Control NISSAN PRIMERA 1999 Electronic Repair Manual

Diagnostic Procedure 2: Models with relay
type 1
SYMPTOM: Blower motor does not rotate at all when the fan
speed is in AUTO. (It operates in 1, 2, 3, or
4-speed only.)
CHECK POWER SUPPLY FOR A/C
(LO) RELAY.
Disconnect LO relay harness connec-
tor.
Do approx.12 voltsexist between
AUTO relay harness terminal No.
p1
and body ground?
OK
ENG
Check 10A fuse (No.26)
at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
Check circuit continuity between LO
relay harness terminal No.
p2and
body ground.
OK
ENG
CHECK FAN SWITCH
(Refer to Electrical Com-
ponents Inspection.)
(HA-78)
OK NG
Replace
A/C con-
trol panel.
Note
Check circuit continuity
between LO relay har-
ness terminal No.
p2
and A/C control panel
harness terminal No.
p33.
Note
CHECK POWER SUPPLY FOR LO
RELAY.
Do approx.12 voltsexist between LO
relay harness terminal No.
p3and
body ground?
OK
ENG
Check circuit continuity
between resistor harness
terminal No.
p8and LO
relay harness terminal
No.
p3.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA245
LO relay
connector
YHA246
LO relay
connector
YHA247
LO relay
connector
YHA248
LO relay
connectorResistor
connector
NHA448
A/C control panel
connectorLO relay
connector
Continuity should exist when test leads
are connected as shown; itshould not
exist when test leads are reversed.
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-54

Diagnostic Procedure 2: Models with relay
type 2
SYMPTOM: Blower motor does not rotate at all when the fan
speed is in AUTO. (It operates in 1, 2, 3, or
4-speed only.)
CHECK POWER SUPPLY FOR A/C
(LO) RELAY.
Disconnect LO relay harness connec-
tor.
Do approx.12 voltsexist between
AUTO relay harness terminal No.
p1
and body ground?
OK
ENG
Check 10A fuse (No.26)
at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
Check circuit continuity between LO
relay harness terminal No.
p2and
body ground.
OK
ENG
CHECK FAN SWITCH
(Refer to Electrical Com-
ponents Inspection.)
(HA-78)
OK NG
Replace
A/C con-
trol panel.
Note
Check circuit continuity
between LO relay har-
ness terminal No.
p2
and A/C control panel
harness terminal No.
p33.
Note
CHECK POWER SUPPLY FOR LO
RELAY.
Do approx.12 voltsexist between LO
relay harness terminal No.
p3and
body ground?
OK
ENG
Check circuit continuity
between resistor harness
terminal No.
p8and LO
relay harness terminal
No.
p3.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA379
YHA380
YHA381
YHA382
YHA389
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-56

pA
Note
Check circuit continuity between LO relay
harness terminal No.
p5and body ground.
OK
CHECK LO RELAY AFTER DISCON-
NECTING IT.
ENG
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*1Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18ÉC (64ÉF)
to 32ÉC (90ÉF)?
OK
ENG
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.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
Reconnect control panel harness con-
nector.
FOK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
pA
(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
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
YHA384
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
H
H
HH
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 2: Models with relay
type 2 (Cont'd)
HA-57

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*1Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to HA-51.)
Does blower motor fan speed change
when you move PTC from 18ÉC (64ÉF)
to 32ÉC (90ÉF)?
OK
ENG
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.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
Reconnect control panel harness con-
nector.
FOK
CHECK A/C CONTROL
PANEL.
(Refer to HA-51.)
NG
Replace A/C Control
panel.
pA
(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
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
HH
H
H
H
TROUBLE DIAGNOSESAUTO
HA-59

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.
p10andp5lower than
approx.940W?
NG
EOK
CHECK POWER SUP-
PLY FOR LOW RELAY.
Disconnect low relay.
Do approx.12 voltsexist
between low relay har-
ness terminal No.
p1
and body ground?
OK
NG
CHECK THERMAL TRANSMITTER
CIRCUIT.
Go toDiagnostic Procedure 14.
(HA-77)
Reconnect low relay.Check 10A fuse (No.26)
at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
CHECK A/C CONTROL PANEL
Do approx.0.5Vexist between A/C
control panel terminal
p35and body
ground when you select AUTO posi-
tion?
OK
ENG
Replace A/C control
panel.
Note
Check circuit continuity between A/C
control panel harness terminal
p35and
auto amp. harness terminal
p11.
OK
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.0 voltsexist between low
relay harness terminal No.
p2and
body ground when you move PTC
from 18ÉC (64ÉF) to 32ÉC (90ÉF)?
OK
ENG
Replace low relay.
pA
(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.
connectorA/C control panel
connector
YHA391
H
HH
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-61

Diagnostic Procedure 4: Models with relay
type 2
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.
p10andp5lower than
approx.940W?
NG
EOK
CHECK POWER SUP-
PLY FOR LOW RELAY.
Disconnect low relay.
Do approx.12 voltsexist
between low relay har-
ness terminal No.
p1
and body ground?
OK
NG
CHECK THERMAL TRANSMITTER
CIRCUIT.
Go toDiagnostic Procedure 14.
(HA-77)
Reconnect low relay.Check 10A fuse (No.26)
at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL sec-
tion and Wiring Diagram.)
CHECK A/C CONTROL PANEL
Do approx.0.5Vexist between A/C
control panel terminal
p35and body
ground when you select AUTO posi-
tion?
OK
ENG
Replace A/C control
panel.
Note
Check circuit continuity between A/C
control panel harness terminal
p35and
auto amp. harness terminal
p11.
OK
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.0 voltsexist between low
relay harness terminal No.
p2and
body ground when you move PTC
from 18ÉC (64ÉF) to 32ÉC (90ÉF)?
OK
ENG
Replace low relay.
pA
(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
YHA386
NHA450
A/C control panel
connector
YHA259
Auto amp.
connectorA/C control panel
connector
YHA387
H
HH
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-63

Diagnostic Procedure 5
SYMPTOM: Starting fan speed control does not operate.
CHECK THERMAL TRANSMITTER
CIRCUIT.
Go toDiagnostic Procedure 14. (HA-
77)
OK
ENG
Replace engine thermal
transmitter.
CHECK A/C CONTROL PANEL
OPERATION
Do approx.12Vexist between A/C
control panel harness terminal
p22and
body ground when water temp. is
below 56ÉC (133ÉF)?
NG
ENG
Replace A/C control
panel
Note
Disconnect auto amp. and A/C control
panel harness connector.
Check circuit continuity between auto
amp. harness terminal No.
p11and
A/C control panel harness terminal No.
p35.
OK
Replace auto amp.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA451
A/C control panel
connector
YHA259
Auto amp.
connectorA/C control panel
connector
H
H
H
TROUBLE DIAGNOSESAUTO
HA-65

Diagnostic Procedure 6
SYMPTOM: There is too much difference between setting
temp. on PTC and in-vehicle temperature.
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
C/R*2
CHECK PBR.
Connect checking resistor.
(Refer to HA-30.)
Do approx.5 voltsexist between air
mix door motor harness terminal No.
p4andp3when PTC is set at
25ÉC (77ÉF)?
OK
ENG
CHECK PTC.
(Refer to HA-84.)
OK NG
Replace
A/C control
panel.
pA
(Go to next page.)CHECK PBR.
Refer to Inspection of Sen-
sor.
OK
NG
Replace auto amp.CHECK AIR MIX DOOR
MECHANISM.
Refer to Control Linkage
Adjustment. (Refer to
HA-83.)
OK NG
Repair or
adjust.
Replace AIR MIX MOTOR.
RHA963G
Air mix door motor con-
nector
Checking resistor
Refer to pageHA-30.
H
HH
HH
H
H
TROUBLE DIAGNOSESAUTO
HA-66

pA
CHECK IN-VEHICLE SENSOR AND
AMBIENT SENSOR.
(Refer to Control System Input Compo-
nents.) (HA-85, 86)
OK
ENG
Replace in-vehicle sen-
sor or ambient sensor.
CHECK SUNLOAD SENSOR.
Go toDiagnostic Procedure 13. (HA-
76)
OK
ENG
Replace sunload sensor
or auto amp.
CHECK AUTO AMP. OPERATION.
Do approx.0.5 voltsexist between
auto amp. harness terminal No.
p9
and body ground when A/C switch
is ON?
Do approx. 0 volts exist between
auto amp. harness terminal No.
p9
and body ground when A/C switch
is OFF?
OK
ENG
CHECK A/C CONTROL
PANEL OPERATION.
Do approx.0.5 volts
exist between A/C con-
trol panel connector ter-
minal No.
p29and body
ground when A/C switch
is ON?
OK NG
Replace
A/C con-
trol panel
Replace auto amp.
Note
Check circuit continuity
between A/C control
panel harness terminal
p29and Auto amp. har-
ness terminal
p9
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
RHA037H
CONNECT
Auto amp.
connectorM421
Auto amp.
connectorM421
H
H
HH
H
HH
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 6 (Cont'd)
HA-67

Diagnostic Procedure 7
SYMPTOM: Air mix door motor does not operate normally.
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
C/R*2Note
CHECK AUTO AMP. AND PTC.
Connect checking resistor.
(Refer to page HA-30.)
Does air outlet temperature change
when you move PTC from 20ÉC (68ÉF)
to 30ÉC (86ÉF)?
OK
ENG
CHECK PTC CIRCUIT
BETWEEN PTC AND
AUTO AMP.
Disconnect control panel
and auto amp. harness
connectors.
Check circuit continuity
between control panel
harness terminal No.
p21and auto amp. har-
ness terminal No.
p4.
OK
CHECK SENSOR CIRCUIT.
Note
Check circuit continuity
between control panel
harness terminal No.
p25and auto amp. har-
ness terminal No.
p5.
OK
CHECK PTC.
(Refer to HA-84.)
OK
ENG
Replace A/C control
panel.
CHECK FOR OUTPUT OF AUTO
AMP.
Connect checking resistor.
Do approx. 10.5 volts exist between air
mix door motor harness terminals No.
p4andp1when you move PTC
from 18ÉC (64ÉF) to 32ÉC (90ÉF) or
when you move PTC from 32ÉC (90ÉF)
to 18ÉC (64ÉF)?
OK
ENG
Disconnect auto amp.
and air mix door motor
harness connectors.
Note
Check circuit continuity
between auto amp. har-
ness terminal No.
p12
(p13) and air mix door
motor harness terminal
No.
p1(p4).
OK
Replace auto amp.
Replace air mix door motor.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
How to repair
Ambient sensor
circuitGo to Diagnostic
Procedure 11.
In-vehicle sensor
circuitGo to Diagnostic
Procedure 12.
Air mix door
operationTerminal No.
Voltage
p1p4
Cold,Hot!@
Approx.
10.5V
Hot,Cold@
!
Stop Ð Ð0V
YHA262
Control panel
connectorAuto amp.
connector
YHA263
Auto amp.
connectorControl panel
connector
NHA303
Air mix door motor
connector
HH
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
HA-68