2003 NISSAN TEANA Power

ATC-44
TROUBLE DIAGNOSIS

Auto Amp. Terminals and Reference ValueBJS000FW
Measure voltage between each terminal and ground by referring ter-
minals and reference value for unified meter and A/C amp.
PIN CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUE FOR UNIFIED METER AND A/C AMP.
RJIA2732E
RJIA2734E
Te r m i n a l
No.Wire
colorItemIgnition
switchConditionVoltag e
(V)
1 L CAN-H — — —
11 P C A N - L — — —
21 Y/R Power supply from BATT OFF — Battery voltage
22 G Power supply from IGN ON — Battery voltage
29 B Ground (Power) ON — Approx. 0
30 B Ground ON — Approx. 0
35 V Power supply from ACC ACC — Battery voltage
39 O/B Ambient sensor — — —
40 LG In-vehicle sensor — — —
41 R/W Intake sensor — — —
42 SB Compressor ON signal ONA/C switch: ON (Blower motor
operates.)Approx. 0
OFF switch: ON (A/C System:
OFF)
43 L/R A/C LAN signal ON —
SJIA1423J
SJIA1453J

TROUBLE DIAGNOSIS
ATC-45
C
D
E
F
G
H
I
K
L
MA
B
AT C

46 W/L Power supply from IGN 2 ON — Battery voltage
47 L/RBlower fan motor feedback
signalON Fan speed: 1st speed Approx. 8
49 B/Y Sensor ground ON — Approx. 0
50 O Sunload sensor — — —
54 L/WPower supply for each door
motorON — Battery voltage
57 BR/W FAN ON signal ONAUTO switch: ON (Blower
motor operates.)Approx. 0
AUTO switch: OFF Approx. 5
60 L/YBlower fan motor control sig-
nalONFan speed: 1st - 4th speed Approx. 2.5 - 3.5
Fan speed: 5th speed Approx. 9.5 - 10.5 Terminal
No.Wire
colorItemIgnition
switchConditionVoltage
(V)

TROUBLE DIAGNOSIS
ATC-55
C
D
E
F
G
H
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K
L
MA
B
AT C

CHECKING TEMPERATURE INCREASE
1. Press temperature control switch (UP, driver side) until 32°C is displayed.
2. Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for AT C - 9 1 , "
Insufficient Heating" .
If OK, continue the check.
CHECKING A/C SWITCH
1. Press AUTO switch and A/C switch.
2. A/C switch indicator will turn ON.

Confirm that the compressor clutch engages (sound or visual inspection).
If NG, go to trouble diagnosis procedure for AT C - 7 8 , "
Magnet Clutch Circuit" .
If OK, continue the check.
CHECKING AUTO MODE
1. Press AUTO switch and A/C switch.
2. Display should indicate AUTO.

Confirm that the compressor clutch engages (sound 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 AT C - 5 6 , "
Power Supply and Ground Circuit for Auto Amp." , then
if necessary, trouble diagnosis procedure for AT C - 7 8 , "
Magnet Clutch Circuit" .
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-24,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to AT C - 3 5 , "
SYMPTOM TABLE" and perform applica-
ble trouble diagnosis procedures.

ATC-56
TROUBLE DIAGNOSIS

Power Supply and Ground Circuit for Auto Amp.BJS000FZ
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
*1ATC-57, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2ATC-54, "Operational Check"*3AV-58, "Unable to Operate System
with A/C and AV Switch" (Integrated
display system)
*4AV-97, "
Unable to Operate System
with A/C and AV Switch" (Integrated
color display system)
PJIA0004E

ATC-58
TROUBLE DIAGNOSIS

1. CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Disconnect unified meter and A/C amp. connector.
2. Check voltage between unified meter and A/C amp. harness
connector M42 terminals 21, 22 and 35, unified meter and A/C
amp. harness connector M45 terminal 46 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check 10A and 15A fuses [Nos. 6, 10, 11, 12 and 19, located in the fuse block (J/B)]. Refer to PG-
79, "FUSE BLOCK - JUNCTION BOX (J/B)" .

If fuses are OK, check harness for open circuit. Repair or replace if necessary.

If fuses are NG, harness for short circuit and replace fuse.
2. CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Check continuity between unified meter and A/C amp. harness
connector M42 terminal 29, 30 and ground.
OK or NG
OK >> Replace unified meter and A/C amp.
NG >> Repair harness or connector.
Terminals Ignition switch position
(+)
(-) OFF ACC ON Unified
meter and
A/C amp.
connectorTerminal No.
M42 21
GroundBattery volt-
ageBattery volt-
ageBattery
voltage
M42 22 Approx. 0 V Approx. 0 VBattery
voltage
M42 35 Approx. 0 VBattery volt-
ageBattery
voltage
M45 46 Approx. 0 V Approx. 0 VBattery
voltage
RJIA1984E
29, 30 – Ground : Continuity should exist.
RJIA1985E

TROUBLE DIAGNOSIS
ATC-59
C
D
E
F
G
H
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K
L
MA
B
AT C

LAN System CircuitBJS000G0
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT
1. CHECK POWER SUPPLY FOR UNIFIED METER AND A/C AMP.
1. Turn ignition switch ON.
2. Check voltage between unified meter and A/C amp. harness
connector M45 terminal 54 and ground.
OK or NG
OK >> GO TO 2.
NG >> Replace unified meter and A/C amp.
2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M45 terminal 43 and ground using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace unified meter and A/C amp.
RJIA1775E
54 – Ground : Battery voltage
RJIA1986E
Terminals
Voltag e (+)
(-) Unified meter
and A/C amp.
connectorTe r m i n a l N o .
M45 43 Ground
RJIA1987E
SJIA1453J

ATC-60
TROUBLE DIAGNOSIS

3. CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between each door motor harness connector M252,
M253, M254 and M255 terminal 1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between each door motor harness connector
M252, M253, M254 and M255 terminal 2 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.1 – Ground : Battery voltage
RJIA1988E
Door
motorTe r m i n a l s
Voltage (+)
(-)
Con-
nectorTerminal
No.
Mode M252 3
Ground Air mix
(Driver
side)M253 3
Air mix
(Passen-
ger side)M254 3
Intake M255 3
RJIA1989E
SJIA1453J
2 – Ground : Continuity should exist.
RJIA1990E

TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
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MA
B
AT C

1. CHECK POWER SUPPLY FOR BLOWER MOTOR
1. Disconnect blower motor connector.
2. Turn ignition switch ON.
3. Check voltage between blower motor harness connector M48
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> Check power supply circuit and 15A fuses [Nos. 10 and
11, located in the fuse block (J/B)]. Refer to PG-79,
"FUSE BLOCK - JUNCTION BOX (J/B)" .

If fuses are OK, check harness for open circuit. Repair or replace if necessary.

If fuses are NG, check harness for short circuit and replace fuse.
2. CHECK FAN FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Reconnect blower motor connector.
3. Turn ignition switch ON.
4. Check voltage between unified meter and A/C amp. harness
connector M45 terminal 47 and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 9.
3. CHECK BLOWER MOTOR
Check blower motor. Refer to AT C - 7 7 , "
Blower Motor" .
OK or NG
OK >> GO TO 4.
NG >> Replace blower motor.
4. CHECK POWER SUPPLY FOR FAN CONTROL AMP.
1. Turn ignition switch ON.
2. Check voltage between fan control amp. harness connector
M86 terminal 3 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.1 – Ground : Battery voltage
RJIA2860E
47 – Ground : Battery voltage.
RJIA3266E
Terminals
Condition Voltage (+)
(−)
Fan control
amp. connectorTe r m i n a l N o .
M86 3 GroundFan speed: 1st
speedApprox. 8 V
RJIA2862E