2003 NISSAN TEANA light

ATC-50
TROUBLE DIAGNOSIS

12. CHECK CAN COMMUNICATION ERROR
1. Press intake switch.
2. CAN communication error between the unified meter and A/C
amp. and the display unit or display control unit can be detected
as self-diagnosis results. (If plural errors occur, the display of
each error will blink twice for 0-5 second intervals.) .
OK or NG
OK >> 1. Turn ignition switch OFF or AUTO switch ON.
2. INSPECTION END
NG >> Go to CAN communication. Refer to LAN-49, "
CAN Sys-
tem Specification Chart" .

Unified meter and A/C amp. - Display unit or Display
control unit.
13. CHECK MALFUNCTIONING SENSOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 will indicate
despite that sunload sensor is functioning properly.
*2: AT C - 9 6 , "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: ATC-100, "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: ATC-105, "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*5: ATC-102, "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*6: AT C - 6 8 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
RJIA1762E
Code No. Malfunctioning sensor (Including circuits) Reference page
21 / −21 Ambient sensor *2
22 / −22 In-vehicle sensor *3
24 / −24 Intake sensor *4
25 / −25
Sunload sensor
*1*5
26 / −26 Air mix door motor PBR (Driver side)
*6
27 / −27 Air mix door motor PBR (Passenger side)
PJIA0022E

ATC-54
TROUBLE DIAGNOSIS

Operational CheckBJS000FY
The purpose of the operational check is to confirm that the system operates properly.
CHECKING MEMORY FUNCTION
1. Press temperature control switch (UP, driver side) until 32°C is displayed.
2. Press fan control switch (DOWN) at least 2 seconds.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press fan control switch (DOWN) at least 2 seconds.
If NG, go to trouble diagnosis procedure for AT C - 9 5 , "
Memory Function" .
If OK, continue the check.
CHECKING BLOWER
1. Press fan control switch (UP). Blower should operate on low speed. The fan symbol should have one
blade lit.
2. Press fan control switch (UP) again, and continue checking blower speed and fan symbol until all speeds
are checked.
3. Leave blower on max. speed.
If NG, go to trouble diagnosis procedure for AT C - 7 2 , "
Blower Motor Circuit" .
If OK, continue the check.
CHECKING DISCHARGE AIR
1. Press MODE switch and DEF switch.
2. Each position indicator should change shape.
3. Confirm that discharge air comes out according to the air distri-
bution table. Refer to AT C - 3 1 , "
Discharge Air Flow" .
If NG, go to trouble diagnosis procedure for AT C - 6 3 , "
Mode Door
Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual
inspection) and intake door position is at FRESH when the DEF is
selected.
CHECKING INTAKE AIR
1. Press intake switch. Recirculation indicator should illuminate.
2. Press intake switch again. Fresh indicator should illuminate.
3. Listen for intake door position change (Slight change of blower sound can be heard.).
If NG, go to trouble diagnosis procedure for AT C - 6 9 , "
Intake Door Motor Circuit" .
If OK, continue the check.
NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at
FRESH when the DEF is selected.
CHECKING TEMPERATURE DECREASE
1. Press temperature control switch (DOWN, driver side) until 18°C is displayed.
2. Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 8 4 , "
Insufficient Cooling" .
If OK, continue the check.Conditions : Engine running at normal operating temperature
SJIA1002E

TROUBLE DIAGNOSIS
ATC-89
C
D
E
F
G
H
I
K
L
MA
B
AT C

High-pressure Side is Too Low and Low-pressure Side is Too High
Both High- and Low-pressure Sides are Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too low and
low-pressure side is too high.High- and low-pressure sides
become equal soon after com-
pressor operation stops.Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.Replace compressor.
No temperature difference
between high- and low-pres-
sure sides.Compressor pressure opera-
tion is improper.
↓
Damaged inside compressor
packings.Replace compressor.
AC356A
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too low.

There is a big temperature
difference between liquid
tank outlet and inlet. Outlet
temperature is extremely
low.

Liquid tank inlet and expan-
sion valve are frosted.Liquid tank inside is slightly
clogged.

Replace liquid tank.

Check lubricant for contami-
nation.

Temperature of expansion
valve inlet is extremely low
as compared with areas
near liquid tank.

Expansion valve inlet may
be frosted.

Temperature difference
occurs somewhere in high-
pressure side.High-pressure pipe located
between liquid tank and
expansion valve is clogged.

Check and repair malfunc-
tioning parts.

Check lubricant for contami-
nation.
Expansion valve and liquid
tank are warm or slightly cool
when touched.Low refrigerant charge.
↓
Leaking fittings or compo-
nents.Check refrigerant for leaks.
Refer to ATC-146, "
Checking
for Refrigerant Leaks" .
There is a big temperature dif-
ference between expansion
valve inlet and outlet while the
valve itself is frosted.Expansion valve closes a little
compared with the specifica-
tion.
↓
1. Improper expansion valve
adjustment
2. Malfunctioning expansion
valve.
3. Outlet and inlet may be
clogged.

Remove foreign particles by
using compressed air.

Replace expansion valve.

Check lubricant for contami-
nation.
An area of the low-pressure
pipe is colder than areas near
the evaporator outlet.Low-pressure pipe is clogged
or crushed.

Check and repair malfunc-
tioning parts.

Check lubricant for contami-
nation.
Air flow volume is not enough
or is too low.Evaporator is frozen.

Check intake sensor circuit.
Refer to ATC-105, "
Intake
Sensor Circuit" .

Replace compressor.

Repair evaporator fins.

Replace evaporator.

Refer to AT C - 7 2 , "Blower
Motor Circuit" .
AC353A

ATC-102
TROUBLE DIAGNOSIS

Sunload Sensor CircuitBJS000GE
COMPONENT DESCRIPTION
Sunload Sensor
The sunload sensor is located on the passenger side defroster grille.
It detects sunload entering through windshield by means of a photo
diode. The sensor converts the sunload into a current value which is
then input into the unified meter and A/C amp.
SUNLOAD INPUT PROCESS
The unified meter and A/C amp. also includes a processing circuit which averages the variations in detected
sunload over a period of time. This prevents drastic swings in the ATC system operation due to small or quick
variations in detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sunload sensor will vary whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sunload, and the system will react accord-
ingly.
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR
SYMPTOM: Sunload sensor circuit is open or shorted. (25 or −25 is
indicated on unified meter and A/C amp. as a result of performing
self-diagnosis STEP-2.)
1. CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND
1. Disconnect sunload sensor connector.
2. Turn ignition switch ON.
3. Check voltage between sunload sensor harness connector M61
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
RJIA3279E
RJIA1455E
1 – Ground : Approx. 5 V
RJIA2027E

ATC-146
REFRIGERANT LINES

Checking for Refrigerant LeaksBJS000JF
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant
leakage, damage and corrosion. A/C lubricant leakage may indicate an area of refrigerant leakage. Allow
extra inspection time in these areas when using either an electrical leak detector or fluorescent dye leak
detector (SST: J-42220).
If dye is observed, confirm the leak with an electrical leak detector. It is possible a prior leak was repaired and
not properly cleaned.
When searching for leaks, do not stop when one leak is found but continue to check for additional leaks at all
system components and connections.
When searching for refrigerant leaks using an electrical leak detector, move the probe along the suspected
leak area at 1 to 2 inches per second and no further than 1/4 inch from the component.
CAUTION:
Moving the electrical leak detector probe slower and closer to the suspected leak area will improve the
chances of finding a leak.
Checking System for Leaks Using the Fluorescent Leak DetectorBJS000JG
1. Check A/C system for leaks using the UV lamp and safety goggles (SST: J-42220) in a low sunlight area
(area without windows preferable). Illuminate all components, fittings and lines. The dye will appear as a
bright green/yellow area at the point of leakage. Fluorescent dye observed at the evaporator drain open-
ing indicates an evaporator core assembly (tubes, core or expansion valve) leak.
2. If the suspected area is difficult to see, use an adjustable mirror or wipe the area with a clean shop rag or
cloth, with the UV lamp for dye residue.
3. After the leak is repaired, remove any residual dye using dye cleaner (SST: J-43872) to prevent future
misdiagnosis.
4. Perform a system performance check and verify the leak repair with an approved electrical leak detector.
NOTE:
Other gases in the work area or substances on the A/C components, for example, anti-freeze, windshield
washer fluid, solvents and lubricants, may falsely trigger the leak detector. Make sure the surfaces to be
checked are clean.
Clean with a dry cloth or blow off with shop air.
Do not allow the sensor tip of the detector to contact with any substance. This can also cause false readings
and may damage the detector.
Dye InjectionBJS000JH
(This procedure is only necessary when recharging the system or when the compressor has seized and was
replaced.)
1. Check A/C system static (at rest) pressure. Pressure must be at least 345 kPa (3.45 bar, 3.52 kg/cm
2 , 50
psi).
2. Pour one bottle (1/4 ounce / 7.4 cc) of the A/C refrigerant dye into the injector tool (SST: J-41459).
3. Connect the injector tool to the A/C low-pressure side service valve.
4. Start engine and switch A/C ON.
5. When the A/C operating (compressor running), inject one bottle (1/4 ounce / 7.4 cc) of fluorescent dye
through the low-pressure service valve using dye injector tool (SST: J-41459) (refer to the manufacture's
operating instructions).
6. With the engine still running, disconnect the injector tool from the service valve.
CAUTION:
Be careful the A/C system or replacing a component, pour the dye directly into the open system
connection and proceed with the service procedures.
7. Operate the A/C system for a minimum of 20 minutes to mix the dye with the system oil. Depending on the
leak size, operating conditions and location of the leak, it may take from minutes to days for the dye to
penetrate a leak and become visible.
8. Attach a blue label as necessary.

AV-52
INTEGRATED DISPLAY SYSTEM

Terminals and Reference Value for Display UnitBKS00226
Te r m i n a l
(Wire color)
ItemSignal
input/
outputCondition
Reference value
+–Ignition
switchOperation
1 (Y) Ground Battery power supply Input OFF — Battery voltage
2 (V) Ground ACC power supply Input ACC — Battery voltage
3 (G) Ground Ignition signal Input ON — Battery voltage
4 (R/L) Ground Illumination signal Input ONLighting switch ON Approx. 12 V
Lighting switch OFF Approx. 0 V
6 (B) Ground Ground — ON — Approx. 0 V
7 (V/W) GroundVehicle speed signal
(8-pulse)Input ONWhen vehicle speed is
approx. 40 km/h (25 MPH)NOTE:
Maximum voltage may be 5 V
due to specifications (connected
units).
8 (G) GroundCommunication signal
(DSP-AUD)Output ONOperate audio volume
switch
9 — Shield — — — —
10 (Y) GroundCommunication signal
(AUD-DSP)Input ONOperate audio volume
switch
11 (BR) GroundCommunication
signal (+)Input/
OutputON —
12 — Shield — — — —
13 (Y) GroundCommunication
signal (–)Input/
OutputON —
14 (L) — CAN-H — — — —
16 (P) — CAN-L — — — —
PKIA1935E
SKIB3607E
SKIB3606E
SKIB7378E
SKIB7379E

INTEGRATED DISPLAY SYSTEM
AV-57
C
D
E
F
G
H
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MA
B
AV

Symptom ChartBKS0022B
Symptom Check item
All images are not displayed.

Display unit power supply and ground circuit

Display unit
Screen does not switch to nighttime mode after the
lighting switch is turned ON.

Display unit Illumination signal circuit

Display unit
TRIP and FUEL ECON screen do not appear.

Display unit ignition signal circuit

Display unit

Trip odometer (DIST) indication is malfunction-
ing.

Average vehicle speed (AVG) indication is mal-
functioning.

Vehicle speed signal circuit between unified meter and A/C amp. and display
unit

Display unit

Unified meter and A/C amp.
Average fuel consumption (AVG) indication is mal-
functioning.

Vehicle speed signal circuit between unified meter and A/C amp. and display
unit

CAN communication signal circuit
NOTE:
Diagnosis Procedure
Connect CONSULT-II. Select “METER A/C AMP”, and then, select “SELF-
DIAG RESULTS”. Check that “CAN COMM CIRC [U1000]” is indicated as the
diagnosis result. The communication with the unified meter and A/C amp. is
normal if not indicated. Repair the root cause if indicated. Refer to DI-32, "
DTC
[U1000] CAN Communication Circuit" .

Display unit

Unified meter and A/C amp.
Distance to empty (DTE) indication is malfunction-
ing.

CAN communication signal circuit
NOTE:
Diagnosis Procedure
Connect CONSULT-II. Select “METER A/C AMP”, and then, select “SELF-
DIAG RESULTS”. Check that “CAN COMM CIRC [U1000]” is indicated as the
diagnosis result. The communication with the unified meter and A/C amp. is
normal if not indicated. Repair the root cause if indicated. Refer to DI-32, "
DTC
[U1000] CAN Communication Circuit" .

Display unit

Unified meter and A/C amp.
Unable to operate system with A/C and AV switch. Refer to AV- 5 8 , "
Unable to Operate System with A/C and AV Switch"

INTEGRATED COLOR DISPLAY SYSTEM
AV-77
C
D
E
F
G
H
I
J
L
MA
B
AV

Terminals and Reference Value for Display Control UnitBKS0027R
Terminal
(Wire color)
ItemSignal
input/
outputCondition
Reference value
+–Ignition
switchOperation
1 (Y) Ground Battery power supply Input OFF — Battery voltage
2 (L/B) GroundPower supply
(Inverter) Output ON — Approx. 9 V
3 (B) Ground Ground — ON — Approx. 0 V
4 (L/Y) Ground Power supply (Signal) Output ON — Approx. 9 V
5 (P) Ground Ground (Inverter) — ON — Approx. 0 V
6 (G/W) Ground Reverse signal Input ONSelector lever in R position Approx. 12 V
Selector lever except in R
positionApprox. 0 V
7 (R/W) Ground Ground (Signal) — ON — Approx. 0 V
8 (BR/W) GroundCamera-connection
recognition signalInput ONConnected to rear view
camera control unit connec-
torApprox. 0 V
Not connected to rear view
camera control unit connec-
torApprox. 5 V
10 (V) Ground ACC power supply Input ACC — Battery voltage
12 (G) Ground Ignition signal Input ON — Battery voltage
14 (R/L) Ground Illumination signal Input ONLighting switch ON Approx. 12 V
Lighting switch OFF Approx. 0 V
16 (V/W) GroundVehicle speed signal
(8-pulse)Input ONWhen vehicle speed is
approx. 40 km/h (25 MPH)NOTE:
Maximum voltage may be 5 V
due to specifications (connected
units).
25 (L) — CAN-H — — — —
26 (P) — CAN-L — — — —
28 (BR) GroundCommunication
signal (+)Input/
OutputON —
29 — Shield — — — —
30 (Y) GroundCommunication
signal (–)Input/
OutputON —
PKIA1935E
SKIB7378E
SKIB7379E