U1255

U1255 SATELLITE RADIO TUNER

DTC Logic








Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" Base Audio.

1. CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

Check satellite radio tuner power supply and ground circuit. Refer to "SATELLITE RADIO TUNER : Diagnosis Procedure" Power Supply and Ground Circuit.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace harness or connectors.

2. CHECK COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT CONTINUITY

1.Turn ignition switch OFF.
2.Disconnect AV control unit connector M51 and satellite radio tuner connector B2.
3.Check continuity between AV control unit connector M51 terminals 100, 101, 102 and satellite radio tuner connector B2 terminals 28, 29, 30.





4.Check continuity between AV control unit connector M51 terminals 100, 101, 102 and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace harness or connectors.

3. CHECK AV CONTROL UNIT VOLTAGE

1.Connect AV control unit connector M51.
2.Turn ignition switch ON.
3.Check signal between AV control unit connector M51 terminals 100, 101 and ground.
Revision: March 20122013 Infiniti JX





Is the inspection result normal?
YES- GO TO 4.
NO- Replace AV control unit. Refer to "Removal and Installation AV Control Unit" Base Audio.

4. CHECK SATELLITE RADIO TUNER VOLTAGE

1.Turn ignition switch OFF.
2.Disconnect AV control unit connector M51.
3.Connect satellite radio tuner connector B2.
4.Turn ignition switch ON.
5.Check signal between satellite radio tuner connector B2 terminal 30 and ground.





Is the inspection result normal?
YES- Inspection End.
NO- Replace satellite radio tuner. Refer to "Removal and Installation" Removal and Installation.
Revision: March 20122013 Infiniti JX