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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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

System malfunction location	U3003:16: Climate control unit power supply circuit voltage below threshold (10 V or less) U3003:17: Climate control unit power supply circuit voltage above threshold (17.3 V or more)
Detection condition	Climate control unit power supply voltage is other than 10—17.3 V
Fail-safe function	Not applicable
Possible cause	Generator system malfunction INTERIOR 15 A, ROOM 25 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 terminal 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 [PCM (SKYACTIV-G 2.0)].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].)
		No	Go to the next step.
2	INSPECT FUSE Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Remove the ROOM 25 A fuse and INTERIOR 15 A fuse. Are the fuses normal?	Yes	Install the ROOM 25 A fuse and INTERIOR 15 A fuse, then go to the next step.
		No	Replace the ROOM 25 A fuse and/or INTERIOR 15 A fuse, then 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 2.0].) (See BATTERY RECHARGING.) Then go to the next step.
4	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION 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	Go to the next step.
		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
5	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND Inspect for continuity between climate control unit terminal L and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal L and battery positive 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 Step 7.
		No	Go to the next step.
6	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between climate control unit terminal L and battery positive terminal. 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 climate control unit terminal L and battery positive 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	INSPECT CLIMATE CONTROL UNIT Reconnect the disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Clear DTCs using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].) Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL 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 [MANUAL AIR CONDITIONER].) Go to the next step.
		No	Go to the next step.
8	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. (See DTC DISPLAY [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].) Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)
		No	DTC troubleshooting completed.

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