NISSAN PRIMERA 1999 Electronic Repair Manual

MODELS AFTER VIN - P11U0548750
YEL834C
HEADLAMP—Headlamp Aiming Control (Manual)—
Wiring Diagram—H/AIM—(Cont’d)
EL-89

YEL835C
HEADLAMP—Headlamp Aiming Control (Manual)—
Wiring Diagram—H/AIM—(Cont’d)
EL-90

System Description
The auto level control unit is designed to adjust the beam angle of the headlamp in response to the load-
ing conditions of the vehicle. It is not designed to compensate for the dynamic handling of the vehicle.
The vehicle’s front and rear height is measured by sensors attached to the front stabilizer bar and the rear
suspension lateral link arm. The sensors provide a signal to the auto level control unit, which calculates the
correct headlamp aiming position and sends a signal to the aiming motors.
Initialisation
After the replacement or adjustment of any suspension sensor, the system must be self calibrated. This is
achieved as follows.
The vehicle must be empty, since any load will result in an invalid calibration. From outside of the vehicle
turn ignition on and then within 7 seconds the light switch must be turned from off to side lights on position,
5 times, finishing with the lamps in the on position.
The headlamps will then move to the highest, then the lowest then the normal position to indicate that the
calibration is successful, as can be seen by the moving beam pattern.
After successful calibration the headlamps must then be aimed in the conventional manner. Refer to EL-70.
HEADLAMP—Headlamp Aiming Control (Auto)—
EL-91

Component Parts and Harness
Connector Location
NEL528
Auto level control unit
Rear sensor
Headlamp aiming motor RH
Front sensor
Headlamp aiming motor LH
Rear sensor
Auto level control unit Front sensor Headlamp
aiming motor
HEADLAMP—Headlamp Aiming Control (Auto)—
EL-92

Wiring Diagram—H/AIM—
AUTO
YEL836C
HEADLAMP—Headlamp Aiming Control (Auto)—
EL-93

YEL837C
HEADLAMP—Headlamp Aiming Control (Auto)—
Wiring Diagram—H/AIM—(Cont’d)
EL-94

Trouble Diagnosis
PERFORMING SELF-DIAGNOSIS
Check headlamp aiming control (auto) system using a bulb as
follows:
1. Connect a bulb 1.2W or 2W between auto level control unit
connector terminal

1and
5.
NOTE:
Do not use another bulb. This will damage the auto level
control unit. Use a 1.2W or 2W bulb only.
2. After turning the ignition switch from“OFF”to“ON”, the bulb
operates.
3. Compare the bulb operation to the chart below.
NEL530
Auto level control unitBulb (1.2 W or 2 W only)
HEADLAMP—Headlamp Aiming Control (Auto)—
EL-95

Lighting condition of the bulb System condition Reference item
NEL531 IGN ON
ON
OFF1 sec.
No malfunction is detected.
No further action is neces-
sary.
—
NEL532 IGN ON
ON
OFF1 sec.2 sec. 2 sec.
0.5 sec.
Front sensor or front sensor
circuit is malfunctioning.
(When rear sensor OK)Go to DIAGNOSTIC
PROCEDURE 1
(EL-97).
NEL533 IGN ON
ON
OFF1 sec.2 sec. 2 sec.
0.5 sec. 0.5 sec.
Rear sensor or rear sensor
circuit is malfunctioning.
(Whatever the state of front
sensor)Go to DIAGNOSTIC
PROCEDURE 2
(EL-97).
NEL534 IGN ON
ON
OFF1 sec.2 sec. 2 sec.
0.5 sec. 0.5 sec.
Sensor supply is malfunction-
ing.Go to DIAGNOSTIC
PROCEDURE 1 and
2 (EL-97).
NEL535 IGN ON
ON
OFF1 sec.2 sec. 2 sec.
0.5 sec. 0.5 sec.
Aiming motor or aiming motor
circuit is malfunctioning.Go to DIAGNOSTIC
PROCEDURE 3
(EL-98).
NEL536 IGN ON
ON
OFF
Auto level control unit is mal-
functioning.Replace auto level
control unit.
HEADLAMP—Headlamp Aiming Control (Auto)—
Trouble Diagnosis (Cont’d)
EL-96

DIAGNOSTIC PROCEDURE 1
(Front sensor check)
1) Disconnect control unit and front
sensor connector.
2) Check harness continuity between
control unit and front sensor.
Continuity should exist.
OK
NG
Check harness between
control unit and front
sensor.
1) Remove sensor.
2) Check front sensor linkage opera-
tion.
OK
NG
Replace sensor linkage.
Replace front sensor.
DIAGNOSTIC PROCEDURE 2
(Rear sensor check)
1) Disconnect control unit and rear
sensor connector.
2) Check harness continuity between
control unit and rear sensor.
Continuity should exist.
OK
NG
Check harness between
control unit and rear sen-
sor.
1) Remove the sensor.
2) Check rear sensor linkage opera-
tion.
OK
NG
Replace sensor linkage.
Replace rear sensor.
NEL537
Auto leveling control
unitB123Front sensorB131
NEL538
Auto leveling control
unitB123Rear sensor
B133




HEADLAMP—Headlamp Aiming Control (Auto)—
Trouble Diagnosis (Cont’d)
EL-97

DIAGNOSTIC PROCEDURE 3
(Aiming motor check)
CHECK POWER SUPPLY
1) Turn lighting switch to 2nd position.
2) Check voltage between aiming
motor terminal

3and ground.
Battery voltage should exist.
OK
NG
Check harness between
combination switch and
aiming motor.
CHECK GROUND CIRCUIT
1) Turn lighting switch to OFF position.
2) Check continuity between aiming
motor terminal

1and ground.
Continuity should exist.
OK
NG
Check harness between
aiming motor and
ground.
1) Disconnect control unit and aiming
motor connector.
2) Check harness continuity between
control unit terminal

4and aiming
motor terminal

2.
Continuity should exist.
OK
NG
Check harness between
control unit and aiming
motor.
Replace aiming motor.
YEL618B
Headlamp
aiming motor
Lighting switch
“2nd”
NEL540
Headlamp aiming
motor
LH:E4RH:E33
NEL541
Auto leveling control
unitB123Headlamp aiming
motor
LH:E4RH:E33



HEADLAMP—Headlamp Aiming Control (Auto)—
Trouble Diagnosis (Cont’d)
EL-98