Nissan Pathfinder. Manual - part 78

AV

U1255 SATELLITE RADIO TUNER

AV-139

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

C

D

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F

G

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K

L

M

B

A

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-187, "Removal and Installation"

.

4.

CHECK SATELLITE RADIO TUNER VOLTAGE

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M138.

3. Connect satellite radio tuner connector B2.

4. Turn ignition switch ON.

5. Check voltage between satellite radio tuner connector B2 terminal 32 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace satellite radio tuner. Refer to 

AV-199, "Removal and Installation"

.

AV control unit

Ground

Voltage

(Approx.)

(+)

(

−)

Connector

Terminal

M138

100

—

7.0  V

101

Satellite radio tuner

Ground

Voltage

(Approx.)

(+)

(

−)

Connector

Terminal

B2

32

—

7.0 V

AV-140

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

U1263 USB

U1263 USB

DTC Logic

INFOID:0000000009174463

Diagnosis Procedure

INFOID:0000000009174464

1.

CHECK USB INTERFACE HARNESS

Visually inspect USB interface harness.
Is the inspection result normal?

YES

>> GO TO 2. 

NO

>> Replace USB interface harness. Refer to 

AV-195, "Removal and Installation"

.

2.

CHECK USB INTERFACE HARNESS CONTINUITY

Check USB interface harness continuity. Refer to 

AV-140, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace AV control unit. Refer to 

AV-187, "Removal and Installation"

.

NO

>> Replace USB interface harness. Refer to 

AV-195, "Removal and Installation"

.

CONSULT Display

DTC Detection Condition

Possible Cause

USB OVERCURRENT
[U126]

Overcurrent in USB connector is detected.

Check USB harness between the AV control unit 
and USB connector.

AV

U1264 ANTENNA AMP.

AV-141

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

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U1264 ANTENNA AMP.

DTC Logic

INFOID:0000000009174465

Diagnosis Procedure

INFOID:0000000009174466

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND ANTENNA BASE

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector M155 and antenna base connector M502.

3. Check continuity between AV control unit connector M155 and antenna base connector M502.

4. Check continuity between AV control unit connector M155 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness or connectors.

2.

CHECK AV CONTROL UNIT VOLTAGE

1. Connect AV control unit connector M155.

2. Turn ignition switch ON.

3. Check voltage between AV control unit connector M155 and ground.

Is the inspection result normal?

YES

>> Replace antenna base. Refer to 

AV-204, "Removal and Installation"

.

NO

>> Replace AV control unit. Refer to 

AV-187, "Removal and Installation"

.

CONSULT Display

DTC Detection Condition

Possible Cause

ANTENNA AMP TERMINAL
[U1264]

Antenna amp. ON signal circuit open or short cir-
cuited.

Antenna amp. ON signal circuit between AV con-
trol unit and antenna amp.

AV control unit

Antenna base

Continuity

Connector

Terminal

Connector

Terminal

M155

126

M502

1

Yes

AV control unit

Ground

Continuity

Connector

Terminal

M155

126

—

No

AV control unit

Ground

Voltage

(Approx.)

(+)

(–)

Connector

Terminal

M155

126

—

Battery voltage

AV-142

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

U1300 AV COMM CIRCUIT

U1300 AV COMM CIRCUIT

Description

INFOID:0000000009174467

U1300 is indicated when a malfunction occurs in the communication signal of the multi AV system. Indicated

simultaneously, without fail, the malfunction of control units connected to the AV control unit through communi-

cation circuits. Determine the possible malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

CONSULT Display

DTC Detection Condition

Possible Cause

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

When any of the following is detected:
• A/C and AV switch assembly power supply or 

ground circuit malfunction.

• AV communication circuit malfunction between 

AV control unit and A/C and AV switch assem-
bly.

• A/C and AV switch assembly power supply and 

ground circuits.

• AV communication circuits between AV control 

unit and A/C and AV switch assembly.

• AV COMM CIRCUIT

[U1300]

• HAND FREE CONN

[U1256]

When any of the following is detected:
• Bluetooth

®

 control unit power supply or ground 

circuit malfunction.

• AV communication circuit malfunction between 

AV control unit and Bluetooth

®

 control unit.

• Bluetooth

®

 control unit power supply and ground 

circuits.

• AV communication circuits between AV control 

unit and Bluetooth

®

 control unit.

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

• HAND FREE CONN

[U1256]

AV communication circuit malfunction between AV 
control unit and A/C and AV switch assembly.

AV communication circuits between AV control unit 
and A/C and AV switch assembly.