Infiniti QX56 (JA60). Manual - part 597

 

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Infiniti QX56 (JA60). Manual - part 597

 

 

DEFROSTER DOOR MOTOR CIRCUIT

HAC-45

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector.

3. Check continuity between A/C auto amp. harness connector

M50 terminal 28 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

8.

CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS

1. Turn ignition switch OFF.

2. Disconnect the A/C auto amp. harness connector.

3. Check continuity between A/C auto amp. harness connector

M50 (A) terminal 28 and M49 (B) terminal 3.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN

1. Disconnect the defroster door motor harness connector.

2. Check continuity between defroster door motor harness connec-

tor M144 (B) terminal 3, 2 and A/C auto amp. harness connector

M50 (A) terminal 28, and M49 (C) terminal 3.

Is the inspection result normal?

YES

>> Replace defroster door motor. Refer to 

VTL-26,

"Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

10.

CHECK PBR FEEDBACK VOLTAGE

1. Reconnect the A/C auto amp. harness connector.

2. Turn ignition switch ON.

3. Check voltage between A/C auto amp. harness connector M49

terminal 10 and ground while cycling defroster switch on and off.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND

Continuity should not exist.

AWIIA0119ZZ

Continuity should exist.

AWIIA0120ZZ

28 - 3

: Continuity should exist.

3 - 2

: Continuity should exist.

AWIIA0121ZZ

 Voltage

: Approx. 1V - 4.5V

AWIIA0157ZZ

HAC-46

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DEFROSTER DOOR MOTOR CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect A/C auto amp. harness connector.

3. Check continuity between A/C auto amp. harness connector

M49 terminal 10 and ground.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair or replace harness as necessary.

12.

CHECK PBR FEEDBACK CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the defroster door motor harness connector and A/C

auto amp. harness connector.

3. Check continuity between defroster door motor harness connec-

tor M144 (B) terminal 4 and A/C auto amp. harness connector

M49 (A) terminal 10

Is the inspection result normal?

YES

>> Replace defroster door motor. Refer to 

VTL-26,

"Removal and Installation"

.

NO

>> Repair or replace harness as necessary.

Continuity should not exist.

AWIIA0158ZZ

Continuity should exist.

AWIIA0159ZZ

BLOWER MOTOR CONTROL SYSTEM

HAC-47

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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BLOWER MOTOR CONTROL SYSTEM

System Description

INFOID:0000000005147700

SYSTEM DESCRIPTION

Component Parts

Blower speed control system components are:

• A/C auto amp.

• A/C and AV switch assembly

• Variable blower control

• Front blower motor relay

• Front blower motor

• In-vehicle sensor

• Ambient sensor

• Optical sensor

• Intake sensor

System Operation

Automatic Mode

In the automatic mode, the blower motor speed is calculated by the A/C auto amp. and variable blower control

based on input from the in-vehicle sensor, optical sensor, intake sensor and ambient sensor, and potentio tem-

perature control (PTC). 

When the air flow is increased, the blower motor speed is adjusted gradually to prevent a sudden increase in

air flow.

In addition to manual air flow control and the usual automatic air flow control, starting air flow control, low

water temperature starting control and high passenger compartment temperature starting control are avail-

able.

Starting Blower Speed Control

Start up from cold soak condition (Automatic mode).

In a cold start up condition where the engine coolant temperature is below 50

°C (122°F), the blower will not

operate at blower speed 1 for a short period of time (up to 210 seconds). The exact start delay time varies

depending on the ambient and engine coolant temperatures.

In the most extreme case (very low ambient temperature) the blower starting delay will be 210 seconds as

described above. After the coolant temperature reaches 50

°C (122°F), or the 210 seconds has elapsed, the

blower speed will increase to the objective blower speed.

Start up from usual operating or hot soak condition (Automatic mode).

The blower will begin operation momentarily after the AUTO switch is pushed. The blower speed will gradually

rise to the objective speed over a time period of 3 seconds or less (actual time depends on the objective

blower speed).

AWIIA0173GB

HAC-48

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

BLOWER MOTOR CONTROL SYSTEM

Blower Speed Compensation - Sunload

When the in-vehicle temperature and the set temperature are very close, the blower will be operating at low

speed. The speed will vary depending on the sunload. During conditions of low or no sunload, the blower

operates at low speed. During high sunload conditions, the A/C auto amp. causes the blower speed to

increase.

Blower Speed Control Specification

COMPONENT DESCRIPTION

Variable Blower Control

The variable blower control is located on the cooling unit. The vari-

able blower control receives a gate voltage from the A/C auto amp.

to steplessly maintain the blower motor voltage in the 0 to 5 volt

range (approx.).

Front Blower Motor Component Function Check

INFOID:0000000005147701

INSPECTION FLOW

1.

CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER

1. Push blower motor (+) switch. Blower motor should operate.

2. Push blower motor (+) switch and continue checking blower speed and fan symbol until all speeds are

checked.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Go to diagnosis procedure. Refer to 

HAC-48, "Front Blower Motor Diagnosis Procedure"

.

Front Blower Motor Diagnosis Procedure

INFOID:0000000005147702

Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

SYMPTOM: Blower motor operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR

WJIA0441E

WJIA0559E

 

 

 

 

 

 

 

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