Communication Signal Circuit

COMMUNICATION SIGNAL CIRCUIT:_:SATELLITE RADIO TUNER





Description
Communication signals are exchanged between the AV control unit and satellite radio tuner using the communication circuits.




Diagnosis Procedure
Regarding Wiring Diagram information, Bose Audio Without Navigation.
1.CHECK HARNESS - 1





1. Turn ignition switch OFF.
2. Disconnect satellite radio tuner (factory installed) connector M45 and AV control unit connector M170.
3. Check continuity between satellite radio tuner (factory installed) harness connector M45 (A) terminal 28 and AV control unit harness connector M170 (B) terminal 28.





4. Check continuity between satellite radio tuner (factory installed) harness connector M45 (A) terminal 28 and ground.





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





1. Check continuity between satellite radio tuner (factory installed) harness connector M45 (A) terminal 29 and AV control unit harness connector M170 (B) terminal 29.





2. Check continuity between satellite radio tuner (factory installed) harness connector M45 (A) terminal 29 and ground.





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





1. Check continuity between satellite radio tuner (factory installed) harness connector M45 (A) terminal 30 and AV control unit harness connector M170 (B) terminal 30.





2. Check continuity between satellite radio tuner (factory installed) harness connector M45 (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 AV control unit connector.
2. Turn ignition switch to ACC





3. Check signal between satellite radio tuner (factory installed) harness connector M45 terminal 28 and ground with CONSULT-III or oscilloscope.





Are voltage readings as specified?
YES - GO TO 5.
NO - Replace AV control unit. Removal And Installation Bose Audio Without Navigation.
5.CHECK TXD SIGNAL





Check signal between satellite radio tuner (factory installed) harness connector M45 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 M45 terminal 30 and ground with CONSULT-III or oscilloscope.





Are the voltage readings as specified?
YES - Replace satellite radio tuner. Service and Repair.
NO - Replace AV control unit. Removal And Installation Bose Audio Without Navigation.