Nissan Altima 2007-2012 Service Manual: Communication signal circuit (sedan) satellite radio tuner

 Description

Communication signals are exchanged between the audio unit and satellite radio tuner using the communication circuits.

 Diagnosis Procedure

1.CHECK HARNESS - 1

1. Turn ignition switch OFF.

2. Disconnect satellite radio tuner (factory installed) connector B123 and audio unit connector M45.

3. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 28 and audio unit harness connector M45 (B) terminal 38.

4. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 28 and ground.

Are continuity results as specified? YES >> GO TO 2

NO >> Repair harness or connector.

2.CHECK HARNESS - 2

1. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 29 and audio unit harness connector M45 (B) terminal 39.

2. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 29 and ground.

Are continuity results as specified? YES >> GO TO 3

NO >> Repair harness or connector.

3.CHECK HARNESS - 3

1. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 30 and audio unit harness connector M45 (B) terminal 40.

2. Check continuity between satellite radio tuner (factory installed) harness connector B123 (A) terminal 30 and ground.

Are continuity results as specified? YES >> GO TO 4

NO >> Repair 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 B123 terminal 28 and ground with CONSULT-III or oscilloscope.

Are voltage readings as specified? YES >> GO TO 5

NO >> Replace audio unit. Refer to AV-215, "Removal and Installation".

5.CHECK TXD SIGNAL

Check signal between satellite radio tuner (factory installed) harness connector B123 terminal 29 and ground with CONSULT-III or oscilloscope.

Are the voltage readings as specified? YES >> GO TO 6

NO >> Replace satellite radio tuner. Refer to AV-223, "Removal and Installation - Sedan".

6.CHECK RXD SIGNAL

Check signal between satellite radio tuner (factory installed) harness connector B123 terminal 30 and ground with CONSULT-III or oscilloscope.

Are the voltage readings as specified? YES >> Replace satellite radio tuner. Refer to AV-223, "Removal and Installation - Sedan".

NO >> Replace audio unit. Refer to AV-215, "Removal and Installation".

    Satellite radio tuner
    Description Communication signals are exchanged between the audio unit and satellite radio tuner using the communication circuits. Diagnosis Procedure 1.CHECK HARNESS - 1 . Turn ignition switc ...

    Sound signal circuit (coupe)
    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 LEF ...

    Other materials:

    Control system
    System Diagram System Description The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift position and reduces shifting and lock-up shocks. TCM FUNCTION The function of the TCM is to: • Receive input signals sent from various switches an ...

    P1421 Cold start control
    Description ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition. This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions. DTC Logic DTC DETECTION LOGIC NOTE: • If DTC P1421 is displayed ...

    Monitor, climate, audio, phone and voice recognition systems
    WARNING ● Positioning of the heating or air conditioning controls and display controls should not be done while driving in order that full attention may be given to the driving operation. ● Do not disassemble or modify this system. If you do, it may result in accidents, fire, o ...