System malfunction location

• Climate control unit power supply circuit open (IG1)

Detection condition

• Malfunction in wiring harness between climate control unit and IG1 relay

Fail-safe function

Not applicable

Possible cause

• IG1 relay malfunction

• Climate control unit connector malfunction

• Open circuit in wiring harness between battery positive terminal and climate control unit terminal

• Climate control unit malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Remove the IG1 relay.

  (See RELAY LOCATION.)

• Inspect the IG1 relay.

  (See RELAY INSPECTION.)

• Is the IG1 relay normal?

Yes

Go to the next step.

No

Replace the IG1 relay, then go to Step 5.

(See RELAY LOCATION.)

2

• Disconnect the climate control unit connector.

  (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

• Inspect the connector and terminals (corrosion, damage, pin disconnection).

• Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to the next step.

3

• Inspect for continuity between climate control unit terminal N and IG1 relay.

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and IG1 relay.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to the next step.

4

• Reconnect the disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear DTCs using the M-MDS.

• Perform the climate control unit DTC inspection using the M-MDS.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

• Are DTCs U300E:13 displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction does not recur, go to the next step.

• If the malfunction recurs, replace the climate control unit.

  (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

5

• Verify other DTCs displayed.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

• Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.