DTC U3003:16, U3003:17 [FULL-AUTO AIR CONDITIONER]

id0702c1731000

System malfunction location	•  U3003:16: Climate control unit power supply circuit voltage below threshold (B+, IG1) (10 V or less) •  U3003:17: Climate control unit power supply circuit voltage above threshold (B+, IG1) (17.3 V or more)
Detection condition	•  Climate control unit power supply voltage is other than 10.1—17.2 V
Fail-safe	—
Possible cause	•  Generator system malfunction •  ROOM 15 A fuse malfunction •  Battery malfunction •  Climate control unit connector malfunction •  Open or short circuit to ground in wiring harness between battery positive terminal and climate control unit •  Climate control unit malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	INSPECT PCM DTC (INSPECT GENERATOR CIRCUIT) •  Switch the ignition off. •  Connect the M-MDS to the DLC-2. •  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 2.2].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See DTC TABLE [SKYACTIV-D 2.2].)
		No	Go to the next step.
2	INSPECT FUSE •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Remove the ROOM 15 A fuse. •  Is the fuse normal?	Yes	Install the ROOM 15 A fuse, then go to the next step.
		No	Replace the ROOM 15 A fuse, then go to Step 8.
3	INSPECT BATTERY •  Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See BATTERY INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See BATTERY INSPECTION [SKYACTIV-D 2.2].) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace/charge the battery, then go to Step 8.
4	INSPECT CLIMATE CONTROL UNIT •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Switch the ignition ON (engine off or on). •  Inspect the climate control unit terminal 1E. •  Is voltage normal?	Yes	The system is normal at present. Go to the step 8.
		No	Go to the next step.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Disconnect the climate control unit connector. •  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 the next step.
6	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND •  Disconnect the climate control unit connector. •  Inspect for continuity between climate control unit terminal 1E and body ground. •  Is there continuity?	Yes	Repair the wiring harness, then go to Step 8.
		No	Go to the next step.
7	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT •  Inspect for continuity between climate control unit terminal 1E and battery positive terminal. •  Is there continuity?	Yes	Go to the next step.
		No	Repair the wiring harness, then go to the next step.
8	INSPECT CLIMATE CONTROL UNIT •  Reconnect the disconnected connectors. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) •  Clear DTCs using the M-MDS. •  Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].) •  Are DTCs U3003:16 or U3003:17 displayed?	Yes	Repeat the inspection from Step 1. •  If the malfunction does not recur, go to the next step. •  If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCs ARE PRESENT •  Verify other DTCs displayed. •  Are any other DTCs output?	Yes	Perform the corresponding DTC inspection.
		No	DTC troubleshooting completed.