Diagnostic Procedure

WARNING: This page is about a different car, the 2018 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The malfunction may be caused by a non-genuine, after-market electrical component. If a non-genuine, after-market electrical component has been installed and it cannot be determined whether the malfunction cause is due to the non-genuine, after-market electrical component or not, more time may be required to perform the malfunction diagnosis. (See FORWARD (ENTERTAINMENT SYSTEM) .)

IMAGE NOT OUTPUT IN ALL MODES (ENTERTAINMENT SYSTEM) DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	VERIFY AFTER-MARKET ELECTRICAL COMPONENT INSTALLATION CONDITION Verify if a non-genuine, after-market electrical component is installed. Has a non-genuine, after-market electrical component been installed?	Yes	Go to the next step.
1		No	Go to Step 3.
2	VERIFY IF MALFUNCTION CAUSE IS AFTER-MARKET ELECTRICAL COMPONENT INSTALLATION Disconnect the non-genuine, after-market electrical component connectors. Verify if the malfunction symptom recurs as stated by the customer. Does the malfunction recur?	Yes	Go to the next step.
2		No	Explain to the customer that the malfunction occurred due to the after-market electrical component installation.
3	INSPECT CENTER DISPLAY CONNECTOR Switch the ignition off. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Disconnect the center display 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.
3		No	Repair or replace the connector, then go to Step 7.
4	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.
4		No	Repair or replace the connector, then go to Step 7.
5	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN CENTER DISPLAY AND BODY GROUND Verify that the center display connector is disconnected. Inspect the wiring harness for continuity between center display terminal 1B and body ground (vehicle wiring harness side). Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify if there is a common connector between center display terminal 1B and body ground. 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 7.
6	VERIFY IF MALFUNCTION CAUSE IS CENTER DISPLAY Replace the center display. (See CENTER DISPLAY REMOVAL/INSTALLATION .) Connect all the connectors. Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Switch the ignition to ACC or ON (engine off or on). Is image output in the center display?	Yes	Go to the next step.
6		No	Replace the CMU, then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION .)
7	VERIFY IF MALFUNCTION CAUSE IS CORRECTED Switch the ignition to ACC or ON (engine off or on). Select each mode by operating the center display or the commander switch. Is image in each mode output?	Yes	Troubleshooting completed (explain the contents of the servicing to the customer).
7		No	Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis. (See SYMPTOM TROUBLESHOOTING (ENTERTAINMENT SYSTEM) .)