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

Procedure"

.  

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 

AV-437, "DTC Index"

 (color display with bose audio system with-

out navigation), 

AV-607, "DTC Index"

 (color display with bose audio system and navigation) or 

AV-

272, "DTC Index"

 (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:

Refer to 

PG-62, "Terminal Arrangement"

.

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 

HAC-100,

"Removal and Installation"

.

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 

HAC-62, "A/C AND AV

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 

AV-437, "DTC Index"

 (color display with bose audio system with-

out navigation), 

AV-607, "DTC Index"

 (color display with bose audio system and navigation) or 

AV-

272, "DTC Index"

 (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:

Refer to 

PG-62, "Terminal Arrangement"

.

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