Diagnostic Procedure For Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Defective keyless access control module
Defective CAN communication circuit
Defective Subaru Select Monitor

Trouble symptom:

Not communicable with Subaru Select Monitor.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

Wiring diagram:

Push button start system. Refer to WIRING SYSTEM>PUSH BUTTON START SYSTEM>WIRING DIAGRAM .
CAN communication system. Refer to WIRING SYSTEM>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Engine type: FA

Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Courtesy of SUBARU OF AMERICA, INC.

CHECK POWER SUPPLY CIRCUIT.
Connect DST-i to data link connector.

Does DST-i turn ON?

Yes: Go to 4.

No: Go to 2.
CHECK POWER SUPPLY CIRCUIT.
1. Turn the ignition switch to ON.
2. Using the tester, measure the voltage between data link connector and chassis ground.
  Connector & terminal
  
  (B40) No. 8 (+) - Chassis ground (-):
  
  (B40) No. 16 (+) - Chassis ground (-):
  
  Is the voltage 10 V or more?
  
  Yes: Go to 3.
  
  No: Repair the power supply circuit.
  NOTE:
  In this case, repair the following item:
  - Open or ground short circuit of harness between battery and data link connector
  - Blown out of fuse
CHECK HARNESS BETWEEN DATA LINK CONNECTOR AND CHASSIS GROUND (OPEN).
1. Turn the ignition switch to OFF.
2. Using a tester, measure the resistance between data link connector and chassis ground.
  Connector & terminal
  
  (B40) No. 4 - Chassis ground:
  
  (B40) No. 5 - Chassis ground:
  
  Is the resistance less than 5 Ω?
  
  Yes: Check for poor contact of the data link connector, and repair a fault, if any. When no fault is found, Go to 4.
  
  No: Repair the harness and connector.
CHECK SUBARU SELECT MONITOR.
1. Connect the Subaru Select Monitor to a normal vehicle.
2. Start the engine and perform communication between the Subaru Select Monitor and vehicle.
  Is communication possible?
  
  Yes: Go to 5.
  
  No: Use another Subaru Select Monitor because the CAN communication circuit of the Subaru Select Monitor is faulty.
CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Is the check result OK?

Yes: Go to 6.

No: Perform the diagnosis for LAN system.
CHECK CONNECTOR.
Check poor contact of keyless access control module connector, data link connector and coupling connector.

Is the check result OK?

Yes: Go to 7.

No: Repair the connector.
CHECK FUSE.
1. Turn the ignition switch to OFF.
2. Check the keyless access control module fuse. Refer to SECURITY AND LOCKS>RELAY AND FUSE .
  Is the check result OK?
  
  Yes: Go to 8.
  
  No: Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in harness between the keyless access control module and fuse.
CHECK KEYLESS ACCESS control module POWER SUPPLY CIRCUIT (OPEN).
1. Turn the ignition switch to ON.
2. Using a tester, measure the voltage between the keyless access control module connector and chassis ground.
  Connector & terminal
  
  (B573) No. 4 (+) - Chassis ground (-):
  
  (B573) No. 1 (+) - Chassis ground (-):
  
  (B573) No. 27 (+) - Chassis ground (-):
  
  (B573) No. 28 (+) - Chassis ground (-):
  
  Is the voltage 10 V or more?
  
  Yes: Go to 9.
  
  No: Repair the power supply circuit.
  
  Check for an open or short circuit in the harness between keyless access control module and fuse.
CHECK GROUND CIRCUIT OF KEYLESS ACCESS control module (OPEN).
Using a tester, measure the resistance between data link connector and chassis ground.

Connector & terminal

(B573) No. 20 - Chassis ground:

(B574) No. 17 - Chassis ground:

Is the resistance less than 5 Ω?

Yes: Check the connection between the data link connector and Subaru Select Monitor.

No: Repair the harness for ground line.