System malfunction location

• U3003:16: Climate control unit power supply circuit voltage below threshold (10 V or less)

• U3003:17: Climate control unit power supply circuit voltage above threshold (17.3 V or more)

Detection condition

• Climate control unit power supply voltage is other than 10—17.3 V

Fail-safe function

Not applicable

Possible cause

• Generator system malfunction

• INTERIOR 15 A, ROOM 25 A fuse malfunction

• Battery malfunction

• Climate control unit connector malfunction

• Open or short circuit to ground in wiring harness between battery positive terminal and climate control unit terminal

• Climate control unit malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Connect the M-MDS to the DLC-2.

• Perform the PCM DTC inspection using the M-MDS.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

2

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Remove the ROOM 25 A fuse and INTERIOR 15 A fuse.

• Are the fuses normal?

Yes

Install the ROOM 25 A fuse and INTERIOR 15 A fuse, then go to the next step.

No

Replace the ROOM 25 A fuse and/or INTERIOR 15 A fuse, then go to the next step.

3

• Inspect the battery.

  (See BATTERY INSPECTION.)

• Is the battery normal?

Yes

Go to the next step.

No

Replace or charge the battery.

(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

(See BATTERY RECHARGING.)

Then go to the next step.

4

• 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.

5

• Inspect for continuity between climate control unit terminal L and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal 1B and battery positive terminal.

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 a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 7.

No

Go to the next step.

6

• Inspect for continuity between climate control unit terminal L and battery positive terminal.

• 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 1B and battery positive terminal.

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.

7

• Reconnect the disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear DTCs using the M-MDS.

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

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

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

• Are DTCs U3003:16 or U3003:17 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.

8

• 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.