DTC B1142:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2900100

System malfunction location	•  Rear climate control unit power supply circuit open (IG1)
Detection condition	•  Malfunction in wiring harness between DC-DC converter and rear climate control unit
Fail-safe function	Not applicable
Possible cause	•  DTCs stored in PCM. ―  DC-DC converter connector or terminal malfunction ―  DC-DC converter malfunction •  IG1 relay malfunction •  Battery malfunction •  Generator system malfunction •  Rear climate control unit connector or terminal malfunction •  Rear climate control unit malfunction •  Open circuit in the wiring harness between the following terminals: ―  Rear climate control unit terminal X—DC-DC converter terminal K •  Short circuit to body ground in the wiring harness between the following terminals: ―  Rear climate control unit terminal X—METER2 7.5 A fuse ―  Front climate control unit terminal 1W—METER2 7.5 A fuse

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT IGNITION RELAY (IG1_STAB) FOR MALFUNCTION •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Remove the IGNITION relay (IG1_STAB). (See RELAY LOCATION.) •  Inspect the IGNITION relay (IG1_STAB). (See RELAY INSPECTION.) •  Is the IGNITION relay (IG1_STAB) normal?	Yes	Go to the next step.
		No	Replace the IGNITION relay (IG1_STAB). (See RELAY LOCATION.) Then go to Step 7.
2	PERFORM PCM DTC INSPECTION •  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5)].) (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
		No	Go to the next step.
3	INSPECT BATTERY •  Inspect the battery. (See BATTERY INSPECTION.) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace or charge the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) (See BATTERY RECHARGING.) Then go to Step 7.
4	INSPECT GENERATOR •  Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.5].) (See GENERATOR INSPECTION [SKYACTIV-D 2.2].) •  Is the generator normal?	Yes	Go to the next step.
		No	Replace or charge the generator. (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) (See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Then go to Step 7.
5	VERIFY REAR CLIMATE CONTROL UNIT CONNECTOR CONDITION •  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 7.
6	INSPECT REAR CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE •  Rear climate control unit connecter 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 terminal (wiring harness-side): ―  Rear climate control unit terminal X •  Is the voltage B+?	Yes	Go to the next step.
		No	Inspect the METER2 7.5 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminal. •  Rear climate control unit terminal X—METER2 7.5 A fuse •  Front climate control unit terminal 1W—METER2 7.5 A fuse 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 rear climate control unit terminal and DC-DC converter terminal K. 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. Then 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.
		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)].)
		No	DTC troubleshooting completed.