Nissan Sentra. Manual - part 69

AV-268

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION WITHOUT BOSE]

U12B1 POWER SUPPLY VOLTAGE

U12B1 POWER SUPPLY VOLTAGE

DTC Logic

INFOID:0000000009758971

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000009758972

1.

CHECK CHARGING SYSTEM

Check the vehicle charging system. Refer to 

STR-20, "Work Flow (With GR8-1200 NI)"

 or 

STR-24, "Work

Flow (Without GR8-1200 NI)"

.

Is the inspection result normal?

YES

>> Replace the AV control unit. Refer to 

AV-298, "Removal and Installation"

.

NO

>> Repair or replace the malfunctioning components.

CONSULT Display

DTC Detection Condition

Possible Cause

Supply Voltage Goes High > 
16V for 20s
[U12B1]

AV control unit supply voltage exceeds upper lim-
its.

Charging system malfunction.

AV

U1310 AV CONTROL UNIT

AV-269

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION WITHOUT BOSE]

C

D

E

F

G

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U1310 AV CONTROL UNIT

DTC Logic

INFOID:0000000009758973

DTC DETECTION LOGIC

CONSULT Display

DTC Detection Condition

Possible Cause

CONTROL UNIT (AV)
[U1310]

Error during CAN controller hardware initializa-
tion (MCAN).

Replace AV control unit if malfunction occurs 
constantly.
Refer to 

AV-298, "Removal and Installation"

.

AV-270

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION WITHOUT BOSE]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT
AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000009758974

Regarding Wiring Diagram information, refer to 

AV-234, "Wiring Diagram"

.

1.

CHECK FUSE

Check that the following fuses are not blown.

Are the fuses blown?

YES

>> Replace the blown fuse after repairing the affected circuit.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect AV control unit connectors M103 and M104.

3. Check voltage between AV control unit connectors M103 and M104 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between AV control unit connector M103 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace harness or connectors.

Terminal No.

Signal name

Fuse No.

7

ACC power supply

18 (10A)

19

Battery power supply

26 (15A)

37

Ignition power supply

5 (10A)

AV control unit

Ground

Condition

Voltage

(Approx.)

Connector

Terminal

M103

19

—

Ignition switch: OFF

Battery voltage

7

Ignition switch: ON

M104

37

AV control unit

Ground

Continuity 

Connector

Terminal

M103

20

—

Yes

AV

FRONT DOOR SPEAKER

AV-271

< DTC/CIRCUIT DIAGNOSIS >

[NAVIGATION WITHOUT BOSE]

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FRONT DOOR SPEAKER

Diagnosis Procedure

INFOID:0000000009758975

Regarding Wiring Diagram information, refer to 

AV-234, "Wiring Diagram"

.

1.

CONNECTOR CHECK

Check the AV control unit and speaker connectors for the following:

•  Proper connection

•  Damage

•  Disconnected or loose terminals
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair the terminals or connectors.

2.

CHECK FRONT DOOR SPEAKER SIGNAL CIRCUIT CONTINUITY

1. Disconnect AV control unit connector M103 and suspect front door speaker connector.

2. Check continuity between AV control unit connector M103 and suspect front door speaker connector.

3. Check continuity between AV control unit connector M103 and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness or connectors.

3.

CHECK FRONT DOOR SPEAKER SIGNAL

1. Connect AV control unit connector M103 and suspect front door speaker connector.

2. Turn ignition switch to ACC.

3. Push AV control unit POWER switch.

4. Check signal between the terminals of AV control unit connector M103.

AV control unit

Front door speaker

Continuity

Connector

Terminal

Connector

Terminal

M103

2

D10 (LH)

1

Yes

3

2

11

D110 (RH)

1

12

2

AV control unit

Ground

Continuity

Connector

Terminal

M103

2

—

No

3

11

12

AV control unit connector M103

Condition

Reference value

(+)

(

−)

Terminal

Terminal