Nissan Frontier. Manual — part 888
HAC-106
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MODE DOOR MOTOR
4. Check voltage between front air control harness connector M50 terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
6.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
1. Reconnect the mode door motor harness connector M142.
2. Check voltage between front air control harness connector M50 terminal 10 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If mode door moves freely, replace front air
VTL-7, "Removal and Installation"
NO
>> Replace the mode door motor. Refer to
VTL-21, "Removal and Installation"
.
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M59
28
M50
3
5 Volts
Connector
Terminal
—
Voltage (Approx.)
M50
10
Ground
0 Volts
Connector
Terminal
—
Voltage (Approx.)
M50
10
Ground
0.2 to 4.8 Volts
AIR MIX DOOR MOTOR
HAC-107
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AIR MIX DOOR MOTOR
System Description
INFOID:0000000009478338
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motor
• Position Balanced Resistor (PBR) (built into air mix door motor)
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to
it, and which one has ground applied to it. The front air control monitors the air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motor
WJIA1316E
WJIA0435E
HAC-108
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
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:0000000009478339
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 result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-108, "Air Mix Door Motor Diagnosis Procedure"
Air Mix Door Motor Diagnosis Procedure
INFOID:0000000009478340
Regarding Wiring Diagram information, refer to
HAC-133, "Wiring Diagram - With Type 1"
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate normally.
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 (A) and
the air mix door motor harness connector M147 (B).
3. Check continuity between front air control harness connector
M50 (A) terminals 17, 18 and the air mix door motor harness
connector M147 (B) terminals 5, 6.
WJIA1636E
A
B
Continuity
Connector
Terminal
Connector
Terminal
M50
18
M147
6
Yes
17
5
AWIIA1206ZZ
AIR MIX DOOR MOTOR
HAC-109
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
4. Check continuity between front air control harness connector
M50 terminals 17, 18 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
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 4.
NO
>> Replace front air control. Refer to
VTL-7, "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 connector M50.
3. Check continuity between front air control harness connector M50 (A) terminal 3 and M59 (A) terminal 28,
and the air mix door motor harness connector M147 (B) terminals 1, 3.
4. Check continuity between front air control harness connector M50 (A) terminal 3 and M59 (A) terminal 28,
and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
4.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
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
A
B
Continuity
Connector
Terminal
Connector
Terminal
M50
3
M147
3
Yes
M59
28
1
Connector
Terminal
—
Continuity
M50 (A)
3
Ground
No
M59 (A)
28
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