control unit NISSAN NAVARA 2005 Repair User Guide

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT DESCRIPTION
Front Air Control
The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motors, mode door motor, intake door
motor, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
Self-diagnostic functions are also built into the front air control to pro-
vide quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
There are two PTCs (passenger and driver) built into the front air
control. They can be set at an interval of 0.5°C(1.0°F) in the 18°C
(60°F) to 32°C(90°F) temperature range by rotating the temperature
dial. The set temperature is displayed.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
MJIB0327E
MJIB0344E
MJIB0180E

TROUBLE DIAGNOSIS
ATC-65
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet as indicated by the
front air control. Motor rotation is conveyed to a link which activates
themodedoor.
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 92 is present. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function".
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect front air control connector and mode door motor
connector.
3. Check continuity between front air control harness connector
M60 terminal 1 and mode door motor harness connector M46
terminal 1 and between front air control harness connector M60
terminal 14 and mode door motor harness connector M46 termi-
nal 6.
OK or NG
OK >> Replace mode door motor.
NG >> Repair or replace harness as necessary.
MJIB0161E
1 - 1 : Continuity should exist.
14 - 6 : Continuity should exist.
MJIB0204E

ATC-70
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motors
The driver and passenger air mix door motors are attached to the
heater & cooling unit. These motors rotate so that the air mix door is
opened or closed to a position set by the front air control. Motor rota-
tion is then conveyed through a shaft and the air mix door position is
then fed back to the front air control by the PBR built into the air mix
door motors.
NOTE:
The illustrations for air mix door motors (driver and passenger) are
for LHD models. The layout for RHD models is symmetrically oppo-
site.
MJIB0162E
MJIB0163E

TROUBLE DIAGNOSIS
ATC-79
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 82 is present. Refer toAT C - 5 5 , "
A/C System Self-diagnosis Function".
YES or NO
YES >> GO TO 2.
NO >> Replace front air control. Refer toAT C - 11 6 , "
REMOVAL".
2.CHECK POWER SUPPLY CIRCUIT FOR INTAKE DOOR MOTOR
1. Turn ignition switch OFF.
2. Disconnect front air control connector and intake door motor
connector.
3. Check continuity between front air control harness connector
M60 terminal 5 and intake door motor harness connector M86
terminal 6 and between front air control harness connector M60
terminal 4 and intake door motor harness connector M86 termi-
nal 1.
OK or NG
OK >> Replace intake door motor. Refer toATC-129, "INTAKE
DOOR MOTOR".
NG >> Repair or replace harness as necessary.
MJIB0165E
5 - 6 Continuity should exist.
4 - 1 Continuity should exist.
MJIB0208E

ATC-82
TROUBLE DIAGNOSIS
Blower Speed Compensation - Sunload
When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low
speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower
operates at low speed. During high sunload conditions, the front air control causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control is located on the cooling unit. The vari-
able blower control receives a gate voltage from the front air control
to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
NOTE:
This illustration is for LHD models. The layout for RHD models is
symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
SYMPTOM: Blower motor operation is malfunctioning under starting
blower speed control.
WJIA0441E
MJIB0166E
MJIB0064E

ATC-114
TROUBLE DIAGNOSIS
Intake Sensor Circuit
EJS006BZ
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit. It converts
temperature of air after it passes through the evaporator into a resis-
tance value which is then input to the front air control.
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (56 or 57 is indi-
cated on front air control as a result of conducting Self-diagnosis.)
1.CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M82
terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector M82
terminal 1 and front air control harness connector M60 terminal
13.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
MJIB0173E
WJIA1156E
2 - Ground : Approx. 5V
WJIA1278E
1 - 13 : Continuity should exist.
WJIA1157E

ATC-116
CONTROL UNIT
CONTROL UNIT
PFP:27500
Removal and InstallationEJS006C0
REMOVAL
1. Remove cluster lid C. Refer toIP-11, "CLUSTER LID C".
2. Remove the four screws securing the front air control to cluster
lid C.
3. Remove the front air control.
INSTALLATION
Installation is in the reverse order of removal.
LBIA0416E

BLOWER MOTOR
ATC-121
C
D
E
F
G
H
I
K
L
MA
B
AT C
BLOWER MOTORPFP:27226
ComponentsEJS006C5
Removal and InstallationEJS006C6
REMOVAL
1. Remove the lower glove box assembly. Refer toIP-10, "Removal and Installation".
2. Disconnect the blower motor electrical connector.
3. Remove the three screws and remove the blower motor.
INSTALLATION
Installation is in the reverse order of removal.
1. Heater and cooling unit assembly 2. Blower motor 3. Variable blower control
MJIB0210E

ATC-122
AIR CONDITIONER FILTER
AIR CONDITIONER FILTER
PFP:27277
Removal and InstallationEJS006C7
FUNCTION
The air inside the passenger compartment is filtered by the air condi-
tioner filters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two air conditioner filters are located
in the heater and cooling unit assembly.
REPLACEMENT TIMING
Replacement of the two air conditioner filters is recommended on a regular interval depending on the driving
conditions. Refer toMA-8, "
PERIODIC MAINTENANCE". It may also be necessary to replace the two air con-
ditioner filters as part of a component replacement if the air conditioner filters are damaged.
REPLACEMENT PROCEDURE
1. Remove the RH lower dash side finisher. Refer toEI-33, "BODY SIDE TRIM".
2. Remove the front pillar lower finisher. Refer toEI-33, "
BODY SIDE TRIM".
3. Remove the lower glove box.
a. Remove the two lower glove box lower screws.
b. Open the lower glove box, then remove the two lower glove box
upper screws.
c. Disconnect the two upper clips and remove the lower glove box
from the instrument panel to access the air conditioner filter
cover.
4. Remove the screw and remove the air conditioner filter cover.
5. Remove the air conditioner filters from the heater and cooling
unit housing.
MJIB0215E
WLIA0023E
MJIB0216E

INTAKE DOOR MOTOR
ATC-129
C
D
E
F
G
H
I
K
L
MA
B
AT C
INTAKE DOOR MOTORPFP:27730
ComponentsEJS006CD
Intake Door Motor - Heater and Cooling Unit Assembly
NOTE:
This illustration is for LHD models. The layout for RHD models is symmetrically opposite.
Removal and InstallationEJS006DD
REMOVAL
1. Remove the heater and cooling unit assembly. Refer toATC-124, "HEATER&COOLING UNIT ASSEM-
BLY".
2. Remove the steering member from the heater and cooling unit assembly.
3. Disconnect the intake door motor electrical connector.
4. Remove the three screws and remove the intake door motor.
INSTALLATION
Installation is in the reverse order of removal.
1. Heater and cooling unit assembly 2. Intake door motor 3. Air mix door motor (driver)
4. Variable blower control 5. Air mix door motor (passenger) 6. Mode door motor
LBIA0415E