2004 INFINITI QX56 air conditioner

ATC-28
AIR CONDITIONER CONTROL
Revision: August 20072004 QX56
Rear Air Control
REAR TEMPERATURE/MODE DIAL (REAR)
Increases or decreases the rear zone temperature and adjusts the mode simultaneously. FLOOR is full hot
setting, FLOOR/PANEL is warm setting, and PANEL is full cold setting. Operates only with rear fan switch
(front) is in the (R) position.
REAR FAN CONTROL SWITCH (REAR)
When the rear fan switch (front) is in the (R) position, it allows the rear fan switch (rear) to control the blower
motor speed. In any other position (1-4), the rear fan switch (front) controls the rear blower motor speed
regardless of the rear fan switch (rear) position.
LJIA0024E

AIR CONDITIONER CONTROL
ATC-29
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
Discharge Air FlowEJS002C0
FRONT
REAR
WJIA0540E
WJIA0528E
WJIA0541E
WJIA0893E

ATC-30
AIR CONDITIONER CONTROL
Revision: August 20072004 QX56
System Description (Front)EJS002C1
CONTROLS AND THEIR FUNCTIONS
WJIA1680E
WJIA0757E

AIR CONDITIONER CONTROL
ATC-31
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
System Description (Rear)EJS002C2
CONTROLS AND THEIR FUNCTIONS
WJIA0623E
WJIA0758E

ATC-32
AIR CONDITIONER CONTROL
Revision: August 20072004 QX56
CAN Communication System DescriptionEJS002C3
Refer to LAN-5, "CAN COMMUNICATION" .

ATC-34
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
DATA MONITOR
Operation Procedure
1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on
“DATA MONITOR” screen.
4. Touch “START”.
5. When “SELECTION FROM MENU” is selected, touch items to
be monitored. When “ALL SIGNALS” is selected, all the items
will be monitored.
6. Touch “RECORD” while monitoring, then the status of the moni-
tored item can be recorded. To stop recording, touch “STOP”.
Display Item List
WJIA0468E
BCIA0031E
All signals Monitors all the items.
Selection from menu Selects and monitors the individual item selected.
WJIA0469E
Monitor item name “operation or
unit”Contents
IGN ON SW “ON/OFF” Displays “IGN Position (ON)/OFF, ACC Position (OFF)” status as judged from ignition switch signal.
COMP ON SIG “ON/OFF” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
FAN ON SIG “ON/OFF” Displays “FAN (ON)/FAN (OFF)” status as judged from blower motor switch signal.

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
COMPONENT DESCRIPTION
Front Air Control
The front air control has a built-in microcomputer which processes
information sent from various sensors needed for air conditioner
operation. The air mix door motors, mode door motor, intake door
motor, defroster door motor, blower motor and compressor are then
controlled.
The front air control is unitized with control mechanisms. When the
various switches and temperature dials are operated, data is input to
the front air control.
Self-diagnostic functions are also built into the front air control to pro-
vide quick check of malfunctions in the auto air conditioner system.
Potentio Temperature Control (PTC)
There are two PTCs (passenger and driver) built into the front air
control. They can be set at an interval of 0.5°C (1.0°F) in the 18°C
(65°F) to 30°C (85°F) temperature range by rotating the temperature
dial. The set temperature is displayed.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
WJIA0759E
WJIA0413E
WJIA0414E

BCS-8
BCM (BODY CONTROL MODULE)
Revision: August 20072004 QX56
CAN Communication System DescriptionEKS007GF
Refer to LAN-5, "CAN COMMUNICATION" .
Power supply (BAT) to power window and
sunroofBattery power supply Power supply to power window and sunroof system
Panic alarm

Key switch

KeyfobIPDM E/R
Auto light system

Auto light sensor

Combination switchIPDM E/R
Battery saver control

Ignition switch

Combination switch

Front door switch LH

Front door switch RHIPDM E/R
Headlamp Combination switch IPDM E/R
Tail lamp Combination switch IPDM E/R
Fog lamp Combination switch IPDM E/R
Turn signal lamp Combination switch

Turn signal lamp

Combination meter
Hazard lamp Hazard switch

Turn signal lamp

Combination meter
Room lamp timer

Key switch

Keyfob

Main power window and door
lock/unlock switch

Front door lock assembly LH
(key cylinder switch)

All door switchInterior room lamp
Key warning chime

Key switch

Front door switch LHCombination meter (warning buzzer)
Light warning chime

Combination switch

Key switch

Front door switch LHCombination meter (warning buzzer)
Vehicle-speed-sensing intermittent wiper

Combination switch

Combination meterIPDM E/R
Rear window defogger Rear window defogger switch IPDM E/R
Air conditioner switch signal Front air control ECM
Blower fan switch signal Front air control ECM
Low tire pressure warning system Remote keyless entry receiver

Combination meter

Display control unit
Trailer tow Combination switch Trailer turn signal lamp
Vehicle security system

Remote keyless entry receiver
(Keyfob)

Main power window and door
lock/unlock switch

Power window and door lock/
unlock switch RH

Front door lock assembly LH
(key cylinder switch)

All door switch

Glass hatch ajar switch

IPDM E/R

Security indicator lamp System Input Output