NISSAN PRIMERA 1999 Electronic Repair Manual

Check body ground circuit for auto amp. with ignition switch OFF.
1. Disconnect auto amp. harness connector.
2. Connect ohmmeter from harness side.
3. Check for continuity between terminal No.
p17and body
ground.
Ohmmeter terminal
Continuity
!@
p17Body groundYe s
Diagnostic Procedure 1
SYMPTOM: Blower motor does not rotate at all. (Fan switch
ªAUTOº, ª1º, ª2º, ª3º, ª4º)
lPerform PRELIMINARY CHECK 2 before referring to the
following flow chart.
CHECK POWER SUPPLY FOR
BLOWER MOTOR.
Disconnect blower motor harness con-
nector.
Do approx.12 voltsexist between
blower motor harness terminal No.
p1
and body ground?
OK
ENG
Check 15A fuses (No.
,at fuse block.
(Refer to ªPOWER SUP-
PLY ROUTINGº in EL
section and Wiring Dia-
gram.)
Check circuit continuity between
blower motor harness terminal No.
p2
and body ground.
OK
ENG
Reconnect blower motor
harness connector.
CHECK BLOWER MOTOR.
NG
Replace blower motor.
CHECK BLOWER MOTOR CIRCUIT
BETWEEN BLOWER MOTOR AND
RESISTOR.
Do approx.12 voltsexist between
resistor harness terminal No.
p5and
body ground?
OK
ENG
Disconnect blower motor
and resistor harness
connectors.
Note
Check circuit continuity
between blower motor
harness terminal No.
p2and resistor harness
terminal No.
p5.
pA
(Go to next page.)
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
YHA240 Auto amp. connector
KHA118
Blower motor
connector
KHA119
Blower motor
connector
Continuity should exist.
KHA120
Resistor connec-
tor
YHA244
Blower motor
connectorResistor
connector
H
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
Main Power Supply and Ground Circuit
Check (Cont'd)
HA-52

pA
CHECK RESISTOR AFTER DISCON-
NECTING IT.
OK
ENG
Replace resistor.
CHECK FAN SWITCH. (Refer to Elec-
trical Components Inspection.) (HA-78)
OK
ENG
Replace A/C control
panel.
Note
Check circuit continuity between fan
switch harness terminal No.
p2,
p8,p14,p20and body ground.
Check body ground circuit for A/C
control panel. (Refer to Main Power
Supply and Ground Circuit Check,
HA-51).
OK
Replace blower motor.
Note:
If the result is NG or No after checking circuit continuity, repair harness or
connector.
NHA447
A/C Control
panel connectorH
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 1 (Cont'd)
HA-53

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

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.YHA250
LO relay
connector
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 2: Models with relay
type 1 (Cont'd)
HA-55

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

pA
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.12 voltsexist between auto
amp. harness terminal No.
p15,p16
and body ground?
OK
ENG
Replace auto amp.
CHECK HIGH OR MED-HIGH, MED-
LOW RELAY AFTER DISCONNECT-
ING IT. (Refer to HA-78.)
OK
ENG
Replace HIGH relay or
MED-HIGH, MED-LOW
relay.
Note
Does continuity exist between blower
motor harness terminal No.
p2and
HIGH relay terminal No.
p3?
Ye s
Note
Does continuity exist between resistor
harness terminal No.
p6and MED-
HIGH relay harness terminal No.
p3?
Ye s
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
connectorHIGH relay
connector
YHA253
Fan resistor
connectorMED-HIGH Relay
connector
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
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*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

pA
CHECK AUTO AMP.
Connect checking resistor.
(Refer to HA-30.)
Do approx.12 voltsexist between auto
amp. harness terminal No.
p15,p16
and body ground?
OK
ENG
Replace auto amp.
CHECK HIGH OR MED-HIGH, MED-
LOW RELAY AFTER DISCONNECT-
ING IT. (Refer to HA-78.)
OK
ENG
Replace HIGH relay or
MED-HIGH, MED-LOW
relay.
Note
Does continuity exist between blower
motor harness terminal No.
p2and
HIGH relay terminal No.
p3?
Ye s
Note
Does continuity exist between resistor
harness terminal No.
p6and MED-
HIGH relay harness terminal No.
p3?
Ye s
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
connectorHIGH relay
connector
YHA385
H
H
H
H
H
TROUBLE DIAGNOSESAUTO
Diagnostic Procedure 3: Models with relay
type 2 (Cont'd)
HA-60

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