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

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NO USB AUDIO SOUND OUTPUT [ENTERTAINMENT SYSTEM [WITH CENTER DISPLAY]]

Description	NO USB AUDIO SOUND OUTPUT
Description	Radio, CD, AUX audio, Bluetooth^® audio, Internet radio, and guidance audio is output, but not USB audio
Possible Causes	USB device malfunction Connector poor contact or terminal damage Open circuit in wiring harness between the following terminals: Connectivity master unit (CMU) terminal 4A and auxiliary jack/USB port/SD card slot hub terminal 2A Short to ground in wiring harness between the following terminals: CMU terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B CMU terminal 4D and auxiliary jack/USB port/SD card slot hub terminal 2D Short to power supply in wiring harness between the following terminals: CMU terminal 4A and auxiliary jack/USB port/SD card slot hub terminal 2A CMU terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B CMU terminal 4D and auxiliary jack/USB port/SD card slot hub terminal 2D Auxiliary jack/USB port/SD card slot hub malfunction CMU malfunction
System Wiring Diagram

Diagnostic Procedure

Step	Inspection		Action
1	DETERMINE IF MALFUNCTION CAUSE IS USB DEVICE Switch the ignition off. After obtaining the customer's consent, replace with a USB device that was not used when the malfunction occurred. Switch the ignition to ACC or ON (engine off or on). Select the USB audio mode by operating the commander switch or the center display. Is sound from the USB audio output?	Yes	System is normal. (Explain to the customer that the USB device or internal data has a malfunction)
		No	Go to the next step.
2	INSPECT AUXILIARY JACK/USB PORT/SD CARD SLOT HUB CONNECTOR Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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.
		No	Repair or replace the connector, then go to Step 8.
3	INSPECT CMU CONNECTOR Disconnect the 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.
		No	Repair or replace the connector, then go to Step 8.
4	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN CMU AND AUXILIARY JACK/USB PORT/SD CARD SLOT HUB Verify that the CMU and the auxiliary jack/USB port/SD card slot hub connector are disconnected. Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side). CMU terminal 4A and auxiliary jack/USB port/SD card slot hub terminal 2A Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. CMU terminal 4A and auxiliary jack/USB port/SD card slot hub terminal 2A 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 8.
5	VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN CMU AND AUXILIARY JACK/USB PORT/SD CARD SLOT HUB Verify that the CMU and the auxiliary jack/USB port/SD card slot hub connector are disconnected. Inspect for continuity between the following wiring harness terminals (vehicle wiring harness side) and body ground. Auxiliary jack/USB port/SD card slot hub terminal 2B Auxiliary jack/USB port/SD card slot hub terminal 2D Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. CMU terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B 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 short to ground to determine the malfunctioning location. Repair or replace the malfunctioning location. If there is no common connector: Repair or replace the wiring harness which is shorted to ground. Go to Step 8.
		No	Go to the next step.
6	VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO POWER SUPPLY IN WIRING HARNESS BETWEEN CMU AND AUXILIARY JACK/USB PORT/SD CARD SLOT HUB Verify that the CMU and the auxiliary jack/USB port/SD card slot hub connector are disconnected. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition to ACC or ON (engine off or on). Measure the voltage at the following terminals (vehicle wiring harness side). Auxiliary jack/USB port/SD card slot hub terminal 2A Auxiliary jack/USB port/SD card slot hub terminal 2B Auxiliary jack/USB port/SD card slot hub terminal 2D Is the voltage B+?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. CMU terminal 4A and auxiliary jack/USB port/SD card slot hub terminal 2A CMU terminal 4B and auxiliary jack/USB port/SD card slot hub terminal 2B 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 short to power supply to determine the malfunctioning location. Repair or replace the malfunctioning location. If there is no common connector: Repair or replace the wiring harness which is shorted to the power supply. Go to Step 8.
		No	Go to the next step.
7	VERIFY IF MALFUNCTION CAUSE IS AUXILIARY JACK/USB PORT/SD CARD SLOT HUB Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Replace the auxiliary jack/USB port/SD card slot hub. (See AUXILIARY JACK/USB PORT/SD CARD SLOT HUB REMOVAL/INSTALLATION.) Connect all the connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Insert the USB disc when the malfunction occurred. Switch the ignition to ACC or ON (engine off or on). Select the USB audio mode by operating the commander switch or the center display. Is sound from the USB audio output?	Yes	Troubleshooting completed. (Explain the contents of the servicing to the customer.)
		No	Replace the CMU, then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)
8	VERIFY IF MALFUNCTION CAUSE IS CORRECTED Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Connect all the connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Insert the USB disc when the malfunction occurred. Switch the ignition to ACC or ON (engine off or on). Select the USB audio mode by operating the commander switch or the center display. Is sound from the USB audio output?	Yes	Troubleshooting completed. (Explain the contents of the servicing to the customer.)
		No	Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis. (See SYMPTOM TROUBLESHOOTING [ENTERTAINMENT SYSTEM [WITH CENTER DISPLAY]].)

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