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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (Audio, Visual & Navigation System (DTC/Circuit Diagnosis) (BOSE Audio Without Navigation) (Except Hybrid) (1 Of 2)) >> DTC/Circuit Diagnosis >> DTC U1255: Satellite Radio Tuner >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  1. CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

    Check satellite radio tuner power supply and ground circuit. Refer to DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 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 M196 and satellite radio tuner connector B2.
    3. Check continuity between AV control unit connector M196 terminals 100, 101, 102 and satellite radio tuner connector B2 terminals 28, 29, 30.
      AV control unit Satellite radio tuner Continuity
      Connector Terminals Connector Terminals
      M196 100 B2 28 Yes
      101 29
      102 30
    4. Check continuity between AV control unit connector M196 terminals 100, 101, 102 and ground.
      AV control unit Ground Continuity
      Connector Terminals
      M196 100 No
      101
      102

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair or replace harness or connectors.

  3. CHECK AV CONTROL UNIT VOLTAGE

    1. Connect AV control unit connector M196.
    2. Turn ignition switch ON.
    3. Check signal between AV control unit connector M196 terminals 100, 101 and ground.
      AV control unit Ground Voltage
      (Approx.)
      (+) (-)
      Connector Terminals
      M196 100 - 7.0 V
      101

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Replace AV control unit. Refer to REMOVAL AND INSTALLATION .

  4. CHECK SATELLITE RADIO TUNER VOLTAGE

    1. Turn ignition switch OFF.
    2. Disconnect AV control unit connector M196.
    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.
      Satellite radio tuner Ground Voltage
      (Approx.)
      (+) (-)
      Connector Terminals
      B2 30 - 7.0 V

    Is the inspection result normal?

    YES 

    Inspection End.

    NO 

    Replace satellite radio tuner. Refer to REMOVAL AND INSTALLATION .

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