Nissan Maxima. Manual - part 747

 

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Nissan Maxima. Manual - part 747

 

 

HAC-164

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT

A/C SWITCH ASSEMBLY SIGNAL CIRCUIT

Diagnosis Procedure

INFOID:0000000010051167

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2. Check if any DTC No. is displayed in the self-diagnosis results. 

NOTE:

If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to 

HAC-171, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK RX (A/C SWITCH ASSEMBLY 

→ A/C AUTO AMP.) CIRCUIT CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect the A/C switch assembly and the A/C auto amp.

connectors.

3. Check continuity between A/C switch assembly harness con-

nector M104 (A) terminal 4 and A/C auto amp. harness connec-

tor M37 (B) terminal 7. 

4. Check continuity between A/C switch assembly harness con-

nector M104 (A) terminal 4 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK TX (A/C AUTO AMP. 

→ A/C SWITCH ASSEMBLY) CIRCUIT CONTINUITY

1. Check continuity between A/C switch assembly harness con-

nector M104 (A) terminal 3 and A/C auto amp. harness connec-

tor M37 (B) terminal 6. 

2. Check continuity between A/C switch assembly harness con-

nector M104 (A) terminal 3 and ground. 

Is the inspection result normal?

YES

>> Perform trouble diagnosis for the A/C switch assembly.

Refer to 

HAC-166, "A/C SWITCH ASSEMBLY : Diagnosis Procedure"

. 

NO

>> Repair harness or connector.

4 - 7

: Continuity should exist.

4 - Ground

: Continuity should not exist.

AWIIA1177ZZ

3 - 6

: Continuity should exist.

3 - Ground

: Continuity should not exist.

AWIIA1178ZZ

POWER SUPPLY AND GROUND CIRCUIT

HAC-165

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.
A/C AUTO AMP. : Description

INFOID:0000000010051168

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 A/C compressor are

then controlled.

When the various switches and temperature control switches are

operated, data is input to the A/C auto amp. from the AV switch

assembly 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:0000000010051169

1.

CHECK OPERATION

1. Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The

discharge 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-165, "A/C AUTO AMP. : Diagnosis

Procedure"

.  

A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000010051170

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK A/C AUTO AMP. POWER SUPPLY

ALIIA0319ZZ

JPIIA0617GB

HAC-166

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

POWER SUPPLY AND GROUND CIRCUIT

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

terminals 17, 20, 40 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

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. 

3.

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-203,

"Removal and Installation"

.

NO

>> Repair the harnesses or connectors.

A/C SWITCH ASSEMBLY
A/C SWITCH ASSEMBLY : Component Function Check

INFOID:0000000010051171

1.

CHECK OPERATION

1. Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2. Operate the temperature control switch (driver side). Check that the fan speed or outlet changes. (The

discharge 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 switch assembly. Refer to 

HAC-166, "A/C SWITCH

ASSEMBLY : Diagnosis Procedure"

.  

A/C SWITCH ASSEMBLY : Diagnosis Procedure

INFOID:0000000010051172

(+)

(

−)

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

POWER SUPPLY AND GROUND CIRCUIT

HAC-167

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

1. Disconnect the A/C switch assembly connector. 

2. Turn ignition switch ON. 

3. Check voltage between A/C switch assembly harness connector

M104 terminal 1 and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

Check 10A fuse [No.3, 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.  

3.

CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between A/C switch assembly harness con-

nector M104 terminal 2 and ground. 

Is the inspection result normal?

YES

>> Replace the A/C switch assembly. Refer to 

HAC-203,

"Removal and Installation"

.

NO

>> Repair the harnesses or connectors.

A/C DISPLAY UNIT
A/C DISPLAY UNIT : Diagnosis Procedure

INFOID:0000000010051173

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK A/C DISPLAY UNIT POWER SUPPLY CIRCUIT

(+)

(

−)

Voltage

A/C switch assembly

—

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M104

1

Ground

Approx. 0V

Approx. 0V

Battery 
voltage

AWIIA1179ZZ

2 - Ground

: Continuity should exist.

AWIIA1180ZZ

 

 

 

 

 

 

 

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