Except For C0 Model

DTC DETECTING CONDITION:

Communication error between Keyless Access Control Module and ECM

TROUBLE SYMPTOM:

Engine will not start.

WIRING DIAGRAM:

Push button start system <Ref. to WIRING DIAGRAM , Push Button Start System.>

Engine type: FA

Fig 1: Trunk/Rear Gate Internal Antenna Open - Wiring Diagram
Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Fig 2: IMM Circuit Except Antenna Circuit - Wiring Diagram (Engine Type EJ)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK GROUNDING POINT. Check the grounding point of the engine ground and chassis ground.	Are there any loose connections, any foreign objects caught in the ground lines or contact surface, or any fluid stains?	Remove the foreign matters, and tighten to the specified torque. Then start the engine, and check that the fault was removed. Check DTC <Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .>, and when DTC B1572 is still displayed, Go to step 2.	Go to step 2 .
2 CHECK CURRENT DATA. Turn the ignition switch to ON. Using the Subaru Select Monitor, check the data of «Keyless Access with Push Button Start». <Ref. to READ CURRENT DATA .> Display the next data. "Immobilizer" "Engine start" "Unlock confirmation" Data Immobilizer = Unset: Engine start = Engine start permission: Unlock confirmation = Confirmed:	Is the data displayed as indicated on the left?	Go to step 3 .	Perform diagnostics with phenomenon. <Ref. to ENGINE DOES NOT START , INSPECTION, Diagnostics with Phenomenon.>
3 CHECK CURRENT DATA. Use the Subaru Select Monitor to check the data of «Keyless Access with Push Button Start» when holding down the push button ignition switch while depressing the brake pedal (CVT model) or the clutch pedal (MT model). <Ref. to READ CURRENT DATA .> Data EGI code reception status = Reception: NOTE: If "Reception" is displayed, the status changes to "Not yet received" in 10 seconds. When performing the check again, perform the check after turning the ignition to OFF.	Is the data displayed as indicated on the left?	Go to step 4 .	Repair or replace the harness between Keyless Access Control Module and ECM.
4 CHECK WIRING HARNESS. Turn the ignition switch to OFF. Disconnect the Keyless Access Control Module connector and ECM connector. Using a tester, measure the resistance between the Keyless Access Control Module connector and ECM connector. Connector & terminal Engine type: FA (B572) No. 13 - (E158) No. 43: Engine type: EJ (B572) No. 13 - (B135) No. 25:	Is the resistance less than 10 Ω?	Go to step 5 .	Repair or replace the open circuit of harness.
5 CHECK WIRING HARNESS. Using a tester, measure the resistance between the Keyless Access Control Module connector and chassis ground. Connector & terminal (B572) No. 11 - Chassis ground:	Is the resistance less than 10 Ω?	Go to step 6 .	Repair or replace the open circuit of harness.
6 CHECK ECM. Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.	Is ECM registration finished? And does the engine start?	Replace the ECM. <Ref. to REMOVAL , Engine Control Module (ECM).> <Ref. to REMOVAL , Engine Control Module (ECM).> Install the ECM from other vehicle to the original vehicle.	Replace the Keyless Access Control Module. <Ref. to Keyless Access Control Module .>