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Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Subaru select monitor / Inspection

1. COMMUNICATION FOR INITIALIZING IMPOSSIBLE

Communication error with keyless access system

DETECTING CONDITION:

• Defective harness

• Power supply circuit malfunction

• Defective keyless access CM

• Defective CAN communication circuit

• Defective Subaru Select Monitor

TROUBLE SYMPTOM:

Not communicable with Subaru Select Monitor.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

– Keyless access with push button start system Keyless Access With Push Button Start System > WIRING DIAGRAM

– CAN communication system CAN Communication System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK FUSE.

1) Turn the ignition switch to OFF.

2) Check the fuse for keyless access CM. Relay and Fuse > INSPECTION

Is there any fault-

Replace the fuse. If the replaced fuse has blown out immediately, repair the short circuit to ground in harness between fuse and keyless access CM.

Subaru Select Monitor > INSPECTION

2.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the keyless access CM connector.

2) Using a tester, measure the voltage between the keyless access CM connector (harness side) and chassis ground.

Connector & terminal

(i75) No. 24 (+) — Chassis ground (−):

(i241) No. 40 (+) — Chassis ground (−):

Is the voltage 10 V or more-

Subaru Select Monitor > INSPECTION

Repair the open circuit of harness between fuse and keyless access CM connector.

3.CHECK HARNESS (OPEN CIRCUIT).

1) Turn the ignition switch to ON.

2) Using a tester, measure the voltage between the keyless access CM connector (harness side) and chassis ground.

Connector & terminal

(i75) No. 11 (+) — Chassis ground (−):

(i75) No. 12 (+) — Chassis ground (−):

Is the voltage 10 V or more-

Subaru Select Monitor > INSPECTION

Check IG relay circuit.

4.CHECK HARNESS (OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

2) Using a tester, measure the resistance between the keyless access CM connector (harness side) and chassis ground.

Connector & terminal

(i75) No. 1 — Chassis ground:

(i241) No. 21 — Chassis ground:

Is the resistance less than 1 --

Subaru Select Monitor > INSPECTION

Repair the open circuit of harness between keyless access CM connector and chassis ground.

5.CHECK LAN SYSTEM.

Inspect LAN system. Basic Diagnostic Procedure

Is there any fault-

Perform the inspection according to the diagnosis for LAN system.

Subaru Select Monitor > INSPECTION

6.CHECK KEYLESS ACCESS CM.

Communicate with the keyless access system.

Is communication possible-

Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Replace the keyless access CM. Keyless Access CM

Operation
• For detailed operation procedures, refer to “Application help”.• When the keyless access system cannot communicate with Subaru Select Monitor, perform “COMMUNICATION FO ...

Lan system (diagnostics)
...

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