Nissan Primera P11. Manual — part 476
p
A
Note
Check circuit continuity between LO relay
harness terminal No.
p
5
and body ground.
OK
CHECK LO RELAY AFTER DISCON-
NECTING IT.
E
NG
Replace LO relay.
Diagnostic Procedure 3: Models with relay
type 1
SYMPTOM: Blower motor fan speed does not change when
fan speed is in AUTO. (Fan speed is fixed in
HIGH or MED.)
C/R
*1
Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18°C (64°F)
to 32°C (90°F)?
OK
E
NG
CHECK PTC CIRCUIT
BETWEEN CONTROL
PANEL AND AUTO
AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p
21
and auto amp. har-
ness terminal No.
p
4
.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p
25
and auto amp. har-
ness terminal No.
p
5
.
OK
Reconnect control panel harness con-
nector.
F
OK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
p
A
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuit
Go to Diagnostic
Procedure 11.
In-vehicle sensor
circuit
Go to Diagnostic
Procedure 12.
YHA384
YHA262
Control panel
connector
Auto amp.
connector
YHA263
Auto amp.
connector
Control panel
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Diagnostic Procedure 2: Models with relay
type 2 (Cont’d)
HA-57
p
A
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.
12 volts
exist between auto
amp. harness terminal No.
p
15
,
p
16
and body ground?
OK
E
NG
Replace auto amp.
CHECK HIGH OR MED-HIGH, MED-
LOW RELAY AFTER DISCONNECT-
ING IT. (Refer to HA-78.)
OK
E
NG
Replace HIGH relay or
MED-HIGH, MED-LOW
relay.
Note
Does continuity exist between blower
motor harness terminal No.
p
2
and
HIGH relay terminal No.
p
3
?
Yes
Note
Does continuity exist between resistor
harness terminal No.
p
6
and MED-
HIGH relay harness terminal No.
p
3
?
Yes
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA301
Auto amp. connector
Checking resistor
Refer to pageHA-30.
NHA449
Blower motor
connector
HIGH relay
connector
YHA253
Fan resistor
connector
MED-HIGH Relay
connector
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Diagnostic Procedure 3: Models with relay
type 1 (Cont’d)
HA-58
Diagnostic Procedure 3: Models with relay
type 2
SYMPTOM: Blower motor fan speed does not change when
fan speed is in AUTO. (Fan speed is fixed in
HIGH or MED.)
C/R
*1
Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18°C (64°F)
to 32°C (90°F)?
OK
E
NG
CHECK PTC CIRCUIT
BETWEEN CONTROL
PANEL AND AUTO
AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p
21
and auto amp. har-
ness terminal No.
p
4
.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p
25
and auto amp. har-
ness terminal No.
p
5
.
OK
Reconnect control panel harness con-
nector.
F
OK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
p
A
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuit
Go to Diagnostic
Procedure 11.
In-vehicle sensor
circuit
Go to Diagnostic
Procedure 12.
YHA262
Control panel
connector
Auto amp.
connector
YHA263
Auto amp.
connector
Control panel
connector
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
HA-59
p
A
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.
12 volts
exist between auto
amp. harness terminal No.
p
15
,
p
16
and body ground?
OK
E
NG
Replace auto amp.
CHECK HIGH OR MED-HIGH, MED-
LOW RELAY AFTER DISCONNECT-
ING IT. (Refer to HA-78.)
OK
E
NG
Replace HIGH relay or
MED-HIGH, MED-LOW
relay.
Note
Does continuity exist between blower
motor harness terminal No.
p
2
and
HIGH relay terminal No.
p
3
?
Yes
Note
Does continuity exist between resistor
harness terminal No.
p
6
and MED-
HIGH relay harness terminal No.
p
3
?
Yes
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA301
Auto amp. connector
Checking resistor
Refer to pageHA-30.
NHA449
Blower motor
connector
HIGH relay
connector
YHA385
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
Diagnostic Procedure 3: Models with relay
type 2 (Cont’d)
HA-60
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