DTC U300E:13 [FULL-AUTO AIR CONDITIONER]

id0702c1731800

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

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

INSPECT IG1 RELAY FOR MALFUNCTION

•  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

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  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 CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT

•  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

INSPECT CLIMATE CONTROL UNIT

•  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 [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 THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.
(See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].)

•  Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

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

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT IG1 RELAY FOR MALFUNCTION • 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.
1		No	Replace the IG1 relay, then go to Step 5. (See RELAY LOCATION.)
2	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • 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.
2		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
3	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between climate control unit terminal N and IG1 relay. • Is there continuity?	Yes	Go to the next step.
3		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	INSPECT CLIMATE CONTROL UNIT • 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 [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.
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].) • Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
5		No	DTC troubleshooting completed.