DTC P1570 Antenna: Wiring Diagram

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Immobilizer system< Refer to Immobilizer System Wiring Diagram. >

Fig 1: Antenna And Body Integrated Unit - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

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 (B280) No. 25 - (B415) No. 1: (B280) No. 26 - (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 (B280) No. 25 - Chassis ground: (B280) No. 26 - 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 connector and the chassis ground. Connector & terminal (B280) No. 25 (+) - 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".