru Select Monitor”.