Nissan Primera P11. Manual - part 477
Diagnostic Procedure 4: Models with relay
type 1
SYMPTOM: Blower motor fan speed does not change when
fan speed is in AUTO. (Fan speed is fixed in
LOW.)
CHECK THERMAL TRANSMITTER.
Disconnect auto amp. harness connec-
tor.
Is resistance between auto amplifier
terminal No.
p
10
and
p
5
lower than
approx.
940
Ω
?
NG
E
OK
CHECK POWER SUP-
PLY FOR LOW RELAY.
Disconnect low relay.
Do approx.
12 volts
exist
between low relay har-
ness terminal No.
p
1
and body ground?
OK
NG
CHECK THERMAL TRANSMITTER
CIRCUIT.
Go to Diagnostic Procedure 14.
(HA-77)
Reconnect low relay.
Check 10A fuse (No.
26
)
at fuse block.
(Refer to “POWER SUP-
PLY ROUTING” in EL sec-
tion and Wiring Diagram.)
CHECK A/C CONTROL PANEL
Do approx.
0.5V
exist between A/C
control panel terminal
p
35
and body
ground when you select AUTO posi-
tion?
OK
E
NG
Replace A/C control
panel.
Note
Check circuit continuity between A/C
control panel harness terminal
p
35
and
auto amp. harness terminal
p
11
.
OK
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.
0 volts
exist between low
relay harness terminal No.
p
2
and
body ground when you move PTC
from 18°C (64°F) to 32°C (90°F)?
OK
E
NG
Replace low relay.
p
A
(Go to next page)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA254
Auto amp. connector
AUTO amp.
connector
YHA390
NHA450
A/C control panel
connector
YHA259
Auto amp.
connector
A/C control panel
connector
YHA391
H
H
H
H
H
H
H
TROUBLE DIAGNOSES
AUTO
HA-61