Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Defective seat position memory 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 (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 seat position memory 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 seat position memory control module connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between the seat position memory control module connector and chassis ground.
  Connector & terminal
  
  (R156) No. 24 (+) - Chassis ground (-):
  
  (R156) No. 18 (+) - Chassis ground (-):
  
  (R155) No. 1 (+) - Chassis ground (-):
Is the voltage 9 - 16 V?

Yes Go to 5.

No Repair the open circuit of harness between the seat position memory 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 seat position memory control module connector and chassis ground.
  Connector & terminal
  
  (R155) No. 2 - Chassis ground:
  
  (R156) No. 21 - Chassis ground:
Is the resistance less than 1 Ω?

Yes Replace the seat position memory control module. Ref. to SEATS>POWER SEAT SYSTEM .

No Repair the open circuit of harness between the seat position memory control module connector and chassis ground.