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

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DTC U300E:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

System malfunction location	Climate control unit power supply circuit open (IG1)
Detection condition	Malfunction in wiring harness between climate control unit and IG1 relay
Fail-safe function	Not applicable
Possible cause	IG1 relay malfunction Climate control unit connector malfunction Open circuit in wiring harness between battery positive terminal and climate control unit terminal Climate control unit malfunction

Step	Inspection		Action
1	INSPECT IG1 RELAY FOR MALFUNCTION 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 IG1 relay, then go to Step 5. (See RELAY LOCATION.)
2	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO 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.
3	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between climate control unit terminal N and IG1 relay. 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 and IG1 relay. 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.
4	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. Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Are DTCs U300E:13 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.
5	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	DTC troubleshooting completed.

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