Infiniti Q45 (FY33). Manual — part 483
RHA935F
COMPONENT INSPECTION
Intake sensor
After disconnecting intake sensor harness connector, measure
resistance between terminals
q
1
and
q
9
at sensor harness side,
using the table below.
Temperature °C (°F)
Resistance k
Ω
−20 (−4)
16.2
−10 (14)
9.8
0 (32)
6.0
10 (50)
3.94
20 (68)
2.64
25 (77)
2.12
30 (86)
1.82
40 (104)
1.27
RHA969F
Sunload Sensor Circuit
COMPONENT DESCRIPTION
The sunload sensor is located on the right defroster grille. It detects
sunload entering through windshield by means of a photo diode.
The sensor converts the sunload into a current value which is then
input to the auto amplifier.
Measure voltage between auto amp. terminal
q
10
and body ground.
SUNLOAD INPUT PROCESS
The auto amp. also includes a processing circuit which “average”
the variations in detected sunload over a period of time. This pre-
vents drastic swings in the ATC system operation due to small or
quick variations in detected sunload.
For example, consider driving along a road bordered by an occa-
sional group of large trees. The sunload detected by the sunload
sensor will vary whenever the trees obstruct the sunlight. The pro-
cessing circuit averages the detected sunload over a period of
time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC
system operation. On the other hand, shortly after entering a long
tunnel, the system will recognize the change in sunload, and the
system will react accordingly.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Intake Sensor Circuit (Cont’d)
HA-97
RHA958F
DIAGNOSTIC PROCEDURE
SYMPTOM: Sunload sensor circuit is open or shorted. (
or
−
appears on the display as a result of conducting Self-di-
agnosis STEP 2.)
RHA909F
RHA910F
RHA911F
CHECK SUNLOAD SENSOR CIRCUIT
BETWEEN SUNLOAD SENSOR AND
AUTO AMP.
Disconnect sunload sensor harness con-
nector.
Do approx. 5 volts exist between sunload
sensor harness terminal No.
q
10
and body
ground?
Yes
E
No
Disconnect auto amp. har-
ness connector.
Note
Check circuit continuity
between sunload sensor
harness terminal No.
q
10
and auto amp. harness ter-
minal No.
q
10
.
Continuity should exist.
If OK, check harness for
short.
OK
Disconnect auto amp. harness connector.
Replace auto amp.
Note
Check circuit continuity between sunload
sensor harness terminal No.
q
9
and auto
amp. harness terminal No.
q
9
.
Continuity should exist.
If OK, check harness for short.
OK
CHECK SUNLOAD SENSOR.
(Refer to HA-99.)
OK
E
NG
Replace sunload sensor.
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont’d)
H
H
H
H
H
H
HA-98
RHA936F
COMPONENT INSPECTION
Sunload sensor
I
When checking sunload sensor, select a place where sun
shines directly on it.
Sunload sensor characteristic curve
SHA927EA
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Sunload Sensor Circuit (Cont’d)
HA-99
Mode Door Motor Circuit (LAN)
SYSTEM DESCRIPTION
Component parts
Mode door control system components are:
1) Auto amp.
2) Mode door motor (LCU: Local Control Unit)
3) In-vehicle sensor
4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System operation
The auto amplifier receives data from each of the
sensors. The amplifier sends mode door, air mix
door, bi-level door motor LCU opening angle data to
the mode door motor LCU, air mix door motor LCU
and bi-level motor LCU.
The mode door motor, air mix door motor and bi-
level door motor read their respective signals
according to the address signal. Opening angle indi-
cation signals received from the auto amplifier 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 or OPEN/CLOSE operation is
selected. The new selection data is returned to the
auto amplifier.
SHA984E
RHA506FB
FOOT/DEF mode specification
I
When the ambient temperature decreases to −13°C (9°F), air
outlet is changed from FOOT to F/D.
I
When the ambient temperature increases to −8°C (18°F), air
outlet is changed from F/D to FOOT.
TROUBLE DIAGNOSES
HA-100
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