DTC P1570 Antenna: Wiring Diagram

Fig 1: Antenna - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK ANTENNA CIRCUIT. Turn the ignition switch to OFF. Disconnect the harness connector from the antenna. <Ref. to IMMOBILIZER ANTENNA .> Measure the resistance of the antenna circuit. Connector & terminal (B351) No. 1 - No.2:	Is the resistance less than 10 Ω?	Go to step 2.	Replace the antenna. <Ref. to IMMOBILIZER ANTENNA .>
2 CHECK ANTENNA CIRCUIT. Disconnect the harness connector from body integrated unit. Measure the resistance between harness connector and chassis ground. Connector & terminal (B281) No. 21 - Chassis ground:	Is the resistance less than 10 Ω?	Repair the harness.	Go to step 3.
3 CHECK ANTENNA CIRCUIT. Measure the resistance between harness connector and chassis ground. Connector & terminal (B281) No. 20 - Chassis ground:	Is the resistance less than 10 Ω?	Repair the harness.	Go to step 4.
4 CHECK ANTENNA CIRCUIT. Turn the ignition switch to ON. (engine OFF) Measure the voltage between harness connector and chassis ground. Connector & terminal (B281) No. 21 (+) - Chassis ground (-):	Is the voltage 0 V?	Go to step 5.	Repair the harness.
5 CHECK ANTENNA CIRCUIT. Measure the voltage between harness connector and chassis ground. Connector & terminal (B281) No. 20 (+) - Chassis ground (-):	Is the voltage 0 V?	Go to step 6.	Repair the harness between body integrated unit and antenna, because there is short circuit with battery voltage line or ignition switch "ON" line.
6 CHECK BODY INTEGRATED UNIT FUNCTION. Turn the ignition switch to OFF. Connect the harness connector to body integrated unit. Insert the key into the ignition switch, then measure changes in voltage between the antenna harness connectors. Connector & terminal (B281) No. 20 (+) - No. 21 (-):	Is the voltage -30 - 30 V? (Approx. 0.1 second after inserting the key) Is the voltage 0 V? (Approx. 1 second after inserting the key)	Go to step 7.	Replace the body integrated unit <Ref. to BODY INTEGRATED UNIT .> and replace all the ignition keys (including transponder). Execute the registration procedure next. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".
7 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 (including the transponder). Execute the registration procedure next. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".	Replace the body integrated unit <Ref. to BODY INTEGRATED UNIT .> and replace all the ignition keys (including transponder). Execute the registration procedure next. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER".