HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostics for A/C System Malfunction

A/C OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE

TROUBLE SYMPTOM:

• Set temperature is not indicated on the display, switch LEDs are faulty and switches do not operate.

• Self-diagnosis system does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK FUSE.

1) Turn the ignition switch to OFF.

2) Remove the fuse No. 7 from fuse & relay box.

3) Check the condition of fuse.

Is the fuse blown out?

Replace the fuse.

2.CHECK FUSE.

1) Turn the ignition switch to OFF.

2) Remove the fuse No. 22 and No. 31 from fuse & relay box.

3) Check the condition of fuse.

Is the fuse blown out?

Replace the fuse.

3.CHECK A/C CONTROL UNIT POWER CIRCUIT.

1) Remove the A/C control panel.

2) Disconnect the A/C control panel harness connector.

3) Measure the voltage between A/C control panel harness connector terminal and chassis ground after turning the ignition switch to ACC.

Connector & terminal

(i88) No. 15 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Check for open or short circuit in the harness between A/C control panel and fuse.

4.CHECK A/C CONTROL UNIT POWER CIRCUIT.

Measure the voltage between A/C control panel harness connector terminal and chassis ground after turning the ignition switch to ON.

Connector & terminal

(i88) No. 32 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Check for open or short circuit in the harness between A/C control panel and fuse.

5.CHECK A/C CONTROL PANEL GROUND POWER CIRCUIT.

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?

Repair the harness for ground line.

6.CHECK POOR CONTACT.

Check poor contact of auto A/C control module connector.

Is there poor contact of connector?

Repair the connector.

Replace the auto A/C control module.