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

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DTC B108E:06 [CONNECTIVITY MASTER UNIT]

Description	HDCP authorization error
Detection condition	The connectivity master unit (CMU) detected an HDCP authorization error for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	Incorrect display is equipped Center display connector or terminal malfunction Connectivity master unit (CMU) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D Short to power supply in wiring harness between the following terminals: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D Open circuit in wiring harness between the following terminals: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D Center display malfunction Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY THAT INCORRECT DISPLAY IS NOT INSTALLED Verify that the display installed on the vehicle is a Mazda genuine center display. Is the installed display a Mazda genuine center display?	Yes	Go to the next step.
		No	Explain to the customer that a display other than a Mazda genuine is installed. Replace with a Mazda genuine center display, then go to Step 8. (See CENTER DISPLAY REMOVAL/INSTALLATION.)
2	INSPECT CENTER DISPLAY CONNECTOR CONDITION 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 8.
3	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.
		No	Repair or replace the connector, then go to Step 8.
4	INSPECT CENTER DISPLAY CIRCUIT FOR SHORT TO GROUND Verify that the center display and connectivity master unit (CMU) connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side) and body ground: Center display terminal 2B Center display terminal 2D Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground. Go to Step 8.
		No	Go to the next step.
5	INSPECT CENTER DISPLAY CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the center display and connectivity master unit (CMU) connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Center display terminal 2B Center display terminal 2D Is the voltage 0 V?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 8.
6	INSPECT CENTER DISPLAY CIRCUIT FOR OPEN CIRCUIT Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) Verify that the center display and connectivity master unit (CMU) connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Connectivity master unit (CMU) terminal 3B and center display terminal 2B Connectivity master unit (CMU) terminal 3D and center display terminal 2D 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: Connectivity master unit (CMU) terminal 3B—Center display terminal 2B Connectivity master unit (CMU) terminal 3D—Center display terminal 2D If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 8.
7	VERIFY IF MALFUNCTIONING LOCATION IS CENTER DISPLAY DEPENDING ON REPEATABILITY Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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 12 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 center display, then go to the next step. (See CENTER DISPLAY REMOVAL/INSTALLATION.)
		No	Go to Step 9.
8	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) 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 12 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.
		No	Go to the next step.
9	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].)
		No	DTC troubleshooting completed.

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