Nissan Frontier. Instruction — part 906
HAC-178
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
AIR MIX DOOR MOTOR
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. Rotate the mode switch to the D/F (
) mode.
4. Check voltage between front air control harness connector M49 terminal 3 and terminal 2 while rotating
the mode control dial to the VENT (
), and then the 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 M49.
3. Check continuity between front air control harness connector M49 terminals 23, 26 and the air mix door
motor harness connector M147 terminals 1, 3.
4. Check continuity between front air control harness connector M49 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 22 and air mix door motor har-
ness connector M147 terminal 2.
2. Check continuity between front air control harness connector M49 terminal 22 and ground.
Connector
Terminal
—
Continuity
M49
3
Ground
No
2
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
2
3
Rotating the mode control dial from
D/F (
) mode to VENT (
) mode
Battery voltage
3
2
Rotating the mode control dial from
VENT (
) mode to B/L (
) mode
Battery voltage
Connector
Terminal
Connector
Terminal
Continuity
M49
26
M147
3
Yes
23
1
Connector
Terminal
—
Continuity
M49
23
Ground
No
26
Connector
Terminal
Connector
Terminal
Continuity
M49
22
M147
2
Yes
AIR MIX DOOR MOTOR
HAC-179
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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.
4. Check voltage between front air control harness connector M49 terminal 22 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 air mix door motor harness connector M147.
2. Check voltage between front air control harness connector M49 terminal 22 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-7, "Removal and Installation"
NO
>> Replace the air mix door motor. Refer to
VTL-23, "Removal and Installation"
.
Connector
Terminal
—
Continuity
M49
22
Ground
No
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M49
23
M49
26
5 Volts
Connector
Terminal
—
Voltage (Approx.)
M49
22
Ground
0 Volts
Connector
Terminal
—
Voltage (Approx.)
M49
22
Ground
0.2 to 4.8 Volts
HAC-180
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
INTAKE DOOR MOTOR
INTAKE DOOR MOTOR
System Description
INFOID:0000000009478391
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:0000000009478392
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 4.
WJIA1478E
WJIA1486E
INTAKE DOOR MOTOR
HAC-181
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
2. Turn mode dial to vent mode (
).
3. Press REC (
) switch.
4. Press REC (
) switch again.
5. 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-181, "Intake Door Motor Diagnosis Procedure"
.
Intake Door Motor Diagnosis Procedure
INFOID:0000000009478393
Regarding Wiring Diagram information, refer to
HAC-200, "Wiring Diagram - With Type 2"
.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM:
• Intake door does not change.
• Intake door motor does not operate normally.
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 M49 and the intake door motor harness connector
M58.
3. Check continuity between front air control harness connector M49 terminals 4, 5 and the intake door
motor harness connector M58 terminals 1, 6.
4. Check continuity between front air control harness connector M49 terminals 4, 5 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 M49 terminal 4 and terminal 5 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
Connector
Terminal
Continuity
M49
4
M58
1
Yes
5
6
Connector
Terminal
—
Continuity
M49
4
Ground
No
5
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M49
5
4
Self-diagnostic mode (opening)
Battery voltage
4
5
Self-diagnostic mode (closing)
Battery voltage
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