Nissan Maxima. Manual — part 721
HAC-60
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Description
INFOID:0000000010051004
COMPONENT DESCRIPTION
A/C Auto Amp. (Air Conditioner Automatic Amplifier)
The A/C auto amp. (1) has a built-in microcomputer that processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor(s), the mode door motor, the
intake door motor, the blower motor and the compressor are then
controlled.
When the various switches and temperature control dial are oper-
ated, data is input to the A/C auto amp. from the AV control unit
using CAN communication.
The A/C auto amp. is operated with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into the A/C auto amp.
Power Supply and Ground Circuit for A/C Auto Amp.
A/C AUTO AMP. : Component Function Check
INFOID:0000000010051005
1.
CHECK OPERATION
1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
2. Operate the temperature control dial (driver side). Check that the fan speed or outlet changes. (The dis-
charge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-
ture, and temperature setting.)
Does it operate normally?
YES
>> Inspection End.
NO
>> Perform trouble diagnosis for the A/C system. Refer to
HAC-60, "A/C AUTO AMP. : Diagnosis
.
A/C AUTO AMP. : Diagnosis Procedure
INFOID:0000000010051006
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
.
1.
CHECK FOR AUDIO DTCS WITH CONSULT
Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of MULTI AV.
Are there any audio DTCs present?
YES
>> Go to audio DTC index. Refer to
(color display with bose audio system with-
(color display with bose audio system and navigation) or
(color display without bose audio system or navigation).
NO
>> GO TO 2.
ALIIA0319ZZ
JPIIA0617GB
POWER SUPPLY AND GROUND CIRCUIT
HAC-61
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
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2.
CHECK A/C AUTO AMP. POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. connector.
3. Turn ignition switch ON.
4. Check voltage between A/C auto amp. harness connector M37
terminal 17, 20, 40 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK FUSE
Check 10A fuses [Nos. 3, 6 and 17, located in the fuse block (J/B)].
NOTE:
.
Is the inspection result normal?
YES
>> Check harness for open circuit. Repair or replace if necessary.
NO
>> Check harness for short circuit. Repair or replace if necessary.
4.
CHECK A/C AUTO AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector
M37 terminals 19, 39 and ground.
Is the inspection result normal?
YES
>> Replace the A/C auto amp. Refer to
.
NO
>> Repair the harnesses or connectors.
A/C AND AV SWITCH ASSEMBLY
A/C AND AV SWITCH ASSEMBLY : Component Function Check
INFOID:0000000010051007
1.
CHECK OPERATION
1. Press the AUTO switch, and then check that “AUTO” is shown on the display.
2. Operate the temperature control dial (driver side). Check that the fan speed or outlet changes. (The dis-
charge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-
ture, and temperature setting.)
Does it operate normally?
YES
>> Inspection End.
NO
>> Perform trouble diagnosis for the A/C and AV switch assembly. Refer to
SWITCH ASSEMBLY : Diagnosis Procedure"
.
(+)
(
−)
Voltage
A/C auto amp.
—
Ignition switch position
Connector
Terminal
OFF
ACC
ON
M37
17
Ground
Approx. 0V
Battery
voltage
Battery
voltage
20
Approx. 0V
Approx. 0V
Battery
voltage
40
Battery
voltage
Battery
voltage
Battery
voltage
AWIIA1172ZZ
19, 39 - Ground
: Continuity should exist.
AWIIA1173ZZ
HAC-62
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
POWER SUPPLY AND GROUND CIRCUIT
A/C AND AV SWITCH ASSEMBLY : Diagnosis Procedure
INFOID:0000000010051008
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
.
1.
CHECK FOR AUDIO DTCS WITH CONSULT
Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of MULTI AV.
Are there any audio DTCs present?
YES
>> Go to audio DTC index. Refer to
(color display with bose audio system with-
(color display with bose audio system and navigation) or
(color display without bose audio system or navigation).
NO
>> GO TO 2.
2.
CHECK A/C AND AV SWITCH ASSEMBLY POWER SUPPLY
1. Disconnect the A/C and AV switch assembly connector.
2. Check voltage between A/C and AV switch assembly harness
connector M98 terminal 3 and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK FUSE
Check 10A fuse [No.17, located in the fuse block (J/B)].
NOTE:
.
Is the inspection result normal?
YES
>> Check harness for open circuit. Repair or replace if necessary.
NO
>> Check harness for short circuit. Repair or replace if necessary.
4.
CHECK A/C AND AV SWITCH ASSEMBLY GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C and AV switch assembly harness
connector M98 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace the A/C and AV switch assembly. Refer to
HAC-100, "Removal and Installation"
.
NO
>> Repair the harnesses or connectors.
(+)
(
−)
Voltage
A/C and AV switch
assembly
—
Ignition switch position
Connector
Terminal
OFF
ACC
ON
M98
3
Ground
Approx. 0V
Battery
voltage
Battery
voltage
AWIIA1190ZZ
1 - Ground
: Continuity should exist.
AWIIA1191ZZ
A/C AUTO AMP.
HAC-63
< ECU DIAGNOSIS INFORMATION >
[WITH COLOR DISPLAY]
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ECU DIAGNOSIS INFORMATION
A/C AUTO AMP.
Reference Value
INFOID:0000000010051009
VALUES ON THE DIAGNOSIS TOOL
CONSULT MONITOR ITEM
A/C AUTO AMP. HARNESS CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR A/C AUTO AMP.
Monitor item
Condition
Value/Status
COMP REQ SIG
Engine: Run at idle after
warming up
A/C switch: ON
(Compressor operation sta-
tus)
On
A/C switch: OFF
Off
FAN REQ SIG
Engine: Run at idle after
warming up
Blower fan: ON
On
Blower fan: OFF
Off
AMB TEMP SEN
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
IN-VEH TEMP
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
INT TEMP SEN
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
SUNLOAD SEN
Ignition switch ON
—
0 - 1395 w/m
2
(0 - 1200 kcal/m
2
·h)
AMB SEN CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
IN-VEH CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
INT TEMP CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
SUNL SEN CAL
Ignition switch ON
—
0 - 1395 w/m
2
(0 - 1200 kcal/m
2
·h)
FAN DUTY
Engine: Run at idle after
warming up
Blower fan: ON
25 - 85%
Blower fan: OFF
0%
XM
Ignition switch ON
—
−100 - 155
ENG COOL TEMP
Ignition switch ON
—
Values according to coolant
temperature
VEHICLE SPEED
Driving
—
Equivalent to speedometer
reading
AWIIA1381ZZ
Terminal
No.
Wire col-
or
Item
Ignition
switch
Condition
Value
(Approx.)
1
L
CAN-H
ON
—
0 - 5V
2
P
CAN-L
ON
—
0 - 5V
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