Seat Ventilation Switch Is Not Displayed

Trouble symptom: 

The operation mode display on the center information display does not change, even if the seat ventilation switch is touched.

Trouble causes: 

• Seat ventilation Control Module failure
• A/C Control Module failure
• Seat ventilation circuit failure
• Seat heater circuit failure
• Center information display failure
• Cockpit control module failure
• Seat ventilation blower failure

Wiring diagram: 

Seat ventilation system. Refer to WIRING SYSTEM>Seat Ventilation System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK SEAT VENTILATION SWITCH DISPLAY  .
   1. Turn the ignition switch to OFF.
   2. Disconnect and reconnect the battery.
   3. Turn the ignition switch to ON.
   4. Touch the seat indicator on the center information display.
   5. Check if the seat ventilation switch is displayed under the seat heater switch.

   Are the driver's side and passenger's side seat ventilation switches displayed?

   Yes  : Temporary failure occurs.

   No  : Go to  2.

2. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the following DTCs using Subaru Select Monitor. Refer to VENTILATION SEAT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to COCKPIT CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
   • Ventilation Seat
   • Body Control
   • Air Conditioner
   • Cockpit Control

   Are any DTCs displayed?

   Yes  : Perform the diagnosis for the displayed DTCs. Refer to VENTILATION SEAT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to AIR CONDITIONER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to COCKPIT CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   No  : Go to  3.

3. CHECK CONNECTOR  .
   1. Turn the ignition switch to OFF.
   2. Check connecting condition of the seat ventilation Control Module connector (St41), seat connectors (L57) (R57), coupling connectors (B43) (L51) (R51) (St21) (St22), and blower connectors (St71) (St72).

   Is the check result OK?

   Yes  : Go to  4.

   No  : Repair the connector.

4. CHECK CONNECTOR  .

   Check malfunctions (terminal bends, etc.) of the passenger's side seat connector (St1) and seat ventilation Control Module connector (St41).

   Is the check result OK?

   Yes  : Go to  5.

   No  : Repair the connector.

5. CHECK CAN COMMUNICATION LINE  .

   Inspect LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE .

   Is the check result OK?

   Yes  : Replace the seat ventilation Control Module. Refer to SEATS>SEAT VENTILATION SYSTEM .

   No  : Perform the inspection according to the diagnosis for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE .