Sound Signal Circuit Check [Satellite Radio Tuner]

Sound Signal Circuit Check [Satellite Radio Tuner]

Description

Left and right channel audio signals are supplied from the satellite radio tuner to the audio unit through the sound signal circuits.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Premium Audio System: Wiring Diagram [Crew Cab] Premium Audio System [Crew Cab] ].

Left Channel

1. CHECK HARNESS

1 Turn ignition switch OFF.





2 Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M48.
3 Check continuity between satellite radio tuner (factory installed) connector M41 (A) and audio unit connector M48 (B).






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






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

2. CHECK LEFT CHANNEL AUDIO SIGNAL

1 Connect satellite radio tuner (factory installed) and audio unit.
2 Turn ignition switch ON.
3 Check signal between satellite radio tuner (factory installed) connector M41 terminals 21 and 22 with SDT or oscilloscope.











Are voltage readings as specified?
YES
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.
NO
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Premium Audio (Crew Cab).

Right Channel

1. CHECK HARNESS

1 Turn ignition switch OFF.





2 Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M48.
3 Check continuity between satellite radio tuner (factory installed) M41 (A) and audio unit M48 (B).






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






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

2. CHECK RIGHT CHANNEL AUDIO SIGNAL

1 Connect satellite radio tuner (factory installed) and audio unit.
2 Turn ignition switch ON.
3 Check signal between satellite radio tuner (factory installed) connector M41 terminals 23 and 24 with SDT or oscilloscope.











Are voltage readings as specified?
YES
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.
NO
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Premium Audio (Crew Cab).