DTC B2789 Id Code Box Communication: Wiring Diagram

WARNING: This page is about a different car, the 2016 Subaru Outback and 2016 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For the coupling connector, refer to "WIRING SYSTEM".
Keyless access with push button start system < Ref. to appropriate wiring diagram in SYSTEM WIRING DIAGRAM article. >

Fig 1: ID Code Box Communication - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTICS PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Using the Subaru Select Monitor, clear the memory. < Ref. to CLEAR MEMORY MODE . > Read DTC using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC B2789 displayed?	Go to step 2 .	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2 CHECK HARNESS (OPEN CIRCUIT). Disconnect the keyless access control module connector. Disconnect the ID code box connector. Using the tester, measure the resistance between terminals. Connector & terminal (i241) No. 13 - (i47) No. 2:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair or replace the open circuit of harness.
3 CHECK HARNESS (GROUND SHORT CIRCUIT). Using a tester, measure the resistance between the keyless access control module connector and chassis ground, and between ID code box connector and chassis ground. Connector & terminal (i241) No. 13 - 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 (OPEN CIRCUIT). Using a tester, measure the resistance between ID code box connector and chassis ground. Connector & terminal (i47) 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 (i33) No. 1 (+) - Chassis ground (-):	Is the voltage 11 - 14 V?	Go to step 6 .	Repair or replace the faulty portion of the power supply circuit.
6 CHECK ID CODE BOX. Using the Subaru Select Monitor, clear the memory. < Ref. to CLEAR MEMORY MODE . > Read DTC using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC B2785 displayed?	Replace the keyless access control module. < Ref. to KEYLESS ACCESS CONTROL MODULE . >	Go to step 7 .
7 CHECK ID CODE BOX. Turn the ignition switch to ON. Using the Subaru Select Monitor, clear the memory. < Ref. to CLEAR MEMORY MODE . > Read DTC using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC B2789 displayed?	Replace the ID code box. < Ref. to ID CODE BOX . >	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.