Nissan Titan. Instruction — part 424
AIR MIX DOOR MOTOR
HAC-201
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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HAC
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AIR MIX DOOR MOTOR
System Description
INFOID:0000000009882578
SYSTEM DESCRIPTION
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motor
• PBR (built-into air mix door motors)
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver side, passenger side, and rear.
The front air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is
applied to the other circuit, causing the appropriate 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 con-
trol monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
The air mix door motor is attached to the front heater & cooling unit
assembly. The 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:0000000009882579
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial clockwise to maximum hot.
2. Check for hot air at discharge air outlets.
WJIA0435E
WJIA1417E
HAC-202
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
AIR MIX DOOR MOTOR
>> 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-202, "Air Mix Door Motor Diagnosis Procedure"
Air Mix Door Motor Diagnosis Procedure
INFOID:0000000009882580
Regarding Wiring Diagram information, refer to
HAC-232, "Wiring Diagram - Instruction With 3 Control Dial Sys-
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
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 M176 (A) and
the air mix door motor harness connector M147 (B).
3. Check continuity between front air control harness connector
M176 (A) terminals 3, 4 and the air mix door motor harness con-
nector M147 (B) terminals 1, 6.
4. Check continuity between front air control harness connector
M176 terminals 3, 4 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
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
3
M147
1
Yes
4
6
Connector
Terminal
—
Continuity
M176
3
Ground
No
4
AWIIA0508ZZ
AWIIA0505ZZ
AIR MIX DOOR MOTOR
HAC-203
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Rotate temperature control dial to 32
°C (90°F).
4. Check voltage between front air control harness connector
M176 terminal 3 and terminal 4 while rotating temperature con-
trol dial to 18
°C (60°F) and back to 32°C (90°F).
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace front air control. Refer to
VTL-8, "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 M176 (A).
3. Check continuity between front air control harness connector
M176 (A) terminals 2, 15 and air mix door motor harness con-
nector M147 (B) terminals 2, 3.
4. Check continuity between front air control harness connector
M176 terminals 2, 15 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
M176 (A) terminal 18 and air mix door motor harness connector
M147 (B) terminal 4.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M176
3
4
While rotating temperature control
dial from 32
°C (90°F) to 18°C (60°F)
Battery voltage
4
3
While rotating temperature control
dial from 18
°C (60°F) to 32°C (90°F)
Battery voltage
AWIIA0504ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
15
M147
2
Yes
2
3
Connector
Terminal
—
Continuity
M176
15
Ground
No
2
AWIIA0955ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
18
M147
4
Yes
AWIIA0515ZZ
HAC-204
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
AIR MIX DOOR MOTOR
2. Check continuity between front air control harness connector
M176 terminal 18 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
M176 terminal 2 and terminal 15.
4. Check voltage between front air control harness connector
M176 terminal 18 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 air mix door motor harness connector M147.
2. Check voltage between front air control harness connector
M176 terminal 18 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-8, "Removal and Installation"
.
NO
>> Replace air mix door motor. Refer to
.
Connector
Terminal
—
Continuity
M176
18
Ground
No
AWIIA0514ZZ
Connector
Terminal
Connector
Terminal
Voltage (Approx.)
(+)
(-)
M176
2
M176
15
5 Volts
AWIIA0511ZZ
Connector
Terminal
—
Voltage (Approx.)
M176
18
Ground
0 Volts
AWIIA0513ZZ
Connector
Terminal
—
Voltage (Approx.)
M176
18
Ground
0.2 to 4.8 Volts
AWIIA0513ZZ
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