Communication Signal Circuit

COMMUNICATION SIGNAL CIRCUIT


SATELLITE RADIO TUNER : Description

Communication signals are exchanged between the audio unit and satellite radio tuner using the communication circuits.





COMMUNICATION SIGNAL CIRCUIT


SATELLITE RADIO TUNER : Diagnosis Procedure

Regarding Wiring Diagram information, Premium Audio.
1.CHECK HARNESS - REQ1





1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M42.
3. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and audio unit harness connector M42 (B) terminal 48.





4. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and ground.





Are continuity results as specified?
YES - GO TO 2
NO - Repair harness or connector.
2.CHECK HARNESS - TXD





1. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and audio unit harness connector M42 (B) terminal 49.





2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 29 and ground.





Are continuity results as specified?
YES - GO TO 3
NO - Repair harness or connector.
3.CHECK HARNESS - RXD





1. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and audio unit harness connector M42 (B) terminal 50.





2. Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 30 and ground.





Are continuity results as specified?
YES - GO TO 4
NO - Repair harness or connector.
4.CHECK REQ1 SIGNAL
1. Connect satellite radio tuner (factory installed) connector and audio unit connector.
2. Turn ignition switch to ACC





3. Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 28 and ground with CONSULT-III or oscilloscope.





Are voltage readings as specified?
YES - GO TO 5
NO - Replace audio unit. Premium Audio.
5.CHECK TXD SIGNAL





Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with CONSULT-III or oscilloscope.





Are the voltage readings as specified?
YES - GO TO 6
NO - Replace satellite radio tuner.
6.CHECK RXD SIGNAL





Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 30 and ground with CONSULT-III or oscilloscope.





Are the voltage readings as specified?
YES - Replace satellite radio tuner. Satellite Radio Tuner.
NO - Replace audio unit. Premium Audio.