2006 NISSAN PATROL Service Manual

SYSTEM DESCRIPTION
Component parts
Mode door control system components are:
1) Auto amp.
2) Mode door motor (LCU)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System operation
The auto ampli®er receives data from each of the sensors. The ampli®er sends air mix door and mode door
opening angle data to the air mix door motor LCU and mode door motor LCU.
The air mix door motor and mode door motor read their respective signals according to the address signal.
Opening angle indication signals received from the auto ampli®er and each of the motor position sensors are
compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/
COLD or DEFROST/VENT operation is selected. The new selection data is returned to the auto ampli®er.
SHA006FA
TROUBLE DIAGNOSESAUTO
Mode Door Motor (Cont'd)
HA-76

Mode door control speci®cation
COMPONENT DESCRIPTION
The mode door motor is attached to the heater unit. It rotates so
that air is discharged from the outlet set by the auto ampli®er. Motor
rotation is conveyed to a link which activates the mode door.
CONTROL LINKAGE ADJUSTMENT
Mode door
1. Install mode door motor on heater unit and connect it to main
harness.
2. Set up code No.
in Self-diagnosis STEP 4. Refer to HA-67.
3. Move side link by hand and hold mode door in DEF mode.
4. Make sure mode door operates properly when changing from
code No.
toby pushing DEF switch.
VENT B/L B/L FOOT F/D DEF
RHA730G
RHA631G
TROUBLE DIAGNOSESAUTO
Mode Door Motor (Cont'd)
HA-77

DIAGNOSTIC PROCEDURE
SYMPTOM: Mode door motor and/or air mix door motor do not
operate normally.
CHECK POWER SUPPLY FOR AUTO
AMP. (LCU) SIDE.
Do approx. 12 volts exist between auto
amp. (LCU) terminalj
15and body ground?
Ye s
cNo
Replace auto amp. (LCU).
CHECK SIGNAL AUTO AMP. (LCU) SIDE.
Do approx. 5.5 volts exist between auto
amp. (LCU) terminalj
5and body ground?
Ye s
cNo
Replace auto amp. (LCU).
Note
CHECK POWER SUPPLY FOR MOTOR
SIDE.
Do approx. 12 volts exist between door
motor (LCU) harness terminalj
31and body
ground?
Ye s
Note
CHECK SIGNAL MOTOR SIDE.
Do approx. 5.5 volts exist between door
motor (LCU) terminalj
32and body ground?
Ye s
Note
CHECK MOTOR GROUND CIRCUIT.
Check harness continuity between door
motor (LCU) harness terminalj
3and body
ground.
OK
Disconnect the mode door motor and air
mix door motor connector.
CHECK THE MODE DOOR MOTOR
OPERATION.
Reconnect the mode door motor and con-
®rm the motor operation.
NGMode door motor operates nor-
mally.
cOK
Replace the air mix door
motor.
Disconnect the mode door motor.
CHECK THE AIR MIX DOOR MOTOR
OPERATION.
Reconnect the air mix door motor and con-
®rm the motor operation.
NGAir mix door motor operates nor-
mally.
cOK
Replace the mode door
motor.
Replace the auto amp. (LCU).
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
RHA636G
RHA635G
RHA638G
RHA637G
RHA639G
.
.
.
.
.
.
.
.
.
TROUBLE DIAGNOSESAUTO
Mode Door Motor (Cont'd)
HA-78

Air Mix Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR (LAN)
SYMPTOM:
+Discharge air temperature does not change.
+Air mix door motor does not operate.
Inspection ¯ow
*1: HA-64
*2: HA-65
*3: HA-67
*4: HA-103*5: HA-105
*6: HA-107
*7: HA-110
*8: HA-79*9: HA-69
*10: HA-78
*11: HA-81
*12: HA-70
SHA021F
TROUBLE DIAGNOSESAUTO
HA-79

SYSTEM DESCRIPTION
Component parts
Air mix door control system components are:
1) Auto amp.
2) Air mix door motor (LCU)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System operation
The auto ampli®er receives data from each of the sensors. The ampli®er sends air mix door and mode door
opening angle data to the air mix door motor LCU and mode door motor LCU.
The air mix door motor and mode door motor read their respective signals according to the address signal.
Opening angle indication signals received from the auto ampli®er and each of the motor position sensors are
compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/
COLD or DEFROST/VENT operation is selected. The new selection data is returned to the auto ampli®er.
RHA424GB
TROUBLE DIAGNOSESAUTO
Air Mix Door Motor (Cont'd)
HA-80

Air mix door control speci®cation
COMPONENT DESCRIPTION
The air mix door motor is attached to the heater unit. It rotates so
that the air mix door is opened or closed to a position set by the
auto ampli®er. Motor rotation is then conveyed through a shaft and
the air mix door position is then fed back to the auto ampli®er by
PBR built-in air mix door motor.
CONTROL LINKAGE ADJUSTMENT
Air mix door (Water cock)
1. Install air mix door motor on heater unit and connect it to main
harness.
2. Set up code No.
in Self-diagnosis STEP 4. Refer to HA-67.
3. Move air mix door lever by hand and hold it in full cold position.
4. Attach air mix door lever to rod holder.
5. Make sure air mix door operates properly when changing from
code No.
toby pushing DEF switch.
Full cold Full hot
6. Set up code No.in Self-diagnosis STEP 4.
7. Attach water cock cable to air mix door linkage and secure with
clip.
8. Rotate and hold water cock lever AND plate in the full cold
position (CLOCKWISE completely).
9. Attach water cock cable to plate and secure with clip (white
mark on cable housing should be centered under the retaining
clip).
10. Check that water cock operates properly when changing from
code No.
toby pushing DEF switch. (After several
cycles, water cock lever should be midpoint of plate opening
when code No.
is set.)
RHA690G
RHA696G
SHA522E
TROUBLE DIAGNOSESAUTO
Air Mix Door Motor (Cont'd)
HA-81

Intake Door Motor
TROUBLE DIAGNOSIS PROCEDURE FOR INTAKE DOOR
SYMPTOM:
+Intake door does not change.
+Intake door motor does not operate normally.
Inspection ¯ow
*1: HA-64
*2: HA-65
*3: HA-67
*4: HA-103*5: HA-105
*6: HA-107
*7: HA-110
*8: HA-79*9: HA-85
*10: HA-84
*11: HA-70
*12: HA-69
SHA022F
TROUBLE DIAGNOSESAUTO
HA-82

SYSTEM DESCRIPTION
Component parts
Intake door control system components are:
1) Auto amp.
2) Intake door motor
3) A/C LAN system (PBR built-in mode motor and air mix door motor)
4) In-vehicle sensor
5) Ambient sensor
6) Sunload sensor
7) Intake sensor
System operation
The intake door control determines intake door position based on the ambient temperature, the intake air
temperature and the in-vehicle temperature. When the A/C, DEFROSTER, or OFF switches are pushed, the
auto ampli®er sets the intake door at the ``Fresh'' position.
RHA640G
TROUBLE DIAGNOSESAUTO
Intake Door Motor (Cont'd)
HA-83