Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

WARNING: This page is about a different variant/trim than selected.

Trouble symptom:

Cannot communicate with [Air Conditioner].

Detecting condition:

Defective harness connector
Power supply circuit malfunction
Defective CAN communication circuit
Defective Subaru Select Monitor

Wiring diagram:

Air conditioning system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .
CAN communication system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>CAN COMMUNICATION SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIR CONDITIONER (DIAGNOSTICS) (HEV)>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
  
  (i288) No. 8 (+) - Chassis ground (-):
  
  (i288) 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 (M/B No. 10, F/B No. 19)
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
  
  (i288) No. 4 - Chassis ground:
  
  (i288) 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. Turn the ignition switch to ON.
3. 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 .
Check the LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE .

Is the check result OK?

Yes : Go to 6.

No : Repair it according to the diagnosis for LAN system.
CHECK CONNECTOR .
Check poor contact of A/C control panel connector and data link connector.

Is the check result OK?

Yes : Go to 7.

No : Repair the connector.
CHECK FUSE .
1. Turn the ignition switch to OFF.
2. Remove the fuses No. 8 and No. 14 from main fuse box.
3. Check the 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 A/C control panel and fuse.
CHECK A/C CONTROL PANEL POWER SUPPLY CIRCUIT (OPEN) .
1. Disconnect the A/C control panel connector.
2. Turn the ignition switch to ON.
3. Measure the voltage between A/C control panel connector and chassis ground.
  Connector & terminal
  
  (i80) No. 2 (+) - Chassis ground (-):
  
  (i329) No. 4 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes : Go to 9.

No : Check for open or short circuit in the harness between A/C control panel and fuse.
CHECK A/C CONTROL PANEL GROUND CIRCUIT (OPEN) .
Measure the resistance of harness between A/C control panel and chassis ground.

Connector & terminal (i80) No. 3 - 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.