Diagnostic Procedure For Subaru Select Monitor Communication: Inspection

Detecting condition:

Defective harness
Power supply circuit malfunction
Power Seat and Remote Control Mirror control module malfunctioning
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 BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

CHECK OTHER COMMUNICATION .
1. Turn the ignition switch to ON.
2. 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 and Remote Control Mirror control module connector.
3. Disconnect the body integrated unit connector.
4. Connect the disconnected connectors.
5. Turn the ignition switch to ON.
6. 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 and Remote Control Mirror control module connector.
3. Turn the ignition switch to ON.
4. Using a tester, measure the voltage between Power Seat and Remote Control Mirror control module connector and chassis ground.
  Connector and terminal
  
  (R502) No. 2 (+) - Chassis ground (-):
  
  (R502) No. 8 (+) - Chassis ground (-):
  
  (R502) No. 9 (+) - Chassis ground (-):
Is the voltage 9 - 16 V?

Yes: Go to 5 .

No: Repair the open circuit of the harness between Power Seat and Remote Control Mirror control module connector and the fuse.
CHECK HARNESS (OPEN CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Using a tester, measure the resistance between Power Seat and Remote Control Mirror control module connector and chassis ground.
  Connector and terminal
  
  (R502) No. 10 - Chassis ground:
  
  (R504) No. 2 - Chassis ground:
Is the resistance less than 1 Ω?

Yes: Replace Power Seat and Remote Control Mirror control module. Ref. to SEATS>POWER SEAT SYSTEM .

No: Repair the open circuit in harness between Power Seat and Remote Control Mirror control module connector and chassis ground.