Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Defective TPMS & keyless entry Control Module or keyless entry Control Module
Defective CAN communication circuit
Defective Subaru Select Monitor

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

Keyless entry system Refer to WIRING SYSTEM>KEYLESS ENTRY SYSTEM .
CAN communication system Refer to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ENTRY (DIAGNOSTICS)>General Description>CAUTION .

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
  
  (i221) No. 8 (+) - Chassis ground (-):
  
  (i221) 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 the tester, measure the resistance between data link connector and chassis ground.
  Connector & terminal
  
  (i221) No. 4 - Chassis ground:
  
  (i221) 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 establish 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>PROCEDURE .

Is LAN system OK?

Yes: Go to 6.

No: Perform the inspection according to the diagnosis for LAN system.
CHECK CONNECTOR .
Check TPMS & keyless entry Control Module connector or keyless entry Control Module connector, data link connector or intermediate connector for poor contact.

Is the connector OK?

Yes: Go to 7.

No: Repair the connector.
CHECK FUSE .
1. Turn the ignition switch to OFF.
2. Remove a fuse from the fuse box.
3. Check the fuse. Refer to SECURITY AND LOCKS>RELAY AND FUSE .
Is the fuse 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 TPMS & keyless entry Control Module or keyless entry Control Module and fuse.
CHECK TPMS & KEYLESS ENTRY Control Module OR KEYLESS ENTRY Control Module POWER SUPPLY CIRCUIT (OPEN) .
1. Disconnect the TPMS & keyless entry Control Module connector or keyless entry Control Module connector.
2. Turn the ignition switch to ON.
3. Measure the voltage between the TPMS & keyless entry Control Module connector or the keyless entry Control Module connector and chassis ground.
  Connector & terminal
  
  Without TPMS
  
  (L83) No. 12 (+) - Chassis ground (-):
  
  With TPMS
  
  (L83) No. 6 (+) - Chassis ground (-):
  
  (L83) No. 12 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes: Go to 9.

No: Check for open or short circuit in the harness between the TPMS & keyless entry Control Module or keyless entry Control Module and fuses.
CHECK GROUND CIRCUIT FOR TPMS & KEYLESS ENTRY Control Module OR KEYLESS ENTRY Control Module (OPEN CIRCUIT) .
Measure the resistance in harness between TPMS & keyless entry Control Module connector or keyless entry Control Module connector and chassis ground.

Connector & terminal

(L83) No. 7 - Chassis ground:

Is the resistance less than 1 Ω?

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

No: Repair the harness for ground line.