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	• Rear climate control unit detects the difference between IG2 signal and LIN signal
Fail-safe function	Not applicable
Possible cause	• Rear climate control unit connector malfunction • Front body control module (FBCM) connector malfunction • Open circuit in wiring harness between front body control module (FBCM) terminal and rear climate control unit terminal • Front climate control unit malfunction • Rear climate control unit malfunction • Front body control module (FBCM) malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED DTC • Switch the ignition off. • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is DTC U0424:68 also present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC U0424:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	PERFORM INSTRUMENT CLUSTER DTC INSPECTION • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
2		No	Go to the next step.
3	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)].)
3		No	Go to the next step.
4	VERIFY REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • 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.
4		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
5	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.
5		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
6	INSPECT IG2 CIRCUIT (BETWEEN REAR CLIMATE CONTROL UNIT AND FRONT BODY CONTROL MODULE (FBCM)) FOR OPEN CIRCUIT • Rear climate control unit and front body control module (FBCM) connectors 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.
6		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.
7	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.
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 (FULL-AUTO AIR CONDITIONER)].)
8		No	DTC troubleshooting completed.