Nothing Is Displayed On The Screen Or Indicators Do Not Illuminate
Trouble symptom:
- When the AUTO button is pressed with IGN ON, nothing is displayed on the screen or indicators do not illuminate.
- Self diagnosis using A/C control panel does not operate.
Trouble causes:
- A/C control panel power supply circuit failure
- CAN communication failure
Wiring diagram:
Air conditioning system Ref. to WIRING SYSTEM>Air Conditioning System>WIRING DIAGRAM .
- CHECK FUSE.
- Turn the ignition switch to OFF.
- Remove a fuse from fuse & relay box.
- 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 for poor contact of connector.
Is the check result OK?
- Yes : Go to 3.
- No : Repair the connector.
- CHECK A/C CONTROL PANEL POWER CIRCUIT.
- Remove the A/C control panel.
- Disconnect the A/C control panel connector.
- Measure the voltage between A/C control panel connector terminal and chassis ground after turning the ignition switch to ON.
Connector & terminal
(i88) No. 15 (+) - Chassis ground (-):
(i88) No. 31 (+) - Chassis ground (-):
(i88) No. 32 (+) - 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).
Measure the resistance of harness between A/C control panel and chassis ground after turning the ignition switch to OFF.
Connector & terminal
(i88) No. 34 - 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 HVAC SYSTEM (HEATER, VENTILATOR AND A/C)>Control Panel>REMOVAL .
- No : Repair the connector.