Nissan Xterra. Instruction — part 455
HAC-18
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MODE DOOR MOTOR
• Mode door motor does not operate normally.
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Turn blower control dial to HI speed.
2. Press each mode switch and check all positions.
3. 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-18, "Mode Door Motor Diagnosis Procedure"
.
Mode Door Motor Diagnosis Procedure
INFOID:0000000009482470
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Air outlet does not change.
• 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 M50 and the mode door motor harness connector
M142.
3. Check continuity between front air control harness connector M50 terminals 23, 24 and the mode door
motor harness connector M142 terminals 1, 6.
4. Check continuity between front air control harness connector M50 terminals 23, 24 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
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. Press the mode switch D/F (
) mode.
4. Check voltage between front air control harness connector M50 terminal 23 and terminal 24 while press-
ing the VENT (
) mode, and then the B/L (
) mode.
Connector
Terminal
Connector
Terminal
Continuity
M50
24
M142
1
Yes
23
6
Connector
Terminal
—
Continuity
M50
23
Ground
No
24
MODE DOOR MOTOR
HAC-19
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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HAC
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Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
3.
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 M50 and M2.
3. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and
the mode door motor harness connector M142 terminals 2, 3.
4. Check continuity between front air control harness connectors M50 terminal 3 and M2 terminal 28, and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
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 M50 terminal 10 and mode door motor har-
ness connector M142 terminal 4.
2. Check continuity between front air control harness connector M50 terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 5.
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 M50 terminal 3 and M2 terminal 28.
Connector
Terminals
Condition Voltage
(Approx.)
(+) (-)
M50
24
23
While pressing the mode control from
D/F (
) mode to VENT (
) mode
Battery voltage
23
24
While pressing the mode control from
VENT (
) mode to B/L (
) mode
Battery voltage
Connector
Terminal
Connector
Terminal
Continuity
M50
3
M142
2
Yes
M2
28
3
Connector
Terminal
—
Continuity
M50
3
Ground
No
M2
28
Connector
Terminal
Connector
Terminal
Continuity
M50
10
M142
4
Yes
Connector
Terminal
—
Continuity
M50
10
Ground
No
HAC-20
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
MODE DOOR MOTOR
4. Check voltage between front air control harness connector M50 terminal 10 and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace front air control. Refer to
VTL-7, "Removal and Installation"
.
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 M50 terminal 10 and ground.
Is the inspection result normal?
YES
>> Inspect mode door for binding or mechanical failure. If mode door moves freely, replace front air
VTL-7, "Removal and Installation"
NO
>> Replace the mode door motor. Refer to
VTL-19, "Removal and Installation"
.
Connector
Terminal
Connector
Terminal
Voltage (Approx.)
(+)
(-)
M2
28
M50
3
5V
Connector
Terminal
—
Voltage (Approx.)
M50
10
Ground
0V
Connector
Terminal
—
Voltage (Approx.)
M50
10
Ground
0.2V to 4.8V
AIR MIX DOOR MOTOR
HAC-21
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL AIR CONDITIONER]
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HAC
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AIR MIX DOOR MOTOR
System Description
INFOID:0000000009482471
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 motor)
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver. The front air control then
applies a voltage to one circuit of the air mix door motor, while ground is applied to the other circuit, causing
the 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 control monitors the air mix door positions by measur-
ing the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motor
WJIA1316E
WJIA0435E
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