DTC U300F:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)] - MAZDA CX-9 TC 2016

DTC U300F:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

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Note

• There are two types of front climate control unit, type A and type B.

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Front Climate Control Unit Type A

System malfunction location	• Front climate control unit power supply circuit open (IG2)
Detection condition	• Front climate control unit detects the difference between IG2 signal and CAN signal
Fail-safe function	Not applicable
Possible cause	• Front climate control unit connector malfunction • Front body control module (FBCM) connector malfunction • Open circuit in wiring harness between front body control module (FBCM) terminal and front climate control unit terminal • Front climate control unit malfunction • Front body control module (FBCM) malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED DTC • Switch the ignition off. • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is DTC U0423:68 also present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	PERFORM INSTRUMENT CLUSTER DTC INSPECTION • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
2		No	Go to the next step.
3	PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
3		No	Go to the next step.
4	VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
4		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
5	VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Disconnect the front body control module connector. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
5		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
6	INSPECT IG2 CIRCUIT (BETWEEN FRONT CLIMATE CONTROL UNIT AND FRONT BODY CONTROL MODULE (FBCM)) FOR OPEN CIRCUIT • Front climate control unit and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ? Front climate control unit terminal 1B—front body control module (FBCM) terminal 1C • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front body control module (FBCM) 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	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • Reconnect the disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the front climate control unit. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	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 (FULL-AUTO AIR CONDITIONER)].)
8		No	DTC troubleshooting completed.

Front Climate Control Unit Type B

System malfunction location	• Front climate control unit power supply circuit open (IG2)
Detection condition	• Front climate control unit detects the difference between IG2 signal and CAN signal
Fail-safe function	Not applicable
Possible cause	• Front climate control unit connector malfunction • Front body control module (FBCM) connector malfunction • Open circuit in wiring harness between front body control module (FBCM) terminal and front climate control unit terminal • Front climate control unit malfunction • Front body control module (FBCM) malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED DTC • Switch the ignition off. • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is DTC U0423:68 also present?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	PERFORM INSTRUMENT CLUSTER DTC INSPECTION • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
2		No	Go to the next step.
3	PERFORM FRONT BODY CONTROL MODULE (FBCM) DTC INSPECTION • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
3		No	Go to the next step.
4	VERIFY FRONT CLIMATE CONTROL UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front climate control unit connector. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
4		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
5	VERIFY FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Disconnect the front body control module connector. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Are the connector and terminals normal?	Yes	Go to the next step.
5		No	Repair/replace the connector or terminal. After repair procedure, go to Step 7.
6	INSPECT IG2 CIRCUIT (BETWEEN FRONT CLIMATE CONTROL UNIT AND FRONT BODY CONTROL MODULE (FBCM)) FOR OPEN CIRCUIT • Front climate control unit and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ? Front climate control unit terminal 1N—front body control module (FBCM) terminal 1C • Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between front climate control unit terminal and front body control module (FBCM) 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	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN • Reconnect the disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the front climate control unit. (See FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	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 (FULL-AUTO AIR CONDITIONER)].)
8		No	DTC troubleshooting completed.