CHECK BODY INTEGRATED UNIT FUNCTION.

1) Connect the connector to antenna.

2) Connect the connector to body integrated unit.

3) Insert the key into the ignition switch, then use an oscilloscope to measure changes in voltage between the antenna connector and the chassis ground.

Connector & terminal

(B280) No. 25 (+) — Chassis ground (−):

QUESTION
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)
Yes	No
	Replace the body integrated unit Register all ignition keys (transponders). Refer to the “PC application help for Subaru Select Monitor”.