Diagnostic Procedure for Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Defective power seat control module
Body integrated unit malfunctioning
Defective LIN 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 .

NOTE: If the communication with the body integrated unit is not possible either, refer to BODY CONTROL SYSTEM (DIAGNOSTICS). Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication>INSPECTION .

CHECK OTHER COMMUNICATION .
Perform communication with the system other than the power seat control module using the Subaru Select Monitor.

Is the communication to other control module possible?

Yes :

Go to 2.

No :

Perform inspection using the check sheet of communication for initializing for the LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication>INSPECTION>CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING .
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 connector of power seat control module.
3. Disconnect the connector of body integrated unit.
4. Connect the disconnected connectors.
5. Turn the ignition switch to ON.
6. Perform communication with the power seat control module 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 connector of power seat control module.
3. Turn the ignition switch to ON.
4. Using the tester, measure the voltage between power seat control module connector and chassis ground.
  Connector & terminal
  
  (R155) No. 10 (+) - Chassis ground (-):
  
  (R155) No. 11 (+) - Chassis ground (-):
  
  (R156) No. 3 (+) - Chassis ground (-):
  
  (R156) No. 8 (+) - Chassis ground (-):
Is the voltage 10 - 13 V?

Yes :

Go to 5.

No :

Repair the open circuit in harness between power seat control module connector and fuse.
CHECK HARNESS (OPEN CIRCUIT) .
Using the tester, measure the resistance between power seat control module connector and chassis ground.

Connector & terminal

(R156) No. 12 - Chassis ground:

(R156) No. 14 - 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 power seat control module connector and chassis ground.