2007 INFINITI M35 MOTOR

ACTIVE AFS
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Revision: 2007 April2007 M35/M45
HEADLAMP AUTO AIMING OPERATION
The height sensor detects a change in height of rear vehicle with ignition switch ON, and transmits signals to
the AFS control unit:
When ignition switch is turn to ON position, power is supplied

to height sensor terminal 1

through AFS control unit terminal 6.
When ignition switch is turned to ON position, height sensor input signal is supplied

to AFS control unit terminal 28

through height sensor terminal 2.
Ground is supplied

to height sensor terminal 3

through AFS control unit terminal 8.
Aiming motor driving signal (voltage signal that corresponds to the vehicle height) is transmitted depending on
the height sensor signal at the start of the engine

to front combination lamp LH terminal 12

through AFS control unit terminal 40,

to front combination lamp RH terminal 12

through AFS control unit terminal 19.
Output of aiming motor driving signal is maintained unless headlamp (HIGH/LOW) illuminate detected.
Auto aiming control operation starts when headlamps (HIGH/LOW) illuminate detected.
When headlamps (HIGH/LOW) illuminate, output of aiming motor driving signal is changed according to the
height sensor signal. After the change, it is changed according to height sensor signals with predetermined
timing based on driving condition while headlamps are ON.
Auto Aiming Operation
AFS control unit starts outputting aiming motor drive signal when the engine starts, and continues to output it
until the engine stops. Aiming motor drive signal changes output when the specified conditions described
below are met.
Headlamp aiming motors set the low beam projectors according to aiming motor drive signals received from
AFS control unit, both headlamp aiming motors cause the low beam projectors to move to the position com-
manded by the signal.
The aiming motor drive signal level retains when the following conditions are not met.

AFS control unit operation when the vehicle is stopped (low beam headlamps illuminated)
Headlamp aiming motor drive signal is changed when vehicle height is stabilized with a parked condition,
depending on the height sensor signal detected with height sensor signal by AFS control unit.

AFS control unit operation when the vehicle is running (low beam headlamps illuminated)
When vehicle is running, headlamp aiming motor drive signal is changed depending on the height sensor
signal which is detected when AFS control unit detects constant steady speed of vehicle.
When the vehicle is accelerating or decelerating, AFS control unit keeps headlamp aiming motor drive sig-
nal voltage level rather than changing it, so that the low beam projectors of both headlamps do not oper-
ate.
CAN COMMUNICATION SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN COMMUNICATION UNIT
Refer to LAN-50, "CAN System Specification Chart" .

LT-140
ACTIVE AFS
Revision: 2007 April2007 M35/M45
Component Parts DescriptionNKS003QG
AFS CONTROL UNIT
AFS control unit determines current vehicle conditions by received signals and controls AFS and headlamp
auto aiming.
SWIVEL ACTUATOR
Swivel actuator is configured with swivel motor and swivel position
sensor and is built in headlamps.

Swivel motor (step motor)
Swivel motor is a two−phase step motor. It is driven according to drive signals from AFS control unit when
two drive windings are energized in set sequences, and adjusts low beam projector of headlamp.
The direction of actuator rotation can be changed as desired by selecting appropriate energizing
sequences.

Swivel position sensor
Swivel position sensor detects swivel angle and transmits a swivel position sensor signal to the AFS con-
trol unit.
AIMING MOTOR
Aiming motor is installed outside the headlamps. Headlamp aiming
motors set the low beam projectors according to headlamp aiming
motor drive signals received from AFS control unit.
SKIB4688E
SKIB4690E
SKIB4688E

ACTIVE AFS
LT-149
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Terminals and Reference Values for AFS Control UnitNKS003QJ
Te r -
minal
No.Wire
colorItemMeasuring condition
Reference value
Ignition
switchOperation or condition
1 B/R IGN power supply ON — Battery voltage
2W/RSwivel position sensor ground
(right)ON — Approx. 0 V
3 GR AFS switch signal ON AFS switchON Approx. 0 V
OFF Battery voltage
4YSwivel position sensor power
supply (right)ON — Approx. 5 V
6 V/W Height sensor power supply ON — Approx. 5 V
7 P CAN-L — — —
8 B/R Height sensor ground ON — Approx. 0 V
9W/BSwivel position sensor signal
(right)ONLow beam headlamp
(right) swivel angle0°Approx. 1.5 V
Maximum
angleApprox. 2.5 V
11 R Swivel motor 1 phase− (right) ON
Low beam headlamp
(right) swivelONReference waveform
Approx. 8 - 12 V
13 B Swivel motor 2 phase− (right) ON OFF Approx. 9.5 - 11.5 V
15 BR/L Swivel motor 1 phase+ (left) ON
Low beam headlamp
(left) swivelONReference waveform
Approx. 8 - 12 V
17 Y/G Swivel motor 2 phase+ (left) ON OFF Approx. 9.5 - 11.5 V
19 V Aiming motor drive signal (right) ONLow beam headlamp
(right) auto aimingUnloaded
vehicle posi-
tionApprox. 9 V
Maximum
laden condi-
tion Approx. 4.8 V
(With 18- inch wheel)
Approx. 5.2 V
(With 19 -inch wheel)
24 V/RSwivel position sensor power
supply (left)ON — Approx. 5 V
25 B Ground ON — Approx. 0 V
27 R/WSwivel position sensor ground
(left)ON — Approx. 0 V
SKIB2408J
SKIB2408J

LT-150
ACTIVE AFS
Revision: 2007 April2007 M35/M45
28 BR Height sensor signal ON Vehicle heightUnloaded
vehicle posi-
tionApprox. 2.5 V
Maximum
laden condi-
tion Approx. 1.0 V
(With 18- inch wheel)
Approx. 1.3 V
(With 19- inch wheel)
29 L/YSwivel position sensor signal
(left)ONLow beam headlamp
(left) swivel angle0°Approx. 1.5 V
Maximum
angleApprox. 3.5 V
30 L CAN-H — — —
32 W Swivel motor 2 phase+ (right) ON
Low beam headlamp
(right) swivelONReference waveform
Approx. 8 - 12 V
34 G Swivel motor 1phase+ (right) ON OFF Approx. 9.5 - 11.5V
36 Y/L Swivel motor 2 phase− (left) ON
Low beam headlamp
(left) swivelONReference waveform
Approx. 8 - 12 V
38 W/L Swivel motor 1 phase− (left) ON OFF Approx. 9.5 - 11.5 V
40 O Aiming motor drive signal (left) ONLow beam headlamp
(left) auto aimingUnloaded
vehicle posi-
tionApprox. 9 V
Maximum
laden condi-
tion Approx. 4.8 V
(With 18 -inch wheel)
Approx. 5.2 V
(With 19 -inch wheel) Te r -
minal
No.Wire
colorItemMeasuring condition
Reference value
Ignition
switchOperation or condition
SKIB2408J
SKIB2408J

ACTIVE AFS
LT-153
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Turn ignition switch OFF not to change the vehicle height. Then turn ignition switch ON and per-
form levelizer adjustment again.

When “ADJUSTMENT COMPLETE” is displayed, and “NO DTC IS DETECTED” is displayed on
self-diagnosis results, levelizer adjustment is completed.

When “ADJUSTMENT COMPLETE” is displayed, and “B2514 HI SEN UNUSUAL” is displayed on
self-diagnosis results, refer to LT- 1 7 5 , "
DTC B2514 HI SEN UNUSUAL RR" .
7. Touch “END”.
8. Turn ignition switch OFF.
SELF-DIAG RESULTS
Operation Procedure
1. Touch “ADAPTIVE LIGHT” on “SELECT SYSTEM” screen.
2. Touch “SELF-DIAG RESULTS” on the “SELECT DIAG MODE” screen.
3. Check display content in self-diagnostic results.
CAUTION:
DTC B2503 and B2504 cannot be detected before the swivel operation. Thus, perform swivel operation
first, and then check the display in self-diagnostic results.
Description of DTC and Solutions after Detection
CONSULT-II can detect DTC (Diagnosis trouble code). The descriptions and solutions of DTC are listed
below.
Details of
error
indication
detected by
CONSULT-
IIConditions of error detectionFail-safe
1. Swivel operation
2. Auto aiming operation
3. AFS OFF indicator operation
4. CancellationReference
CAN
COMM CIR-
CUIT
[U1000]Any of several items below have errors.

TRANSMIT DIAG

Reception from ECM

Reception from unified meter and A/C amp.

Reception from TCM

Reception from steering angle sensor

Reception from IPDM E/R1. Stop the swivel motor RH and
LH when the malfunction
occurred.
2. Stop the aiming motors when the
malfunction occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.LAN-50, "
CAN
System Speci-
fication Chart".
CONTROL
UNIT (CAN)
[U1010]AFS control unit malfunctions.1. Stop the swivel motor RH and
LH when the malfunction
occurred.
2. Stop aiming motors when the
malfunction occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.Replace
AFS control
unit. LT-192

LT-154
ACTIVE AFS
Revision: 2007 April2007 M35/M45
SWIVEL
ACTUATOR
[RH]
[B2503]Any of several statuses below

Large difference between swivel motor drive signal (swivel
angle command signal) transmitted by AFS control unit and
swivel position sensor signal (swivel angle feed back signal)
by swivel position sensor exists for 2 seconds or longer. Or
swivel position sensor signal does not change for 2 seconds
or longer even when AFS control unit transmit swivel motor
drive signal.
CAUTION:
Detects when swivel operating (excludes initialization).

Short or open circuit exists for 2 seconds or longer on one of
swivel motor circuits (AFS control unit terminals 11, 13, 32 or
34).
CAUTION:
Detects when swivel operating (excludes initialization).

Voltage of swivel position sensor power supply (AFS control
unit terminal 4) had more than 6 V or had less than 4 V for 2
seconds or longer.

Voltage of swivel position sensor signal (AFS control unit ter-
minal 9) had more than 4.75 V or had less than 0.25 V for 2
seconds or longer.1. Stop the swivel motor RH and
LH when the malfunction
occurred.
2. Reduce approx. 2 V of the aim-
ing motor drive signal value from
that of when error is detected.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.LT- 1 6 1 , "
DTC
B2503
SWIVEL
ACTUATOR
RH"
SWIVEL
ACTUATOR
[LH]
[B2504]Any of several statuses below

Large difference between swivel motor drive signal (swivel
angle command signal) transmitted by AFS control unit and
swivel position sensor signal (swivel angle feed back signal)
by swivel position sensor exists for 2 seconds or longer. Or
swivel position sensor signal does not change for 2 seconds
or longer even when AFS control unit transmit swivel motor
drive signal.
CAUTION:
Detects when swivel operating (excludes initialization).

Short or open circuit exists for 2 seconds or longer on one of
swivel motor circuits (AFS control unit terminals 15, 17, 36 or
38).
CAUTION:
Detects when swivel operating (excludes initialization).

Voltage of swivel position sensor power supply (AFS control
unit terminal 24) had more than 6 V or had less than 4 V for 2
seconds or longer.

Voltage of swivel position sensor signal (AFS control unit ter-
minal 29) had more than 4.75 V or had less than 0.25 V for 2
seconds or longer.1. Stop the swivel motor RH and
LH when the malfunction
occurred.
2. Reduce approx. 2 V of the aim-
ing motor drive signal value from
that of when error is detected.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.LT- 1 6 8 , "
DTC
B2504
SWIVEL
ACTUATOR
LH"
HI SEN
UNUSUAL
[RR]
[B2514]Any of several statuses below
Voltage of height sensor power supply (AFS control unit termi-
nal 6) had more than 6 V or had less than 4 V for 2 seconds or
longer.

Voltage of height sensor signal (AFS control unit terminal 28)
had more than 4.75 V or had less than 0.25 V for 2 seconds or
longer.1. Normal operation
2. Stop aiming motors when the
malfunction occurred.
3. Remains OFF.
4. Turn ignition switch OFF.LT- 1 7 5 , "
DTC
B2514 HI SEN
UNUSUAL
RR"
Details of
error
indication
detected by
CONSULT-
IIConditions of error detectionFail-safe
1. Swivel operation
2. Auto aiming operation
3. AFS OFF indicator operation
4. CancellationReference

ACTIVE AFS
LT-155
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ST ANG
SEN SIG
[B2515]Any of several statuses below
Cannot receive steering angle sensor signal.

Receives steering angle sensor error.

Receives steering angle sensor signal except −943° to +943°.1. Back to the initial position.
2. Normal operation
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.BRC-24, "
Self-
Diagnosis".
If above sys-
tem is normal,
replace AFS
control unit.
SHIFT SIG
[P, R]
[B2516]Cannot receive A/T position indicator signal.1. Back to the initial position.
2. Normal operation
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.AT- 9 2 , "
SELF-
DIAGNOSTIC
RESULT
MODE".
If above sys-
tem is normal,
replace AFS
control unit.
VEHICLE
SPEED SIG
[B2517]Cannot receive vehicle speed signal.1. Back to the initial position.
2. Stop when the malfunction
occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.DI-31, "
SELF-
DIAG
RESULTS".
If above sys-
tem is normal,
replace AFS
control unit.
HEAD
LAMP SIG
[B2518]Cannot receive low beam status signal.1. Back to the initial position.
2. Stop aiming motors when the
malfunction occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.PG-20,
"SELF-DIAG
RESULTS".
If above sys-
tem is normal,
replace AFS
control unit.
LEVEL-
IZER CALIB
[B2519]Cannot recognize height sensor signal value at unloaded vehicle
position.1. Normal operation
2. Stop aiming motors when the
malfunction occurred.
3. Remains OFF.
4. When levelizer adjustment is
completedLT-152,
"WORK SUP-
PORT (LEV-
ELIZER
ADJUST-
MENT)"
ST ANGLE
SEN CALIB
[B2520]Cannot recognize steering angle sensor neutral point (straight-
ahead position).1. Back to the initial position.
2. Normal operation
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. When steering angle sensor
adjustment is completedBRC-6, "Adjustment of
Steering Angle
Sensor Neu-
tral Position". Details of
error
indication
detected by
CONSULT-
IIConditions of error detectionFail-safe
1. Swivel operation
2. Auto aiming operation
3. AFS OFF indicator operation
4. CancellationReference

LT-156
ACTIVE AFS
Revision: 2007 April2007 M35/M45
CAUTION:

If DTC relating to CAN communication [U1000] and other components are displayed at the same
time, diagnose CAN communication first.

Make sure of the normal operation after the parts (except AFS control unit) replacement according
to the self-diagnosis results. Delete the malfunction history.
Display Results

0: There is malfunction now.

1 – 39: Displays when it is normal at present and finds malfunction in the past. It increases in order
of 0→1→2...38→39 after returning to the normal condition whenever IGN OFF→ON. If it is over 39,
it is fixed to 39 until the self-diagnostic results are erased. It returns to 0 when malfunction is
detected again in the process.
ECU CIRC
[B2521]Any of several statuses below

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) or ground of swivel position sensor (RH) power
supply (AFS control unit terminal 4).

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) of swivel position sensor (RH) signal (AFS con-
trol unit terminal 9).

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) or ground of swivel position sensor (LH) power
supply (AFS control unit terminal 24).

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) of swivel position sensor (LH) signal (AFS con-
trol unit terminal 29).

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) or ground of height sensor power supply (AFS
control unit terminal 6).

Short circuit exists for 2 seconds or longer on power supply
(approx. 12 V) of height sensor signal (AFS control unit termi-
nal 28).

AFS control unit (RAM/ROM) malfunctions.1. Stop the swivel motor RH and
LH when the malfunction
occurred.
2. Stop aiming motors when the
malfunction occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.LT- 1 7 9 , "
DTC
B2521 ECU
CIRC"
ECM SIG
[B2522]Cannot receive engine speed signal.1. Back to the initial position.
2. Stop when the malfunction
occurred.
3. Flash at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.EC-126,
"SELF-DIAG
RESULTS
MODE".
If above sys-
tem is normal,
replace AFS
control unit.
AFS SIG
[B2523]Cannot transmit AFS off indicator signal.1. Back to the initial position.
2. Normal operation
3. Flashes at intervals of approx. 1
second when keeping error state
for 2 seconds or longer.
4. Turn ignition switch OFF.Replace
AFS control
unit LT- 1 9 2
Details of
error
indication
detected by
CONSULT-
IIConditions of error detectionFail-safe
1. Swivel operation
2. Auto aiming operation
3. AFS OFF indicator operation
4. CancellationReference