INFINITI QX4 2001 Factory Service Manual

With Navigation SystemNBHA0097S0102
RHA882H
*1: HA-66
*2: HA-44
*3: HA-45
*4: HA-45
*5: HA-85*6: STEP-BY-STEP PROCEDURE
(HA-45), see No. 13.
*7: HA-78
*8: HA-90
*9: HA-98*10: HA-82
*11: MA-14
*12: LC-11
*13: LC-16
TROUBLE DIAGNOSES
Insufficient Heating (Cont'd)
HA-122

Noise
TROUBLE DIAGNOSIS PROCEDURE FOR NOISE=NBHA0100SYMPTOM:
INoise
RHA883H
*1: HA-150
*2: HA-152*3: HA-146
*4: HA-66*5: MA-13
*6: MA-14
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Noise
HA-123

Self-diagnosis
TROUBLE DIAGNOSIS PROCEDURE FOR SELF-DIAGNOSIS=NBHA0101SYMPTOM:
ISelf-diagnosis cannot be performed.
Inspection FlowNBHA0101S01Without Navigation SystemNBHA0101S0101
SHA250F
*1: HA-72
*2: HA-129
*3: HA-132*4: HA-135
*5: HA-139
*6: HA-141*7: HA-66
*8: HA-65
*9: HA-66
TROUBLE DIAGNOSES
Self-diagnosis
HA-124

With Navigation SystemNBHA0101S0102
RHA884H
*1: HA-72
*2: HA-129
*3: HA-132
*4: HA-135*5: HA-139
*6: HA-141
*7: HA-66*8: HA-65
*9: HA-66
*10: HA-142
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Self-diagnosis (Cont'd)
HA-125

Memory Function
TROUBLE DIAGNOSIS PROCEDURE FOR MEMORY FUNCTION=NBHA0102SYMPTOM:
IMemory function does not operate.
Inspection FlowNBHA0102S01Without Navigation SystemNBHA0102S0101
RHA885H
*1: HA-72 *2: HA-66 *3: HA-45
TROUBLE DIAGNOSES
Memory Function
HA-126

With Navigation SystemNBHA0102S0102
RHA886H
*1: HA-72 *2: HA-66 *3: HA-45
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Memory Function (Cont'd)
HA-127

ECON (ECONOMY) Mode
TROUBLE DIAGNOSIS PROCEDURE FOR ECON (ECONOMY) MODE=NBHA0103SYMPTOM:
IECON mode does not operate.
Inspection FlowNBHA0103S01Without Navigation SystemNBHA0103S0101
SHA920EA
*1: HA-72 *2: HA-66 *3: HA-45
TROUBLE DIAGNOSES
ECON (ECONOMY) Mode
HA-128

With Navigation SystemNBHA0103S0102
RHA887H
*1: HA-72 *2: HA-66 *3: HA-45
RHA050G
Ambient Sensor Circuit
COMPONENT DESCRIPTIONNBHA0039The ambient sensor is attached in front of the driver's side con-
denser. It detects ambient temperature and converts it into a resis-
tance value which is then input into the auto amplifier.
AMBIENT TEMPERATURE INPUT PROCESSNBHA0040The automatic amplifier includes a ªprocessing circuitº for the ambi-
ent sensor input. However, when the temperature detected by the
ambient sensor increases quickly, the processing circuit retards the
auto amp. function. It only allows the auto amp. to recognize an
ambient temperature increase of 0.33ÉC (0.6ÉF) per 100 seconds.
As an example, consider stopping for a cup of coffee after high
speed driving. Although the actual ambient temperature has not
changed, the temperature detected by the ambient sensor will
increase. This is because the heat from the engine compartment
can radiate to the front grille area, location of the ambient sensor.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
ECON (ECONOMY) Mode (Cont'd)
HA-129

RHA051GE
DIAGNOSTIC PROCEDURENBHA0041SYMPTOM: Ambient sensor circuit is open or shorted. (or
þ
is indicated on the display as a result of conducting Self-
diagnosis STEP 2.)
1 CHECK VOLTAGE BETWEEN AMBIENT SENSOR HARNESS CONNECTOR AND BODY GROUND
Disconnect ambient sensor harness connector.
Do approx. 5 volts exist between ambient sensor harness terminal No. 1 and body ground?
RHA052G
YesorNo
Ye s©GO TO 2.
No©GO TO 4.
2 CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between ambient sensor harness terminal No. 2 and auto amp. (LCU) harness terminal No. 11
or 9.
RHA829H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©GO TO 3.
NG©Repair harness or connector.
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont'd)
HA-130

3 CHECK AMBIENT SENSOR
Refer to HA-131.
OK or NG
OK©1. Replace auto amp. (LCU).
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
NG©Replace ambient sensor.
4 CHECK AMBIENT SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND AUTO AMP. (LCU)
1. Disconnect auto amp. (LCU) harness connector.
2. Check circuit continuity between ambient sensor harness terminal No. 1 and auto amp. (LCU) harness terminal No. 2.
RHA830H
Continuity should exist.
If OK, check harness for short.
OK or NG
OK©1. Replace auto amp. (LCU).
2. Go to self-diagnosis step-by-step procedure (HA-45) and perform self-diagnosis STEP
2.
Confirm that code No. 20 is displayed.
NG©Repair harness or connector.
SHA304F
COMPONENT INSPECTIONNBHA0042Ambient SensorNBHA0042S01After disconnecting ambient sensor harness connector, measure
resistance between terminals 2 and 1 at sensor harness side, using
the table below.
Temperature ÉC (ÉF) Resistance kW
þ15 (5) 12.73
þ10 (14) 9.92
þ5 (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
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
TROUBLE DIAGNOSES
Ambient Sensor Circuit (Cont'd)
HA-131