Nissan Altima 2007-2012 Service Manual: U124C CD changer

Description

Refer to AV-240, "System Description".

DTC Logic

DTC DETECTION LOGIC

Diagnosis Procedure

1.CHECK CD CHANGER POWER SUPPLY AND GROUND CIRCUIT

Check CD changer power supply and ground circuit. Refer to AV-318, "CD CHANGER : Diagnosis Procedure".

Do power and ground check OK? YES >> GO TO 2

NO >> Repair power supply or ground circuit.

2.CHECK COMMUNICATION CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect CD changer connector M42 and AV control unit connector M48.

3. Check continuity between CD changer harness connector M42 (A) terminals 8, 9 and 10 and AV control unit harness connector M48 (B) terminals 69, 70 and 72.

4. Check continuity between CD changer harness connector M42 (A) terminals 8, 9, 10 and ground.

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

NO >> Repair harness or connector.

3.CHECK REQUEST SIGNAL

1. Connect CD changer connector and AV control unit connector.

2. Turn ignition switch ON.

3. Check signal between CD changer harness connector M42 terminal 8 and ground.

Are the voltage readings as specified? YES >> GO TO 4

NO >> Replace CD changer. Refer to AV-439, "Removal and Installation".

4.CHECK COMMUNICATION SIGNAL

Check signal between CD changer harness connector M42 terminal 9 and ground.

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

NO >> Replace CD changer. Refer to AV-439, "Removal and Installation".

5.CHECK COMMUNICATION SIGNAL

Check signal between CD changer harness connector M42 terminal 10 and ground.

Are the voltage readings as specified? YES >> Inspection End.

NO >> Replace AV control unit. Refer to AV-437, "Removal and Installation".

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