Nissan Pathfinder. Manual — part 695

DIAGNOSIS SYSTEM (HVAC)

HAC-41

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

WORK SUPPORT

NOTE:

When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V

or less, the setting of WORK SUPPORT may be cancelled.

RRFAN REQ SIG

[On/Off]

Displays rear blower motor ON/OFF status transmitted to other units via CAN communi-
cation.

RR FAN DUTY

Duty ratio of rear blower motor judged by A/C auto amp.

ENG COOL TEMP

[

°C (°F)] Engine coolant temperature signal value received from ECM via CAN communication.

VEHICLE SPEED

[km/h

(mph)]

Vehicle speed signal value received from combination meter via CAN communication.

TRI ZONE XM

Target discharge tri zone air temperature judged by A/C auto amp. depending on the
temperature setting and the value from each sensor.

BOOSTR FAN RQST SIGNAL

[On/Off]

Displays rear blower motor ON/OFF status transmitted to other units via CAN communi-
cation.

BOOSTER FAN DUTY

Duty ratio of rear blower motor judged by A/C auto amp.

Monitor item [Unit]

Description

Work item

Description

Refer to

REAR TEMP SET CORRECT

Setting change of temperature setting trimmer (rear) can be per-
formed.

HAC-78, "FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"

TEMP SET CORRECT

Setting change of temperature setting trimmer (front) can be per-
formed.

HAC-78, "FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM :
Temperature Setting Trim-
mer (Front)"

REC MEMORY SET

Setting change of inlet port memory function (REC) can be per-
formed.

HAC-79, "FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (REC)"

FRE MEMORY SET

Setting change of inlet port memory function (FRE) can be per-
formed.

HAC-79, "FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Inlet Port
Memory Function (FRE)"

BLOW SET

Setting change of foot position setting trimmer can be performed.

HAC-78, "FRONT AUTO-
MATIC AIR CONDITION-
ING SYSTEM : Foot
Position Setting Trimmer"

HAC-42

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

A/C AUTO AMP.

ECU DIAGNOSIS INFORMATION

A/C AUTO AMP.

Reference Value

INFOID:0000000009176802

VALUES ON THE DIAGNOSIS TOOL

Monitor item

Condition

Value/Status

AMB TEMP SEN

Ignition switch ON

—

Equivalent to ambient tem-
perature

IN-VEH TEMP

Ignition switch ON

—

Equivalent to in-vehicle tem-
perature (front side)

INT TEMP SEN

Ignition switch ON

—

Equivalent to front evapora-
tor fin temperature

SUNLOAD SEN

Ignition switch ON

—

Equivalent to sunload (driver
side)

AMB SEN CAL

Ignition switch ON

—

Equivalent to ambient tem-
perature

IN-VEH CAL

Ignition switch ON

—

Equivalent to in-vehicle tem-
perature (front side)

INT TEMP CAL

Ignition switch ON

—

Equivalent to front evapora-
tor fin temperature

SUNL SEN CAL

Ignition switch ON

—

Equivalent to sunload (driver
side)

COMP REQ SIG

Engine: Run at idle after
warming up

A/C switch: ON
(Compressor operation sta-
tus)

On

A/C switch: OFF

Off

FAN REQ SIG

Engine: Run at idle after
warming up

Front blower motor: ON

On

Front blower motor: OFF

Off

FAN DUTY

Engine: Run at idle after
warming up

Front blower motor: ON

25 – 81

Front blower motor: OFF

0

XM

Ignition switch ON

—

Value according to target air
flow temperature (driver
side)

RR XM

Ignition switch ON

—

Value according to target air
flow temperature (rear side)

PA TARGET A/TEMP

Ignition switch ON

—

Value according to target air
flow temperature (passen-
ger side)

RRFAN REQ SIG

Engine: Run at idle after
warming up

Rear blower motor: ON

On

Rear blower motor: OFF

Off

RR FAN DUTY

Engine: Run at idle after
warming up

Rear blower motor: ON

25 – 81

Rear blower motor: OFF

0

ENG COOL TEMP

Ignition switch ON

—

Equivalent to engine coolant
temperature

VEHICLE SPEED

Driving

—

Equivalent to speedometer
reading

TRI ZONE XM

Ignition switch ON

—

Value according to target air
flow temperature (rear side)

BOOSTR FAN RQST SIGNAL

Engine: Run at idle after
warming up

Rear blower motor: ON

On

Rear blower motor: OFF

Off

A/C AUTO AMP.

HAC-43

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

TERMINAL LAYOUT

PHYSICAL VALUES

BOOSTER FAN DUTY

Engine: Run at idle after
warming up

Rear blower motor: ON

25 – 81

Rear blower motor: OFF

0

Monitor item

Condition

Value/Status

ALIIA0579ZZ

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

1

(L)

—

CAN-H

Input/

Output

—

—

2

(GR)

—

Ground

—

—

—

3

(G)

Ground

Battery power supply

Input

Ignition switch OFF

Battery voltage

4

(W)

Ground

Communication signal
(A/C auto amp.

→A/C switch

assembly)

Output

Ignition switch ON

5

(G)

Ground

Communication signal
(A/C auto amp.

→Rear air

control)

Output

Ignition switch ON

7

(G)

Ground

Ambient sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with ambient

temperature

8

*1

(G)

Ground

Heated steering wheel
switch signal

Input

Ignition
switch
ON

Heated steer-
ing wheel
switch: While
pressing

0 V

Other than the
above

Battery voltage

9

(W)

Ground

Sunload sensor signal

Input

Ignition switch ON

0 – 4.8 V

Output voltage varies with sunload

amount

SJIA1521J

SJIA1521J

HAC-44

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONING]

A/C AUTO AMP.

12

(G)

Ground

Fan control amp. control sig-
nal

Output

• Ignition switch ON
• Blower speed: OFF

0 V

• Ignition switch ON
• Blower speed: 1st - 23rd

2.5 - 3.5 V

• Ignition switch ON
• Blower speed: 24th -

25th

10 V

13

(W)

Ground

IGN 2

Input

Ignition switch ON

Battery voltage

14

(W)

Ground

Fan control amp. control sig-
nal

Output

• Ignition switch ON
• Blower speed: OFF

0 V

• Ignition switch ON
• Blower speed: 1st - 23rd

2.5 - 3.5 V

• Ignition switch ON
• Blower speed: 24th -

25th

10 V

15

(R)

Ground

Rear window defogger
switch

Output

Ignition
switch
ON

ON

0 V

OFF

5 V

16

(Y)

Ground

Each door motor LIN signal

Input/

Output

Ignition switch ON

17

(LG)

Ground

Each door motor power sup-
ply

Output

Ignition switch ON

Battery voltage

18

(W)

Ground

Front blower motor control
signal

Output

• Ignition switch ON
• Front fan speed: 1st

speed (manual)

19

(W)

Ground

PTC1 relay output signal

Input

Ignition
switch
ON

PTC heater:
ON

0 V

PTC heater:
OFF

Battery voltage

20

*1

(BR)

Ground

Heated steering wheel relay
control signal

Output

Ignition
switch
ON

Within 30 sec-
onds after
turning ON the
heated steer-
ing switch.

0 V

Other than the
above

Battery voltage

21

(P)

—

CAN-L

Input/

Output

—

—

22

(GR)

—

Ground

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/

Output

SJIA1453J

JSIIA0096ZZ