Infiniti I35 (A33). Manual — part 546
Temperature °C (°F)
Resistance k
Ω
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
If NG, replace ambient sensor.
RHA412H
In-vehicle Sensor Circuit
COMPONENT DESCRIPTION
NHHA0218
In-vehicle sensor
NHHA0218S01
The in-vehicle sensor is located on instrument lower panel. It con-
verts variations in temperature of compartment air drawn from the
aspirator into a resistance value. It is then input into the auto
amplifier.
RHA413H
RHA482A
Aspirator
NHHA0218S02
The aspirator is located in front of heater unit. It produces vacuum
pressure due to air discharged from the heater unit, continuously
taking compartment air in the aspirator.
RHA056GB
DIAGNOSTIC PROCEDURE
NHHA0219
SYMPTOM: In-vehicle sensor circuit is open or shorted. (
or
−
is indicated on the display as a result of conducting Self-
diagnosis STEP-2.)
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont’d)
HA-97
1
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND GROUND
Disconnect in-vehicle sensor harness connector.
Do approx. 5 volts exist between in-vehicle sensor harness connector M44 terminal No. 1 and ground?
SHA318F
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 4.
2
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between in-vehicle sensor harness connector M44 terminal No. 2 and auto amp. harness con-
nector M59 terminal No. 11.
RHA478GH
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
GO TO 3.
NG
©
Repair harness or connector.
TROUBLE DIAGNOSES
In-vehicle Sensor Circuit (Cont’d)
HA-98
3
CHECK IN-VEHICLE SENSOR
Refer to HA-100.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
1. Replace in-vehicle sensor.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
4
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN IN-VEHICLE SENSOR AND AUTO AMP.
1. Disconnect auto amp. harness connector.
2. Check circuit continuity between in-vehicle sensor harness connector M44 terminal No. 1 and auto amp. harness con-
nector M59 terminal No. 3.
RHA479GF
Continuity should exist.
If OK, check harness for short.
OK or NG
OK
©
1. Replace auto amp.
2. Go to “FUNCTION CONFIRMATION PROCEDURE”, “Self-diagnosis”, HA-37 and per-
form self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.
NG
©
Repair harness or connector.
GI
MA
EM
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
In-vehicle Sensor Circuit (Cont’d)
HA-99
RHA414H
COMPONENT INSPECTION
NHHA0220
In-vehicle Sensor
NHHA0220S01
After disconnecting in-vehicle sensor harness connector, measure
resistance between terminals 1 and 2 at sensor harness side, using
the table below.
Temperature °C (°F)
Resistance k
Ω
−15 (5)
12.73
−10 (14)
9.92
−5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
If NG, replace in-vehicle sensor.
RHA415H
Sunload Sensor Circuit
COMPONENT DESCRIPTION
NHHA0221
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 into the auto amplifier.
SUNLOAD INPUT PROCESS
NHHA0222
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 A/C 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
TROUBLE DIAGNOSES
In-vehicle Sensor Circuit (Cont’d)
HA-100
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