Infiniti G37 Coupe. Manual - part 101

 

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Infiniti G37 Coupe. Manual - part 101

 

 

AV

U1255 SATELLITE RADIO TUNER

AV-157

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

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U1255 SATELLITE RADIO TUNER

Description

INFOID:0000000001559282

DTC Logic

INFOID:0000000001559283

Diagnosis Procedure

INFOID:0000000001559284

1.

CHECK SATELLITE RADIO TUNER POWER SUPPLY AND GROUND CIRCUIT

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

AV-164, "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 terminals 28, 29, 30 and satellite radio tuner
harness connector terminals 8, 9, 10.

4.

Check continuity between AV control unit harness connector terminals 28, 29 and 30.

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 voltage between AV control unit harness connector terminal 28, 29 and ground.

Part name

Description

SATELLITE RADIO TUNER

• Inputs the satellite radio signal from satellite radio antenna and outputs it to the 

AV control unit.

• It is controlled with the communication (communication signal, request signal) 

from AV control unit.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1255

SAT CONN
[U1255]

• Satellite radio tuner power supply and ground circuit 

malfunction is detected.

• Malfunction is detected in communication circuit be-

tween AV control unit and satellite radio tuner.

• Malfunction is detected in communication signal be-

tween AV control unit and satellite radio tuner.

• Malfunction is detected in request signal circuit be-

tween AV control unit and satellite radio tuner.

• Satellite radio tuner power supply 

and ground circuit.

• Communication circuit between AV 

control unit and satellite radio tun-
er.

• Request signal circuit between AV 

control unit and satellite radio tun-
er.

28 - 8

: Continuity should exist.

29 - 9

: Continuity should exist.

30 - 10

: Continuity should exist.

28 - Ground

: Continuity should not exist.

29 - Ground

: Continuity should not exist.

30 - Ground

: Continuity should not exist.

AV-158

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

U1255 SATELLITE RADIO TUNER

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit.

4.

CHECK SATELLITE RADIO TUNER

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connector.

3.

Connect satellite radio tuner.

4.

Turn ignition switch ON.

5.

Check voltage between satellite radio tuner harness connector terminal 10 and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace satellite radio tuner.

28 - Ground

: Approx 7.5 V

29 - Ground

: Approx 7.0 V

10 - Ground

: Approx 7.0 V

AV

U1300 AV COMM CIRCUIT

AV-159

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

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U1300 AV COMM CIRCUIT

Description

INFOID:0000000001559016

U1300 is indicated when malfunction occurs in communication signal of multi AV system. Indicated simulta-
neously, without fail, with the malfunction of control units connected to AV control unit with communication line.
Determine the possible malfunction cause from the table below.

SELF-DIAGNOSIS RESULTS DISPLAY ITEM

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1300
U1240

• AV COMM CIRCUIT

[U1300]

• SWITCH CONN

[U1240]

• Multifunction switch power supply and ground circuit 

malfunction is detected.

• Malfunction is detected in AV communication circuit be-

tween AV control unit and multifunction switch.

• Malfunction is detected in AV communication signal be-

tween AV control unit and multifunction switch.

• Multifunction switch power supply 

and ground circuits.

• AV communication circuit between 

AV control unit and multifunction 
switch.

U1300
U1254

• AV COMM CIRCUIT

[U1300]

• IPod CONN

[U1254]

• iPod adapter power supply and ground circuit malfunc-

tion is detected.

• Malfunction is detected in AV communication circuit be-

tween AV control unit and iPod adapter.

• A malfunction is detected in AV communication signal 

between AV control unit and iPod adapter.

• iPod adapter power supply and 

ground circuits.

• AV communication circuit between 

AV control unit and iPod adapter.

U1300
U1256

• AV COMM CIRCUIT

[U1300]

• HAND FREE CONN 

[U1256]

• TEL adapter unit power supply and ground circuit mal-

function is detected.

• Malfunction is detected in AV communication circuit be-

tween AV control unit and TEL adapter unit.

• Malfunction is detected in AV communication signal be-

tween AV control unit and TEL adapter unit.

• TEL adapter unit power supply and 

ground circuit.

• AV communication circuit between 

AV control unit and TEL adapter 
unit.

U1300
U1240
U1254
U1256

• AV COMM CIRCUIT 

[U1300]

• SWITCH CONN 

[U1240]

• IPod CONN

[U1254]

• HAND FREE CONN 

[U1256]

Malfunction is detected in AV communication circuit be-
tween AV control unit and the branch point multifunction 
switch and AV control unit.

AV communication circuit between 
AV control unit and the branch point 
multifunction switch and AV control 
unit.

AV-160

< COMPONENT DIAGNOSIS >

[BOSE AUDIO WITHOUT NAVIGATION]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AV CONTROL UNIT

AV CONTROL UNIT : Diagnosis Procedure

INFOID:0000000001559017

1.

CHECK FUSE

Check for blown fuses.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Be sure to eliminate cause of malfunction before installing new fuse. 

2.

CHECK POWER SUPPLY CIRCUIT

Check voltage between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check harness between AV control unit and fuse.

3.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect AV control unit connectors.

3.

Check continuity between AV control unit harness connectors and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

DISPLAY UNIT

DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000001559018

1.

CHECK POWER SUPPLY CIRCUIT (DISPLAY SIDE)

Check voltage between display unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

Power source

Fuse No.

Battery

34

Ignition switch ACC or ON

19

Ignition switch ON or START 

3

Signal name

Connector No.

Terminal No.

Ignition switch position

Value (Approx.)

Battery power supply

M81

19

OFF

12 V

ACC power supply

M81

7

ACC

12 V

Ignition signal

M85

104

ON

12 V

Signal name

Connector No.

Terminal No.

Ignition switch position

Continuity 

Ground

M81

20

OFF

Existed

M85

85

Signal name

Connector No.

Terminal No.

Ignition switch position

Value (Approx.)

Inverter VCC

M71

2

ACC

9 V

Signal VCC

3

 

 

 

 

 

 

 

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