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

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IMAGE NOT OUTPUT IN ALL MODES [ENTERTAINMENT SYSTEM [WITH CENTER DISPLAY]]

Description	IMAGE NOT OUTPUT IN ALL MODES
Description	Image is not output in center display even if any mode is selected
Possible Causes	Connector poor contact or terminal damage Open circuit in wiring harness between center display terminal 1B and body ground Center display malfunction Connectivity master unit (CMU) malfunction
System Wiring Diagram

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT CENTER DISPLAY CONNECTOR Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE 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.
		No	Repair or replace the connector, then go to Step 5.
2	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 5.
3	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.
		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 5.
4	VERIFY IF MALFUNCTION CAUSE IS CENTER DISPLAY Replace the center display. (See CENTER DISPLAY REMOVAL/INSTALLATION.) Connect all the connectors. Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE 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.
		No	Replace the CMU, then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)
5	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).
		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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