Nissan Titan. Instruction — part 404
AIR MIX DOOR MOTOR
HAC-121
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
>> 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-121, "Air Mix Door Motor Diagnosis Procedure"
Air Mix Door Motor Diagnosis Procedure
INFOID:0000000009882521
Regarding Wiring Diagram information, refer to
HAC-155, "Wiring Diagram - Instruction With 2 Control Dial Sys-
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
1.
CHECK AIR MIX DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
3. Observe "DVR MIX FDBACK" voltage while rotating temperature control dial between 32
°C (90°F) and
18
°C (60°F).
Is the inspection result normal?
YES
>> • Air mix door motor is OK.
• Inspect air mix door for mechanical failure and repair if necessary. If air mix door is OK, refer to
HAC-167, "Component Function Check"
for insufficient cooling or
for insufficient heating.
NO
>> GO TO 2.
2.
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 M180 (A) and
the air mix door motor harness connector M147 (B).
3. Check continuity between front air control harness connector
M180 (A) terminals 17, 18 and the air mix door motor harness
connector M147 (B) terminals 1, 6.
Monitor Item
Condition
Results
DVR MIX FDBCK
Rotate temperature control dial between 32
°C
(90
°F) and 18°C (60°F)
Voltage varies with dial rotation between 0.2 and 4.8
volts.
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
17
M147
1
Yes
18
6
AWIIA0377ZZ
HAC-122
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
AIR MIX DOOR MOTOR
4. Check continuity between front air control harness connector
M180 terminals 17, 18 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
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 temperature control dial to 32
°C (90°F).
4. Check voltage between front air control harness connector
M180 terminal 17 and terminal 18 while rotating temperature
control 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"
.
4.
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.
3. Check continuity between front air control harness connector
M180 (C) terminal 3, connector M181 (A) terminal 28 and air mix
door motor harness connector M147 (B) terminals 3, 2.
4. Check continuity between front air control harness connector
M180 (C) terminal 3, M181 (A) terminal 28 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace harness as necessary.
5.
CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
Connector
Terminal
—
Continuity
M180
17
Ground
No
18
AWIIA0374ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M180
17
18
While rotating temperature control
dial from 32
°C (90°F) to 18°C (60°F)
Battery voltage
18
17
While rotating temperature control
dial from 18
°C (60°F) to 32°C (90°F)
Battery voltage
AWIIA0373ZZ
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M180 (C)
3
M147
2
Yes
M181 (A)
28
3
Connector
Terminal
—
Continuity
M180 (C)
3
Ground
No
M181 (A)
28
AWIIA0393ZZ
AIR MIX DOOR MOTOR
HAC-123
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Check continuity between front air control harness connector
M180 (A) terminal 6 and air mix door motor harness connector
M147 (B) terminal 4.
2. Check continuity between front air control harness connector
M180 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness as necessary.
6.
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
M180 (B) terminal 3, and M181 (A) terminal 28.
4. Check voltage between front air control harness connector
M180 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace front air control. Refer to
7.
CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
6
M147
4
Yes
AWIIA0384ZZ
Connector
Terminal
—
Continuity
M180
6
Ground
No
AWIIA0383ZZ
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M181
28
M180
3
5 Volts
AWIIA0813ZZ
Connector
Terminal
—
Voltage (Approx.)
M180
6
Ground
0 Volts
AWIIA0382ZZ
HAC-124
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
AIR MIX DOOR MOTOR
1. Reconnect the air mix door motor harness connector M147.
2. Check voltage between front air control harness connector
M180 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-8, "Removal and Installation"
.
NO
>> Replace air mix door motor. Refer to
.
Connector
Terminal
—
Voltage (Approx.)
M180
6
Ground
0.2 to 4.8 Volts
AWIIA0382ZZ
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