Nissan Pathfinder. Manual - part 77

AV

U122E AV CONTROL UNIT

AV-135

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

C

D

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F

G

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B

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U122E AV CONTROL UNIT

DTC Logic

INFOID:0000000009174458

CONSULT Display

DTC Detection Condition

Possible Cause

Built-in AUDIO CONN
[U122E]

AV control unit malfunction is detected.

Replace AV control unit if malfunction occurs con-
stantly.
Refer to 

AV-187, "Removal and Installation"

.

AV-136

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

U1243 DISPLAY UNIT

U1243 DISPLAY UNIT

DTC Logic

INFOID:0000000009174459

Diagnosis Procedure

INFOID:0000000009174460

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUIT

Check display unit power supply and ground circuits. Refer to 

AV-144, "AV CONTROL UNIT : Diagnosis Pro-

cedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness or connectors.

2.

CHECK COMMUNICATION CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect display unit connector and AV control unit connector M136.

3. Check continuity between display unit connector M93 terminals 11, 22 and AV control unit connector

M136 terminals 73, 61.

4. Check continuity between display unit connector M93 terminals 11, 22 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK COMMUNICATION SIGNAL (DISP

→CONT)

1. Connect display unit connector and AV control unit connector M136.

2. Turn ignition switch ON.

3. Check signal between display unit connector M93 terminal 11 and ground.

CONSULT Display

DTC Detection Condition

Possible Cause

FRONT DISP CONN
[U1243]

When any of the following is detected:
• display unit power supply or ground circuit mal-

function.

• serial communication circuit malfunction be-

tween display unit and AV control unit.

• Display unit power supply and ground circuits.
• Serial communication circuits between display 

unit and AV control unit.

Display unit

AV control unit

Continuity

Connector

Terminal

Connector

Terminal

M93

11

M136

73

Yes

22

61

Display unit

Ground

Continuity

Connector

Terminal

M93

11

—

No

22

AV

U1243 DISPLAY UNIT

AV-137

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-187, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL (CONT

→DISP)

Check signal between display unit connector M93 terminal 22 and ground.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace display unit. Refer to 

AV-191, "Removal and Installation"

.

Display unit

Ground

Condition

Reference value

(+)

(

−)

Connector

Terminal

M93

11

—

When adjusting dis-
play brightness.

PKIB5039J

Display unit

Ground

Condition

Reference value

(+)

(

−)

Connector

Terminal

M93

22

—

When adjusting dis-
play brightness.

PKIB5039J

AV-138

< DTC/CIRCUIT DIAGNOSIS >

[MID AUDIO WITHOUT BOSE]

U1255 SATELLITE RADIO TUNER

U1255 SATELLITE RADIO TUNER

DTC Logic

INFOID:0000000009174461

Diagnosis Procedure

INFOID:0000000009174462

Regarding Wiring Diagram information, refer to 

AV-88, "Wiring Diagram"

.

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-146, "SATELLITE RADIO TUNER :

Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 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 M138 and satellite radio tuner connector B2.

3. Check continuity between AV control unit connector M138 terminals 100, 101, 102 and satellite radio

tuner connector B2 terminals 28, 29, 30.

4. Check continuity between AV control unit connector M138 terminals 100, 101, 102 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connectors.

3.

CHECK AV CONTROL UNIT VOLTAGE

1. Connect AV control unit connector M138.

2. Turn ignition switch ON.

3. Check voltage between AV control unit connector M138 terminals 100, 101 and ground.

CONSULT Display

DTC Detection Condition

Possible Cause

SAT CONN
[U1255]

When any of the following is detected:
• satellite radio tuner power supply or ground circuit 

malfunction.

• communication circuit malfunction between AV 

control unit and satellite radio tuner.

• request signal circuit malfunction between AV 

control unit and satellite radio tuner.

• Satellite radio tuner power supply and ground cir-

cuits.

• Communication circuits between AV control unit 

and satellite radio tuner.

• Request signal circuits between AV control unit 

and satellite radio tuner.

AV control unit

Satellite radio tuner

Continuity

Connector

Terminal

Connector

Terminal

M138

100

B2

28

Yes

101

29

102

30

AV control unit

Ground

Continuity

Connector

Terminal

M138

100

No

101

102