Nissan Titan A60. Instruction — part 596
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
HAC-67
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
Component Description
INFOID:0000000006164719
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 (driver and passenger) 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.
Front Air Control Component Function Check
INFOID:0000000006164720
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - AUTO MODE
1. Press AUTO switch.
2. Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle and set temperatures.)
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-67, "Front Air Control Power and Ground Diagnosis
.
Front Air Control Power and Ground Diagnosis Procedure
INFOID:0000000006164721
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
AWIIA0551ZZ
AWIIA0938ZZ
HAC-68
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
POWER SUPPLY AND GROUND CIRCUIT FOR CONTROLLER
SYMPTOM: A/C system does not come on.
1.
CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL
1. Turn ignition switch ON.
2. Check voltage between front air control harness connector M49
(B) terminal 15 and M50 (A) terminal 27, and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check 10A fuses [Nos. 8 and 19, located in the fuse block (J/B)]. Refer to
.
• If fuses are OK, check harness for open circuit. Repair or replace as necessary.
• If fuses are NG, replace fuse and check harness for short circuit. Repair or replace as neces-
sary.
2.
CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connectors.
3. Check continuity between front air control harness connector
M50 terminal 35 and ground.
Is the inspection result normal?
OK
>> Replace front air control. Refer to
NG
>> Repair harness or connector.
AWIIA0438GB
Terminals
Ignition switch position
(+)
(-)
OFF
ACC
ON
front air
control
connector
Terminal No.
M49
15
Ground
Approx. 0V
Approx. 0V
Battery
voltage
M50
27
Battery
voltage
Battery
voltage
Battery
voltage
AWIIA1073ZZ
35 - Ground
: Continuity should exist.
AWIIA0440ZZ
AIR CONDITIONER CONTROL
HAC-69
< ECU DIAGNOSIS INFORMATION >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
ECU DIAGNOSIS INFORMATION
AIR CONDITIONER CONTROL
Front Air Control Terminals Reference Values
INFOID:0000000006164722
Measure voltage between each terminal and ground by following
Terminals and Reference Value for front air control (1).
FRONT AIR CONTROL HARNESS CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR FRONT AIR CONTROL
AWIIA0436ZZ
AWIIA0441ZZ
Terminal
No.
Wire
color
Item
Ignition
switch
Condition
Voltage (V)
(Approx.)
1
G/O
Optical sensor (driver)
ON
-
0 - 5V
2
L
Air mix door motor (passenger) CCW
ON
-
Battery voltage
3
P
V ref ACTR (ground)
ON
-
5V
4
W/R
Compressor ON signal
ON
A/C switch OFF
5V
ON
A/C switch ON
0V
5
L/R
Fan ON signal
ON
Blower switch OFF
5V
ON
Blower switch ON
0V
6
SB
Air mix door motor (driver) feedback
ON
-
0 - 5V
7
GR
Mode door motor feedback
ON
-
0 - 5V
8
R/L
Illumination +
ON
Park lamps ON
Battery voltage
9
BR
Illumination -
-
Park lamps ON
10
LG/B
Defroster door motor feedback
ON
-
0 - 5V
11
L/B
Intake sensor
ON
-
0 - 5V
13
G/R
Variable blower control
ON
-
0 - 5V
14
G/W
Air mix door motor (passenger) CW
ON
Clockwise rotation
Battery voltage
PIIA2344E
HAC-70
< ECU DIAGNOSIS INFORMATION >
[AUTOMATIC AIR CONDITIONER]
AIR CONDITIONER CONTROL
*1: If equipped
15
Y/G
Power supply for IGN
ON
-
Battery voltage
16
Y/B
Rear Defogger request *1
ON
Battery voltage
17
W/G
Air mix door motor (driver) CW
ON
Clockwise rotation
Battery voltage
18
G
Air mix door motor (driver) CCW
ON
Counterclockwise rotation
Battery voltage
19
BR/W
Mode door motor CW
ON
Clockwise rotation
Battery voltage
20
P/L
Mode door motor CCW
ON
Counterclockwise rotation
Battery voltage
21
G/B
Intake door motor CCW
ON
Counterclockwise rotation
Battery voltage
22
O
Intake door motor CW
ON
Clockwise rotation
Battery voltage
23
LG
Defroster door motor CW
ON
Clockwise rotation
Battery voltage
24
P/B
Defroster door motor CCW
ON
Counterclockwise rotation
Battery voltage
25
P
Ambient sensor
ON
-
0 - 5V
26
V/R
Sensor ground
ON
-
0V
27
Y/R
Power supply for BAT
-
-
Battery voltage
28
Y
V ref ACTR (5V)
ON
-
0 - 5V
29
R/W
Air mix door motor (passenger) feed-
back
ON
-
0 - 5V
31
BR/Y
In-vehicle sensor motor (+)
ON
-
Battery voltage
32
LG/R
In-vehicle sensor signal
ON
-
0 - 5V
35
B
Ground
-
-
0V
36
P
CAN-L
ON
-
0 - 5V
37
L
CAN-H
ON
-
0 - 5V
38
W/V
Optical sensor (passenger)
ON
-
0 - 5V
41
Y/L
Water valve
ON
Water valve open
Battery voltage
Water valve closed
0V
42
W/G
Water valve
ON
Water valve open
0V
Water valve closed
Battery voltage
Terminal
No.
Wire
color
Item
Ignition
switch
Condition
Voltage (V)
(Approx.)
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