Sound Signal Circuit

SOUND SIGNAL CIRCUIT

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.

SATELLITE RADIO TUNER : Diagnosis Procedure

Regarding Wiring Diagram information, 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 CONSULT or oscilloscope.

Are voltage readings as specified?
YES- Replace audio unit. Premium Audio (Crew Cab).
NO- Replace satellite radio tuner. Premium Audio (Crew Cab).

RIGHT CHANNEL

1. CHECK HARNESS

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 CONSULT or oscilloscope.

Are voltage readings as specified?
YES- Replace audio unit. Premium Audio (Crew Cab).
NO- Replace satellite radio tuner. Premium Audio (Crew Cab).