Nissan Titan. Instruction — part 403
MODE DOOR MOTOR
HAC-117
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
• Mode door motor does not operate normally.
1.
CHECK MODE DOOR MOTOR POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE
1. Turn ignition switch ON.
2. Using CONSULT, check "MODE FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to
3. Observe "MODE FDBCK" voltage while cycling front air control mode switch through all modes.
Is the inspection result normal?
YES
>> • Mode door motor is OK.
• Inspect mode door for mechanical failure. Refer to
VTL-19, "Removal and Installation"
NO
>> GO TO 2.
2.
CHECK MODE 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 mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M180 (A) terminals 19, 20 and the mode door motor harness
connector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M180 terminals 19, 20 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
3.
CHECK FRONT AIR CONTROL FOR MODE DOOR MOTOR POWER AND GROUND
1. Reconnect front air control harness connector.
2. Turn ignition switch ON.
3. Press the mode switch to the D/F (
) mode.
4. Check voltage between front air control harness connector
M180 terminal 19 and terminal 20 while pressing the mode
switch to the VENT (
), and then the B/L (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
Monitor Item
Condition
Results
MODE FDBCK
Cycle mode switch through all modes, D/F
(
), VENT (
), B/L (
), and FOOT(
)
Voltage varies between D/F (
) and VENT (
), and
between VENT (
) and B/L (
).
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
19
M142
5
Yes
20
6
Connector
Terminal
—
Continuity
M180
19
Ground
No
20
AWIIA0364ZZ
AWIIA0361ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M180
19
20
D/F (
) mode to VENT (
) mode
Battery voltage
20
19
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0360ZZ
HAC-118
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
MODE DOOR MOTOR
NO
>> Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
4.
CHECK MODE 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, and M181 (A) terminal 28 and the mode
door motor harness connector M142 (B) terminals 1, 3.
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
1. Check continuity between front air control harness connector
M180 (A) terminal 7 and mode door motor harness connector
M142 (B) terminal 2.
2. Check continuity between front air control harness connector
M180 terminal 7 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
A and C
B
Continuity
Connector
Terminal
Connector
Terminal
M180 (C)
3
M142
3
Yes
M181 (A)
28
1
Connector
Terminal
—
Continuity
M180 (C)
3
Ground
No
M181 (A)
28
AWIIA0368ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M180
7
M142
2
Yes
AWIIA0371ZZ
Connector
Terminal
—
Continuity
M180
7
Ground
No
AWIIA0370ZZ
MODE DOOR MOTOR
HAC-119
< 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. 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 7 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
1. Reconnect the mode door motor harness connector M142.
2. Check voltage between front air control harness connector
M180 terminal 7 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-8, "Removal and Installation"
NO
>> Replace the mode door motor. Refer to
.
A
B
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M181
28
M180
3
5 Volts
Connector
Terminal
—
Voltage (Approx.)
M180
7
Ground
0 Volts
AWIIA0813ZZ
AWIIA0369ZZ
Connector
Terminal
—
Voltage (Approx.)
M180
7
Ground
0.2 to 4.8 Volts
AWIIA0369ZZ
HAC-120
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 1)]
AIR MIX DOOR MOTOR
AIR MIX DOOR MOTOR
System Description
INFOID:0000000009882519
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
• Position balanced resistor (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 (1) 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:0000000009882520
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
AWIIA1391ZZ
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