DTC B1143:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2900200

System malfunction location

•  Rear climate control unit power supply circuit open (IG2)

Detection condition

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

Fail-safe function

Not applicable

Possible cause

•  Rear climate control unit connector or terminal malfunction

•  Rear climate control unit malfunction

•  Front body control module (FBCM) connector or terminal malfunction

•  Front body control module (FBCM) malfunction

•  Open circuit in the wiring harness between the following terminals:

―  Rear climate control unit terminal B—front body control module (FBCM) terminal 1C

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

―  Rear climate control unit terminal B—front body control module (FBCM) terminal 1C

―  Front climate control unit terminal 1N—front body control module (FBCM) terminal 1C

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

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION

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

•  Disconnect the rear climate control unit connector.
(See REAR CLIMATE CONTROL UNIT 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 5.

2

VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION

•  Disconnect the front body control module 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 5.

3

INSPECT REAR CLIMATE CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT

•  Rear climate control unit and front body control module (FBCM) connecters are disconnected.

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

―  Rear climate control unit terminal B—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 rear 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 the next step.

4

INSPECT REAR CLIMATE CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT CIRCUIT TO BODY GROUND

•  Rear climate control unit and front body control module (FBCM) connecters are disconnected.

•  Disconnect the front climate control unit connecters.
(See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

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

―  Front body control module (FBCM) terminal 1C

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between rear 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.

5

VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN

•  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 (FULL-AUTO AIR CONDITIONER)].)

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

•  Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the rear climate control unit.
(See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

6

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 (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.

STEP	INSPECTION		ACTION
1	VERIFY REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the rear climate control unit connector. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
1		No	Repair/replace the connector or terminal. After repair procedure, go to Step 5.
2	VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Disconnect the front body control module 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.
2		No	Repair/replace the connector or terminal. After repair procedure, go to Step 5.
3	INSPECT REAR CLIMATE CONTROL UNIT CIRCUIT FOR OPEN CIRCUIT • Rear climate control unit and front body control module (FBCM) connecters are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Rear climate control unit terminal B—front body control module (FBCM) terminal 1C • 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 rear 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 the next step.
4	INSPECT REAR CLIMATE CONTROL UNIT AND FRONT CLIMATE CONTROL UNIT CIRCUIT FOR SHORT CIRCUIT TO BODY GROUND • Rear climate control unit and front body control module (FBCM) connecters are disconnected. • Disconnect the front climate control unit connecters. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect for continuity between the body ground and following terminals (wiring harness-side): ― Front body control module (FBCM) terminal 1C • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between rear 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.
4		No	Go to the next step.
5	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • 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 (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear climate control unit. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next step.
5		No	Go to the next step.
6	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 (FULL-AUTO AIR CONDITIONER)].)
6		No	DTC troubleshooting completed.