Nissan Frontier. Manual — part 905
HAC-174
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MODE DOOR MOTOR
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
3.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the front air control harness connector M49 (A).
3. Check continuity between front air control harness connector M49 (A) terminals 23, 26 and the mode door
motor harness connector M142 (B) terminals 1, 3.
4. Check continuity between front air control harness connector M49 (A) terminals 23, 26 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
1. Check continuity between front air control harness connector
M49 terminal 21 and mode door motor harness connector M142
terminal 4.
2. Check continuity between front air control harness connector
M49 terminal 16 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
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 M49 terminal 23 and terminal 26.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
1
14
Rotating the mode control dial from
D/F (
) mode to VENT (
) mode
Battery voltage
14
1
Rotating the mode control dial from
VENT (
) mode to B/L (
) mode
Battery voltage
A
B
Continuity
Connector
Terminal
Connector
Terminal
M49
23
M142
3
Yes
26
2
Connector
Terminal
—
Continuity
M49 (A)
23
Ground
No
26
Connector
Terminal
Connector
Terminal
Continuity
M49
21
M142
4
Yes
Connector
Terminal
—
Continuity
M49
21
Ground
No
WJIA1089E
MODE DOOR MOTOR
HAC-175
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
4. Check voltage between front air control harness connector M49
terminal 21 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
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 M49
terminal 21 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If
mode door moves freely, replace front air control. Refer
to
VTL-7, "Removal and Installation"
NO
>> Replace the mode door motor. Refer to
.
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M49
23
M49
26
5 Volts
Connector
Terminal
—
Voltage (Approx.)
M49
21
Ground
0 Volts
WJIA1088E
Connector
Terminal
—
Voltage (Approx.)
M49
21
Ground
0.2 to 4.8 Volts
WJIA1088E
HAC-176
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
System Description
INFOID:0000000009478388
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
AIR MIX DOOR MOTOR
HAC-177
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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:0000000009478389
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Blower must be on (1, 2, 3, 4).
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-177, "Air Mix Door Motor Diagnosis Procedure"
Air Mix Door Motor Diagnosis Procedure
INFOID:0000000009478390
Regarding Wiring Diagram information, refer to
HAC-200, "Wiring Diagram - With Type 2"
.
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 M49 and the air mix door motor harness connector
M147.
3. Check continuity between front air control harness connector M49 terminals 3, 2 and the air mix door
motor harness connector M147 terminals 5, 6.
4. Check continuity between front air control harness connector M49 terminals 3, 2 and ground.
WJIA1636E
Connector
Terminal
Connector
Terminal
Continuity
M49
2
M147
6
Yes
3
5
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