DTC B2789 Id Code Box Communication: Wiring Diagram

Push button start system wiring diagram. Refer to appropriate SYSTEM WIRING DIAGRAMS article.

Engine type: FA

Fig 1: Push Button Start System Wiring Diagram (Engine Type FA)
Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Fig 2: Push Button Start System Wiring Diagram (Engine Type EJ)
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Use the Subaru Select Monitor and read DTCs. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is B2789 displayed?	Go to step 2.	Check the connector.
2 CHECK HARNESS. Disconnect the keyless access CM (Control Module) connector. Disconnect the ID code box connector. Using the tester, measure the resistance between terminals. Connector & terminal (B574) No. 17 - (B422) No. 2:	Is the resistance less than 1 Ω?	Go to step 3.	Repair or replace the open circuit of harness.
3 CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM (Control Module) connector and chassis ground, and between ID code box connector and chassis ground. Connector & terminal (B574) No. 17 - Chassis ground: (B422) No. 2 - Chassis ground:	Is the resistance 10 kΩ or more?	Go to step 4.	Repair or replace the short circuit of the harness.
4 CHECK HARNESS. Using a tester, measure the resistance between ID code box connector and chassis ground. Connector & terminal (B422) No. 5 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 5.	Repair or replace the open circuit of harness.
5 CHECK HARNESS. Using a tester, measure the voltage between ID code box connector and chassis ground. Connector & terminal (B422) No. 1 (+) - Chassis ground (-):	Is the voltage 11 - 14 V?	Go to step 6.	Repair or replace the open circuit of harness.
6 CHECK ID CODE BOX. Replace the ID code box. < Ref. to ID CODE BOX . > Using the Subaru Select Monitor, clear the memory. < Ref. to CLEAR MEMORY MODE . > Use the Subaru Select Monitor and read DTCs. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is B2789 displayed?	Replace the keyless access CM (Control Module). < Ref. to KEYLESS ACCESS CM (Control Module) . >	ID code box has an error.