Infiniti QX56 (Z62). Manual - part 72

AV-142

< DTC/CIRCUIT DIAGNOSIS >

U1232 STEERING ANGLE SENSOR

U1232 STEERING ANGLE SENSOR

DTC Logic

INFOID:0000000006216291

Diagnosis Procedure

INFOID:0000000006216292

1.

ADJUST THE PREDICTIVE COURSE LINE CENTER POSITION OF THE STEERING ANGLE SENSOR

When U1232 is detected, adjust the predictive course line center position of the steering angle sensor.

>> Adjusts the steering angle sensor neutral position on ABS actuator and electrical unit (control unit)

side. Refer to 

BRC-64, "Work Procedure"

.

DTC

Display contents of 

CONSULT-III

DTC detection condition

Possible malfunction factor

U1232

ST ANGLE SEN CALIB 
[1232]

Predictive course line center position adjustment of the 
steering angle sensor is incomplete.

Adjust the predictive course line cen-
ter position of the steering angle sen-
sor.

AV

U1243 FRONT DISPLAY UNIT

AV-143

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U1243 FRONT DISPLAY UNIT

DTC Logic

INFOID:0000000006216293

Diagnosis Procedure

INFOID:0000000006216294

1.

CHECK FRONT DISPLAY UNIT POWER SUPPLY AND GROUND CIRCUITS

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

AV-161, "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-III

DTC Detection Condition

Possible causes

U1243

FRONT DISP CONN
[U1243]

When either one of the following items is 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

M215

9

M210

89

Existed

10

73

Front display unit

Ground

Continuity

Connector

Terminals

M215

9

Not existed

10

AV-144

< DTC/CIRCUIT DIAGNOSIS >

U1243 FRONT DISPLAY UNIT

Is inspection result normal?

YES

>> GO TO 4.

NO

>> Replace AV control unit. Refer to 

AV-212, "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-213, "Removal and Installation"

.

(+)

(

−

)

Condition

Reference value

Front display unit

Connector

Terminal

M215

9

Ground

When adjusting display bright-
ness.

PKIB5039J

(+)

(

−

)

Condition

Reference value

Front display unit

Connector

Terminal

M215

10

Ground

When adjusting display bright-
ness.

PKIB5039J

AV

U1244 GPS ANTENNA

AV-145

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

U1244 GPS ANTENNA

DTC Logic

INFOID:0000000006216295

Diagnosis Procedure

INFOID:0000000006216296

1.

GPS ANTENNA CHECK

Visually check GPS antenna and antenna feeder.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Repair malfunctioning parts.

2.

CHECK AV CONTROL UNIT VOLTAGE 

1.

Disconnect GPS antenna connector.

2.

Turn ignition switch ON.

3.

Check voltage between AV control unit terminal and ground.

Is inspection result normal?

YES

>> INSPECTION END

NO

>> Replace AV control unit. Refer to 

AV-212, "Removal and Installation"

.

DTC

Display contents of 

CONSULT-III

DTC Detection Condition

Possible causes

U1244

GPS ANTENNA CONN
[U1244]

GPS antenna connection malfunction is detected.

GPS antenna disconnection

(+)

(

−

)

Voltage

(Approx.)

AV control unit

Terminal

153

Ground

5.0 V