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Nissan Maxima. Manual - part 746

HAC-160

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

BLOWER MOTOR

1. Turn ignition switch OFF.

2. Disconnect blower motor harness connector.

3. Check continuity between blower motor harness connector M31

terminal 4 and ground.

Is the inspection result normal?

YES

>> Replace blower motor. Refer to

VTL-16, "BLOWER

MOTOR : Removal and Installation"

>> Repair harness or connector.

10.

CHECK POWER SUPPLY OF THE FRONT BLOWER MOTOR RELAY

1. Turn the ignition switch OFF.

2. Remove the front blower motor relay.

3. Turn the ignition switch ON.

4. Check the voltage between front blower motor relay harness connector J-4 terminals 2, 3 and ground.

Is the inspection result normal?

YES

>> GO TO 11.

>> Repair harness or connector.

11.

CHECK FRONT BLOWER MOTOR RELAY GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between front blower motor relay harness connector J-4 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 12.

>> Repair harness or connector.

12.

CHECK BLOWER MOTOR SUPPLY CIRCUIT FOR OPEN

Check continuity between blower motor harness connector M31 terminal 4 and front blower motor relay har-

ness connector J-4 terminal 5.

Is the inspection result normal?

YES

>> Replace front blower motor relay.

>> Repair harness or connector.

4 - Ground

: Continuity should not exist.

AWIIA1158ZZ

2, 3 - Ground

: Battery voltage

1 - Ground

: Continuity should exist.

5 - 4

: Continuity should exist.

MAGNET CLUTCH

HAC-161

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

HAC

MAGNET CLUTCH

Description

INFOID:0000000010051164

SYSTEM DESCRIPTION

A/C auto amp. controls A/C compressor operation by ambient temperature and signal from ECM.

Low Temperature Protection Control

A/C auto amp. will turn the A/C compressor ON or OFF as deter-

mined by a signal detected by ambient sensor.

When ambient temperature is greater than 4

°C (39°F), the A/C com-

pressor turns ON. The A/C compressor turns OFF when ambient

temperature is less than 2.5

°C (37°F).

Component Function Check

INFOID:0000000010051165

FUNCTION INSPECTIONS

1. Press AUTO switch. AUTO is indicated on the display.

2. Press the A/C switch.

3. Check that the indicator of the A/C switch turns on. Check visually and by sound that the A/C compressor

is operating. (The discharge air temperature or fan speed varies depending on the ambient temperature,

in-vehicle temperature, and temperature setting.)

4. Press the A/C switch again.

5. Check that the indicator of the A/C switch turns OFF. Check visually and by sound that the A/C compres-

sor stops.

Does it operate normally?

YES

>> Inspection End.

>> Perform trouble diagnosis for the A/C compressor. Refer to

HAC-161, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000010051166

Regarding Wiring Diagram information, refer to

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

AWIIA1185GB

HAC-162

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

MAGNET CLUTCH

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

INSPECTION IN AUTO ACTIVE TEST MODE

Perform “AUTO ACTIVE TEST”. Refer to

PCS-11, "Diagnosis Description"

Does it operate normally?

YES

>> GO TO 6.

>> GO TO 2.

CHECK POWER SUPPLY FOR A/C COMPRESSOR

1. Turn ignition switch OFF.

2. Disconnect A/C compressor connector.

3. Start engine and press A/C switch.

4. Check voltage between A/C compressor harness connector F3 terminal 1 and ground.

Is the inspection result normal?

YES

Check magnet clutch coil.

1. If NG, replace magnet clutch. Refer to

HA-37, "Removal and Installation for Compressor"

2. If OK, check A/C compressor mounting points for looseness or corrosion and repair as neces-

sary.

>> GO TO 3

CHECK FUSE

Check 10A fuse (No. 41) located in IPDM E/R.

NOTE:

Refer to

PG-64, "Fuse, Connector and Terminal Arrangement"

for fuse location.

Is the inspection result normal?

YES

>> GO TO 4.

>> GO TO 5.

CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND A/C COMPRESSOR

1. Turn ignition switch OFF.

AWIIA1124GB

Terminal

Voltage (V)

(Approx.)

(+)

(-)

Connector - Terminal

Body ground

12V

F3-1

MAGNET CLUTCH

HAC-163

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

HAC

2. Disconnect IPDM E/R connector F10 and A/C compressor con-

nector F3.

3. Check continuity between A/C compressor harness connector

F3 (A) terminal 1 and IPDM E/R harness connector F10 (B) ter-

minal 48.

Is the inspection result normal?

YES

>> Replace A/C Relay.

>> Repair harness or connector.

CHECK A/C COMPRESSOR CIRCUIT FOR SHORT

Check continuity between A/C compressor harness connector F3

terminal 1 and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-35, "Removal and

Installation"

>> Repair harness or connector.

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"

HAC-134, "DTC Logic"

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to

HAC-171, "DTC Index"

>> GO TO 7.

CHECK A/C AUTO AMP. INPUT SIGNAL

Using CONSULT, check “On/Off” of “COMP REQ SIG” and “FAN REQ SIG” in “DATA MONITOR” of HVAC.

Refer to

HAC-129, "CONSULT Function"

Is the inspection result normal?

YES

>> GO TO 8.

>> Replace A/C auto amp. Refer to

HAC-203, "Removal and Installation"

CHECK REFRIGERANT PRESSURE SENSOR

Check refrigerant pressure sensor. Refer to

EC-515, "Component Function Check"

Is the inspection result normal?

YES

>> Inspection End.

>> Repair or replace malfunctioning parts.

1 - 48

: Continuity should exist.

AWIIA0622ZZ

1 - Ground

: Continuity should not exist.

AWIIA1168ZZ

A/C SWITCH ON

: COMP REQ SIG On

A/C SWITCH OFF

: COMP REQ SIG Off

FAN CONTROL DIAL ON

: FAN REQ SIG On

FAN CONTROL DIAL OFF

: FAN REQ SIG Off

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