Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

NO CD SOUND OUTPUT (ENTERTAINMENT SYSTEM - WITH CENTER DISPLAY) - DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY CD DISC CONDITION Verify the CD disc condition when the malfunction occurred. Is there any dirt or scratches on the CD disc?	Yes	Remove dirt on the CD disc or replace with a CD disc that is not scratched or damaged. Go to Step 10.
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS CD DISC After obtaining the customer's consent, replace with a CD that was not used when the malfunction occurred. Is CD sound produced?	Yes	Go to the next step.
2		No	Go to Step 4.
3	VERIFY IF DATA TYPE OTHER THAN CDDA/MP3/WMA/AAC IS MIXED IN CD DISC Verify the CD disc data content when the malfunction occurred. Is there data other than CDDA/MP3/WMA/AAC data mixed in?	Yes	Replace with a CD disc containing only CDDA/MP3/WMA/AAC data and verify the malfunction symptom. If the malfunction symptom is eliminated System is normal (explain to the customer that the cause was a CD disc containing data other than CDDA/MP3/WMA/AAC). If the malfunction symptom is not eliminated Replace the CD player, then go to Step 10. (See CD PLAYER REMOVAL .) (See CD PLAYER INSTALLATION .)
3		No	Go to the next step.
4	INSPECT CD PLAYER CONNECTOR Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect the CD player 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.
4		No	Repair or replace the connector, then go to Step 10.
5	INSPECT TAU CONNECTOR Disconnect the connectivity master unit 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.
5		No	Repair or replace the connector, then go to Step 10.
6	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN TAU AND CD PLAYER Verify that the CD player and the TAU connector are disconnected. Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side). TAU terminal 1M and CD player terminal L TAU terminal 1N and CD player terminal N TAU terminal 1O and CD player terminal P TAU terminal 1P and CD player terminal R Is there continuity?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. TAU terminal 1M and CD player terminal L TAU terminal 1N and CD player terminal N TAU terminal 1O and CD player terminal P TAU terminal 1P and CD player terminal R 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 10.
7	VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN TAU AND CD PLAYER Verify that the CD player and the TAU connector are disconnected. Inspect for continuity between the following wiring harness terminals (vehicle wiring harness side) and body ground. CD player terminal L CD player terminal N CD player terminal P CD player terminal R Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. TAU terminal 1M and CD player terminal L TAU terminal 1N and CD player terminal N TAU terminal 1O and CD player terminal P TAU terminal 1P and CD player terminal R 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 10.
7		No	Go to the next step.
8	VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO POWER SUPPLY IN WIRING HARNESS BETWEEN TAU AND CD UNIT Verify that the CD player and the TAU connector are disconnected. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition to ACC or ON (engine off or on). Measure the voltage at the following terminals (vehicle wiring harness side). CD player terminal L CD player terminal N CD player terminal P CD player terminal R Is the voltage B+?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. TAU terminal 1M and CD player terminal L TAU terminal 1N and CD player terminal N TAU terminal 1O and CD player terminal P TAU terminal 1P and CD player terminal R If there is a common connector: Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for a short to power supply. 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 10.
8		No	Go to the next step.
9	DETERMINE IF MALFUNCTION CAUSE IS CD PLAYER Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Replace the CD player. (See CD PLAYER REMOVAL .) (See CD PLAYER INSTALLATION .) Connect all the connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition to ACC or ON (engine off or on). Insert the CD disc when the malfunction occurred. Is CD sound produced?	Yes	Go to the next step.
9		No	Replace the CMU, then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .)
10	VERIFY IF MALFUNCTION CAUSE IS CORRECTED Switch the ignition to ACC or ON (engine off or on). Insert the CD disc when the malfunction occurred. Is CD sound produced?	Yes	Troubleshooting completed (explain the contents of the servicing to the customer).
10		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]] .)