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 AUXILIARY JACK/USB PORT/SD CARD SLOT HUB CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect the auxiliary jack/USB port/SD card slot hub connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 5.
2	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR CONDITION Disconnect the connectivity master unit (CMU) connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 5.
3	INSPECT AUXILIARY JACK/USB PORT/SD CARD SLOT HUB CIRCUIT FOR OPEN CIRCUIT Verify that the auxiliary jack/USB port/SD card slot hub connector and the connectivity master unit (CMU) connector are disconnected. Inspect the wiring harness for continuity between the following terminals (wiring harness-side). Connectivity master unit (CMU) terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B Connectivity master unit (CMU) terminal 4D and auxiliary jack/USB port/SD card slot hub terminal 2D Is there continuity?	Yes	Go to the next step.
3		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. Connectivity master unit (CMU) terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B Connectivity master unit (CMU) terminal 4D and auxiliary jack/USB port/SD card slot hub terminal 2D If there is a common connector: Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. Repair or replace the malfunctioning location. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 5.
4	VERIFY IF MALFUNCTIONING LOCATION IS AUXILIARY JACK/USB PORT/SD CARD SLOT HUB DEPENDING ON REPEATABILITY Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT] .) Switch the ignition ON (engine off or on) and wait for 7 s or more . Retrieve the connectivity master unit (CMU) DTCs using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT] .) Is the same DTC displayed?	Yes	Replace the auxiliary jack/USB port/SD card slot hub, then go to the next step. (See AUXILIARY JACK/USB PORT/SD CARD SLOT HUB REMOVAL/INSTALLATION .)
4		No	Go to Step 6.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT] .) Switch the ignition ON (engine off or on) and wait for 7 s or more . Retrieve the connectivity master unit (CMU) DTCs using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT] .) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the connectivity master unit (CMU). (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .) Go to the next step.
5		No	Go to the next step.
6	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
6		No	DTC troubleshooting completed.