DTC B1570 Antenna: Wiring Diagram

Immobilizer system. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Immobilizer System - Wiring Diagram (Antenna)

G06654240

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK ANTENNA CIRCUIT. Turn the ignition switch to OFF. Disconnect the connector from the antenna. Refer to IMMOBILIZER ANTENNA . Measure the resistance of antenna circuit. Connector & terminal (B415) No. 1 - No. 2:	Is the resistance 6 - 10 Ω?	Go to step 2 .	Replace the antenna. Refer to IMMOBILIZER ANTENNA .
2 CHECK ANTENNA CIRCUIT. Disconnect the connector from body integrated unit. Measure the resistance between body integrated unit connector and antenna connector. Connector & terminal (B281) No. 1 - (B415) No. 1: (B281) No. 2 - (B415) No. 2:	Is the resistance less than 10 Ω?	Go to step 3 .	Repair the harness.
3 CHECK ANTENNA CIRCUIT. Measure the resistance between body integrated unit connector and chassis ground. Connector & terminal (B281) No. 1 - Chassis ground: (B281) No. 2 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the harness.
4 CHECK BODY INTEGRATED UNIT FUNCTION. Connect the connector to antenna. Connect the connector to body integrated unit. Insert the key into the ignition switch, then use an oscilloscope to measure changes in voltage between the antenna connectors. Connector & terminal (B281) 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 5 .	Replace the body integrated unit Refer to BODY INTEGRATED UNIT . Register all ignition keys (transponders). Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".
5 CHECK IGNITION KEY (TRANSPONDER). Remove the key from ignition switch. Start the engine using other key which is already registered.	Does the engine start?	Replace the ignition key (transponder). Execute the registration procedure next. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".	Replace the body integrated unit Refer to BODY INTEGRATED UNIT . Register all ignition keys (transponders). Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".