Nissan Maxima. Manual — part 748
HAC-168
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
POWER SUPPLY AND GROUND CIRCUIT
1. Disconnect the A/C display unit connector.
2. Turn ignition switch ON.
3. Check voltage between A/C display unit harness connector
M101 terminal 6 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the harnesses or connectors.
2.
CHECK GROUND CIRCUIT FOR A/C DISPLAY UNIT
1. Turn ignition switch OFF.
2. Check continuity between A/C display unit harness connector
M101 terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace the A/C display unit. Refer to
.
NO
>> Repair the harnesses or connectors.
6 - Ground
: Battery voltage
AWIIA1181ZZ
1 - Ground
: Continuity should exist
AWIIA1182ZZ
A/C AUTO AMP.
HAC-169
< ECU DIAGNOSIS INFORMATION >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
ECU DIAGNOSIS INFORMATION
A/C AUTO AMP.
Reference Value
INFOID:0000000010051174
VALUES ON THE DIAGNOSIS TOOL
CONSULT MONITOR ITEM
A/C AUTO AMP. HARNESS CONNECTOR TERMINAL LAYOUT
TERMINALS AND REFERENCE VALUES FOR A/C AUTO AMP.
Monitor item
Condition
Value/Status
COMP REQ SIG
Engine: Run at idle after
warming up
A/C switch: ON
(A/C compressor operation
status)
On
A/C switch: OFF
Off
FAN REQ SIG
Engine: Run at idle after
warming up
Blower fan: ON
On
Blower fan: OFF
Off
AMB TEMP SEN
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
IN-VEH TEMP
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
INT TEMP SEN
Ignition switch ON
—
22 - 131
°F (−30 - 55°C)
SUNLOAD SEN
Ignition switch ON
—
0 - 1395 w/m
2
(0 - 1200 kcal/m
2
·h)
AMB SEN CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
IN-VEH CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
INT TEMP CAL
Ignition switch ON
—
22 -131
°F (−30 - 55°C)
SUNL SEN CAL
Ignition switch ON
—
0 - 1395 w/m
2
(0 - 1200 kcal/m
2
·h)
FAN DUTY
Engine: Run at idle after
warming up
Blower fan: ON
25 - 85%
Blower fan: OFF
0%
XM
Ignition switch ON
—
−100 - 155
ENG COOL TEMP
Ignition switch ON
—
Values according to coolant
temperature
VEHICLE SPEED
Driving
—
Equivalent to speedometer
reading
AWIIA1381ZZ
Terminal
No.
Wire col-
or
Item
Ignition
switch
Condition
Value
(Approx.)
1
L
CAN-H
ON
—
0 - 5V
2
P
CAN-L
ON
—
0 - 5V
6
L
TX (AMP > SW DISP)
ON
—
0 - 5V
HAC-170
< ECU DIAGNOSIS INFORMATION >
[WITH MONOCHROME DISPLAY]
A/C AUTO AMP.
DTC Inspection Priority Chart
INFOID:0000000010051175
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
7
P
RX (SW > AMP)
ON
—
0 - 5V
10
L/R
LAN signal
ON
—
11
L/W
Power supply for each door motor
ON
—
Battery voltage
15
O
Sunload sensor
ON
—
0 - 5V
16
R/G
Intake sensor
ON
—
0 - 5V
17
V/Y
Power supply from ACC
ACC
—
Battery voltage
19
B
Ground
ON
—
0V
20
G
Power supply from IGN
ON
—
Battery voltage
27
GR/W
Rear defrost ON signal
ON
Defroster
switch ON
0V
Defroster
switch OFF
Battery voltage
32
L/Y
Blower motor control signal
ON
Fan
speed:1st
speed
(manual)
35
O/B
Ambient sensor
ON
—
0 - 5V
36
LG
In-vehicle sensor
ON
—
0 - 5V
37
B/Y
Sensor ground
—
—
0V
39
B
Ground
—
—
0V
40
Y/R
Power supply from BATT
—
—
Battery voltage
Terminal
No.
Wire col-
or
Item
Ignition
switch
Condition
Value
(Approx.)
SJIA1453J
JSIIA0096ZZ
A/C AUTO AMP.
HAC-171
< ECU DIAGNOSIS INFORMATION >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
DTC Index
INFOID:0000000010051176
Priority
Detected items (DTC)
1
• U1000: CAN COMM CIRCUIT
• U1010: CONTROL UNIT (CAN)
2
• B257B: AMB TEMP SEN (SHORT)
• B257C: AMB TEMP SEN (OPEN)
• B2578: IN CAR SENSOR (OUT OF RANGE[LOW])
• B2579: IN CAR SENSOR (OUT OF RANGE[HI])
• B2581: EVAP TEMP SEN (SHORT)
• B2582: EVAP TEMP SEN (OPEN)
• B2630: SUNLOAD SEN (SHORT)
• B2631: SUNLOAD SEN (OPEN)
• B2632: DR AIRMIX ACTR (SHORT)
• B2633: DR AIRMIX ACTR (OPEN)
• B2634: PASS AIRMIX ACTR (SHORT)
• B2635: PASS AIRMIX ACTR (OPEN)
• B2636: DR VENT DOOR FAIL
• B2637: DR B/L DOOR FAIL
• B2638: DR D/F1 DOOR FAIL
• B2639: DR DEF DOOR FAIL
• B263D: FRE DOOR FAIL
• B263E: 20P FRE DOOR FAIL
• B263F: REC DOOR FAIL
• B2654: D/F2 DOOR FAIL
• B2655: B/L2 DOOR FAIL
DTC
Items
(CONSULT screen terms)
Reference
U1000
CAN COMM CIRCUIT
U1010
CONTROL UNIT (CAN)
B257B
AMB TEMP SEN (SHORT)
B257C
AMB TEMP SEN (OPEN)
B2578
IN CAR SENSOR (OUT OF RANGE [LOW])
B2579
IN CAR SENSOR (OUT OF RANGE [HI])
B2581
EVAP TEMP SEN (SHORT)
B2582
EVAP TEMP SEN (OPEN)
B2630
*
SUNLOAD SEN (SHORT)
B2631
*
SUNLOAD SEN (OPEN)
B2632
DR AIRMIX ACTR (SHORT)
B2633
DR AIRMIX ACTR (OPEN)
B2634
PASS AIRMIX ACTR (SHORT)
B2635
PASS AIRMIX ACTR (OPEN)
B2636
DR VENT DOOR FAIL
B2637
DR B/L DOOR FAIL
B2638
DR D/F1 DOOR FAIL
B2639
DR DEF DOOR FAIL
B263D
FRE DOOR FAIL
B263E
20P FRE DOOR FAIL
B263F
REC DOOR FAIL
B2654
D/F2 DOOR FAIL
B2655
B/L2 DOOR FAIL
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