Communication Signal Circuit Check [Satellite Radio Tuner]
Communication Signal Circuit Check [Satellite Radio Tuner]
Description
Communication signals are exchanged between the audio unit and satellite radio tuner using the communication circuits.
Diagnosis Procedure (Crew Cab)
Regarding Wiring Diagram information, refer to [Mid Audio System: Wiring Diagram [Crew Cab] Mid Audio System [Crew Cab] ].
1. CHECK HARNESS - REQ1
1 Turn ignition switch OFF.
2 Disconnect satellite radio tuner (factory installed) connector M41 and audio unit connector M86.
3 Check continuity between satellite radio tuner (factory installed) harness connector M41 (A) terminal 28 and audio unit harness connector M86 (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 or replace 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 M86 (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 or replace 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 M86 (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 or replace 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 SDT or oscilloscope.
Are voltage readings as specified?
YES
GO TO 5
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.
5. CHECK TXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with SDT or oscilloscope.
Are the voltage readings as specified?
YES
GO TO 6
NO
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Mid (Crew Cab), Premium (King Cab)
6. CHECK RXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 30 and ground with SDT or oscilloscope.
Are the voltage readings as specified?
YES
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Mid (Crew Cab), Premium (King Cab).
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.
Diagnosis Procedure (King Cab)
Regarding Wiring Diagram information, refer to [Premium Audio System: Wiring Diagram [King Cab] Premium Audio System [King Cab] ].
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 or replace 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 or replace 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 or replace 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 SDT or oscilloscope.
Are voltage readings as specified?
YES
GO TO 5
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.
5. CHECK TXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 29 and ground with SDT or oscilloscope.
Are the voltage readings as specified?
YES
GO TO 6
NO
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Mid (Crew Cab), Premium (King Cab)
6. CHECK RXD SIGNAL
Check signal between satellite radio tuner (factory installed) harness connector M41 terminal 30 and ground with SDT or oscilloscope.
Are the voltage readings as specified?
YES
Replace satellite radio tuner. Refer to [Satellite Radio Tuner: Removal and Installation] Mid (Crew Cab), Premium (King Cab).
NO
Replace audio unit. Refer to [Audio Unit: Removal and Installation] Audio Unit.