Nissan Quest E52. Manual - part 82

AV

U1243 FRONT DISPLAY UNIT

AV-207

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

C

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U1243 FRONT DISPLAY UNIT

DTC Logic

INFOID:0000000009652035

Diagnosis Procedure

INFOID:0000000009652036

1.

CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS

Check front display unit power supply and ground circuits. Refer to 

AV-213, "FRONT DISPLAY UNIT : Diagno-

sis Procedure"

.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION CIRCUITS

1.

Turn ignition switch OFF.

2.

Disconnect front display unit connector and AV control unit connector.

3.

Check continuity between front display unit harness connector and AV control unit harness connector.

4.

Check continuity between front display unit harness connector and ground.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK COMMUNICATION SIGNAL

1.

Connect front display unit connector and AV control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between front display unit harness connector and ground.

DTC

Display contents of 

CONSULT

DTC detection condition

Possible malfunction factor

U1243

FRONT DISP CONN
[U1243]

When either one of the following items are detected:
• front display unit power supply and ground circuits are 

malfunctioning.

• serial communication circuits between front display unit 

and AV control unit are malfunctioning.

• Front display unit power supply and 

ground circuits.

• Serial communication circuits be-

tween front display unit and AV 
control unit.

Front display unit

AV control unit

Continuity

Connector

Terminals

Connector

Terminals

M156

11

M172

51

Existed

22

39

Front display unit

Ground

Continuity

Connector

Terminals

M156

11

Not existed

12

AV-208

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

U1243 FRONT DISPLAY UNIT

Is inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-250, "Removal and Installation"

.

4.

CHECK COMMUNICATION SIGNAL

Check signal between front display unit harness connector and ground.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Replace front display unit. Refer to 

AV-251, "Removal and Installation"

.

Probe

Condition

Standard

Reference value

(+)

(

−

)

Front display unit

Connector

Terminal

Connector

Terminal

M156

11

M156

1

When ad-
justing dis-
play 
brightness.

Waveform of 0.4 V - 5.3 
V is input.

PKIB5039J

Probe

Condition

Standard

Reference value

(+)

(

−

)

Front display unit

Connector

Terminal

Connector

Terminal

M156

22

M156

1

When ad-
justing dis-
play 
brightness.

Waveform of 0.5 V or 
less - 3.5 V or more is in-
put.

PKIB5039J

AV

U1255 SATELLITE RADIO TUNER

AV-209

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

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U1255 SATELLITE RADIO TUNER

DTC Logic

INFOID:0000000009652037

Diagnosis Procedure

INFOID:0000000009652038

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-215, "SATELLITE RADIO TUNER :

Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK CONTINUITY COMMUNICATION CIRCUIT AND REQUEST SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector and satellite radio tuner connector.

3.

Check continuity between AV control unit harness connector and satellite radio tuner harness connector.

4.

Check continuity between AV control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK AV CONTROL UNIT VOLTAGE

1.

Connect AV control unit connector.

2.

Turn ignition switch ON.

3.

Check signal between AV control unit harness connector and ground.

DTC

Display contents of 

CONSULT

DTC Detection Condition

Possible causes

U1255

SAT CONN
[U1255]

When either one of the following items is detected:
• satellite radio tuner power supply and ground circuit are 

malfunctioning.

• communication circuits between AV control unit and 

satellite radio tuner are malfunctioning.

• request signal circuit between AV control unit and sat-

ellite radio tuner are malfunctioning.

• Satellite radio tuner power supply 

and ground circuit.
Refer to 

AV-215, "SATELLITE RA-

DIO TUNER : Diagnosis Proce-
dure"

.

• Communication circuit between AV 

control unit and satellite radio tun-
er.

• Request signal circuit between AV 

control unit and satellite radio tun-
er.

AV control unit

Satellite radio tuner

Continuity

Connector

Terminals

Connector

Terminals

M176

122

B49

10

Existed

129

8

130

9

AV control unit

Ground

Continuity

Connector

Terminals

M176

122

Not existed

129

130

AV-210

< DTC/CIRCUIT DIAGNOSIS >

[BASE AUDIO WITH SEPARATE DISPLAY]

U1255 SATELLITE RADIO TUNER

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-250, "Removal and Installation"

.

4.

CHECK SATELLITE RADIO TUNER VOLTAGE

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector.

3.

Connect satellite radio tuner.

4.

Turn ignition switch ON.

5.

Check signal between satellite radio tuner harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace satellite radio tuner. Refer to 

AV-264, "Removal and Installation"

.

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Connector

Terminals

M176

129

Ground

7.0 V

130

7.0 V

(+)

(

−

)

Voltage

(Approx.)

Satellite radio tuner

Connector

Terminal

B49

10

Ground

7.0 V