Nothing Is Displayed On The Screen Or Indicators Do Not Illuminate

WARNING: This page is about a different variant/trim than selected.

Trouble symptom:

Even when the AUTO switch is turned to ON with IGN ON, nothing is displayed on the screen or indicators do not illuminate.

Trouble causes:

A/C control panel power supply circuit failure
CAN communication failure

Wiring diagram:

Air conditioning system Ref. to WIRING SYSTEM (IMPREZA MODEL)> AIR CONDITIONING SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>AIR CONDITIONING SYSTEM>WIRING DIAGRAM .

Without Auto Start Stop

Courtesy of SUBARU OF AMERICA, INC.

With Auto Start Stop

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIR CONDITIONER (DIAGNOSTICS) (EXCEPT FOR HEV)> GENERAL DESCRIPTION> CAUTION .

CHECK FUSE .
1. Turn the ignition switch to OFF.
2. Remove a fuse from fuse and relay box.
3. Check the condition of fuse.
  Is the check result OK?
  
  Yes: Go to 2.
  
  No: Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in harness between the fuse - A/C control panel.
CHECK CONNECTOR .
Check poor contact of A/C control panel connector and coupling connector.

Is the check result OK?

Yes: Go to 3.

No: Repair the connector.
CHECK A/C CONTROL PANEL POWER SUPPLY CIRCUIT (OPEN OR SHORT) .
1. Remove the A/C control panel.
2. Disconnect the A/C control panel connector.
3. Turn the ignition switch to ON.
4. Measure the voltage between A/C control panel connector terminal and chassis ground.
  Connector and terminal
  
  (i88) No. 20 (+) - Chassis ground (-):
  
  (i88) No. 40 (+) - Chassis ground (-):
  
  (i88) No. 19 (+) - Chassis ground (-):
  
  Is the voltage 10 V or more?
  
  Yes: Go to 4.
  
  No: Check for open or short circuit in the harness between A/C control panel and fuse.
CHECK A/C CONTROL PANEL GROUND CIRCUIT (OPEN) .
1. Turn the ignition switch to OFF.
2. Measure the resistance of harness between A/C control panel and chassis ground.
  Connector and terminal
  
  (i88) No. 10 - Chassis ground:
  
  Is the resistance less than 10 Ω?
  
  Yes: Go to 5.
  
  No: Repair the harness for ground line.
CHECK FOR POOR CONTACT .
Check poor contact of A/C control panel connector.

Is the check result OK?

Yes: Replace the A/C control panel Ref. to AIR CONDITIONER (EXCEPT FOR HEV)> CONTROL PANEL .

No: Repair the connector.