Telephone On Signal Circuit

TELEPHONE ON SIGNAL CIRCUIT

Description

When telephone is being used. TEL adapter unit transmits telephone ON signal to audio unit.


Diagnosis Procedure


1. CHECK CONTINUITY TELEPHONE ON SIGNAL CIRCUIT

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





4.Check continuity between TEL adapter unit harness connector and ground.





Is inspection result OK?
YES- GO TO 2.
NO- Repair harness or connector.

2. CHECK TELEPHONE ON SIGNAL

1.Connect audio unit connector.
2.Turn ignition switch ON.
3.Check voltage between audio unit harness connector and ground.





Is inspection result OK?
YES- INSPECTION END
NO- Replace audio unit. Bose Audio.