Infiniti G37 Coupe. Manual - part 655

EXL-40

< FUNCTION DIAGNOSIS >

[XENON TYPE]

DIAGNOSIS SYSTEM (AFS)

DIAGNOSIS SYSTEM (AFS)

CONSULT-III Function (ADAPTIVE LIGHT)

INFOID:0000000001604618

APPLICATION ITEM

WORK SUPPORT

*: Adjusts the steering angle sensor neutral position on ABS actuator and electrical unit (control unit) side. Refer to 

BRC-8, "ADJUST-

MENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Special Repair Requirement"

.

DATA MONITOR

*: The swivel angle "0

°

" (feedback value) of the swivel position sensor signal may differ from the swivel angle "0

°

" of the swivel motor

(AFS control unit command value). This causes that the swivel motor initializes the value based on the step number from the stopper. 

ACTIVE TEST

CAUTION:

Start the engine when using “ACTIVE TEST”.

Diagnostic mode

Description

Ecu Identification

Allows confirmation of auto levelizer control unit part number.

Self Diagnostic Result

Displays the diagnosis results judged by AFS control unit.

Work support

Sets each sensor.

Data monitor

Indicates AFS control unit input data in real time.

Active test

Provides the drive signal to the load. Checks operation.

Service item

Description

ST ANG SEN ADJUSTMENT

*

—

LEVELIZER ADJUSTMENT

Adjusts the height sensor signal output value (AFS control unit recognized) in the un-
loaded vehicle condition. 

Monitor item

[Unit]

Description

STR ANGLS SIG
[deg]

The steering angle value judged by the steering angle sensor signal received from 
the steering angle sensor with CAN communication

VHCL SPD
[km/h]

The vehicle speed signal value from the unified meter and A/C amp. with CAN com-
munication

SLCT LVR POSI
[P - 1]

The selector lever status judged by the position indicator signal received from TCM 
with CAN communication

HEAD LAMP
[On/Off]

The headlamp On/Off status judged by the low beam headlamp (ON) signal received 
from IPDM E/R with CAN communication

AFS SW
[On/Off]

The switch status input from AFS switch

HI SEN OTP RR
[V]

The height sensor signal voltage value input from the height sensor

LEV ACTR VLTG
[%]

The ratio value to the battery voltage generated by the levelizer activation signal con-
trol value judged by AFS control unit

SWVL SEN RH

*

[deg]

The head lamp swivel angle value judged by AFS control unit received from the swiv-
el position sensor signal input from the swivel actuator

SWVL SEN LH

*

[deg]

SWVL ANGLE RH

*

[deg]

The swivel angle command value to the swivel motor judged by AFS control unit

SWVL ANGLE LH

*

[deg]

DIAGNOSIS SYSTEM (AFS)

EXL-41

< FUNCTION DIAGNOSIS >

[XENON TYPE]

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NOTE:

“Fast” operation speed is as three times fast as “Slow”.

Test item

Operation Item

Description

LOW BEAM TEST RIGHT

Origin Fast

Swivels the right headlamp to the swivel angle 0

°

 in the normal speed.

Peak Fast

Swivels the right headlamp to the swivel angle approximately 20

°

 in the nor-

mal speed.

Origin Slow

Swivels the right headlamp to the swivel angle 0

°

 in the speed at the initial-

ization.

Peak Slow

Swivels the right headlamp to the swivel angle approximately 20

°

 in the 

speed at the initialization.

LOW BEAM TEST LEFT

Origin Fast

Swivels the left headlamp to the swivel angle 0

°

 in the normal speed.

Peak Fast

Swivels the left headlamp to the swivel angle approximately 20

°

 in the nor-

mal speed.

Origin Slow

Swivels the left headlamp to the swivel angle 0

°

 in the speed at the initializa-

tion.

Peak Slow

Swivels the left headlamp to the swivel angle approximately 20

°

 in the speed 

at the initialization.

LEVELIZER TEST

Origin

Changes the aiming motor drive signal to approximately 70% of the battery 
voltage. Moves the headlamp upward and downward.

Peak

Changes the aiming motor drive signal to approximately 15% of the battery 
voltage. Moves the headlamp upward and downward.

EXL-42

< COMPONENT DIAGNOSIS >

[XENON TYPE]

B2503, B2504 SWIVEL ACTUATOR

COMPONENT DIAGNOSIS

B2503, B2504 SWIVEL ACTUATOR

Description

INFOID:0000000001604619

SWIVEL ACTUATOR

The swivel actuator is installed in the headlamp unit. The swivel actuator consists of the swivel motor and the
swivel position sensor.

SWIVEL MOTOR

• The swivel motor is the two-phase step motor.
• The swivel motor drives headlamp by exciting the two drive coils according to the drive signal from AFS con-

trol unit. 

• The rotation direction of the swivel motor is changeable by changing the exciting pattern. 

SWIVEL POSITION SENSOR

The swivel position sensor detects the headlamp swivel angle to transmit the swivel position sensor signal to
AFS control unit.

DTC Logic

INFOID:0000000001604620

DTC DETECTION LOGIC

• [B2503] Swivel actuator [RH]
• [B2504] Swivel actuator [LH]

*: Initialization is not included.

DTC CONFIRMATION PROCEDURE

1.

DTC ERASE

Erase the DTC memory of AFS with CONSULT-III.

>> GO TO 2.

2.

CONFIRMATION DTC SELECTION

Select "B2503" or "B2504" for confirmation.

Which DTC is confirmation?

B2503 >> GO TO 3.
B2504 >> GO TO 4.

3.

DTC CONFIRMATION (B2503)

1.

Steer to the straight-forward position.

2.

Start the engine.

3.

Turn AFS OFF switch OFF.

4.

Turn the headlamp ON.

5.

Shift the selector lever to "N" (A/T models).

6.

Shift the shift knob to neutral (M/T models).

7.

Steer to the right. (Rotate it once or more.)

DTC detection condition

DTC erase

condition

Possible cause

AFS control unit indicates an applicable DTC when detecting any of the follow-
ing conditions continuously for 2 seconds or more. 
• AFS control unit-recognized swivel position differs extremely from the swivel 

position sensor-input value while the swivel operating.

*

• The swivel position sensor signal does not change even though AFS control 

unit transmits the swivel motor driving signal while the swivel operating

*

.

• The swivel motor short and open is detected while the swivel operating

*

.

• The swivel position sensor power supply is 6 V or more, or 4 V or less.
• The swivel position sensor signal is 0.25 V or less, or 4.75 V or more.

Ignition switch 
OFF

Swivel position sensor
• Swivel position sensor
• Harness and connector
• AFS control unit
Swivel motor
• Swivel  motor
• Harness and connector
• AFS control unit

B2503, B2504 SWIVEL ACTUATOR

EXL-43

< COMPONENT DIAGNOSIS >

[XENON TYPE]

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8.

Perform the self-diagnosis with CONSULT-III.

Is "B2503" detected?

YES

>> Refer to 

EXL-43, "Diagnosis Procedure"

. 

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

4.

DTC CONFIRMATION (B2504)

1.

Steer to the straight-forward position.

2.

Start the engine.

3.

Turn AFS OFF switch OFF.

4.

Turn the headlamp ON.

5.

Drive at 25 km/h (15.5 MPH) or more.

6.

Steer to the left. (Rotate it once or more.)

7.

Stop the vehicle.

8.

Perform the self-diagnosis with CONSULT-III.

Is "B2504" detected?

YES

>> Refer to 

EXL-43, "Diagnosis Procedure"

. 

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000001604621

1.

CHECK SWIVEL POSITION SENSOR SIGNAL INPUT

1.

Turn the ignition switch ON.

2.

Check the voltage between the AFS control unit harness connector and the ground.

Is the measurement value within the standard value?

YES

>> GO TO 2.

Less than the standard value >>GO TO 6.
Higher than the standard value>>GO TO 9.

2.

CHECK SWIVEL MOTOR

Check the swivel motor.

EXL-46, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the front combination lamp.

3.

CHECK SWIVEL MOTOR OPEN CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector and the headlamp swivel actuator connector.

3.

Check continuity between the AFS control unit harness connector and the headlamp swivel actuator har-
ness connector.

Terminals

Voltage

(Approx.)

(+)

(

−

)

AFS control unit

Ground

Connector

Terminal

RH

M16

9

0.25 - 4.75 V

LH

29

AFS control unit

Headlamp swivel

actuator

Continuity

Connector

Terminal

Connector

Terminal