1999 NISSAN PICK-UP Repair Manual

VB
STEP 3 - MODE DOOR POSITIONS
ARE CHECKED.
Does code No.
appear on the dis-
play?
YesNo
.
Turn temperature
dial clockwise.Mode door motor position switch is malfunctioning.
(If two or more mode doors are out of order, corre-
sponding code numbers blink respectively two
times.)
*1: If mode door motor harness connector is
disconnected, the following display pattern will
appear.
®
®®®®þ
VC
(Go to next page.)
Code
No.*1Mode door positionReference
page
VENT
HA-2049
B/L
FOOT
D/F
DEF
RHA869DC
RHA168DA
RHA498A
.
.
.
TROUBLE DIAGNOSESAUTO
Self-diagnosis (Cont'd)
HA-2037

VC
STEP 4 - OPERATION OF EACH ACTUA-
TOR IS CHECKED.
Engine running.
Press DEF switch, code No. of each
actuator test is indicated on the display.
Refer to the following chart and confirm
discharge air flow, air temperature, blower
motor voltage and compressor operation.
Checks must be made visually, by lis-
tening to any noise, or by touching air
outlets with your hand, etc. for
improper operation.
OK
cNGlAir outlet does not
change.
Go to HA-2047.
lIntake door does not
change.
Go to HA-2058.
lDischarge air temperature
does not change.
Go to HA-2052.
lMagnet clutch does not
engage.
Go to HA-2068.
lBlower motor operation is
malfunctioning.
Go to HA-2062.
Turn ignition switch OFF or AUTO switch
ON.
END
Code
No.Actuator test pattern
Mode doorIntake
doorAir
mix
doorBlower
motorCom-
pres-
sorFICD
VENTRECFull
Cold4-5V ON ON
B/LRECFull
Cold9-
11VON ON
B/L20%
FREFull
Hot7-9V ON OFF
FOOTFREFull
Hot7 - 9V OFF OFF
D/F
FREFull
Hot7 - 9V OFF OFF
DEFFREFull
Hot10 -
12VON OFF
RHA495A
RHA654FG
.
.
.
.
TROUBLE DIAGNOSESAUTO
Self-diagnosis (Cont'd)
HA-2038

AUXILIARY MECHANISM: Temperature setting
trimmer
The trimmer compensates for differences in range of  3ÉC
between temperature setting (displayed digitally) and tempera-
ture felt by driver.
Operating procedures for this trimmer are as follows:
lBegin Self-diagnosis STEP 4 mode.
lPress(fan) switch to set system in auxiliary mode.
lTurn temperature dial clockwise or counterclockwise as
desired. Temperature will change at a rate of 1ÉC each time
a switch is pressed.
When battery cable is disconnected, trimmer operation is
canceled. Temperature set becomes that of initial condition,
i.e. 0ÉC.
RHA581G
TROUBLE DIAGNOSESAUTO
Self-diagnosis (Cont'd)
HA-2039

How to Perform Trouble Diagnoses for Quick
and Accurate Repair
WORK FLOW
*1: Operational Check (HA-2041)
SYMPTOM TABLE
Symptom Reference page
lA/C system does not come on.lGo to Trouble Diagnosis Procedure for A/C system. HA-2045
lAir outlet does not change.
lGo to Trouble Diagnosis Procedure for Mode Door Motor. HA-2049lMode door motor does not operate nor-
mally.
Discharge air temperature does not change.
lGo to Trouble Diagnosis Procedure for Air Mix Door Motor. HA-2055lAir mix door motor does not operate nor-
mally.
lIntake door does not change.
lGo to Trouble Diagnosis Procedure for Intake Door Motor. HA-2060lIntake door motor does not operate nor-
mally.
lBlower motor operation is malfunctioning.
lGo to Trouble Diagnosis Procedure for Blower Motor. HA-2065lBlower motor operation is malfunctioning
under out of starting fan speed control.
lMagnet clutch does not engage.lGo to Trouble Diagnosis Procedure for Magnet Clutch. HA-2070
lInsufficient cooling.lGo to Trouble Diagnosis Procedure for Insufficient Cooling. HA-2075
lInsufficient heating.lGo to Trouble Diagnosis Procedure for Insufficient Heating. HA-2076
lNoise.lGo to Trouble Diagnosis Procedure for Noise. HA-2077
lSelf-diagnosis cannot be performed.lGo to Trouble Diagnosis Procedure for Self-diagnosis. HA-2078
lMemory function does not operate.lGo to Trouble Diagnosis Procedure for Memory Function. HA-2079
SHA900E
TROUBLE DIAGNOSESAUTO
HA-2040

Operational Check
The purpose of the operational check is to confirm that the sys-
tem operates properly.
CONDITIONS
lEngine running and at normal operating temperature.
PROCEDURE
1. Check memory function
a. Set the temperature 25ÉC.
b. Press OFF switch.
c. Turn the ignition OFF.
d. Turn the ignition ON.
e. Press the AUTO switch.
f. Confirm that the set temperature remains at previous tem-
perature.
g. Press OFF switch.
If NG, go to trouble diagnosis procedure for memory function
(HA-2079).
If OK, continue with next check.
2. Check blower
a. Press fan switch one time.
Blower should operate on low speed.
The fan symbol should have one blade lit
.
b. Press fan switch one more time, and continue checking
blower speed and fan symbol until all speeds are checked.
c. Leave blower on MAX speed
.
If NG, go to trouble diagnosis procedure for blower motor (HA-
2065).
If OK, continue with next check.
3. Check discharge air
a. Press mode switch four times and DEF button.
RHA517G
RHA518G
RHA519G
TROUBLE DIAGNOSESAUTO
HA-2041

b. Confirm that discharge air comes out according to the air
distribution table at left.
Refer to ªDischarge Air Flowº (HA-15 in D22 Service Manual,
Publication No. SM8E-0D22E0E).
NOTE:
Confirm that the compressor clutch is engaged (visual
inspection) and intake door position is at FRESH when the
DEF
is selected.
Intake door position is checked in the next step.
If NG, go to trouble diagnosis procedure for mode door motor
(HA-2049).
If OK, continue with next check.
4. Check recirculation
a. Press RECswitch.
Recirculation indicator should illuminate.
b. Listen for intake door position change (you should hear
blower sound change slightly).
If NG, go to trouble diagnosis procedure for intake door motor
(HA-2060).
If OK, continue with next check.
RHA520G
RHA654FH
RHA521G
TROUBLE DIAGNOSESAUTO
Operational Check (Cont'd)
HA-2042

5. Check temperature dial
a. Turn temperature dial counterclockwise until 18ÉC is dis-
played.
b. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient cooling
(HA-2075).
If OK, continue with next check.
c. Turn temperature dial clockwise until 32ÉC is displayed.
d. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for insufficient heating
(HA-2076).
If OK, continue with next check.
RHA522G
TROUBLE DIAGNOSESAUTO
Operational Check (Cont'd)
HA-2043

6. Check AUTO mode
a. Press AUTO switch.
b. Display should indicate AUTO.
Confirm that the compressor clutch engages (audio or visual
inspection).
(Discharge air and blower speed will depend on ambient,
in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for A/C system (HA-
2045).
If OK, continue with next check.
Then if necessary, go to trouble diagnosis procedure for magnet
clutch (HA-2068).
7. Check FRESH switch
a. Press FRE switch.
FRESH indicator should illuminate.
b. Listen for intake door position change. (You should hear a
slight change in blower sound.)
If NG, go to trouble diagnosis procedure for intake door motor
(HA-2060).
If OK, continue with next check.
8. Check A/C switch
a. Press A/C switch.
A/C indicator should illuminate.
b. Confirm that the compressor clutch is engaged.
If NG, go to trouble diagnosis procedure for A/C system (HA-
2045).
If OK, continue with next check.
If all operational check are OK (symptom cannot be duplicated),
go to ªIncident Simulation Testº (GI section) and perform test as
outlined to simulated driving conditions environment. If symptom
appear, refer to ªSYMPTOM TABLEº (HA-2040) and perform
applicable trouble diagnosis procedures.
RHA523G
RHA524G
RHA525G
TROUBLE DIAGNOSESAUTO
Operational Check (Cont'd)
HA-2044