Diagnostic Procedure For Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Defective power seat control module
Defective CAN communication circuit
Defective Subaru Select Monitor

Trouble symptom:

Not communicable with Subaru Select Monitor.

Wiring diagram:

Power seat system Ref. to WIRING SYSTEM>POWER SEAT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>General Description>CAUTION .

CHECK OTHER COMMUNICATION .
Communicate with the system other than [Power Seat Memory] using the Subaru Select Monitor.

Is the communication to other control module possible?

Yes : Go to 2 .

No : Perform the "Communication for Initializing Impossible" of LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
CHECK LAN SYSTEM .
Perform the inspection for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is the check result OK?

Yes : Go to 3 .

No : Perform the diagnosis according to the inspection for LAN system.
CHECK FOR POOR CONTACT .
1. Turn the ignition switch to OFF.
2. Disconnect the power seat control module connector.
3. Connect the disconnected connectors.
4. Turn the ignition switch to ON.
5. Communicate with [Power Seat Memory] using the Subaru Select Monitor.
  Is communication possible?
  
  Yes : 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.
  
  No : Go to 4 .
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the power seat control module connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between the power seat control module connector and chassis ground.
  Connector and terminal
  
  (St42) No. 24 (+) - Chassis ground (-):
  
  (St42) No. 18 (+) - Chassis ground (-):
  
  Is the voltage 9 - 16 V?
  
  Yes : Go to 5 .
  
  No : Repair the open circuit of harness between the power seat control module connector and fuse.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Using a tester, measure the resistance between the power seat control module connector and chassis ground.
  Connector and terminal
  
  (St43) No. 2 - Chassis ground:
  
  (St42) No. 21 - Chassis ground:
  
  Is the resistance less than 1 Ω?
  
  Yes : Replace the power seat control module. Ref. to SEATS>POWER SEAT SYSTEM .
  
  No : Repair the open circuit of harness between the power seat control module connector and chassis ground.