Diagnostic Procedure

Step	Inspection		Action
1	INSPECT MICROPHONE CONNECTOR STATUS Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .) Disconnect the microphone connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is there any malfunctioning part?	Yes	Repair or replace the connector, then go to Step 4.
1		No	Go to the next step.
2	INSPECT Bluetooth® UNIT CONNECTOR CONDITION Disconnect the Bluetooth® unit connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is there any malfunctioning part?	Yes	Repair or replace the connector, then go to Step 4.
2		No	Go to the next step.
3	INSPECT FOR SHORT TO POWER SUPPLY IN MICROPHONE INPUT CIRCUIT Reconnect all the disconnected connectors. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .) Switch the ignition ON (engine off or on). Measure the voltage of Bluetooth® unit terminal A (vehicle wiring harness side). Is the voltage B+ ?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between Bluetooth® unit terminal A and microphone terminal A. 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 the next step.
3		No	Go to the next step.
4	PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS MICROPHONE OR Bluetooth® UNIT Perform an inspection of the Bluetooth® unit DTCs. (See DTC INSPECTION [AUDIO] .) Is the same DTC displayed?	Yes	Replace the microphone, then go to the next step. (See MICROPHONE REMOVAL/INSTALLATION .)
4		No	Go to Step 6.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Perform an inspection of the Bluetooth® unit DTCs. (See DTC INSPECTION [AUDIO] .) Is the same DTC displayed?	Yes	Replace the Bluetooth® unit, then go to the next step. (See BLUETOOTH® UNIT REMOVAL/INSTALLATION .)
5		No	Go to the next step.
6	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [AUDIO] .)
6		No	DTC troubleshooting completed.