Check signal between BCM connector and ground with oscilloscope.
Is the Inspection result normal?
YES >> GO TO 4
NO >> GO TO 2 2.CHECK OUTSIDE KEY ANTENNA CIRCUIT
Disconnect BCM and front outside handle connector.
Check continuity between BCM connector and outside key antenna connector.
Check continuity between BCM connector and ground.
Is the Inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness between BCM and outside key antenna. 3.CHECK OUTSIDE KEY ANTENNA INPUT SIGNAL 2
Replace outside key antenna. (New antenna or other antenna)