Infiniti Q45 (FY33). Manual — part 480
TERMINAL
NO.
ITEM
CONDITION
Voltage
V
33
Power source for ACC
—
Approximately 12
34
Blower motor feed back
Fan speed: Low
Approximately 7
35
Fan control AMP. control signal
Fan speed
Low, Middle low or
Middle high
Approximately 2.5 - 3.0
High
Approximately 9.0
36
Power supply for intake door motor
Recirculation switch
ON
,
OFF
*1
*1: When the motor is working, approx. 0V will be indicated. When the motor stops, approx. 12V will exist.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Auto Amp. Terminals and Reference Value
(Cont’d)
HA-85
RHA950F
Main Power Supply and Ground Circuit Check
COMPONENT DESCRIPTION
Automatic amplifier (Auto amp.)
The auto amplifier has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The mode door motor (LCU), air mix door motor (LCU)
and bi-level door motor (LCU), intake door motor, blower motor,
rear vent door motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into auto amplifier.
Self-diagnostic functions are also built into auto amplifier to provide
quick check of malfunctions in the auto air conditioner system.
RHA160H
A/C control unit
By means of multiplex communication, the A/C control unit sends
signals to the auto amp. the switch position and display mode.
RHA154H
Potentio temperature control (PTC)
The PTC is built into the A/C control unit. It can be set at an inter-
val of 0.5°C (1.0°F) in the 18°C (65°F) to 32°C (85°F) temperature
range by rotating the temperature dial. The set temperature is digi-
tally displayed.
RHA161H
DIAGNOSTIC PROCEDURE
TROUBLE DIAGNOSES
HA-86
RHA473FB
Auto amp. check
Check power supply circuit for auto amp. with ignition switch ON.
Measure voltage across terminal Nos.
q
24
,
q
25
,
q
33
and body ground.
Voltmeter terminal
Voltage
!
@
q
24
Body ground
Approx. 12V
q
25
q
33
RHA475FA
Check body ground circuit for auto amp. with ignition switch OFF.
Check for continuity between terminal No.
q
32
and body ground.
Ohmmeter terminal
Continuity
!
@
q
32
Body ground
Yes
RHA162H
A/C control unit check
Check power supply circuit for A/C control unit with ignition switch
ON.
Measure voltage across terminal Nos.
q
3
,
q
9
and body ground.
Voltmeter terminal
Voltage
!
@
q
3
Body ground
Approx. 12V
q
9
RHA498FA
Check body ground circuit for A/C control unit with ignition switch
OFF.
Check for continuity between terminal No.
q
8
and body ground.
Ohmmeter terminal
Continuity
!
@
q
8
Body ground
Yes
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Main Power Supply and Ground Circuit Check
(Cont’d)
HA-87
RHA163H
Self-diagnosis Circuit
DIAGNOSTIC PROCEDURE
For description of self-diagnosis, refer to HA-37.
SYMPTOM:
I
Self-diagnosis cannot be performed.
I
Multiplex communication circuit is open or
shorted. (
or
is indicated on the dis-
play as a result of conducting self-diagnosis
STEP 5.)
RHA981FB
RHA982F
RHA983F
CHECK MAIN POWER SUPPLY AND
GROUND CIRCUIT FOR AUTO AMP.
(Refer to HA-87.)
OK
E
NG
Repair Main Power Supply
and Ground Circuit.
Note
Check circuit continuity between auto amp.
harness terminal No.
q
8
and A/C control
unit harness terminal No.
q
7
.
Continuity should exist.
If OK, check harness for short.
OK
Note
Check circuit continuity between auto amp.
harness terminal No.
q
7
and A/C control
unit harness terminal No.
q
6
.
Continuity should exist.
If OK, check harness for short.
OK
Note
Check circuit continuity between auto amp.
harness terminal No.
q
20
and A/C control
unit harness terminal No.
q
5
.
Continuity should exist.
If OK, check harness for short.
OK
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness
or connector.
TROUBLE DIAGNOSES
H
H
H
H
HA-88
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