DTC U300E:13 [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)]

id0702k3731800

System malfunction location

•  Climate control unit power supply circuit open (IG1)

Detection condition

•  Malfunction in climate control unit power supply circuit (IG1)

Fail-safe function

Not applicable

Possible cause

•  IG1 relay malfunction

•  DTCs are stored in the start stop unit.

•  Climate control unit connector malfunction

•  Climate control unit power supply circuit malfunction

Without i-ELOOP:

―  Short to ground in the wiring harness between MAIN 200 A fuse and climate control unit terminal D

―  C/U IG1 15 A fuse malfunction

―  Open circuit in the wiring harness between battery positive terminal and climate control unit terminal D

With i-ELOOP:

―  Short to ground in the wiring harness between C/U IG1 15 A fuse and climate control unit terminal D

―  C/U IG1 15 A fuse malfunction

―  Open circuit in the wiring harness between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D

•  Climate control unit malfunction

System malfunction location	• Climate control unit power supply circuit open (IG1)
Detection condition	• Malfunction in climate control unit power supply circuit (IG1)
Fail-safe function	Not applicable
Possible cause	• IG1 relay malfunction • DTCs are stored in the start stop unit. • Climate control unit connector malfunction • Climate control unit power supply circuit malfunction Without i-ELOOP: ― Short to ground in the wiring harness between MAIN 200 A fuse and climate control unit terminal D ― C/U IG1 15 A fuse malfunction ― Open circuit in the wiring harness between battery positive terminal and climate control unit terminal D With i-ELOOP: ― Short to ground in the wiring harness between C/U IG1 15 A fuse and climate control unit terminal D ― C/U IG1 15 A fuse malfunction ― Open circuit in the wiring harness between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D • Climate control unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT IG1 RELAY

•  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 IG1relay, then go to Step 6.

2

INSPECT START STOP UNIT DTC

•  Perform the start stop unit DTC inspection using the M-MDS.
(See DTC INSPECTION [START STOP UNIT].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [START STOP UNIT].)

No

Go to the next step.

3

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Disconnect the climate control unit connector.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

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

•  Are the connector and terminals normal?

Yes

Without i-ELOOP:

•  Go to the next step.

With i-ELOOP:

•  Go to Step 5.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 6.

4

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE

•  Climate control unit connector is disconnected.

•  Connect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Switch the ignition on (engine off or on).

•  Measure the voltage at the following terminal (wiring harness-side):

―  Climate control unit terminal D

•  Is the voltage 0 V?

Yes

Inspect the MAIN 200 A fuse and C/U IG1 15 A fuse.

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and climate control unit terminal D.

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.

―  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

•  If the fuse is normal:

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

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 Step 6.

No

Go to Step 6.

5

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE

•  Climate control unit connector is disconnected.

•  Connect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Switch the ignition on (engine off or on).

•  Measure the voltage at the following terminal (wiring harness-side):

―  Climate control unit terminal D

•  Is the voltage 0 V?

Yes

Disconnect the service plug.

(See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)

Inspect the C/U IG1 15 A fuse.

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and climate control unit terminal D.

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.

―  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

•  If the fuse is normal:

―  Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D.

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.

Connect the service plug, then go to the next step.

(See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)

No

Go to the next step.

6

VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN

•  Switch the ignition off.

•  Disconnect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Reconnect the disconnected connectors.

•  Connect the negative battery cable.
(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

•  Clear the DTC from the climate control unit memory using the M-MDS.
(See CLEARING DTC [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

•  Perform the DTC inspection for the climate control unit using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

•  Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the climate control unit.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

7

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.

•  Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

No

DTC troubleshooting completed.

STEP	INSPECTION		ACTION
1	INSPECT IG1 RELAY • 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 IG1relay, then go to Step 6.
2	INSPECT START STOP UNIT DTC • Perform the start stop unit DTC inspection using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [START STOP UNIT].)
2		No	Go to the next step.
3	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Without i-ELOOP: • Go to the next step. With i-ELOOP: • Go to Step 5.
3		No	Repair/replace the connector or terminal. After repair procedure, go to Step 6.
4	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE • Climate control unit connector is disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Switch the ignition on (engine off or on). • Measure the voltage at the following terminal (wiring harness-side): ― Climate control unit terminal D • Is the voltage 0 V?	Yes	Inspect the MAIN 200 A fuse and C/U IG1 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and climate control unit terminal D. 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. ― Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and climate control unit terminal D. 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 Step 6.
4		No	Go to Step 6.
5	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE • Climate control unit connector is disconnected. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Switch the ignition on (engine off or on). • Measure the voltage at the following terminal (wiring harness-side): ― Climate control unit terminal D • Is the voltage 0 V?	Yes	Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Inspect the C/U IG1 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and climate control unit terminal D. 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. ― Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D. 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. Connect the service plug, then go to the next step. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
5		No	Go to the next step.
6	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Reconnect the disconnected connectors. • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) Go to the next step.
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)
7		No	DTC troubleshooting completed.