Infiniti QX56 (JA60). Manual - part 600

BLOWER MOTOR CONTROL SYSTEM

HAC-57

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[AUTOMATIC AIR CONDITIONER]

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1. Disconnect A/C auto amp. connector.

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

M50 (A) terminal 47 and rear air control (rear) harness connec-

tor R209 (B) terminal 5.

Is the inspection results normal?

YES

>> Replace A/C auto amp. Refer to 

VTL-7, "Removal and

Installation"

.

NO

>> Repair harness or connector.

Rear Blower Motor Component Inspection 

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COMPONENT INSPECTION

Rear Blower Motor Relay

Check circuit continuity between terminals by supplying 12 volts and

ground to coil side terminals of relays.

Rear Blower Motor

Check that there are no foreign particles inside the intake unit.

Apply 12 volts to terminal 2 and ground to terminal 1 and ensure that

the blower motor rotates freely and quietly.

Continuity should exist.

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HAC-58

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[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

REAR AIR CONTROL SYSTEM

Rear Air Control System Description

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SYSTEM DESCRIPTION

Component Parts

Rear air control system components are:

• A/C auto amp.

• Rear air control (front)

• Rear air control (rear)

• Air mix door motor (rear)

• Mode door motor (rear)

System Operation

Rear Air Control

When the REAR CTRL indicator is off the rear air control (front) will control all rear blower motor speeds and

the rear temperature and mode operations. When the REAR CTRL switch is pressed (indicator on), the rear

air control (rear) will control all the rear blower motor speeds and the rear temperature and mode operations.

Rear Air Control Component Function Check

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SYMPTOM:

• Temperature cannot be adjusted from the rear air controls.

• Mode cannot be adjusted from the rear air controls.

INSPECTION FLOW

1.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 2.

2.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (FRONT) AIR MIX DOOR MOTOR OP-

ERATIONAL CHECK 

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REAR AIR CONTROL SYSTEM

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[AUTOMATIC AIR CONDITIONER]

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1. Start and run engine to operating temperature.

2. Turn the rear blower motor to maximum speed from the rear air control (front).

3. Turn rear air control (front) temperature control dial clockwise and then counterclockwise (REAR CTRL

indicator off).

4. Check for hot air at rear discharge air outlets in the maximum heat position and cold air at discharge air

outlets in the maximum cold position.

 Does the rear air control (front) operate properly?

YES

>> GO TO 3.

NO

>> Check rear air control (front). Refer to 

HAC-59, "Air Mix Door Motor (Rear) Diagnosis Procedure"

.

3.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) AIR MIX DOOR MOTOR OPER-

ATIONAL CHECK

1. Press the REAR CTRL switch on rear air control (front) to send control to the rear air control (rear).

2. Turn rear air control (rear) temperature control dial slowly clockwise and then counterclockwise (REAR

CTRL indicator on).

3. Check for hot air at rear discharge air outlets in the maximum heat position and cold air at rear discharge

air outlets in the maximum cold position.

 Does the rear air control (rear) operate properly?

YES

>> GO TO 4.

NO

>> Check rear air control (rear). Refer to 

HAC-56, "Rear Air Control (Rear) Diagnosis Procedure #2"

.

4.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (FRONT) MODE OPERATIONAL CHECK 

1. Press the REAR CTRL switch on rear air control (front) (REAR CTRL indicator off).

2. Press each mode switch and check for proper air discharge at the appropriate locations.
 Does the rear air control (front) operate properly?

YES

>> GO TO 5.

NO

>> Check mode door motor (rear). Refer to 

HAC-63, "Mode Door Motor (Rear) Diagnosis Proce-

dure"

.

5.

CONFIRM SYMPTOM BY PERFORMING REAR AIR CONTROL (REAR) MODE OPERATIONAL CHECK

1. Press the REAR CTRL switch on rear air control (front) to send control to the rear air control (rear).

2. Press each mode switch and check for proper air discharge at the appropriate locations.
 Does the rear air control (rear) operate properly?

YES

>> System OK.

NO

>> Replace rear air control (rear). Refer to 

VTL-7, "Removal and Installation"

.

Air Mix Door Motor (Rear) Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

HAC-91, "Wiring Diagram"

.

SYMPTOM: 

• Temperature control (rear) operation is malfunctioning.

DIAGNOSTIC PROCEDURE FOR INOPERATIVE AIR MIX DOOR MOTOR (REAR)

1.

CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY

1. Disconnect rear air control (front) harness connector.

2. Turn ignition switch ON.

3. Check voltage between rear air control (front) harness connec-

tor R108 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

Battery voltage should exist.

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HAC-60

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REAR AIR CONTROL SYSTEM

2.

CHECK REAR AIR CONTROL (FRONT) LIN BUS VOLTAGE

Check voltage between rear air control (front) harness connector

R108 terminal 5 and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK REAR AIR CONTROL (FRONT) GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between rear air control (front) harness con-

nector R108 terminal 6 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

4.

CHECK LIN BUS VOLTAGE CIRCUIT FOR OPEN

1. Turn ignition switch OFF.

2. Disconnect the mode door motor (rear) harness connector.

3. Check continuity between rear air control (front) harness con-

nector R108 (B) terminal 5 and A/C auto amp. harness connec-

tor M50 (A) terminal 48.

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.

5.

CHECK A/C AUTO AMP. FOR POWER AND GROUND FOR AIR MIX DOOR MOTOR (REAR)

1. Reconnect all disconnected parts.

2. Turn ignition switch ON.

3. Rotate temperature control dial (rear) to maximum heat.

4. Check voltage between A/C auto amp. harness connector M50

terminal 49 and terminal 50 while rotating temperature control

dial (front) to maximum cold.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 6.

6.

CHECK AIR MIX DOOR MOTOR (REAR) CIRCUITS FOR OPEN

Battery voltage should exist.

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Continuity should exist.

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: Continuity should exist.

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Connector

Terminals

Condition 

Voltage 

(Approx.)

(+) (-)

A/C auto amp.: 

M50

49 50

Rotate temp 

control dial

Battery 
voltage

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