Nissan Titan. Instruction — part 423
MODE DOOR MOTOR
HAC-197
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
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F
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HAC
N
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MODE DOOR MOTOR
System Description
INFOID:0000000009882575
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Front air control
• Mode door motor
• PBR (built into mode door motor)
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the front air control by means of the mode
door motor. When a mode door position is selected on the front air control, voltage is applied to one circuit of
the mode door motor while ground is applied to the other circuit, causing the mode 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 mode door position by measuring the voltage signal on the PBR circuit.
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet as indicated by
the front air control. Motor rotation is conveyed to a link which acti-
vates the mode door.
Mode Door Motor Component Function Check
INFOID:0000000009882576
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Rotate the mode control dial and check each position and press the
(DEF) mode.
2. Confirm that discharge air comes out according to the air distribution table. Refer to
.
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (
) or D/F (
) is selected.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-197, "Mode Door Motor Diagnosis Procedure"
Mode Door Motor Diagnosis Procedure
INFOID:0000000009882577
Regarding Wiring Diagram information, refer to
HAC-232, "Wiring Diagram - Instruction With 3 Control Dial Sys-
SYMPTOM:
• Air outlet does not change.
WJIA0587E
HAC-198
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MODE DOOR MOTOR
• Mode door motor does not operate normally.
1.
CHECK MODE 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 mode door motor harness connector M142 (B).
3. Check continuity between front air control harness connector
M176 (A) terminals 5, 6 and the mode door motor harness con-
nector M142 (B) terminals 5, 6.
4. Check continuity between front air control harness connector
M176 terminals 5, 6 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness as necessary.
2.
CHECK FRONT AIR CONTROL FOR MODE 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
M176 terminal 5 and terminal 6 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-8, "Removal and Installation"
.
3.
CHECK MODE DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
5
M142
5
Yes
6
6
Connector
Terminal
—
Continuity
M176
5
Ground
No
6
AWIIA0493ZZ
AWIIA0490ZZ
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M176
5
6
Rotating the mode control dial from
D/F (
) mode to VENT (
) mode
Battery voltage
6
5
Rotating the mode control dial from
VENT (
) mode to B/L (
) mode
Battery voltage
AWIIA0489ZZ
MODE DOOR MOTOR
HAC-199
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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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 the mode door motor harness con-
nector M142 (B) terminals 1, 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 16 and mode door motor harness connector
M142 (B) terminal 2.
2. Check continuity between front air control harness connector
M176 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
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
2
M142
1
Yes
15
3
Connector
Terminal
—
Continuity
M176
2
Ground
No
15
AWIIA0498ZZ
A
B
Continuity
Connector
Terminal
Connector
Terminal
M176
16
M142
2
Yes
AWIIA0503ZZ
Connector
Terminal
—
Continuity
M176
16
Ground
No
AWIIA0499ZZ
HAC-200
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
MODE DOOR MOTOR
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 16 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
M176 terminal 16 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
.
Connector
Terminals
Connector
Terminals
Voltage (Approx.)
(+)
(-)
M176
2
M176
15
5 Volts
AWIIA0495ZZ
Connector
Terminal
—
Voltage (Approx.)
M176
16
Ground
0 Volts
AWIIA0499ZZ
Connector
Terminal
—
Voltage (Approx.)
M176
16
Ground
0.2 to 4.8 Volts
AWIIA0499ZZ
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