DTC B2784: Antenna Circuit (Push Engine Switch)

DTC detecting condition: 

When open or short circuit occurs in the antenna coil.

Trouble symptom: 

The keyless access function may not be operable.

Wiring diagram: 

Immobilizer system Ref. to WIRING SYSTEM>Immobilizer System>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK STEERING LOCK CONTROL MODULE  .
   1. Disconnect the push button ignition switch connector.
   2. Disconnect the keyless access CONTROL MODULE connector.
   3. Using a tester, measure the resistance between the push button ignition switch connector and the keyless access CONTROL MODULE connector terminals.

      Connector & terminal 

      (i150) No. 14 - (B574) No. 1:

      (i150) No. 9 - (B574) No. 9:

      (i150) No. 10 - (B574) No. 7:

      (i150) No. 8 - (B574) No. 24:

   Is the resistance less than 1 Ω?

   Yes: Go to  2

   No: Repair or replace the open circuit of harness.

2. CHECK HARNESS (GROUND SHORT CIRCUIT)  .

   Using a tester, measure the resistance between the push button ignition switch connector and chassis ground terminals.

   Connector & terminal 

   (i150) No. 14 - Chassis ground:

   (i150) No. 9 - Chassis ground:

   (i150) No. 10 - Chassis ground:

   Is the resistance 10 kΩ or more?

   Yes: Go to  3

   No: Repair or replace the short circuit of the harness.

3. CHECK PUSH BUTTON IGNITION SWITCH  .
   1. Replace the push button ignition switch. Ref. to SECURITY AND LOCKS>Push Button Ignition Switch
   2. Using the Subaru Select Monitor, clear the memory. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>Clear Memory Mode 
   3. Read the DTC using Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) 

   Is DTC B2784 displayed?

   Yes: Replace the keyless access CONTROL MODULE. Ref. to SECURITY AND LOCKS>Keyless Access CONTROL MODULE

   No: Malfunction occurred in the push button ignition switch.