DTC B278D Id Code Box Judgment Circuit: 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 Judgment - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTICS PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Turn the ignition switch to OFF. Using the Subaru Select Monitor, clear the memory of «keyless access with push button start». < Ref. to CLEAR MEMORY MODE . > Turn the ignition switch to OFF → ON. Read DTC using the Subaru Select Monitor. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is DTC B278D 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. Disconnect the keyless access control module connector. Measure the resistance between keyless access control module connector and chassis ground. Connector & terminal (i241) No. 23 - Chassis ground:	Is the resistance 10 kΩ or more?	Replace the keyless access control module. < Ref. to KEYLESS ACCESS CONTROL MODULE . >	Repair or replace the short circuit of the harness.