Nissan Xterra. Instruction — part 456
HAC-22
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
AIR MIX DOOR MOTOR
The air mix door motor is attached to the heater and cooling unit
assembly. This motor rotates so that the air mix door is opened or
closed to a position set by the front air control. Motor rotation is then
conveyed through a shaft and the air mix door position is then fed
back to the front air control by the PBR built into the air mix door
motor.
Air Mix Door Motor Component Function Check
INFOID:0000000009482472
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Blower must be ON.
2. Turn the temperature control dial clockwise to maximum heat.
3. Check for hot air at discharge air outlets.
>> GO TO 2.
2.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE
1. Turn the temperature control dial counterclockwise to maximum cold.
2. Check for cold air at discharge air outlets.
Is the inspection results normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-22, "Air Mix Door Motor Diagnosis Procedure"
.
Air Mix Door Motor Diagnosis Procedure
INFOID:0000000009482473
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR
1.
CHECK AIR MIX DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M50 and the air mix door motor harness connector
M147.
3. Check continuity between front air control harness connector M50 terminals 17, 18 and the air mix door
motor harness connector M147 terminals 5, 6.
WJIA1636E
Connector
Terminal
Connector
Terminal
Continuity
M50
18
M147
6
Yes
17
5
AIR MIX DOOR MOTOR
HAC-23
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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4. Check continuity between front air control harness connector
M50 terminals 17, 18 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Press the mode switch D/F (
) mode.
4. Check voltage between front air control harness connector M50
terminal 17 and terminal 18 while pressing the mode switch to
VENT (
), and then to B/L (
) mode.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace front air control. Refer to
VTL-19, "Removal and Installation"
3.
CHECK AIR MIX DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connectors M50 and M2.
3. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and
the air mix door motor harness connector M147 terminals 1, 3.
4. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness as necessary.
4.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
1. Check continuity between front air control harness connector M50 terminal 6 and air mix door motor har-
ness connector M147 terminal 2.
Connector
Terminal
—
Continuity
M50
17
Ground
No
18
AWIIA0374ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M50
18
17
Pressing the mode switch from D/F
(
) mode to VENT (
) mode
Battery voltage
17
18
Pressing the mode switch from VENT
(
) mode to B/L (
) mode
Battery voltage
AWIIA0373ZZ
Connector
Terminal
Connector
Terminal
Continuity
M50
3
M147
3
Yes
M2
28
1
Connector
Terminal
—
Continuity
M50
3
Ground
No
M2
28
HAC-24
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
AIR MIX DOOR MOTOR
2. Check continuity between front air control harness connector
M50 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK
SIGNAL
1. Reconnect front air control harness connectors.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M50 terminal 3 and M2 terminal 28.
4. Check voltage between front air control harness connector M50
terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace front air control. Refer to
.
6.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
1. Reconnect the air mix door motor harness connector M147.
2. Check voltage between front air control harness connector M50
terminal 6 and ground.
Is the inspection result normal?
YES
>> Inspect air mix door for binding or mechanical failure. If
air mix door moves freely, replace front air control. Refer
to
VTL-19, "Removal and Installation"
NO
>> Replace the air mix door motor. Refer to
.
Connector
Terminal
Connector
Terminal
Continuity
M50
6
M147
2
Yes
Connector
Terminal
—
Continuity
M50
6
Ground
No
AWIIA0383ZZ
Connector
Terminal
Connector
Terminal
Voltage (Approx.)
(+)
(-)
M2
28
M50
3
5V
Connector
Terminal
—
Voltage (Approx.)
M50
6
Ground
0V
AWIIA0382ZZ
Connector
Terminal
—
Voltage (Approx.)
M50
6
Ground
0.2V to 4.8V
AWIIA0382ZZ
INTAKE DOOR MOTOR
HAC-25
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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INTAKE DOOR MOTOR
System Description
INFOID:0000000009482474
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
• Front air control
• Intake door motor
• Intake sensor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotates closing off the fresh air inlet and
recirculating the cabin air. If the recirculation switch is depressed again, the intake door motor rotates in the
opposite direction, again allowing fresh air into the cabin.
COMPONENT DESCRIPTION
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:0000000009482475
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - REC (
)
1. Turn blower control dial to any speed.
WJIA1478E
WJIA1486E
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