DTC B278D Id Code Box Judgment Circuit: Wiring Diagram

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

Fig 1: Push Button Start System Wiring Diagram

G10271479

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Turn the ignition switch to OFF. Using the Subaru Select Monitor, clear the keyless access system memory. < Ref. to CLEAR MEMORY MODE . > Turn the ignition switch to OFF → ON. Use the Subaru Select Monitor and read DTCs. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >	Is B278D displayed?	Go to step 2.	System is normal. It is possible that temporary poor contact occurs.
2 CHECK HARNESS. Disconnect the keyless access CM (Control Module) connector. Measure the resistance between keyless access CM (Control Module) connector and chassis ground. Connector & terminal (B573) No. 15 - Chassis ground:	Is the resistance 10 kΩ or more?	Replace the keyless access CM (Control Module). < Ref. to KEYLESS ACCESS CM (Control Module) . >	Repair or replace the short circuit of the harness.