Diagnostic procedure

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

STEP	INSPECTION		ACTION
1	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] .) Remove the C/U IG1 15 A fuse. Is the fuse normal?	Yes	Install the C/U IG1 15 A fuse, then go to the next step.
1		No	Replace the C/U IG1 15 A fuse, then go to Step 4.
2	INSPECT IG1 RELAY FOR MALFUNCTION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) 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.
2		No	Replace the IG1 relay, then go to Step 4. (See RELAY LOCATION .)
3	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.
3		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
4	INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between climate control unit terminal 1C and C/U IG1 15 A fuse. Is there continuity?	Yes	Go to the next step.
4		No	Repair or replace the wiring harness which has an open circuit. Go to the next step.
5	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] .) 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 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.
5		No	Go to the next step.
6	VERIFY THAT NO OTHER DTCs ARE PRESENT Verify other DTCs displayed. (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER] .) Are any other DTCs output?	Yes	Perform the corresponding DTC inspection. (See DTC TABLE [FULL-AUTO AIR CONDITIONER] .)
6		No	DTC troubleshooting completed.