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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)
...

Other materials:

Inspection mode procedure
Perform the diagnosis shown in the following DTC table.When performing the diagnosis not listed in “List of Diagnostic Trouble Code (DTC)”, refer to the item on the drive cycle. Drive CycleDTCItemConditionB1570ANTENNA — B1571REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM) — B ...

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