Nissan Frontier. Instruction — part 870
HAC-34
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR MOTOR
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
Intake Door Motor Component Function Check
INFOID:0000000009478283
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1. Press the mode switch to vent mode(
).
2. Press REC (
) switch. The REC (
)indicator should illuminate.
3. Press REC (
) switch again. The REC (
) indicator should go out.
4. Listen for intake door position change (you should hear blower sound change slightly).
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-34, "Intake Door Motor Diagnosis Procedure"
Intake Door Motor Diagnosis Procedure
INFOID:0000000009478284
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.
CHECK INTAKE DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M52 (A) and
the intake door motor harness connector M58 (B).
3. Check continuity between front air control harness connector
M52 (A) terminals 21, 22 and the intake door motor harness
connector M58 (B) terminals 1, 6.
WJIA1486E
A
B
Continuity
Connector
Terminal
Connector
Terminal
M52
21
M58
6
Yes
22
1
AWIIA0401ZZ
INTAKE DOOR MOTOR
HAC-35
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
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A
B
HAC
N
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4. Check continuity between front air control harness connector
M52 terminals 21, 22 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR INTAKE AIR DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M52
terminal 21 and terminal 22 while placing the HVAC system into
self-diagnostic mode.
Is the inspection result normal?
YES
>> Inspect intake air door for binding or mechanical failure. If intake air door moves freely, replace the
intake air door motor. Refer to
VTL-20, "Removal and Installation"
.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
Connector
Terminal
—
Continuity
M52
21
Ground
No
22
AWIIA0398ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M52
21
22
Self-diagnostic mode (opening)
Battery voltage
22
21
Self-diagnostic mode (closing)
Battery voltage
AWIIA0397ZZ
HAC-36
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System Description
INFOID:0000000009478285
SYSTEM DESCRIPTION
Component Parts
Blower speed control system components are:
• Front air control
• 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 front air control 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 instruction 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).
Blower Speed Compensation - Sunload
AWIIA0411GB
BLOWER MOTOR CONTROL SYSTEM
HAC-37
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
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F
G
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B
HAC
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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 front air control causes the blower speed to
increase.
Blower Speed Control Specification
COMPONENT DESCRIPTION
Variable Blower Control
The variable blower control (1) is located on the cooling unit. The
variable blower control receives a gate voltage from the front air con-
trol to steplessly maintain the blower motor voltage in the 0 to 5 volt
range (approx.).
Front Blower Motor Component Function Check
INFOID:0000000009478286
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - FRONT BLOWER
1. Rotate the blower control dial clockwise once. Blower motor should operate in low speed.
2. Rotate the blower control dial clockwise, and continue checking blower speed until all speeds are
checked.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-37, "Front Blower Motor Diagnosis Procedure"
Front Blower Motor Diagnosis Procedure
INFOID:0000000009478287
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
SYMPTOM: Blower motor operation is malfunctioning.
DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR
WJIA0441E
AWIIA1225ZZ
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