Impossible to call using hands-free system (if equipped)

Precautions: Precautions for Audio Visual / Navigation · Precautions for Body, Cab and Accessories · General safety (00)

Before performing the following troubleshooting, check if the symptom is not caused by incorrect handling while referring to Owner’s Manual.

If the cause cannot be identified by the following troubleshooting, replace audio unit with a known-good one. If the symptom is cleared, audio unit is the cause.

Condition	Possible Cause	Action
Impossible to call using hands-free system (if equipped)	Faulty driver side microphone connector	Check driver side microphone connectors for connection.
	Faulty driver side microphone	Refer to Inspection of Audio System and Its Circuit.
	Faulty driver side microphone circuit	Refer to Audio System Circuit Diagram.
	Faulty hands-free switch connector	Check Steering switch connectors for connection.
	Faulty hands-free switch	Refer to Steering Switch (Audio Control Switch and Hands-Free Switch) Inspection (If Equipped).
	Faulty hands-free switch circuit	Refer to Audio System Circuit Diagram.