KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

The power supply CM engine start request output circuit is open or shorted.

TROUBLE SYMPTOM:

Engine will not start.

CAUTION:

When the power supply CM is replaced with a new unit, and the battery ground terminal is connected, it will become ignition ON. Also, if the battery is disconnected, it will resume to a condition with the battery cut off.

WIRING DIAGRAM:

• Gasoline engine model

• Diesel engine model

STEP	CHECK	YES	NO
1.CHECK FUSE. 1) Turn the ignition switch to OFF. 2) Check fuse (FB-18 No. 7).	Is the fuse blown out?	Replace the fuse (FB-18). If the replaced fuse has blown out easily, repair the short circuit in the harness between the fuse holder and the power supply CM.
2.CONTINUITY CHECK OF WIRING HARNESS. 1) Disconnect the power supply CM connector (B420). 2) Measure the voltage between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 12 (+) — Chassis ground (−): (B420) No. 33 (+) — Chassis ground (−):	Is the voltage 10 V or more?		Repair the open circuit or short in the harness between the power supply CM and the fuse.
3.CHECK WIRING HARNESS. Using a tester, check continuity between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 6 — Chassis ground: (B420) No. 40 — Chassis ground:	Is there continuity?		Repair or replace the open circuit location in the wiring harness.
4.CHECK WIRING HARNESS. 1) Disconnect the ECM connector (B136) and power supply CM connector. 2) Using a tester, check continuity between the ECM connector and the power supply CM connector. Connector & terminal Turbo model (B420) No. 39 (+) — (B136) No. 32 (−): Non-turbo model (B420) No. 39 (+) — (B136) No. 34 (−): Diesel engine model (B420) No. 39 (+) — (B134) No. 27 (−):	Is there continuity?		Repair or replace the open circuit of harness.
5.CHECK WIRING HARNESS. Using a tester, check continuity between the power supply CM connector and chassis ground. Connector & terminal (B420) No. 39 — Chassis ground:	Is there continuity?	Repair or replace the open circuit of harness.
6.CHECK DTC. 1) Connect the disconnected connectors. 2) Using the Subaru Select Monitor, read the DTC of the power supply CM after 25 seconds have passed from ignition ON.	Is B2104 (Steering lock position signal error) displayed?	Perform the diagnosis according to the DTC.
7.CHECK STEERING LOCK CM. Using a tester, check continuity between the power supply CM and chassis ground when the steering lock CM is unlocked. Connector & terminal (B420) No. 26 — Chassis ground:	Is there continuity?		Check the steering lock.
8.CHECK POWER SUPPLY CM. 1) Disconnect the engine ECM connector. 2) Depress the brake pedal, and press the push button ignition switch. 3) Using a tester, measure the voltage between the power supply CM and chassis ground. Connector & terminal (B420) No. 12 (+) — Chassis ground (−):	Does the voltage change from less than 1 V → 2 V or more?	Perform fault diagnosis for the engine system.	Replace the power supply CM.