DTC U3003:16, U3003:17 [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)]

id0702k3731000

System malfunction location	•  U3003:16: Climate control unit power supply circuit voltage below threshold (10.00 V or less) •  U3003:17: Climate control unit power supply circuit voltage above threshold (17.30 V or more)
Detection condition	•  Climate control unit power supply voltage is other than 10.01—17.29 V
Fail-safe function	Not applicable
Possible cause	•  DTCs are stored in the PCM. •  DTCs are stored in the DC-DC converter (i-ELOOP). ―  DC-DC converter (i-ELOOP) connector or terminal malfunction ―  DC-DC converter (i-ELOOP) malfunction •  Battery malfunction •  Generator system malfunction •  Climate control unit connector malfunction •  Climate control unit power supply circuit malfunction Without i-ELOOP: ―  Short to ground in the wiring harness between MAIN 200 A fuse and climate control unit terminal F ―  Short to ground in the wiring harness between MAIN 200 A fuse and climate control unit terminal D ―  INTERIOR 15 A fuse malfunction ―  ROOM 25 A fuse malfunction ―  MAIN 200 A fuse malfunction ―  IG1 relay malfunction ―  C/U IG1 15 A fuse malfunction ―  Open circuit in the wiring harness between battery positive terminal and climate control unit terminal F ―  Open circuit in the wiring harness between battery positive terminal and climate control unit terminal D With i-ELOOP: ―  Short to ground in the wiring harness between ROOM 25 A fuse and climate control unit terminal F ―  Short to ground in the wiring harness between ROOM 25 A fuse and climate control unit terminal D ―  INTERIOR 15 A fuse malfunction ―  ROOM 25 A fuse malfunction ―  IG1 relay malfunction ―  C/U IG1 15 A fuse malfunction ―  Open circuit in the wiring harness between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal F ―  Open circuit in the wiring harness between DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D •  Climate control unit malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT IG1 RELAY •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Remove the IG1 relay. (See RELAY LOCATION.) •  Inspect the IG1 relay. (See RELAY INSPECTION.) •  Is the IG1 relay normal?	Yes	Go to the next step.
		No	Replace the IG1relay, then go to Step 11.
2	INSPECT PCM DTC •  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 1.5)].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See DTC TABLE [PCM (SKYACTIV-D 1.5)].)
		No	Without i-ELOOP: •  Go to Step 4. With i-ELOOP: •  Go to the next step.
3	INSPECT DC-DC CONVERTER (i-ELOOP) DTC •  Perform the DC-DC converter (i-ELOOP) DTC inspection using the M-MDS. (See DTC INSPECTION [i-ELOOP].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [i-ELOOP].)
		No	Go to the next step.
4	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 1.3, SKYACTIV-G 1.5].) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) (See BATTERY RECHARGING.) Then go to Step 11.
5	INSPECT GENERATOR •  Inspect the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-D 1.5)].) (See GENERATOR INSPECTION [WITH i-ELOOP (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See GENERATOR INSPECTION [WITH i-ELOOP (SKYACTIV-D 1.5)].) •  Is the generator normal?	Yes	Go to the next step.
		No	Replace the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-D 1.5)].) (See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-G 1.3, SKYACTIV-G 1.5)].) (See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-D 1.5)].) Then go to the Step 11.
6	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE 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	Without i-ELOOP: •  Go to the next step. With i-ELOOP: •  Go to Step 9.
		No	Repair/replace the connector or terminal. After repair procedure, go to Step 11.
7	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE •  Climate control unit connector is disconnected. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition on (engine off or on). •  Measure the voltage at the following terminal (wiring harness-side): ―  Climate control unit terminal F •  Is the voltage 10.01—17.29?	Yes	Go to the next step.
		No	Inspect the INTERIOR 15 A fuse, ROOM 25 A fuse and MAIN 200 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and climate control unit terminal F. 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 battery positive terminal and climate control unit terminal F. 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 11.
8	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE •  Measure the voltage at the following terminal (wiring harness-side): ―  Climate control unit terminal D •  Is the voltage 10.01—17.29?	Yes	Go to Step 11.
		No	Inspect the C/U IG1 15 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and climate control unit terminal D. 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 battery positive terminal and climate control unit terminal D. 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 11.
9	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE •  Climate control unit connector is disconnected. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition on (engine off or on). •  Measure the voltage at the following terminal (wiring harness-side): ―  Climate control unit terminal F •  Is the voltage 10.01—17.29?	Yes	Go to the next step.
		No	Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Inspect the INTERIOR 15 A fuse and ROOM 25 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between ROOM 25 A fuse and climate control unit terminal F. If there is a common connector: •  Determine the malfunctioning location by inspecting the common connector and terminals for corrosion, damage, or disconnection and by inspecting the DC-DC converter (i-ELOOP) terminal 4A-related 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 is shorted to ground, or the DC-DC converter (i-ELOOP) terminal 4A-related wiring harness. ―  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 DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal F. 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. Connect the service plug, then go Step 11. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
10	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY VOLTAGE •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Measure the voltage at the following terminal (wiring harness-side): ―  Climate control unit terminal D •  Is the voltage 10.01—17.29?	Yes	Go to the next step.
		No	Disconnect the service plug. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].) Inspect the C/U IG1 15 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and climate control unit terminal D. If there is a common connector: •  Determine the malfunctioning location by inspecting the common connector and terminals for corrosion, damage, or disconnection and by inspecting the DC-DC converter (i-ELOOP) terminal 4A-related 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 is shorted to ground, or the DC-DC converter (i-ELOOP) terminal 4A-related wiring harness. ―  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 DC-DC converter (i-ELOOP) terminal 4A and climate control unit terminal D. 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. Connect the service plug, then go to the next step. (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)
11	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Reconnect the disconnected connectors. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE 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.
12	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.