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DTC P1574 Key Communication Failure: DTC Detecting Condition

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Communication failure between key and body integrated unit

DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 CHECK BODY INTEGRATED UNIT FUNCTION. 
Insert the key into the ignition switch (LOCK position), then measure changes in voltage between the antenna connector and the chassis ground.
Connector & terminal 
(B415) No. 1 (+) - Chassis ground (-): 		 Is the maximum voltage more than 40 V? (Approx. 0.1 second after inserting the key) Is the voltage 0 V? (Approx. 1 second after inserting the key) Go to step 2  . Replace the body integrated unit < Refer to BODY INTEGRATED UNIT . > Register all ignition keys (transponders). 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? Register ignition keys (transponders). Refer to the PC application help for Subaru Select Monitor. Replace the body integrated unit < Refer to BODY INTEGRATED UNIT . > Register all ignition keys (transponders). Refer to the PC application help for Subaru Select Monitor.
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