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Home >> Subaru >> 2015 >> WRX Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security And Locks - Keyless Access (W/ Push Button Start) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC B278D Id Code Box Recognition Judgment Abnormal >> Wiring Diagram

DTC B278D Id Code Box Recognition Judgment Abnormal: Wiring Diagram

Push button start system <Ref. to STARTING/CHARGING , Push Button Start System.>

Fig 1: Push Button Start System - Wiring Diagram
G10271479Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC  .
  1. Turn the ignition switch to OFF.
  2. Using the Subaru Select Monitor, clear the keyless access system memory.
  3. Turn the ignition switch to OFF → ON.
  4. Use the Subaru Select Monitor and read DTCs.
 Is B278D displayed? Go to step 2  . System is normal. It is possible that temporary poor contact occurs.
2 CHECK HARNESS  .
  1. Disconnect the keyless access control module connector.
  2. Measure the resistance between keyless access control module connector and chassis ground.

    Connector & terminal 

    (B573) No. 15 - 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.
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