Description

Open circuit in microphone circuit

Detection condition

Microphone non-connection signal constantly detected

Fail-safe function

Not applicable

Possible cause

• Connector or terminal malfunction

• Open circuit in wiring harness between Bluetooth unit terminal 1B and microphone terminal B

• Short to ground in wiring harness between Bluetooth unit terminal 1A and microphone terminal A

• Microphone malfunction

• Bluetooth unit malfunction

Step

Inspection

Action

1

• Switch the ignition off (LOCK).

• 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 5.

No

Go to the next step.

2

• 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 5.

No

Go to the next step.

3

• Inspect the wiring harness for continuity between Bluetooth unit terminal 1B and microphone terminal B (vehicle wiring harness side).

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between Bluetooth unit terminal 1B and microphone terminal B.

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 5.

4

• Inspect for continuity between Bluetooth unit terminal 1A (vehicle wiring harness side) and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between Bluetooth unit terminal 1A 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 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 the next step.

No

Go to the next step.

5

• Reconnect all the disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Perform an inspection of the Bluetooth unit DTCs.

  (See DTC INSPECTION [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)].)

• Is the same DTC displayed?

Yes

Replace the microphone, then go to the next step.

(See MICROPHONE REMOVAL/INSTALLATION.)

No

Go to Step 7.

6

• Perform an inspection of the Bluetooth unit DTCs.

  (See DTC INSPECTION [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)].)

• Is the same DTC displayed?

Yes

Replace the Bluetooth unit, then go to the next step.

(See Bluetooth UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

7

• Are any other DTCs displayed?

Yes

Repair the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)].)

No

DTC troubleshooting completed.