Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect audio unit connector and TEL adapter unit connector.
3. Check continuity between audio unit harness connector and TEL adapter unit harness connector.
   CONTINUITY REFERENCE CHART
   
   

   Audio unit		TEL adapter unit		Continuity
   Connector	Terminal	Connector	Terminal
   M82	24	B237	12	Existed

4. Check continuity between audio unit harness connector and ground.
   CONTINUITY REFERENCE CHART
   
   

   Audio unit		Ground	Continuity
   Connector	Terminal
   M82	24		Not existed

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Repair harness or connector.

Check TEL adapter unit power supply. Refer to "TEL ADAPTER UNIT : DIAGNOSIS PROCEDURE ".

Is the inspection result normal? 

YES: GO TO 3.

NO: Replace TEL adapter unit.

1. Connect audio unit connector and TEL adapter unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector.
   VOLTAGE REFERENCE CHART
   
   

   (+)		(-)		Voltage (Approx.)
   Audio unit		Audio unit
   Connector	Terminal	Connector	Terminal
   M82	24	M82	30	5.0 V

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Replace audio unit.

1. Turn ignition switch OFF.
2. Check steering switch. Refer to "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: INSPECTION END

   NO: Replace steering switch.