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

id0702k3731800

System malfunction location

•  Climate control unit power supply circuit open (IG2)

Detection condition

•  Malfunction in wiring harness between climate control unit and front body control module (FBCM)

Fail-safe function

Not applicable

Possible cause

•  Climate control unit connector malfunction

•  Front body control module (FBCM) connector malfunction

•  Open circuit in wiring harness between the following terminals:

―  Climate control unit terminal X—front body control module (FBCM) terminal 1C

•  Short to ground in wiring harness between the following terminals:

―  Climate control unit terminal X—front body control module (FBCM) terminal 1C

•  Climate control unit malfunction

•  Front body control module (FBCM) malfunction

System malfunction location	• Climate control unit power supply circuit open (IG2)
Detection condition	• Malfunction in wiring harness between climate control unit and front body control module (FBCM)
Fail-safe function	Not applicable
Possible cause	• Climate control unit connector malfunction • Front body control module (FBCM) connector malfunction • Open circuit in wiring harness between the following terminals: ― Climate control unit terminal X—front body control module (FBCM) terminal 1C • Short to ground in wiring harness between the following terminals: ― Climate control unit terminal X—front body control module (FBCM) terminal 1C • Climate control unit malfunction • Front body control module (FBCM) malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION

•  Perform the front body control module (FBCM) DTC inspection using the M-MDS.
(See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)

No

Go to the next step.

2

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL 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

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to Step 7.

3

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE (IG2)

•  Climate control unit connector is disconnected.

•  Connect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

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

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

―  Climate control unit terminal X

•  Is the voltage B+?

Yes

Go to Step 7.

No

Go to the next step.

4

VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Disconnect the front body control module (FBCM) connector.
(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

•  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 Step 7.

5

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR OPEN CIRCUIT

•  Climate control unit and front body control module (FBCM) connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side):

―  Climate control unit terminal X—front body control module (FBCM) terminal 1C

•  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 front body control module (FBCM) 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 Step 7.

6

INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR SHORT TO GROUND

•  Climate control unit and front body control module (FBCM) connectors are disconnected.

•  Inspect for continuity between the following terminal (wiring harness-side) and body ground:

―  Climate control unit terminal X

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front body control module (FBCM) 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 the next step.

No

Go to the next step.

7

VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN

•  Switch the ignition off.

•  Disconnect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Reconnect the disconnected connectors.

•  Connect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL 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.

8

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	PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
1		No	Go to the next step.
2	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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	Go to the next step.
2		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
3	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE (IG2) • Climate control unit connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ― Climate control unit terminal X • Is the voltage B+?	Yes	Go to Step 7.
3		No	Go to the next step.
4	VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front body control module (FBCM) connector. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
4		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
5	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR OPEN CIRCUIT • Climate control unit and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Climate control unit terminal X—front body control module (FBCM) terminal 1C • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front body control module (FBCM) 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 Step 7.
6	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT (IG2) FOR SHORT TO GROUND • Climate control unit and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between the following terminal (wiring harness-side) and body ground: ― Climate control unit terminal X • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and front body control module (FBCM) 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 the next step.
6		No	Go to the next step.
7	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Reconnect the disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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.
7		No	Go to the next step.
8	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)].)
8		No	DTC troubleshooting completed.